Experienced java developer jobs

As a growing business, we're seeking an experienced Swedish native who can provide phone support for our Customer Service department. The successful candidate should be: - Able to manage a workload of between 50 and 100 calls per day. - Possess strong understanding and knowledge in resolving customer issues promptly and pleasantly. Your primary responsibility would be to answer customer inquiries, resolve their issues, and provide a positive customer experience. Essential Skills: - Fluent in Swedish (native level) - Excellent communication and problem-solving skills - Previous experience in a customer service role, preferably in a call center environment. This role offers a fantastic opportunity to get involved in the early stages of our customer service expansion. If yo...

I'm in need of an experienced Linux programmer to update my current SMTP server code and add new routines. Key requirements: - Revise and improve the sending efficiency of the server - Add new functionalities to the existing code The ideal freelancer for this project should be well-versed in Linux programming and have a solid understanding of SMTP server architecture. Your proposal should include a detailed plan on how you aim to achieve the project requirements.

...and its operations. - I'll be offering a variety of donuts, coffee, and smoothies. A key expectation is for the freelancer to help incorporate these offerings seamlessly into the shop's workflow. - The target audience for this establishment is wide, catering to adults, children, and all age groups. It is important that the shop's design and services reflect this inclusivity. - I need someone experienced in the food retail industry, especially in setting up and running a donut shop. Knowledge of the local market and shopping mall culture is a big plus. - Design skills are also valuable as I'd like the freelancer to help in creating a welcoming and appealing atmosphere for the shop. - The ideal freelancer would have prior experience in food and beverage ventur...

I'm looking for an experienced Android app developer with strong front-end and back-end skills to develop an app based on my requirements. Specifically, the app should support in-app purchases and be compatible with all current Android versions. Key Requirements: - Develop front-end and back-end of the app - Implement in-app purchasing functionality - Ensure the app supports all current Android versions Data Management: - I prefer direct database access for content management - Utilizing third-party services for a more seamless and efficient data processing Ideal Skills: - Proven experience in Android app development - Proficiency in implementing in-app purchases - Strong understanding of both front-end and back-end development - Familiarity with managing data via dir...

I'm seeking a proficient C++ developer with ample experience to handle an update to our existing source code. You will be tasked with: Upgrading the source code to make use of the RandomX algorithm (no need to implement the algorithm, as we already have it ready and we will provide the source code), currently the source code is fully working with CryptoNight. Knowledge and experience with the CryptoNight or crypto coins are incredibly beneficial. You should be well-versed in updating and refining source codes.

I urgently need an experienced web scraper who can extract data efficiently from multiple websites. Applicants' guidelines are as follows: 1. Websites for Scraping: Due to security concerns, the websites to be scraped will only be shared with the selected freelancer. 2. Application Contents: I didn't explicitly mention what I want freelancers to include in their applications. However, demonstrating your skills, experience, and past work related to web scraping will surely be a significant advantage. 3. Project Deadline: I require this project to be completed as soon as possible. Please include your estimated completion date in your proposal. Ideal Skills & Experience: - Proven experience in web scraping - Knowledge of Python, Selenium or other scraping tools - Stro...

Job Description: I'm in need of an experienced Amazon Affiliate Store Manager to help me grow my store's profits. As the manager, you will be responsible for setting up, growing, and managing the store. The pay is $2 per hour and you will receive 20% off gross profits from the store. Responsibilities: Product Selection: Utilize your expertise to choose products or categories that maximize profit. Your ability to identify and promote high-converting products is crucial. Store Design: Create a visually appealing and user-friendly layout for the store. A clean and minimalistic design is preferred to align with the aesthetic. Traffic Generation: Manage and optimize Search Engine Optimization (SEO) strategies to drive consistent and quality traffic to the store. Ideal Skills ...

I require a skilled Java programmer to assist me with debugging a beginner-level program. Key aspects of the project: - Debugging: The main focus of this project is to help me fix basic syntax errors and runtime errors that I am encountering in my Java program. - Goal: The primary goal of this collaboration is to ensure that all identified bugs are fixed in the program. Ideal Freelancer: - Proficient in Java: The ideal candidate should have a strong understanding of Java programming, particularly when it comes to debugging and handling errors. - Patient and Detail-Oriented: As this is a beginner-level task, I am looking for someone who is patient and detail-oriented, to help me navigate through the debugging process.

