Full-Stack Developer with 5+ years of experience building web platforms, SaaS products, and automation systems.
I help businesses turn ideas into working products — from backend architecture to user-facing interfaces — with a strong focus on performance, scalability, and clean code.
🚀 What I do best:
* Build full-stack web applications (Java, Vue.js, Python)
* Develop scalable SaaS platforms
* Design and integrate REST APIs
* Implement payments (Stripe subscriptions, billing flows)
* Set up authentication (OAuth, secure user systems)
* Create Telegram bots and automation tools
* Automate business processes and workflows
⚙️ Tech stack:
Java, Python, JavaScript, Vue.js, Docker, AWS, CI/CD, Git, Linux
I have hands-on experience deploying applications to the cloud, setting up CI/CD pipelines, and ensuring systems run reliably in production.
I’m focused on delivering real business value — not just code. Clear communication, meeting deadlines, and understanding your goals are my priorities.
If you need someone who can build your product end-to-end or improve your current system — let’s talk.
Python
Telegram API
Java
Spring Boot
Spring MVC
Spring Security
JavaScript
Vue.js
D3.js
Bootstrap
CSS
HTML
Asynchronous I/O
PostgreSQL
MongoDB
Core Java
Docker
Vadym T.
Odessa, Ukraine
$20/hr
5.0
2 jobs
I build complex WordPress and WooCommerce platforms that go far beyond basic theme setup.
My focus is custom WordPress development, WooCommerce architecture, custom plugins, API integrations, Stripe payments, ERP integrations, booking systems, e-learning platforms, AI-powered features, and internal workflow automation.
I can help you with:
• Custom WooCommerce stores and large product catalogs
• WooCommerce checkout, payment, delivery, and order logic
• Stripe, Apple Pay, Google Pay, and custom payment flows
• Custom WordPress plugin development
• ACF-based WordPress architecture
• REST API integrations with third-party services
• ERP, delivery, marketplace, and CRM integrations
• Custom admin panels and internal workflow automation
• Booking systems, user dashboards, and client portals
• E-learning platforms and subscription-based platforms
• AI-powered search, translation, and automation features
• REST APIs for mobile apps and external websites
• Performance optimization and production fixes
Recent WordPress projects I worked on include:
• A WooCommerce store with 5,000+ SKUs, payment integrations, delivery APIs, ERP sync, B2B automation, marketplace synchronization, and AI-powered product search
• A custom WordPress learning platform with user accounts, lesson scheduling, Stripe subscriptions, custom admin tools, AI translations, text-to-speech, pronunciation scoring, video lesson integrations, and mobile API
• A custom booking platform with Stripe payments, flight tracking, holiday-based pricing logic, user dashboard, admin management tools, and external API for connecting other websites
My core stack includes WordPress, WooCommerce, PHP, ACF, JavaScript, REST API, Stripe, PostgreSQL, MySQL, React, Next.js, Node.js, Cloudflare, Vercel, and Linux-based deployment environments.
What makes me different is that I do not just install themes and plugins. I build custom business logic, integrations, admin workflows, and production-ready systems that are stable, maintainable, and designed for real operations.
I can take ownership of the full development process: planning, architecture, backend logic, frontend implementation, API integrations, testing, deployment, and post-launch fixes.
If you need a WordPress/WooCommerce developer who can handle complex functionality, custom integrations, and production-level development, I can help you build it properly.
Stripe API
WordPress
SQL
PHP
React
Next.js
PostgreSQL
JavaScript
TypeScript
Redis
Node.js
Git
REST API
Vercel
WooCommerce
CRM Automation
Anatolii N.
