You will get Backend Node.js Developer | NestJS API & Scalable Database Design
Top Rated
Top Rated
Project details
Your product is only as steady as the backend under it. If your API is slow, your data model is a mess, or you are scaling past what the current setup can take, that is what I fix.
I led a zero-downtime migration of a NASDAQ-listed company's ERP from legacy VB to Node.js/NestJS, and scaled a fintech product (StockPe) past 300K users.
WHAT YOU GET
✅ REST or GraphQL APIs built on Node.js / NestJS / Express
✅ Clean database design and indexing (PostgreSQL, MongoDB)
✅ Auth done right: JWT, OAuth, role-based access
✅ Caching, queues and background jobs (Redis, BullMQ, Kafka)
✅ Deployment, CI/CD and monitoring on AWS or DigitalOcean
✅ Readable, tested code your team can take over
WHY ME
Top Rated Plus, 100% JSS, 2,215+ hours, 12+ production apps shipped.
This is a monthly hire, not a quick gig. Book the Starter, tell me what you are building, and you get a clear plan and cost before any commitment.
I led a zero-downtime migration of a NASDAQ-listed company's ERP from legacy VB to Node.js/NestJS, and scaled a fintech product (StockPe) past 300K users.
WHAT YOU GET
✅ REST or GraphQL APIs built on Node.js / NestJS / Express
✅ Clean database design and indexing (PostgreSQL, MongoDB)
✅ Auth done right: JWT, OAuth, role-based access
✅ Caching, queues and background jobs (Redis, BullMQ, Kafka)
✅ Deployment, CI/CD and monitoring on AWS or DigitalOcean
✅ Readable, tested code your team can take over
WHY ME
Top Rated Plus, 100% JSS, 2,215+ hours, 12+ production apps shipped.
This is a monthly hire, not a quick gig. Book the Starter, tell me what you are building, and you get a clear plan and cost before any commitment.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$2,000
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 1 day | 20 days | 30 days |
Number of Revisions | 0 | 1 | 2 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
Frequently asked questions
4 reviews
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TS
Tony S.
Aug 2, 2026
“Looking for a full-stack Node.js/Next.js engineer with Docker + DevOps skills
Great communicator excellent results.
DS
Daniel S.
Jun 30, 2026
AWS PWA Development and Deployment Expert Needed !ONLY SOLO Freelancer!
Jaykumar understands requirements fast and delivers in excellent quailty. If that would not yet the peak, he is self driving sees improvement opportunities and is 100% result driven. Thanks Jay for our exceptional contribution and perfect delivery.
EG
Eugene G.
Sep 22, 2025
Node.js Expert with 5+ years experience
Great work!!!
FM
Fuad M.
Apr 7, 2025
React Site Updates
My react project was delivered much faster than expected with higher quality than asked for.
About Jaykumar
Senior Full Stack Developer | Node.js, NestJS, React, Next.js | AI
100%
Job Success
Ahmedabad, India - 9:28 am local time
I build complete web products and stay for the boring parts after launch. 20+ shipped apps across fintech, e-commerce, enterprise ERP, and AI SaaS. Most clients hire me because they do not want to stitch together a frontend person, a backend person, and an AI person.
🚀 What I build:
- Full-stack web apps and SaaS: Next.js and React front ends, Node.js or NestJS APIs, PostgreSQL or MongoDB, deployed on AWS, DigitalOcean, or Vercel.
- Backend and APIs: REST and GraphQL API development, authentication, microservices, background job pipelines with BullMQ and Redis, real-time features with Socket io and WebRTC.
- AI-native products: RAG and document chat, AI agents and multi-agent orchestration, OpenAI, Claude, and Gemini integrations, vector search, streaming AI responses, embeddable AI widgets.
- Payments and billing: Stripe, Stripe Connect marketplace payouts, subscriptions, usage and credit based billing, Razorpay, PayPal.
- Legacy rescue and migrations: modernizing old systems onto a current stack without taking the business offline.
🛠 Technical stack:
- Frontend: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, shadcn/ui.
- Backend: Node.js, NestJS, Express.js, Python, Laravel, REST APIs, GraphQL, microservices.
- Databases: PostgreSQL, MySQL, MongoDB, Redis, ClickHouse, Oracle, ChromaDB, Supabase.
- AI: OpenAI API, Anthropic Claude, Gemini, Vercel AI SDK, RAG pipelines, vector search, AI agents, Mem0.
- Cloud and DevOps: AWS (EC2, Lambda, S3, SQS, IVS), DigitalOcean, Vercel, Docker, CI/CD.
- Developer flow: Cursor Pro and Claude Code (Max plan) built directly into my daily work.
📊 Milestones and shipped work:
- High-traffic scale: run production systems handling 10M+ requests a day, with databases up to 7B+ rows, under long-term SaaS contracts.
- Cloud cost: cut server infrastructure cost by half with zero downtime (one DigitalOcean setup went from $1,600 to $700 a month), and reconfigured AWS SQS to drop monthly queue cost by 90%.
- Performance: cut API latency by 90% on a legacy platform that was buckling under load, from around 1.5 seconds to 50-150ms.
- KitchenCloud.AI: built the multi-agent orchestration layer routing to 6 specialized sub-agents with vector search and persistent memory, for an agentic AI kitchen assistant.
- Enterprise ERP migration: ran a zero-downtime legacy migration to NestJS, Next.js, and Oracle for a NASDAQ listed US corporation, leading the core backend integration team.
- StockPe: built on a fintech platform now serving 300,000+ active users that reached #2 Product of the Day on Product Hunt.
- E-commerce and apps: shipped live applications on the Shopify App Store (including Aura AI) using the GraphQL Admin API and custom search architectures.
On Upwork I am Top Rated with 100% Job Success and 2,260+ hours billed, and every review so far is 5 stars. One client put it as "delivered much faster than expected with higher quality than asked for."
I am available now for 30 to 40 hours a week, I overlap with US and EU hours, and I reply the same day. If you want, send me your idea or your existing repo and I will tell you honestly what it needs before you hire anyone.
Let's build something that works in production, not just in a demo.
Steps for completing your project
After purchasing the project, send requirements so Jaykumar can start the project.
Delivery time starts when Jaykumar receives requirements from you.
Jaykumar works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery and architecture
We get on a call, I map your data model, API surface and scaling needs, then send a written plan, timeline and cost.
API and data layer
I build the core APIs (REST or GraphQL), schema and auth (JWT/OAuth, role-based access) with clean, tested code.