We are a newly forming jewelry business seeking an experienced, results-oriented grant writer to help us secure $50,000 in startup funding. The successful candidate will research and identify relevant grant opportunities, craft compelling proposals, and work closely with our team to position our business for grant success. Responsibilities: * Research and identify grant opportunities aligned with our business plan and funding needs * Write clear, persuasive grant proposals and applications * Collaborate with our team to gather necessary information and data to support grant submissions * Manage grant submission process, including meeting all required deadlines * Communicate progress updates to management and incorporate feedback * Assist with post-award reporting and compliance as ...

I'm currently looking for a React developer with knowledge in the use for FiveM, I'm just looking for a single developer, not companies or teams. I need the developer to do the frontend and call the events as the are called in the FiveM Game.

I'm in need of a skilled developer to create an intelligent transaction monitoring platform with big data capabilities, specifically focusing on real-time monitoring and fraud detection. Key Features: - The system should support real-time monitoring of transaction data. - It should have fraud detection capabilities. - Data visualization to aid in tracking and analysis. - Analytics for evaluating transaction patterns and identifying potential issues. - Smooth Data Pipeline with Realtime streaming for efficient data handling. - API integration with third parties to ensure seamless operation. Target Audience: This platform is primarily aimed at banking and financial institutions, as well as e-commerce companies. Preferred Technology Stack: - Java & Python for the c...

I have 1 issue with socket.io-client. I developed the react-native project and tested it on Mac OS. I generated APK, but function is not working although that function is working well in Mac OS. If you have any experience, please let me know. Thanks

I'm looking for a React and developer that integrate a Partical background to our website ASAP. We found this interesting sample: Although it looks like Vanilla implementation, we want it to be integrated into our react landing page. We are looking for someone to integrate the background exactly as it is just without a loading spinner at the top of our landing page instead of the big blue banner on our website:

I'm in need of a professional who can take an image and render it into a realistic 3D model with rigging for animation purposes. This m...can take an image and render it into a realistic 3D model with rigging for animation purposes. This model should be created with the following specifics in mind: - Created specifically for animation. - The model should have a realistic appearance. - Compatibility with Blender is a must. The perfect candidate for this task would be well-versed in image rendering, animation programming, and experienced in using Blender for 3D model creation. They should have an excellent eye for details to ensure the model has a realistic vibe. The completed model should be ready for use in animations. Experience in making models for realistic animation would...

I'm seeking a proficient WordPress developer for my upcoming project. Here's a brief of the project: - I need a WordPress website that's user-friendly and functional. - The website should be optimized for performance and SEO. - You're expected to deliver a clean, well-commented code. Ideal skills and experience for this project: - Previous experience in WordPress development. - Familiarity with e-commerce and blogging functionality. - Proficiency in custom design is a plus. - Knowledge of SEO optimization. - Strong attention to detail and ability to deliver on time.

I'm looking for a seasoned Java developer who has experience working with XAMP. Your understanding of database systems is also crucial to this project's success. Please apply if you have the required expertise. No teams or companies please.

I'm looking to revamp my website to provide a better user experience and improve its overall performance. Key Changes: - **Design Update**: I want to change my websit...- **Design Update**: I want to change my website's color scheme and improve navigation. This might involve tweaking fonts, colors, and overall layout to create a more engaging and intuitive experience. - **Navigation Improvements**: I'm particularly interested in enhancing the mobile responsiveness and ensuring my bio is prominently displayed with a matching photograph. Ideal Freelancer: - Experienced web designer with a strong portfolio showcasing previous design and performance enhancements. - Proficiency in user experience and mobile responsiveness. - Familiarity with content management systems ...

We are looking for Norwegian Transcribers to transcribe Norwegian Audio to Norwegian. You must have good Internet and Laptop You should be able to work for 6-8 hours a day Work Description =============== 1. You will receive the time segmented audio files in the online portal 2. You will transcribe as you hear on each segments 3. You will be asked to follow transcription guidelines.