Kyiv, Ukraine
$35/hr
4.9
30 jobs
Payment bugs and failed webhooks cost you real revenue. I build and fix payment flows that reconcile to the cent: Stripe integrations, subscriptions and billing, invoicing, card processing, bank APIs. 10+ years of backend engineering (Node.js, TypeScript, PostgreSQL), currently a team lead at a fintech company processing millions of transactions. $100K+ earned on Upwork, 100% Job Success, including two 6-year contracts with the same clients
Senior full-stack engineer with $100K+ earned on Upwork, 4,300+ hours, and a 100% Job Success Score. I ship and stabilize production web systems—from urgent Vue/Nuxt/React frontend work to Node.js APIs, PostgreSQL, payment flows, and AI integrations.
I’m a strong fit when you need:
• a production bug fixed without destabilizing an existing codebase
• a responsive landing page or frontend implemented from Figma
• a Node.js/TypeScript API or third-party integration
• payment, transaction, invoicing, or fintech business logic
• an n8n or OpenAI/Claude workflow engineered with retries, validation, and safe failure handling
My Upwork history includes long-running full-stack products, complex frontend animation, and quick delivery on focused frontend tasks. Clients have specifically highlighted speed, reliability, and the ability to get difficult UI work right the first time.
Core stack: Node.js, TypeScript, JavaScript, PostgreSQL, Vue.js, Nuxt, React, NestJS, REST APIs, Docker, payment integrations, n8n, and OpenAI/Claude APIs.
Send me the current codebase, design, or production issue, and I’ll give you a direct assessment of the solution, risks, and realistic delivery time.
Stripe
API Integration
Node.js
Payment Gateway Integration
FinTech
PostgreSQL
TypeScript
JavaScript
Software Architecture
Database Design
REST API
Payment Processing
Vue.js
NestJS
AI Agent Development
n8n
OpenAI API
React
Nuxt.js
Front-End Development
Igor B.
Kharkiv, Ukraine
$20/hr
4.9
30 jobs
MVP in under a month — not the usual 3-6. I'm a Bubble Developer and Full Stack Developer with 12+ years building products people actually use, from SaaS platforms to AI tools and marketplaces.
✨ A few highlights
• 12 + years as a Full Stack Developer and 9+ years as a Bubble Developer
• 150+ Bubble applications delivered
• 60+ AI-powered products built
• 80% of startup MVPs continued to secure investment after launch
🛠️ What I build as a Bubble Full Stack Developer
💻 Bubble Development
• SaaS platforms
• Startup MVPs
• Two-sided marketplaces
• CRM & ERP systems
• Client portals
• Dashboards
• Internal business tools
• Responsive Bubble applications
• Database architecture & scalable workflows
• API integrations & backend logic
🤖 AI Development
• OpenAI, Claude & Gemini integrations
• AI agents
• RAG systems
• AI chatbots
• Document processing
• AI-powered business automation
⚡ Automation & Integrations
• n8n, Make & Zapier
• Stripe
• Twilio
• Airtable
• REST APIs
• Google, Meta & third-party integrations
• End-to-end workflow automation
🌍 Why clients choose me
✨ Bubble Full Stack Developer with strong technical foundations—not just a no-code builder.
✨ I build clean, scalable Bubble architectures that are easy to maintain.
✨ Fast communication, transparent delivery, and long-term support.
✨ Focused on building products that are reliable, scalable, and ready for growth.
🚀 Whether you need a Bubble Developer to build an MVP, a Bubble Full Stack Developer to scale an existing platform, or someone to integrate AI and automation into your product, I’d love to help bring your idea to life.
Stripe
API
API Integration
Bubble.io
Web Development
Full-Stack Development
JavaScript
Web Application
Web Design
No-Code Development
AI App Development
SaaS Development
HTML5
PHP
Database Design
CSS
Mobile App Development
Android App Development
React
Next.js
Andrii L.
Kharkiv, Ukraine
$45/hr
5.0
11 jobs
I'm a senior full-stack developer who ships complete products end to end — from architecture to the App Store and Google Play. Over the last 18 months I built a full social-network mobile app solo: a React Native/Expo frontend and a Node/Express/GraphQL/MongoDB backend, including Stripe payments, multi-provider auth (Google, Apple, Facebook, X, and email), push notifications, share extension, and background worker services for feeds and notifications.
