API stands for Application Programming Interface, and it is an layer of interface that allows programs to interact with each other. An experienced API developer can build complex interactions between applications, making them faster, more reliable, and accurate. Whether you need a second opinion on your existing application or you want to create an entirely new application for your business, an expert API Developer can do the job for you.

An API Developer's job does not stop at developing. They can also work on design and implementation testing, guide through the entire architect process from prototyping to implementation, create custom system integration solution based on the project requirements, and collaborate with other teams to develop systems that meet customer expectations.

When hiring an API Developer through Freelancer.com, rest assured that they are as competent as any hired onsite software engineer.

Here’s some projects our experts have worked on:

  • Building custom interfaces to move large amounts of data efficiently between applications
  • Working with Javascript to allow websites to access external information relating to weather conditions
  • Creating Grafana dashboards for quick and easy visualization of data points
  • Developing scripts to connect external APIs with more heavy-duty platforms like Microsoft Azure
  • Debugging mobile apps involving fishing
  • Integrating AI capabilities into online shops
  • Automating regression tests so developers can work faster and more accurately

No matter what your business needs are in terms of API development, our expert freelancers are ready to take on the challenge and provide support whenever you need it. With expertise in debugging applications and web development, you're guaranteed to find the right developer for your project! So why wait? Post your project today at Freelancers.com and reap the benefits of working with an expert API Developer now!

From 191,354 reviews, clients rate our API Developers 4.86 out of 5 stars.
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    31 jobs found, pricing in AUD

    I'm in need of an expert proficient in Python and JavaScript to assist with data integration and automation processes in QuickBooks through its API. Key tasks will include: - Implementing data integration between various systems and QuickBooks - Streamlining automation processes to improve efficiency The overall aim is to maximize data accuracy. The ideal freelancer would have extensive experience working with QuickBooks API, specifically in data integration and automation processes. Hands-on experience with Python and JavaScript is a must. Your expertise will greatly help streamline our accounting process and ensure accuracy in our financial data.

    $137 (Avg Bid)
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    hello I need an expert, not someone who wants to waste my time Integrate Postman with Automate Enterprise Fortra I repeat and refer to someone who has already experienced this

    $69 / hr (Avg Bid)
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    I need to integrate my knowledge base to the sendpulse IA chatbot through API so that the questions answered through AI are according to the information from my clinic. Once done, I need access to the database to be able to update information whenever required.

    $240 (Avg Bid)
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    I have a some texts in Tamil language. You have to transliterate it to English, For example, in The word for mother is "அம்மா". The transliteration for this word is "amma". In short, I need php/js/api/any code to tamil to english transliteration (Not Translation). Do in any language, no problem, after transliteration, export to csv file.

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    developper for ALPHABOT 5 days left
    VERIFIED

    i need a dev to build a bot for alphabot task and restriction

    $186 (Avg Bid)
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    39 bids

    I am in need of a seasoned IT professional to enable real-time updates from Wetravel to Monday.com. My main focus is on: - Integrating Itinerary Changes - Booking Details - Payment Information The integration should specifically target these data fields and ensure that they sync in real-time. Experts in Wetravel and with a keen eye for detail will be best equipped for this task. I am pretty sure that your expertise will make this integration seamless and effective. Let's do this!

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    I'm seeking a highly experienced developer who can integrate eBay's API into our e-commerce platform. Although we haven't quite settled on whether Shopify or WooCommerce will be our marketplace, we're leaning towards one of these popular choices. We are also open to integrating the ebay API into a blank page for purpose of validation. The integration should primarily provide historical pricing for products searched by users. Our goal is to have a user search for a specific product, and be able to see a graph/chart showing historical pricing info of sale price and date over the last 12M. Ideal candidate should have: - Proven experience in similar projects. - An understanding of both Shopify and WooCommerce platforms. - Familiarity with eBay's API. - Ability to cre...

