Payment Gateway Integration Engineers For Hire
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Hire smitk9999
With 7+ years of experience as a Senior Software Engineer, I help businesses build scalable, reliable, and modern digital products across web, mobile, desktop, cloud, and AI-driven platforms. My background covers full-stack development, backend architecture, cloud infrastructure, API integrations, automation, and...With 7+ years of experience as a Senior Software Engineer, I help businesses build scalable, reliable, and modern digital products across web, mobile, desktop, cloud, and AI-driven platforms. My background covers full-stack development, backend architecture, cloud infrastructure, API integrations, automation, and AI-powered solutions. I’ve worked with startups, agencies, and growing companies to develop production-ready systems that are fast, maintainable, and built for long-term growth. My core expertise includes: • C#, .NET / .NET Core, ASP.NET MVC, Web API • Angular, React.js, Next.js, Vue.js, TypeScript, JavaScript • SQL Server, PostgreSQL, MySQL, MongoDB, SQLite • AWS, Azure, Docker, CI/CD, Linux, Nginx, IIS • REST APIs, GraphQL, Microservices, Payment Integrations • WordPress, Magento, CMS Development • Mobile Development with React Native and Flutter • AI & Automation using OpenAI, ChatGPT, Gemini, MCP, n8n, Make.com • Blockchain & Web3 technologies including Solidity, Ethereum, Solana, Smart Contracts, DApps • Data Scraping, Automation, Dashboards, Power BI, Airtable, Google APIs I also have strong experience leading projects and collaborating with teams — from planning architecture and reviewing code to mentoring developers and delivering high-quality software on time. Recently, I’ve been working with AI agents, LLM integrations, and MCP-based workflows, helping businesses connect AI systems with real-world tools, APIs, databases, and business logic in practical and scalable ways. I focus on writing clean, maintainable code and building solutions that solve real business problems — whether it’s a SaaS platform, automation system, AI application, eCommerce platform, internal dashboard, or enterprise backend. I value clear communication, dependable delivery, and long-term professional relationships. Let’s build something great together. less -
Hire CVInfotech
Custom Software, AI and SaaS Product Studio. 14 Years, One Platform. We have built exclusively on Freelancer.com for 14 years. 500+ projects delivered. 5.0 rating across 512 reviews. 23% repeat hire rate. This is our only sales channel, so every project gets our full attention, not overflow from an agency spread...Custom Software, AI and SaaS Product Studio. 14 Years, One Platform. We have built exclusively on Freelancer.com for 14 years. 500+ projects delivered. 5.0 rating across 512 reviews. 23% repeat hire rate. This is our only sales channel, so every project gets our full attention, not overflow from an agency spread across ten platforms. What we build Custom software and SaaS platforms. Full stack, scalable, built to hand off cleanly. AI native products. ChatGPT, Claude and Gemini integrations, AI chatbots, voice agents, workflow automation. Ecommerce and marketplaces. Shopify, WooCommerce, multivendor platforms. WordPress, Laravel, React, Next.js and Node.js. Production grade, not template work. You will work directly with Akash (CTO, 14 years on this platform) and Shubham or Divya (client relationship leads, named by clients in reviews going back years). The same people from your first message to final delivery. No account handoffs, no rotating project managers. 152 professional recommendations back that consistency. 100% in house team. No outsourcing. We treat every project as if we are the ones maintaining it three years from now, because often we are. Some clients have stayed with us since 2012. If your project does not need custom development, we will tell you before you spend the money. Core expertise Frontend: React, Next.js, Vue, Angular, TypeScript Backend: Node.js, Express, NestJS, Laravel, FastAPI, Core PHP Mobile: React Native, Flutter Databases: PostgreSQL, MongoDB, MySQL, Supabase Cloud: AWS, Google Cloud, Docker AI and Automation: OpenAI, Claude and Gemini APIs, RAG pipelines, LangChain, AI agents CMS and Ecommerce: WordPress, Shopify, WooCommerce, Wix, Squarespace, BigCommerce, Magento, Joomla, OpenCart, Weebly, Webflow, GoDaddy Website Builder, headless CMS Payments, Billing and Subscriptions: Stripe, Stripe Connect, PayPal, Razorpay, WooPayments, NOWPayments, ccBill, LemonSqueezy, Peppol Voice and Telephony: VAPI for inbound and outbound call orchestration with function calling, Twilio for phone number provisioning CRM and Automation: HubSpot, Zapier Lead Generation and Landing Pages: HubSpot, Odoo, Webflow, GoHighLevel, Apify, Outscraper Email and Communication: Postmark, Nodemailer, Mailivery, Gmail API, Microsoft Graph API, Yahoo IMAP, SendGrid AI Assisted Development: Cursor, Replit, Bubble, WeWeb, Lovable, Bolt, Base44 Let's talk about what you are trying to build. less -
