Available for freelance & full-time — Kolkata, India (IST)
Senior Full-Stack Engineer specialising in Node.js · React · Next.js — architecting fast, scalable, production-ready web systems since 2014.
Node.js APIs & Microservices
High-throughput REST & GraphQL backends built for scale.
React & Next.js Front-Ends
SSR, ISR, edge-ready UIs with pixel-perfect design systems.
TypeScript-First Architecture
Type-safe, maintainable codebases that teams love to extend.
Trusted by startups & agencies across India, the UK, and the US
The story behind the engineer.
Feature 01
I started writing Node.js scripts in a cramped apartment in Kolkata back in 2014 — fascinated by the idea that a single JavaScript runtime could power both a sleek front-end and a battle-tested back-end. Ten years later, that curiosity has become a career. I've worked with early-stage startups, mid-size agencies, and enterprise teams across India, the UK, and North America — always remotely, always asynchronously, always on time.
Feature 02
My progression wasn't linear — it was deliberate. I moved from writing jQuery spaghetti to building type-safe React component libraries. From monolithic Express apps to event-driven microservices with RabbitMQ and Redis. Each project taught me that the best code isn't just code that works — it's code that the next engineer can read at 2 AM without crying. That philosophy drives every PR I open.
Feature 03
I believe software should be boring in the best possible way — predictable, observable, and easy to change. I write tests before I ship. I document APIs before I push. I open PRs that reviewers want to approve. Whether it's a greenfield SaaS product or a performance overhaul of a legacy monolith, I bring the same rigour: clear communication, realistic timelines, and code you'll be proud of in two years.
RESTful & GraphQL APIs, microservices with event queues (RabbitMQ, Redis Pub/Sub), real-time features via Socket.io — built to handle millions of requests.
Complex SPAs, design systems, Context + Zustand state management, performance budgets, and WCAG-compliant component libraries.
SSR, ISR, App Router, edge middleware, image optimisation, and Lighthouse 100 scores — the full Next.js playbook.
Strict mode. Generics. Utility types. Discriminated unions. Type-safe codebases that scale across teams without type-any shortcuts.
Relational schema design, query optimisation, indexing strategies, aggregation pipelines, and Prisma/Mongoose ORM layers.
Docker, GitHub Actions, Vercel, AWS EC2/S3/Lambda, zero-downtime deploys, environment parity, and structured logging with Datadog.
From idea to deployment — here's where I add the most value.
Full-stack React + Node.js apps with real-time capabilities, authentication, and cloud deployment — built to grow.
Versioned REST & GraphQL APIs with OpenAPI docs, rate limiting, JWT auth, and webhook systems your partners will love integrating.
Custom storefronts on Next.js with headless Shopify or Stripe Checkout — fast, SEO-optimised, and conversion-focused.
Multi-tenant architectures, subscription billing, role-based access control, and onboarding flows — the full SaaS foundation.
Lighthouse audits, Core Web Vitals triage, database query profiling, and bundle analysis — I find the bottlenecks and fix them.
Architecture reviews, tech-stack decisions, code reviews, and mentoring for your in-house team — strategic advice when you need it most.
First professional role at a Kolkata-based agency — building REST APIs with Express.js and learning the hard lessons about production databases.
Fell headfirst into the React ecosystem. Built complex SPAs for fintech and ed-tech clients. Discovered the power of a well-designed component library.
Led a team of 4 engineers building a multi-tenant SaaS platform from scratch — microservices, Docker, AWS, CI/CD pipelines. First taste of architecture ownership.
Went independent. Adopted Next.js as primary framework. Delivered SSR-first projects for clients in the UK and US with measurable SEO and performance gains.
Partnering with startups and agencies as lead engineer or fractional CTO — architecting systems, shipping code, and raising the bar for engineering culture.
“Sandeep delivered our entire API platform in six weeks — on spec, on budget, and with documentation so thorough our in-house team could immediately extend it. Genuinely one of the best engineers I've worked with in 12 years of building software products.”
James Whitfield
CTO, Velocita Labs (London, UK) · Velocita Labs
“We hired Sandeep for a 'quick performance audit' and he ended up cutting our page load time by 68% and our cloud bill by 40%. His knowledge of Next.js internals and database optimisation is exceptional. He communicates clearly, works independently, and never misses a deadline.”
Priya Mehta
Product Lead, FinTrack India · FinTrack India
“Working across time zones with a remote engineer can be nerve-wracking — not with Sandeep. His async communication is impeccable. He asks the right questions upfront, then executes with precision. The React design system he built for us is now used across three products.”
Rachel Torres
Founder, NovaSpark Studio (Austin, TX) · NovaSpark Studio
Communication
Code Ownership
Response Time
Stack Depth
Pricing
No hidden fees. No scope creep surprises. Just honest, professional engineering.
Custom Quoteper project
₹1,20,000per month
₹8,000per hour
I'm available for freelance projects, monthly retainers, and consulting engagements. Based in Kolkata (IST) — responsive within 24 hours. Drop me a message and let's talk about what you're building.
Fill in the form below and I'll get back to you within 24 hours (IST, Monday–Friday). The more detail you share about your project, the more useful my first response will be.