Sujay Singh
Full Stack Engineer — React/Next.js + Python
Full-stack developer based in Noida, India with 4.5 years of hands-on experience (3.3 years relevant) shipping production software. 20+ websites delivered with consistent 98+ Lighthouse scores, plus SaaS platforms covering RBAC, secure checkouts, and custom CMS builds. React & Next.js specialist with hands-on Python, FastAPI, and PostgreSQL experience, now extending into GenAI application engineering — RAG, embeddings, vector search, LangChain, and LangGraph.
Experience
The First Real Job
Apr – Aug 2022JavaScript Developer (Trainee) · MoJoBoxx · Gurugram
Learned to ship code inside a team and debug under deadline pressure. Built responsive, mobile-first interfaces with HTML5, CSS3, JavaScript, and jQuery, and wired REST APIs via AJAX so pages updated without full reloads.
3 Years at Scale
Sep 2022 – Nov 2025Frontend Developer · KALP Digital / MAI Labs · Noida
20+ websites and full SaaS platforms — RBAC, secure checkouts, custom CMS. Migrated a legacy React frontend to a modular TypeScript architecture with Redux Toolkit, built a Tailwind design system that cut feature-development time by 30%, pushed Lighthouse from 75 to 98+ with SSR/ISR, and mentored 4 junior developers.
Going Freelance
Nov 2025 – PresentIndependent Fullstack & GenAI Engineer
Took the leap into freelancing after Kalp. Delivered Trikaya.io — an AI + Blockchain hiring platform — and a high-conversion landing page, expanded into React Native, then built and deployed an AI-powered blog platform (Next.js, FastAPI, PostgreSQL) with JWT auth, RBAC, and LLM-assisted content generation.
The Backend Chapter
Dec 2025 – Mar 2026Node.js · Express · PostgreSQL · Prisma · Docker · Railway
Decided the frontend alone wasn't enough. Dove headfirst into backend — built a production REST API from scratch: JWT auth, relational schema with Prisma, middleware validation, and full Swagger docs. Containerised with Docker and deployed live on Railway.
The Next Frontier
2026 – PresentPython · FastAPI · GenAI Engineering
Earned PCEP certification and now actively building with Python and FastAPI — full-stack CRUD APIs, SQLAlchemy ORM, JWT auth, and Docker. Alongside that: GenAI apps — RAG pipelines with embeddings and FAISS vector search, orchestrated with LangChain and LangGraph. The goal: end-to-end intelligent systems, not just interfaces.
Education
B.Tech in Computer Science
2015 – 2019RKGEC, Ghaziabad · AKTU
Raj Kumar Goel Engineering College, under Dr. A.P.J. Abdul Kalam Technical University. Built first real projects, broke everything, stayed up fixing it. Learned that persistence outlasts talent every time.
Skills
Selected Projects
Trikaya.io — AI + Blockchain Hiring Platform
View →Built the complete frontend for a platform connecting students with Web3, Data Science, and Cybersecurity careers. Architected for scale with Next.js SSR, real-time job listings, mobile-first design, and structured metadata for SEO. Every page loads fast. Every click feels instant.
20+ Campaigns — Marketing Sites & Landing Pages
High-velocity delivery across 20+ distinct marketing websites and landing pages. Diverse brands, tight deadlines, consistent quality. Each site responsive at every breakpoint, optimized for conversion, and shipped fast. Performance was never optional — every page passed a Lighthouse audit before launch.
Employee Management API — REST API — Fullstack Backend Build
View →First major backend project — a production-grade REST API built entirely from scratch. Full CRUD operations across employees, departments, and roles. JWT auth with refresh token rotation, middleware-driven validation, relational schema with Prisma ORM, and Swagger docs for every endpoint. Deployed live on Railway.
AI-Powered Blog Platform — Next.js + FastAPI · RBAC · GenAI
A full-stack blog management platform — Next.js frontend, FastAPI + SQLAlchemy backend on PostgreSQL. Secure JWT authentication with role-based access control (Admin, Editor, Reader), admin workflows, CRUD content management across posts, categories, and comments, and LLM-assisted content generation for drafting posts. Built and deployed end to end.
RAG PDF Chat — Ask Questions of Any Document
Upload a PDF, ask in plain language, get answers grounded in the document. Built the full retrieval pipeline in Python with LangChain — document loading, text chunking, embeddings, FAISS vector search, and contextual retrieval — feeding an LLM (OpenAI / Gemini) so responses stay tied to the source.
TestKart — EdTech Marketplace — Frontend
Frontend for an EdTech marketplace where teachers and coaching institutes create and sell mock tests, courses, and study material, while students discover and buy resources, attempt tests, and track performance for competitive exams. SSR and SEO optimization, REST API integration, authentication flows, and responsive dashboards for students, educators, and admins.