I'm in need of a skilled and experienced video editor to work on my social media content, to be shared on Instagram, TikTok, and YouTube. Key Requirements: - Create, edit and produce videos suitable for Instagram, TikTok, and YouTube - Craft content for different types of videos, specifically tutorial videos, vlogs, reels, and TikToks - Videos should be concise, engaging, and relevant to the platform they are intended for - Ability to maintain a consistent brand voice across all videos Ideal Skills and Experience: - Proven experience in creating engaging social media videos - Expertise in video editing software - Understanding of social media best practices - Familiarity with Instagram, TikTok, and YouTube's video format and style - Strong communication skills to unders...

...with my website that require a developer experienced in CodeIgniter and PHPMyAdmin to resolve. Additionally, I require some new functions to be added to my website's admin panel. Key Areas of Work: - Fixing Error Messages: The site is currently displaying error messages related to database connections and functionality. These need to be debugged and resolved. - Adding New Functions: I'm looking to enhance the admin panel with new features in the following areas: - User Management: I need a more robust user management system to be implemented. - Content Management: The content management system should be optimized for smoother operation. - Reporting and Analytics: I require better tools for analytics and reporting within the admin panel. Ideal Developer...

I am in need of a mid-level Java developer who can take on tasks in both backend and frontend development, along with database integration. Ideal Skills and Experience: - Strong background in Java - Proven experience in both backend and frontend development - Track record in effective database integration - Mid-level experience required Project Methodology: - The selected developer must be well acquainted with the Agile development methodology. Proficiency in Scrum management or Waterfall approaches is a plus, but the main focus is Agile. This project promises to be exciting and offers comprehensive exposure to diverse aspects of Java development. If your experience aligns with the requirements, and you're well-versed with Agile, I would love t...

I'm urgently seeking a skilled graphic designer to help expand my skill set. The project involves learning the basics of graphic design and I'm particularly interested in incorporating Java into my work. Key Requirements: - Proficiency in graphic design - Solid understanding of Java - Ability to provide clear, concise explanations for learning purposes The ideal freelancer for this project should have experience in both graphic design and Java. A background in teaching or tutoring could also be beneficial. I need someone who can effectively communicate complex technical information in a way that is easy to understand and apply. Please only apply if you can start immediately, as I'm looking to complete this project as soon as possible. I'm open t...

I am looking for an experienced Android developer to help with a couple of key issues in my app. The primary focus should be on UI improvements. Key Tasks: token refresh functionality ignore battery optimize permission run at startups functionality UI change 2 new api's refactor code for easier maintenance currently displayes persistent notification dont want it Other requirements: - The app's token refresh mechanism must be revised and optimized - You should be able to ignore battery optimization permission I would ideally like a freelancer who is experienced with Java, Android Studio and UI/UX principles. Experience with token refresh mechanisms and battery optimization is also highly desirable. Please provide examples of previous relevant wor...

I have a CS-Cart Multi-Vendor site that experienced a severe breakdown following a failed upgrade. This has led to a range of issues from broken layout to persistent error messages. Additionally, after the failed upgrade, the database is out of sync. The site needs urgent attention to get it back on track. Your primary role on this project will be: - Debug and fix the bad upgrade: This includes addressing the broken layout, error messages, and the out-of-sync database issue. - Server Configuration & Security Audit: Given that I've made changes to the server configuration and security settings post the failed upgrade, it's crucial to assess these modifications and ensure they're functioning optimally and not contributing to the site's issues. - Optimization...

I need a talented VB.net developer with a strong background in SQL Server. Key Responsibilities: - Develop software applications using VB.net - Efficiently manage databases - Designing, coding, testing, and debugging software applications using VB.NET. - Calling third-party API - Payment gateway integration - Stored Procedure Ideal Candidate: - Proven experience in VB.net development - Strong familiarity with SQL Server - Good problem-solving skills - Ability to work independently and meet deadlines. Please provide relevant work samples in VB.net development and describe your experience with SQL Server.

Our team is seeking a talented WordPress developer with specialization in theme customization, plugin development, and website maintenance to join us in bringing exciting websites to life. You will be involved in: - Collaborating on versatile and innovative projects - Utilizing your expertise to enhance our digital presence Ideal Skills: - Deep understanding of WordPress - Proficiency in Theme Customization - Experience in Plugin Development - Knowledge in Website Maintenance In your application, please include your past work. Examples demonstrating your proficiency in WordPress, theme customization, plugin development, and website maintenance are especially welcomed. We look forward to reviewing your contribution to this creative journey.