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    I am looking for a skilled programmer with experience in algo trading using Python - preferably with experience with crypto exchange API. I already have a specific strategy in mind, so I would like someone who can work with me to implement it. Ideal skills for this job include proficiency in Python and experience in API trading. I am looking for a programmer who can work with me on a long term basis with support. Details can be discussed.

    $24 / hr (Avg Bid)
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    Core PHP Bug Fixes Needed 5 days left
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    I am seeking an experienced PHP developer with an eye for detail to fix bugs in my Core PHP project. - Specific Task: The focus of this task will be catching and eliminating bugs impacting my project's overall performance. While the exact nature and functionalities that these bugs affect are unspecified, a careful and comprehensive approach is essential. - Ideal Skills: Proficiency in Core PHP is a requirement, along with solid problem-solving skills. Experience with debugging and fixing a variety of bugs will come in handy. By ensuring the smooth operation of my project, you'll contribute towards a better user experience and improved performance.

    $8 / hr (Avg Bid)
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    I'm seeking an experienced API developer to overhaul and expand the Airbnb integration within our booking software. I'm aiming to: - Increase the speed of data synchronisation. - Improve error handling measures. - Expand data fields captured in bookings. - Upgrade from Limited to Full Sync. Ideally, additional details beyond basic booking information need to be synchronised. This includes, but is not limited to, guest reviews, host details, and property ratings. The candidate should have a strong background in API development, preferably with experience in Airbnb API, booking systems, and data synchronisation optimisation techniques. A knack for robust error-proof coding is essential. Proficiency in data management with experience in synchronising large datasets for ...

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    Help needed with jakartaEE 5 days left
    VERIFIED

    Im building an API with jakartaEE, but I keep getting errors. I'm looking for a senior API developer to help me solve it.

    $41 (Avg Bid)
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    I'm seeking a skilled Python and C++ developer to create a Python wrapper for a C++ SDK that operates a camera. Key Requirements: - The wrapper must be compatible with Windows. - The main functionalities to control (focus adjustment, live view, capturing images and so on). - A basic GUI will be provided (in Qt Designer) so it would help if you have a working knowledge of PyQt or PySide - The GUI will have a Graphics view area and some buttons to click, focus, etc. You may use it to display the live image, focus, capture - You don't need to convert every function (there are 51 in the API) at one go - We can go milestone wise: + For example, 10 important functions in the 1st milestone: Initalise SDK, TerminateSDK, OpenSession, CloseSession, LiveView, Focus, Click etc) ...

    $505 (Avg Bid)
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    API Connection 5 days left
    VERIFIED

    I would like to automatically send the availability, prices, minimum stay, and, if possible, a custom link with parameters such as arrival and departure dates to Google Hotel Finder. I think the Google Price API can be used for this. Is that correct? Attached is a PDF with the documentation of the interface where the information can be retrieved. PHP 8.1 is installed on the server. the script should run by cronjob. Composer is not available.

    $265 (Avg Bid)
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    I am looking for a professional to Create an API to connect my Wordpress/Woocommerce with Epsilon Smart Invoice Software. I need the connection to be able to have a two-way connection including Uploading, Editing, Removing Products, Getting and Sending orders. Documentation of Epsilon Smart is available here in Greek:

    $813 (Avg Bid)
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    PLEASE DO NOT BID IF YOU HAVE NEVER CONNECTED A UPS API TO POWER BI OR AUTOMATE I need to integrate UPS Tracking API data with Power BI or Power Automate. In Power BI I can have a table of tracking numbers that need to be "called" to the API, and the reply by come back into Power BI preferably. KEY TASKS: - Set up a successful connection between UPS API and Power Automate or Power BI - Configure Power Automate/BI to retrieve the latest shipment scan data for multiple tracking numbers - Deliver this data directly to a PowerBI dashboard consistently SKILLS & EXPERIENCE: - Mastery in Power Automate and PowerBI integration - Proven track record handling UPS API or similar shipping APIs - IMPORTANT - Previous exposure handling multiple tracking numbers for shipments This str...