Hire vasundhara19
We help startups and growing businesses build AI-powered SaaS platforms, mobile apps, and web applications, from MVP to scale, with a focus on speed, performance, and real business outcomes. With 13+ years of experience and 500+ successful projects delivered, we don’t just develop software, we build products that are...We help startups and growing businesses build AI-powered SaaS platforms, mobile apps, and web applications, from MVP to scale, with a focus on speed, performance, and real business outcomes. With 13+ years of experience and 500+ successful projects delivered, we don’t just develop software, we build products that are designed to grow, handle scale, and deliver measurable impact. 🔹 Proven Results ➜ 500+ applications delivered globally ➜ MVPs launched in 30–45 days ➜ Apps scaled to 100K+ users ➜ AI solutions reducing manual work by up to 40% ➜ 4.9★ rating across 170+ client reviews 🔹 What We Do Best SaaS & MVP Development ➜ MVP development (idea → launch) ➜ Multi-tenant SaaS platforms ➜ Subscription & billing systems ➜ Admin dashboards & analytics ➜ Scalable backend architecture Mobile & Web App Development ➜ Flutter apps (iOS & Android) ➜ React Native cross-platform apps ➜ High-performance web applications ➜ App deployment & optimization AI-Powered Solutions ➜ AI-integrated web & mobile apps ➜ Chatbots & AI assistants ➜ LLM-based solutions (RAG, automation) ➜ Intelligent workflows & automation 🔹 Tech Stack ➜ Frontend: React.js, Next.js, Angular, Vue.js ➜ Backend: Node.js, Python (Django), Laravel ➜ Mobile: Flutter, React Native, Swift, Kotlin ➜ Databases: PostgreSQL, MySQL, MongoDB ➜ Cloud: AWS, Docker, DigitalOcean ➜ AI: LLMs, RAG pipelines, automation tools 🔹 Why Clients Work With Us ➜ MVPs delivered in 30-60 days ➜ Built for scale from day one (no rebuild later) ➜ Focus on business outcomes, not just code ➜ Clean, maintainable, production-ready systems ➜ Clear communication & daily updates ➜ Long-term support & product growth 🔹 Industries We Serve ➜ SaaS & Startups ➜ FinTech & Healthcare ➜ E-commerce & Marketplaces ➜ Logistics & Transportation ➜ Education & Fitness ➜ AI-driven platforms 🔹 We Are a Great Fit If You: ➜ Want to launch your MVP quickly and correctly ➜ Need to scale an existing product ➜ Want to integrate AI into your business ➜ Care about long-term product quality 🔹 Not the Right Fit If: ➜ You are looking for the cheapest option ➜ You need quick, low-quality solutions ➜ Budget is your only decision factor 🔹 What You Can Expect ➜ Transparent communication & daily updates ➜ Strong ownership of your project ➜ On-time delivery with proper QA ➜ Scalable, future-ready architecture ➜ Ongoing support after launch 🔹 Let’s Build Something That Scales If you're looking to build: ➜ AI-powered SaaS platform ➜ Mobile app (Flutter / React Native) ➜ Web application ➜ Startup MVP Send us a message or invite us to your project. Let’s turn your idea into a scalable, successful product. less -
Hire visionvivante
VISION TO REALITY Preferred Freelancer by Freelancer Vision Vivante is an agency in India dedicated to transforming ideas into scalable, high-performance platforms. With a strong foundation in strategy, design, and technology, we help businesses accelerate growth, simplify complexity, and thrive in the digital...VISION TO REALITY Preferred Freelancer by Freelancer Vision Vivante is an agency in India dedicated to transforming ideas into scalable, high-performance platforms. With a strong foundation in strategy, design, and technology, we help businesses accelerate growth, simplify complexity, and thrive in the digital age. ✅ End-to-End Services: -- Product Strategy & MVP Development -- Concept-to-Launch Solutions -- Product Roadmaps, User Flows & Wireframing -- Technical Architecture & Agile Team Assembly ✅ Custom Software Development: -- Full-Stack Web & Mobile Applications -- SaaS Platforms | Marketplaces | Internal Tools -- API Integrations, DevOps, Cloud Infrastructure ✅ Tech Stack Expertise: -- Frontend: React.js, Vue.js, Next.js -- Backend: Node.js, Laravel -- Mobile: Flutter, React Native -- Database: PostgreSQL, MySQL, MongoDB -- CMS: WordPress, Shopify, Magento, Prestashop, Custom CMS -- Infra: AWS, GCP, CI/CD, Serverless ✅ E-Commerce & Business Platforms: -- Shopify, WooCommerce, Magento -- Auction & Multi-Vendor Systems -- Payment Gateway Integration (incl. Stripe, CashApp, M-Pesa, Mada, HyperPay) ✅ Enterprise & Operational Systems: -- ERP, CRM & Warehouse Management -- Stock Control, Route Planning, Payroll, Ledgers -- Driver & Customer Apps with Live Tracking ✅ Industries Served: >> E-commerce | Fintech | Logistics | Travel | Legal | Education | Real Estate | Healthcare | Fitness | Marketplaces | Social Platforms | SaaS | Pickup and Delivery | POS (Point of Sale) Why Vision Vivante? ✅ Strategy-First Execution ✅ Cross-Platform Development Experts ✅ Agile Teams & Transparent Collaboration ✅ Deep Tech + Business Understanding ✅ Global Clients in 50+ Countries ✅ Fast Turnarounds, Scalable Codebases ✅ Dedicated PMs, Engineers & Designers ✅ Flexible Engagement Models Ready to Build? From digital products to complex systems, Vision Vivante turns your vision into a living, breathing platform. Work with a team that’s technical, strategic, and obsessed with your success. Let’s explore how we can collaborate. less -
Hire vladang
I’m a Senior Software Engineer with 10+ years of experience building secure, scalable, and high-performance web, mobile, and AI-powered applications that solve real business problems and drive measurable results. I specialize in end-to-end development — from planning and architecture to deployment, optimization, and...I’m a Senior Software Engineer with 10+ years of experience building secure, scalable, and high-performance web, mobile, and AI-powered applications that solve real business problems and drive measurable results. I specialize in end-to-end development — from planning and architecture to deployment, optimization, and long-term support. Whether you need a modern website, SaaS platform, mobile app, AI-powered solution, eCommerce store, custom CMS, API integration, automation workflow, or enterprise application, I deliver reliable, scalable, and future-ready solutions tailored to your goals. My expertise includes: • Frontend: React.js, Next.js, Vue.js, Nuxt.js, Angular, TypeScript, JavaScript, Tailwind CSS, shadcn/ui, responsive UI/UX, performance optimization. • Backend: Node.js (Express, NestJS), Python (Django, Flask, FastAPI), PHP (Laravel), C# (.NET), REST APIs, GraphQL, microservices, authentication, real-time systems. • Mobile: React Native, Flutter, Native Android (Java/Kotlin). • WordPress & CMS: WordPress, WooCommerce, Elementor, Gutenberg, ACF, custom themes/plugins, Sanity, Strapi, Contentful, Payload CMS, Directus, Storyblok, Builder.io, and headless CMS architectures. • Shopify & eCommerce: Shopify, Shopify Plus, Liquid, Hydrogen/Oxygen, custom apps, WooCommerce, Stripe, PayPal, subscriptions, and conversion-focused stores. • AI & Automation: OpenAI GPT, Claude, LangChain, Llama, RAG, AI chatbots, intelligent workflows, automation, and custom AI solutions. • Cloud & DevOps: PostgreSQL, MySQL, MongoDB, Firebase, Supabase, Docker, CI/CD, AWS, Azure, GCP, Vercel, and scalable cloud infrastructure. I focus on building clean, maintainable, and business-focused solutions with strong communication, reliable delivery, and attention to detail. From startups and MVPs to enterprise systems and long-term product development, I help turn ideas into scalable, high-quality products. If you’re looking for an experienced expert who can handle everything from modern web platforms and mobile apps to AI integrations, WordPress, Shopify, CMS development, and complex custom solutions — let’s build something exceptional. less -
Hire flapjakc
