You will get Node.js Developer | Express REST API + GraphQL backend
Top Rated
Top Rated
Project details
You will get a clean, well-documented Node.js backend: REST APIs with Express or NestJS, or a GraphQL layer, built in TypeScript and ready for production.
WHAT YOU GET
• REST or GraphQL API with JWT / OAuth auth and role-based access
• PostgreSQL or MongoDB schema with Prisma, TypeORM or Mongoose
• Third-party integrations: Stripe, Twilio, SendGrid, OpenAI, webhooks
• Background jobs and queues with BullMQ or Redis
• Swagger / OpenAPI docs and Postman collection
• Unit and integration tests, Docker setup and CI pipeline
• Deployment to AWS, Railway, Render or your own VPS
WHO IT'S FOR
Startups and teams that need a reliable backend behind a web or mobile app: SaaS products, marketplaces, dashboards, internal tools, mobile app APIs.
WHY ME
2,500+ hours on Upwork, 100% Job Success. TypeScript everywhere, clear commits, and a delivery schedule we agree before I start.
Not sure about scope? Start with the $50 kickoff tier: I review your requirements and send back an API plan and a fixed quote for the full build.
Keywords: node.js developer, backend developer, express, nestjs, graphql, rest api, typescript, mongodb, postgresql, api integration, prisma, microservices
WHAT YOU GET
• REST or GraphQL API with JWT / OAuth auth and role-based access
• PostgreSQL or MongoDB schema with Prisma, TypeORM or Mongoose
• Third-party integrations: Stripe, Twilio, SendGrid, OpenAI, webhooks
• Background jobs and queues with BullMQ or Redis
• Swagger / OpenAPI docs and Postman collection
• Unit and integration tests, Docker setup and CI pipeline
• Deployment to AWS, Railway, Render or your own VPS
WHO IT'S FOR
Startups and teams that need a reliable backend behind a web or mobile app: SaaS products, marketplaces, dashboards, internal tools, mobile app APIs.
WHY ME
2,500+ hours on Upwork, 100% Job Success. TypeScript everywhere, clear commits, and a delivery schedule we agree before I start.
Not sure about scope? Start with the $50 kickoff tier: I review your requirements and send back an API plan and a fixed quote for the full build.
Keywords: node.js developer, backend developer, express, nestjs, graphql, rest api, typescript, mongodb, postgresql, api integration, prisma, microservices
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$999
|
Standard
$2,999
|
Advanced
$7,999
|
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 30 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
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CA
Christiana A.
Jul 6, 2026
AI Agent Full Stack Developer for AI SaaS Chatbot
Great experience working with Volodymyr and the team. Communication was clear and fast, and the work was delivered on time with high quality. They were proactive and easy to collaborate with. Would definitely work with them again. We had very high stake deliverables and they were just what we needed!
CA
Christiana A.
Jun 10, 2026
Discovery for ChatKYC
Clear, effective, experienced and great quality work!
IK
Irina K.
May 18, 2026
30 minute consultation
I needed Agency AI consultation, Volodymyr provided all the needed expertise and technical details to the required depth.
HS
Harshal S.
Apr 23, 2026
30 minute consultation
AG
Andy G.
Apr 22, 2026
60 minute consultation
Vlad was extreamly easy to speak to. He was able to translate my ideas and concepts into a detailed specification for my project. His communication and attention to details is excellent. He is clearly very experienced and knowladgble person who is able to contibute and add value to the process.