Beyond mobile, I build web apps with React and Next.js, and backends with queue-backed architectures (queue → worker, webhooks, eventual consistency) and cloud storage (Cloudflare R2, AWS). Before going full-time into development, I ran my own e-commerce businesses for 10+ years — so checkout flows, Stripe payments, and real inventory logic make sense to me from both the code and the business side.
What I can help you with
✔ Full-stack web application development
✔ React / Next.js applications
✔ React Native mobile apps (Android & iOS)
✔ Backend development with Node.js
✔ GraphQL APIs and Apollo
✔ Authentication (JWT, OAuth, Google Sign-In, NextAuth)
✔ Chrome Extensions (Plasmo)
✔ API integrations
✔ AI-powered features and automation
✔ Performance optimization
✔ Refactoring existing codebases
✔ Bug fixing and long-term project support
Main Technologies
Frontend
• React
• Next.js
• TypeScript
• Redux Toolkit
• Material UI
• Ant Design
• Tailwind CSS
• SCSS / CSS Modules
• HTML5 / CSS3
Backend
• Node.js
• GraphQL
• Apollo
• MongoDB
• REST APIs
• Authentication & Authorization
• Server-side rendering (SSR)
• API design and integrations
Mobile
• React Native
• Android
• iOS
• App Store & Google Play deployment
Why clients enjoy working with me
I don't just write code—I solve business problems.
Running my own businesses taught me how to think from the client's perspective, understand priorities, estimate development efforts, and focus on features that actually bring value instead of unnecessary complexity.
Since becoming a full-time developer, I have worked on complex web platforms, mobile applications, backend systems, authentication services, browser extensions, and integrations with numerous third-party APIs.
I have extensive experience working with:
• Large production codebases
• Modern AI development tools (ChatGPT, Claude, Cursor, GitHub Copilot)
• External APIs and SDKs
• Payment providers
• Cloud storage
• Push notifications
• Google services
• Mobile authentication
• Real-time applications
I care about writing clean, maintainable, and scalable code. Communication, reliability, and meeting deadlines are just as important to me as the technical implementation itself.
If you're looking for a developer who can take ownership of a project, communicate clearly, and deliver production-ready solutions, I'd be happy to discuss your project.
Stripe
React
React Native
Node.js
Next.js
TypeScript
Tailwind CSS
Firebase
Supabase
ExpressJS
GraphQL
MongoDB
PostgreSQL
Ecommerce Website Development
Payment Processing
REST API
Google Chrome Extension
JavaScript
Redux
MERN Stack
Vasyl P.
Chernivtsi, Ukraine
$30/hr
5.0
3 jobs
Senior Full Stack Developer specializing in Next.js, NestJS, React, Node.js, TypeScript, SaaS development, AI integrations, Stripe, and React Native. I build production-ready apps, fix existing applications, complete AI-generated web apps, and scale SaaS products.
🏆 12+ years in JavaScript and TypeScript development
✅ 45+ web and mobile products delivered
✅ Full-cycle SaaS development from architecture to deployment
✅ Experience with EdTech, eCommerce, CRM, marketplaces, payments, AI SaaS, and mobile apps
2,600+ completed orders and 520+ registered customers supported through an eCommerce and CRM platform built with Next.js, React, Node.js, and TypeScript.
90% faster order processing and up to 80% less manual work through workflow automation, API integrations, and React admin dashboard improvements.
10+ React Native applications delivered for iOS and Android with authentication, payments, notifications, API integrations, and production releases.
✅ SENIOR FULL STACK DEVELOPER SERVICES
As a Senior Full Stack Developer, I build new SaaS MVPs, join existing teams, rescue unfinished applications, fix production bugs, add features, refactor legacy code, and prepare AI-generated applications for launch.