I'm in need of a skilled and experienced portrait painter who can create a commanding, large-scale oil painting (greater than 36 x 48 inches). Key Tasks: - Create a portrait focusing on capturing realism, character and depth - Utilize oil paint as the medium Ideal Skills: - Expertise in oil portrait painting - Proven experience with large-scale artwork - Eye for detail and realism - Can manage timelines and delivery of a large-scale canvas. Please provide a portfolio of relevant work with your bid. It will stand as a strong testament to your skill set aligning with the requirement.

I'm seeking an experienced Graphic Designer with a unique and modern flair to assist with my men's clothing line design. Key areas of focus: - Typography - Illustrations - Patterns The ideal freelancer will be someone with: - Expertise in creating designs for men's clothing - Proven experience in creating unique typography, illustrations, and patterns - A strong understanding and respect for designing with the target audience in mind. The goal is to create visually appealing and unique pieces that will resonate with the male demographic. Previous experience with designing for this specific audience will be highly beneficial.

I need a React developer for immediate collaboration. The primary focus will be on frontend development, with special emphasis on creating a basic user interface, involving simple forms and buttons. Skills Required: - Proven experience in React, with a strong portfolio of work in frontend development. - Ability to work quickly and efficiently, meeting an immediate project deadline. - Familiarity with integrating APIs into a project. The ideal candidate will have: - Strong communication skills as this is an immediate requirement. - Prior experience working on simple UI/UX design. - A keen eye for detail and the ability to follow design specifications accurately. Please include examples of your work with your proposal.

I am seeking a skilled developer to create a comprehensive beauty appointment booking application that will run on both Android, iOS, and the web. As the app will be for beauty appointments, it will require a specific set of features to cater to the needs of both the service providers and the clients. Key Features: - User Registration: Allow both service providers (beauty professionals) and customers to create accounts. - Search Functionality: Clients should be able to search for beauty professionals based on their services and availability. - Booking and Payment: Seamless booking and secure payment processing. - Calendar View for Schedule: A clear and organized view of the availability of service providers. - SMS Reminder: Automated reminders to reduce no-shows. - Partial Section ...

We need an experienced researcher, and PhD holders are preferred.

I'm seeking an experienced data scientist and analyst to support me in improving my business operations through a data-driven approach. The project will involve tackling tasks across data cleaning, statistical analysis, and data structuring and algorithm implementation. Ideal Skills and Experience: - Proficiency in data cleaning and preprocessing to ensure that the data is in its most usable, accurate, and complete state. - Strong statistical analysis and modeling skills to extract meaningful insights and make accurate predictions. - Excellent experience in structuring data and implementing algorithms that are tailored to business needs. Data Sources: - Social Media Data: You should be comfortable working with a variety of social media platforms to extract relevant data and i...

I am currently seeking a skilled influencer to market music to teenagers and young adults. We want to leverage an influencers audience t...the influencer to be present in the content as well. Key Responsibilities: * develop short performance clips and music video teasers on Facebook and Instagram to promote music to core demographic. Requirements: * Expertise in leveraging social media for marketing * Background in music/ promotion is an advantage * Strong understanding of content marketing to teenagers and young adults * Experienced in creating engaging content that will captivate our audience. Creativity and originality, along with a passion for music and a solid understanding of online promotion tactics are key for this role. Female pop artist /Ariana Grande type. (15 ...

I'm in need of an experienced architect or interior designer who can create a detailed renovation plan for my old waterfront home in Annapolis, Maryland. The property has gotten into a dilapidated state and I am looking to completely transform it into a modern style while preserving its coastal charm. Key Renovation Aspects - Interior Remodeling: The interior space of the house, which stands at 1300 sq ft, requires a full overhaul to bring it up to modern standards. This includes but is not limited to, flooring, walls, ceilings, and fixtures. - Exterior Painting: The exterior of the house will need a fresh coat of paint to restore it to its former glory and protect it against the elements. - Kitchen Renovation: A complete modernization of the kitchen is necessary to make the s...

I'm in need of a proficient developer to build me a simple QuickBooks online application. This application should be geared towards triggering real-time dispatch of event data on items/products inventory to a webhook like Zapier. Below are the specific requirements: - Dispatching of Item Names, Quantities, and Prices: The application should be able to send all item/product data particularly item names, quantities, and prices from QuickBooks to Zapier. - Real-Time Data Dispatch: The application should be able to dispatch this data in real-time to ensure high responsiveness and accuracy of data. Ideal skills and experience: - Demonstrable experience in creating QuickBooks integrations - Familiarity with Zapier webhooks - Knowledge of inventory data management - Strong coding s...