About Volodymyr
AI Agent Developer / AI SaaS Developer | AI Chatbot RAG LangChain MCP
100%
Job Success
Lviv, Ukraine - 10:06 pm local time
ABOUT ME
8+ years and 90 completed projects as an AI Agent Developer and AI SaaS Developer across AI SaaS Platform, SaaS MVP, AI Chatbot and RAG delivery
$300K+ earned on Upwork, 2,507 hours billed, 100% Job Success, Top Rated Plus as an AI Agent Developer
10,000+ active users on a multi-tenant AI SaaS platform (Stripe billing, RBAC, row-level security) built end to end as an AI SaaS Developer
300+ chats/day in production on a RAG chatbot for support and lead gen (UK energy company) as an AI Chatbot Developer
100K+ documents processed through RAG pipelines - invoices and bills of lading for port logistics - as an ai agent developer with document intelligence
5.0 star cross-platform AI app (iOS, Android, Azure backend) shipped solo in 3 months as a full stack ai developer - "highly skilled across the full stack"
50+ AI automation workflows (n8n, Make) connecting AI agents to CRMs, Slack, Telegram, WhatsApp as an ai automation developer
4 of my last 4 consultations turned into ongoing projects as an AI SaaS Developer and ai app developer
WHERE I DELIVER
As an AI Agent Developer - custom AI agents and agentic systems with LangChain, LangGraph and MCP: tool calling, multi agent workflows, error handling, observability, production deployments
As an AI SaaS Developer - multi tenant AI SaaS platforms and SaaS MVPs with Next.js, Node.js, Python FastAPI, Supabase and Stripe billing, from idea to production in 6-12 weeks
As an AI Chatbot Developer - RAG chatbots and AI assistants for customer support and lead generation: WhatsApp, Telegram, web widgets, CRM integrations, human handoff
As an mcp developer - custom MCP servers connecting your APIs, databases and internal tools to Claude Desktop, ChatGPT and Cursor
As a rag developer and llm developer - retrieval pipelines with pgvector and Pinecone: embeddings, hybrid search, reranking, grounded answers with citations
As a generative ai developer and python ai developer - OpenAI API and Anthropic Claude API integrations inside existing products without breaking what works
INDUSTRY IMPACT
AI SaaS Platform, AI Chatbot SaaS, RAG Knowledge Base - 10,000+ users, subscription and usage-based billing, 99.9% uptime as an AI SaaS Developer
Document Automation, Document Intelligence, OCR AI - 100K+ documents, 90%+ manual work reduction in port logistics as an AI Agent Developer
Ecommerce Chatbot, WhatsApp Automation, Customer Support AI - 300+ chats/day with lead capture and human handoff as an AI Chatbot Developer
Healthcare AI, Real Estate AI, Fintech MVP, EdTech AI - AI agents, RAG systems and AI SaaS delivered as an ai agent developer / ai saas developer
Voice-to-Book AI App, Cross-Platform Mobile AI - 5.0 stars on App Store and Google Play, shipped solo as an ai application developer
HOW I BUILD
25+ builds as an AI Agent Developer: langchain, langgraph, mcp server, tool calling, function calling, multi agent systems, agentic workflows, prompt engineering, rag pipeline, retrieval augmented generation
15+ platforms as an AI SaaS Developer: nextjs, react, typescript, nodejs, python fastapi, supabase, postgres, pgvector, pinecone, stripe, aws, azure, vercel
10+ bots as an AI Chatbot Developer: whatsapp chatbot, telegram bot, conversational ai, knowledge base chatbot, customer support ai, openai api, anthropic claude api, gpt-4
One senior engineer, no hand-offs: agent logic, RAG layer, backend, frontend, deployment as a full stack ai developer
HOW WE START
Book a $50 consultation (my last 4 all turned into ongoing projects) or start with the AI Product Audit from my catalog. Tell me what you are building and I will be honest about the best way to ship it. Need an AI agent developer or AI SaaS developer who actually ships? Message me.
Steps for completing your project
After purchasing the project, send requirements so Volodymyr can start the project.
Delivery time starts when Volodymyr receives requirements from you.
Volodymyr works on your project following the steps below.
Revisions may occur after the delivery date.
API design & setup
We agree on endpoints, data models and auth. I set up the Node.js repo with TypeScript, Express or NestJS, and the database schema.
Build & test
I implement the endpoints or GraphQL resolvers, add validation, error handling and tests, and share a staging URL plus Swagger docs for you to try.