As a Next.js Developer, I build SaaS applications, dashboards, admin panels, customer portals, marketplaces, SSR applications, and responsive interfaces using Next.js App Router, React, TypeScript, Tailwind CSS, TanStack Query, Zustand, Redux, and React Hook Form.
As a NestJS Developer and Node.js Developer, I build REST APIs, authentication, RBAC, multi-tenant SaaS architecture, background jobs, WebSocket features, payment systems, file processing, automation, and secure backend services.
As a React Developer, I create reusable components, forms, tables, dashboards, responsive layouts, and maintainable frontend architecture.
As a React Native Developer, I develop iOS and Android applications with APIs, authentication, subscriptions, push notifications, analytics, and store deployment.
✅ SAAS DEVELOPMENT
I work on SaaS MVP development, Full Stack SaaS development, B2B SaaS platforms, multi-tenant SaaS applications, AI SaaS products, EdTech SaaS platforms, fintech applications, eCommerce systems, CRM platforms, booking products, marketplaces, admin panels, and internal tools.
I take SaaS products from architecture and database design through frontend, backend, testing, deployment, scaling, and support.
✅ AI DEVELOPMENT AND AI INTEGRATIONS
As an AI Developer and AI SaaS Developer, I integrate OpenAI API, Claude API, LLM features, AI chatbots, AI content generation, document processing, PDF processing, classification, structured outputs, prompt engineering, automated workflows, and AI usage tracking.
I also fix and complete AI-generated web applications created with Cursor, Claude Code, ChatGPT, Lovable, Bolt, or similar AI development tools.
I can audit an AI-generated codebase, fix TypeScript errors, repair frontend and backend logic, complete missing features, remove duplicated code, secure APIs, optimize performance, connect databases, integrate third-party APIs, and prepare the application for production deployment.
✅ STRIPE AND PAYMENT DEVELOPMENT
As a Stripe Developer, I implement Stripe Checkout, Stripe subscriptions, recurring billing, Payment Intents, Stripe Connect, customer portals, pricing plans, trials, invoices, webhooks, and subscription lifecycle management.
I fix failed Stripe webhooks, broken checkout flows, incorrect subscription states, duplicate payments, and database synchronization problems.
✅ BUG FIXING AND EXISTING APPLICATIONS
I provide Next.js bug fixing, React bug fixing, TypeScript error fixing, NestJS API development, Node.js backend development, Vercel deployment fixes, production bug fixing, performance optimization, Prisma and MongoDB fixes, PostgreSQL query optimization, authentication fixes, feature development, code refactoring, legacy codebase stabilization, and AI-generated app completion.
I preserve existing behavior where required, understand the business logic before changing code, and avoid quick fixes that create new technical debt.
✅ TECHNOLOGY STACK
Frontend: Next.js, React, React Native, TypeScript, Tailwind CSS, Redux, Zustand, TanStack Query, React Hook Form.
Backend: NestJS, Node.js, Express.js, REST API, WebSocket, Prisma ORM, PostgreSQL, MongoDB, MySQL, Firebase.
AI and Payments: OpenAI API, Claude API, AI agents, LLM integrations, Stripe, third-party APIs, PDF and file processing.
DevOps: AWS, Vercel, Ubuntu, Nginx, PM2, GitHub Actions, CI/CD, production deployment.
You can hire me as a Senior Full Stack Developer, Next.js Developer, NestJS Developer, React Developer, Node.js Developer, TypeScript Developer, SaaS Developer, AI Developer, Stripe Developer, or React Native Developer.
Send me your requirements, repository, technical problem, or unfinished AI-generated application. I will help you build, fix, complete, launch, or scale it
Stripe
API Integration
Next.js
NestJS
TypeScript
SaaS
React
MERN Stack
Node.js
Full-Stack Development
OpenAI API
PostgreSQL
Web Application
React Native
Amazon Web Services
Payment Gateway Integration
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