I am a full-stack developer and business strategist with 8+ years of professional experience spanning SaaS platforms, e-commerce solutions, and AI-integrated web applications. I deliver end-to-end solutions using WordPress, WooCommerce, Shopify, Laravel, Node.js, React, and Next.js — ensuring responsive,...I am a full-stack developer and business strategist with 8+ years of professional experience spanning SaaS platforms, e-commerce solutions, and AI-integrated web applications. I deliver end-to-end solutions using WordPress, WooCommerce, Shopify, Laravel, Node.js, React, and Next.js — ensuring responsive, conversion-focused, and scalable systems. My expertise includes API integrations, payment gateways, AI-powered tools, headless CMS, and marketplace platforms. What sets me apart: • Business-first approach — With a Bachelor of Commerce (Marketing) from Haskayne School of Business and a BSc in Psychology from University of Calgary, I understand user behavior and business strategy, not just code. • Certified professional — Google Ads Search Certified, Google Analytics Qualified, Microsoft 365 SMB Masters Sales Professional. • Full project lifecycle — From market research and UX strategy to deployment, optimization, and ongoing support. I focus on maintainable, event-driven, deploy-safe architectures, performance optimization, and UX-driven design. I have successfully launched subscription systems, affiliate marketplaces, and multi-tenant SaaS projects — always emphasizing reliability, continuity, and measurable business impact. Let's build something great together. less -
Hire ranjika08
I have been offering expert website development, digital marketing, and business automation services for businesses in various niches for the last 12+ years. During these years, I have gained expertise in the following fields: 1. Website Design and Development: WordPress website development, redesign, and complete...I have been offering expert website development, digital marketing, and business automation services for businesses in various niches for the last 12+ years. During these years, I have gained expertise in the following fields: 1. Website Design and Development: WordPress website development, redesign, and complete makeovers Shopify and WooCommerce ecommerce website design Wix and Squarespace website design Custom-coded websites (Laravel, React, Vue, Node, Angular, PHP) Responsive, mobile-friendly design Figma/XD to responsive web design Full website testing and QA 2. Website Support & Maintenance: Bug fixing, malware removal, and speed optimization Site migrations and checkout/webmail troubleshooting Monthly maintenance plans (updates, backups, uptime, security) 3. Search Engine Optimization (SEO): Expert SEO audits and technical SEO Increase website traffic and Google ranking Local SEO and Google Business Profile management Competitive keyword research Backlinking, content strategy, and blog outreach 4. Marketing & Growth: Paid campaigns across Google, Facebook, Instagram, LinkedIn, and TikTok Social media management Content writing for websites and blogs Qualified lead generation Platform setup and troubleshooting: Google Merchant Center, Google Ads, GA4, Tag Manager, Search Console, Meta Business Manager & Pixel, TikTok Ads/Shop, Bing/Microsoft Ads 5. Graphic Design & Branding: Logo design and brand identity UI/UX design for websites and apps Banner, brochure, and business card design Brand books and branding guidelines 6. AI & Automation: Chatbot setup (rule-based, AI-powered, or hybrid) Chatbot integrations: payment links, CRM data submission, owner notifications AI automation for platforms like Notion, HubSpot, and CMS tools Full business process automation across multiple workflows Ongoing automation and chatbot maintenance My services are outcome driven and I love to keep myself updated with the latest tools and trends. No matter the current standing of your website or business, I will bring visible improvements to its design, performance, and growth — and with the right mix of marketing and automation, I will make sure your visitors turn into customers, faster. Use the "HIRE ME" button at the right to start the process of turning your dream into a reality. less -
Hire Joya1996
I have been in the website development, digital marketing, and AI automation field for the last 8+ years. Over the years, I've developed expertise in the following areas: CMS (Content Management System) CSS WooCommerce WooCommerce Redesign Dropshipping eCommerce Elementor Figma Google PageSpeed Insights HTML Page...I have been in the website development, digital marketing, and AI automation field for the last 8+ years. Over the years, I've developed expertise in the following areas: CMS (Content Management System) CSS WooCommerce WooCommerce Redesign Dropshipping eCommerce Elementor Figma Google PageSpeed Insights HTML Page Speed Optimization PSD to HTML PSD2CMS Shopify Shopify Development Shopify Redesign Shopify Templates Squarespace Web Design Web Development Web Services Webflow Website