I'm in need of an experienced web developer to build a website for my business. While some details are still being finalized, I can share that the site will likely be an e-commerce platform. I am currently considering other options for the site's purpose however. The ideal freelancer will have extensive experience in website development, particularly with e-commerce platforms. I would also prefer someone who has a good understanding of UX/UI design principles as the site will need to be visually appealing and easy to navigate. Please submit your past work and any other relevant experience in your application.

I'm in search of an experienced developer skilled in Zendesk API integration for a project related to airline claim forms. I will provide you parts of the template and you will add the form, calculations, API integration and ticket creations. The website should be built in Laravel or secure platform. If you know about EC261 claims it makes it way easier to choose you. You will do the following: - Create a form which is predefined through parameters and questions. - Add airline and airport database and organize the data with live search preview. - Calculations based on airport distance and claim form. - Zendesk ticket creation along with correct ticket numer and relevant information. - Multilingual form and site (Swedish and English). Need someone to start ASAP.

I'm in need of a skilled Swift developer with experience in implementing in-app purchases in macOS applications. The application is already built and functioning, but I require assistance in adding a subscription-based in-app purchase feature. Key Requirements: - Have access to the Apple Developer Program and experience in submitting in-app purchase features to the Apple Store - Proficient in Swift, as the application is built using this language - Ability to implement subscription-based in-app purchases seamlessly - Experience in the development of macOS applications and complying with Apple Store guidelines Your responsibilities will include: - Implementing the subscription-based in-app purchase into the existing macOS application - Ensuring the in-app purchase featu...

I need a skilled PHP developer for a project that requires merging multiple images into a single template. The primary task is to overlay images on top of a template, creating a final image that is a combination of all the images. Key requirements include: - Merging multiple images: This project involves overlaying several images on top of each other to create a final composite image. - Positioning and Size: The ability to adjust the positioning and size of the images being overlaid is essential. While I prefer a simple drag and drop tool to adjust these parameters, the output should be precise. - Output Formats: The final image should be available in both JPEG and PNG formats. Ideal skills and experience for this job include: - Strong proficiency in PHP: Since this project will b...

I'm looking for a seasoned full stack developer with expertise in Flutter, React JS, and Node JS to build a comprehensive web application. The project will include, but not limited to: - Building a User authentication system - Implementing real-time notifications - Integrating data visualization tool The ideal candidate will have a proven track record of developing complex web applications. Familiarity with Firebase and Google Cloud is also a plus. Through this project, we aim to create a responsive, efficient and user-friendly platform. Your role will be crucial in achieving this goal. Please provide examples of web applications you have built previously that applied these skills, especially with real-time notifications and data visualization. I look forward to working with ...

I am looking for an experienced Android developer to help with a couple of key issues in my app. The primary focus should be on UI improvements. Key Tasks: token refresh functionality ignore battery optimize permission run at startups functionality UI change 2 new api's refactor code for easier maintenance currently displayes persistent notification dont want it Other requirements: - The app's token refresh mechanism must be revised and optimized - You should be able to ignore battery optimization permission I would ideally like a freelancer who is experienced with Java, Android Studio and UI/UX principles. Experience with token refresh mechanisms and battery optimization is also highly desirable. Please provide examples of previous relevant wor...

I'm looking for a skilled blockchain developer with hands-on experience in Smart Contracts and DApps. The ideal candidate should also have proficiency in Frontend technologies like React. Key requirements include: - Developing Smart Contracts - Building DApps I'm open to suggestions for specific functionalities or features to be included in the Smart Contracts or DApps. Please respond with your relevant experience and a proposed roadmap for the project.

AUTO-BIDS WILL BE REMOVED. I'm in search of an experienced developer skilled in Zendesk API integration for a project related to airline claim forms. I will provide you parts of the template and you will add the form, calculations, API integration and ticket creations. The website should be built in Laravel or secure platform. If you know about EC261 claims it makes it way easier to choose you. You will do the following: - Create a form which is predefined through parameters and questions. - Add airline and airport database and organize the data with live search preview. - Calculations based on airport distance and claim form. - Zendesk ticket creation along with correct ticket numer and relevant information. - Multilingual form (Swedish and English). Need someone to...