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    I'm interested in developing my store on the Salla platform as a reliable source for dropshipping, welcoming anyone registered as a vendor. I aim to enable other Salla vendors to display my products in their stores and ensure streamlined order processing. Key Features: - Automatic order notifications: I want to be notified instantly when a vendor receives an order for my products. - Product synchronization: My product list should be synced across all vendor stores, ensuring accuracy and consistency. Branding & Design: - A unique logo and color scheme: Tailored to my brand to make a standout storefront. - Consistent branding with Salla: It's important our aesthetic aligns with that of the Salla platform to cultivate a sense of professionalism and trust. Payment System: - Sa...

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    Overview: We are embarking on a project to develop a mobile warehouse picking Android application that seamlessly integrates with our Odoo ERP system. This application will encompass all warehouse operations functionalities, including receiving, picking, and dispatch, utilizing mobile scanners for efficiency. To accomplish this, we are seeking an experienced Odoo Warehouse Integration Specialist & Process Flow Consultant. This role primarily involves creating custom Odoo modules using Python to facilitate data exchange between the mobile application and Odoo, as well as assisting in visualizing the application's processes through process flow diagrams. Key Responsibilities: Custom Odoo Module Development: Utilize extensive knowledge of Odoo warehouse processes to develop custom ...

    $465 (Avg Bid)
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    I'm seeking an experienced developer versed in API testing using existing tools such as JMeter and others. The project focus is on API testing automation and the key aim here is to ensure API functionality. Scope necessary for the role includes: - Configure an existing tool to test all of our API endpoints. - Checking and guaranteeing the functionality of the API. - Proficiency in at least one API testing tool The API in question is used as a files check layer before uploading to S3. The users can upload files, list, download, and more. The API allow synchronous requests and async requests. We need to automate the testing in order to answer the following questions. - Are all the endpoints of the API working? - How much time is taking every endpoint (average time maybe)? - What was...

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    I am seeking a highly experienced senior developer to review and potentially refactor our existing React application. The project entails evaluating and enhancing the application to meet specific performance goals. The ideal candidate will possess a deep understanding of React and its ecosystem, with a proven track record of managing complex projects successfully. **Key Requirements:** - At least 7 years of experience in development, with substantial expertise in React. - A portfolio demonstrating experience in developing large-scale React applications (web and mobile). - A strong focus on enhancing application performance, specifically targeting load times and responsiveness. - A keen eye for adhering to industry standards and best practices in code development and performance optimizati...

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    Enterprise Web App Dev 3 days left
    VERIFIED

    We are looking to develop an enterprise web application. The main features of the application will be: 1) User authentication 2) Role-based permissions 3) In-app payment / monthly payment feature 4) Single-page landing page for advertisement 5) Up to 4 pages for the main application which will involve: 5a) Entering text into a textbox and parsing outputs 5b) Displaying progress using a chart 5c) Generating a pdf report 5d) Managing user access 6) The data to be displayed in the application will be served via api calls to an ip/port/endpoint The work should be completed by a single person in about 1 month. The person who will build the application will be eligible for future feature-development contracts.

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    I'm seeking an API expert with a solid background with tools like Zapier, Workato, and Make to integrate with bill.com. The ideal candidate must have prior experience connecting these two platforms and be familiar with the specific requirements of this project. Key Features: - Automate the data transfer between the two platforms - Sync task name, description, status, and due date - Approve and trigger mode of payment within The chosen freelancer will be tasked with ensuring the payment status in automatically updates upon approval on monday.com. In addition, it's crucial that the payment approval on triggers corresponding actions on bill.com. Required Skills and Experience: - Proven experience with API integration - Previous work with Zapier, Workato, and Make tools - Know...