Build Website Design Website Development Website Maintenance Website Bug Fixing Wix WordPress WordPress Design WordPress Redesign WordPress Multilingual WordPress Plugin Laravel React Vue Node Angular PHP Local SEO Technical SEO Ecommerce SEO Keyword Research Google Ads Meta Ads TikTok Ads Google Merchant Center Google Analytics (GA4) Google Tag Manager Google Search Console Google Business Profile Meta Business Manager Meta Pixel Social Media Management Content Writing Lead Generation Graphic Design Logo Design Adobe Photoshop Banner Design UI/UX Design AI Chatbot Development Business Automation My approach is results-oriented, and I stay current with the latest trends and updates. Regardless of your website’s current state, I’ll enhance its appearance and functionality. With my marketing strategies, I’ll ensure your site visitors convert into loyal customers quickly. Click the "HIRE ME" button on the right to begin transforming your vision into reality. less -
Hire mannanmaan1425
✅ Core Expertise Web & App Development | SaaS & CRM Systems | AI Solutions | Automation | Digital Experience Web Development & Design – Modern, responsive, SEO-optimized, high-converting websites Mobile App Development – Cross-platform & native (Android & iOS) SaaS / CRM Platforms – Scalable systems &...✅ Core Expertise Web & App Development | SaaS & CRM Systems | AI Solutions | Automation | Digital Experience Web Development & Design – Modern, responsive, SEO-optimized, high-converting websites Mobile App Development – Cross-platform & native (Android & iOS) SaaS / CRM Platforms – Scalable systems & enterprise-grade applications, dashboard development Automation & Workflows – N8N, Zapier, Make.com, Zoho integrations SEO & Performance Optimization – Technical SEO, speed, and conversion optimization ✅ What I Offer 🤖 AI & Machine Learning AI-powered applications & intelligent systems Chatbots, NLP & Generative AI AI Agents & workflow automation Predictive analytics & data-driven solutions 🏗 Development & Architecture Full-Stack Development (UI/UX + Backend Engineering) REST & GraphQL API Development Scalable backend systems (Django, FastAPI, Node.js, ASP.NET) Software Architecture & System Design 🛒 E-Commerce & CMS Shopify & Custom E-Commerce Solutions WordPress Development (Elementor, Custom Themes) Payment gateway & third-party integrations ⚙️ Automation & Engineering Web scraping & data extraction Workflow automation systems AI-driven process automation Microcontroller & hardware integrations ✅ Additional Capabilities (Positioned as supporting skills, not core focus) Technical Writing & Documentation Project Management (Agile, Asana, workflows) UI/UX & Graphic Design fundamentals Word processing & structured documentation Data handling & operational support systems ✅ Tech Stack Python, JavaScript, C#, Dart, Java, Swift Django, Flask, FastAPI, Node.js, NestJS, ASP.NET Core React, Next.js, Vue, Angular | Flutter PostgreSQL, MongoDB | Docker, Kubernetes, AWS, GCP PyTorch, Scikit-learn, OpenAI N8N, Zapier, Make.com, Zoho ✅ Why Work With Me 8+ Years of Proven Experience Clean, Scalable & Maintainable Architecture Strong Communication & Remote Collaboration Business-Focused & Results-Driven Approach On-Time Delivery with High-Quality Standards less -
Hire cliftonc20
I help businesses automate workflows and save time using AI. I build custom GPT-powered chatbots, document processing tools, and automation systems that reduce manual work and improve efficiency. Whether you need a chatbot for your website, AI-powered data processing, or workflow automation, I can deliver a reliable...I help businesses automate workflows and save time using AI. I build custom GPT-powered chatbots, document processing tools, and automation systems that reduce manual work and improve efficiency. Whether you need a chatbot for your website, AI-powered data processing, or workflow automation, I can deliver a reliable solution quickly. What I can build for you: • AI chatbots (customer support, FAQ, internal tools) • Document Q&A systems (PDF, CSV, knowledge base) • GPT-powered automation workflows (Zapier / Make) • Custom backend APIs using Python and FastAPI Tech stack: Python • OpenAI (GPT-4/5) • FastAPI • Zapier / Make • REST APIs • PostgreSQL Why work with me: • Fast delivery and clear communication • Focus on business results, not just code • Clean, scalable, and production-ready solutions Let’s build something that saves you time and grows your business. less