I'm looking for an experienced graphic designer to create a T-shirt design for an annual outing event. PLEASE READ THE LINES BELOW AND ONLY SUBMIT YOUR DESIGN IF YOU ARE CAPABLE OF DELIVERING WHAT IS NEEDED. I already ran this contest on this platform, chose a winner but was deceived by the quality of files provided. They were absolutely useless. I've had success finding great designers in in the past and for that reason only, I'm running the same contest again. Please prove I'm not wrong in trusting this platform. Only vector images will be accepted to award prize. Refrain from delivering bitmap images, JPEG, GIF, PNG, we don't want them, we don't need them. Only vector format files generated with CorelDraw or Illustrator will be accepted. This is ...

As an entrepreneur in the boutique industry, I'm looking for an experienced business plan writer to craft a comprehensive plan that appeals to a general audience. Specific knowledge or experience within the boutique or retail sector would be highly beneficial for this project. The business plan should be well-structured and contain all the necessary elements, including but not limited to executive summary, company description, market analysis, organization & management setup, product line, marketing & sales, and financial projections. Ideal Skills & Experience: - Proven track record in business plan writing - Knowledge or direct experience in boutique/retail industry - Understanding of both macro and micro market dynamics - Experience in structuring financial pro...

I'm in search of an experienced developer skilled in Zendesk API integration for a project related to airline claim forms. I will provide you parts of the template and you will add the form, calculations, API integration and ticket creations. The website should be built in Laravel or secure platform. If you know about EC261 claims it makes it way easier to choose you. You will do the following: - Create a form which is predefined through parameters and questions. - Add airline and airport database and organize the data with live search preview. - Calculations based on airport distance and claim form. - Zendesk ticket creation along with correct ticket numer and relevant information. - Multilingual form (Swedish and English). Need someone to start ASAP.

I'm seeking an experienced .NET programmer to add a new feature to my existing application. Specifically, I need a modification to bypass member search by using a querystring. The page concerned is this:- We wish to have a direct url that replaces the process of searching for a member (eg member no 161068) and arrives at page two directly. For example, entering 161068 in the search box and selecting Checkedandvetted then pressing 'review this company' moves the user to page 2- review your experience. This is what we want to achieve with a single url. This is so that we can provide a url like that will do the same as the previous steps. Ideal skills for this job will include: - Strong knowledge

I'm in need of a proficient developer with very specific skills for an exciting project. This project involves creating a poster maker for mobile platforms and should contain features like customizable templates and image importing. Key features and requirements of this project include: - Mobile platform compatibility: The poster maker should be intended for use on mobile platforms. - Feature implementation: It should possess two main features, 1. Ability to utilize customizable templates, and 2. Capability to import images. - Supported image formats: Importing of JPEG and PNG formats should be seamlessly facilitated. Ideal Skills: Expertise in mobile app development is required, with a profound understanding of integrating the required features aforementioned. Prior experie...

...Laravel developer who can integrate Dialogflow with my Laravel 7 application. Key Requirements: - The primary goal of the integration is to automate responses for user inquiries. Hence, you should be well-versed in both Laravel and Dialogflow to achieve this automation efficiently. - You'll need to set up a Dialogflow account and project from scratch as I haven't done this yet. Your experience in Dialogflow will be instrumental in ensuring that the setup is seamless and optimized for my application's needs. Ideal Skills: - Proficiency in Laravel 7 or 8 - Extensive experience in Dialogflow, including setting up accounts and projects - Strong understanding of automation and how DialogFlow can be leveraged to optimize user inquiries I'm looking for a proacti...

I'm in search of a skilled and experienced sales agent who will be responsible for selling a line of clothing internationally. I specifically need someone who can effectively utilize online sales channels like social media and e-commerce platforms. Key Responsibilities: -B2B - Promote and sell our clothing line across various international markets - Utilize social media platforms and e-commerce websites to maximize sales - Develop effective sales strategies and techniques The ideal candidate should have: - Previous experience in sales - Proven track record of successful sales, particularly on social media and e-commerce platforms - Excellent communication and negotiation skills - Strong understanding of international markets - Ability to think creatively and develop effecti...