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    I am looking for a proficient Javascript developer to create a new listing front run bot that will be compatible with both Uniswap V2 and V3 on Ethereum as well as Orca or Jupiter on Solana and use the API The bot should have specific capabilities like: - Outperforming average bots in trade execution - Providing detailed reports on activities performed Key responsibilities include: - Establishing a secure connection to the API - Code is optimised for speed & handles errors - proper indenting & commenting of code - Code must be clean, maintainable as several future feature enhancements are planned. Front end UI not required. I am looking for a programmer who can work with me on a long term basis as I have a few extensions to this as well as other similar projects I would like c...

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    We are seeking an expert team or multiple teams to build a freelance marketplace platform, similar to SAAS, with a focus on utilizing AI for enhanced user experience and custom/no coding. The platform must be built without the use of templates to ensure full customization. Full project details will be shared after the selected candidates sign an NDA and IP agreement. At this point i dont have any strict pricing plans, i am open to see how it turns up. Requirements: Expertise in UX/UI design for marketplace platforms Proficiency in coding with AI integration Ability to create a custom platform without template usage Experience in developing MVP versions of complex platforms Familiarity with mobile app development for both iOS and Android platforms Timeline: The project will begin with t...

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    I have flutter application I want to integrate the api in the api

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    I am looking for a skilled programmer with experience in algo trading using Python - preferably with experience with crypto exchange API. I already have a specific strategy in mind, so I would like someone who can work with me to implement it. Ideal skills for this job include proficiency in Python and experience in API trading. I am looking for a programmer who can work with me on a long term basis with support. Details can be discussed.

    $24 / hr (Avg Bid)
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    I am looking for a freelancer who can integrate the PayPal Checkout service into SendPulse service. The ideal candidate should have experience with API integration and be able to redirect users to a separate PayPal page for payment processing. We require this procedure: 1. SendPulse issues a PayPal link for the customer. 2. PayPal Payment page opens and there are option to pay by Debit Card , Credit Card. 3. After payment successful the api send back to SendPulse. 4. SendPulse receives the unique payment status as : successful payment , rejected payment or pending payment. Skills and experience needed for this project: - API integration - PayPal Checkout service integration - Strong problem-solving skills The job will be through Anydesk and Zoom Call

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    More details: What type of dynamic UI content do you want on your website? Interactive forms, Real-time updates What specific functionality do you need in the interactive forms? Data validation, File uploads, Conditional logic What APIs or services would you like to integrate into your website? Social media login, Email marketing

    $592 (Avg Bid)
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    I'm urgently looking for expertise in uninstalling an API key from a Ziraxia application. The platform on which the application is installed is currently unknown, therefore, a candidate who has extensive experience across Windows, macOS, and Linux platforms will be highly regarded. Skills and Experience: - Proficiency in working with different operating systems - Experience with Ziraxia applications - Proficiency in handling API keys Although it's unclear which information successful applicants are required to include in their application, it's more likely that I would consider those who provide details of their past work, experience, and detailed project proposals related to similar tasks. This is an urgently required service, and so candidates who can begin immediatel...

    $32 / hr (Avg Bid)
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    I am looking for a skilled programmer with experience in algo trading using Python - preferably with experience with crypto exchange API. I already have a specific strategy in mind, so I would like someone who can work with me to implement it. Ideal skills for this job include proficiency in Python and experience in API trading. I am looking for a programmer who can work with me on a long term basis with support. Details can be discussed.

    $20 / hr (Avg Bid)
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    Overview: Seeking experienced Core PHP developer to update existing APIs and develop new ones for grocery app, admin panel, and driver app. 60-70% of API work already done; focus on updates and new features. Responsibilities: * Review existing API architecture and functionality. * Gather updated requirements for apps from team. * Update existing APIs to reflect new requirements. * Develop new APIs for additional features. * Ensure seamless integration with existing system. * Implement security measures and authentication. * Test thoroughly for bugs and optimize performance. * Coordinate with team for front-end integration. * Provide documentation and support. Requirements: * Proven Core PHP API development experience. * Familiarity with maintaining and updating APIs. * Proficiency in ...

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    Explicit Filtering Phase project as discussed in chat for phrase detection and resultant redirect.

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