Headline

Backend / Software Development Engineer | Node.js · TypeScript · MongoDB · Redis | Building auth & payment infra @ SwapSo | AI & Data Science @ TCET | 600+ DSA

About

Backend-focused Software Engineer building production systems — authentication, payments, and event-driven infrastructure — on Node.js, TypeScript, MongoDB, and Redis. I'm a B.Tech AI & Data Science student (CGPA 8.6/10) at TCET Mumbai with 3 internships and 3 shipped products across fintech, govtech, and healthtech. I care about writing backend systems that hold up under real traffic: idempotent flows, secure auth, caching, rate limiting, and clean API design. What I'm working on now (SwapSo): - OTP authentication backend with TTL-based expiry, rate limiting, CAPTCHA, and retry/fallback logic. - A provider-abstracted gift-card rewards integration for a crypto wallet — event-driven webhook processing with HMAC-SHA256 verification, an idempotent USDC cashback engine, and AES-256-GCM encryption. - Production setup with Redis caching, MongoDB Atlas, and connection pooling. A few things I've built: - JanSetu — a real-time voice-to-map disease reporting pipeline (Python NLP + Node.js + Google Maps + Twilio) that cuts HQ reporting delays from days to seconds. - Adzap — a full-stack ad platform with RBAC, AI creative generation (75% faster production), and an ETL analytics dashboard that improved campaign ROI tracking by 50%. - Gov Assist — a Chrome extension that matches user documents against government schemes (92% accuracy) and auto-fills applications. Beyond code: 4x hackathon winner, SIH institute-level finalist, and Technical Head at GDSC TCET, where I led workshops for 200+ student developers. 600+ DSA problems solved. I'm open to Backend / SDE roles, internships, and collaborations. Let's build something that works at scale. 📫 sumitharisingh@gmail.com | +91 85916 18604 🔗 GitHub: github.com/sumitsingh24k

Location

Mumbai Metropolitan Region

AI stack

antigravity

claude code

claude

gemini

langchain

openai

Work experience

Software Engineer at SwapSo, May 2026 - Aug 2026 · 4 mos, Mumbai, Maharashtra, India, Backend & full-stack engineering for fintech products — authentication, integrations, and scalable services. - Built an OTP authentication backend (Node.js, TypeScript, MongoDB, Redis) with TTL-based expiry, rate limiting, CAPTCHA, and retry/fallback logic — reducing DB load and improving verification response time under traffic spikes. - Architected a provider-abstracted gift-card rewards integration for a crypto wallet: event-driven webhook processing with HMAC-SHA256 verification, an idempotent 1.25% USDC cashback engine, AES-256-GCM encryption, and 400+ brand catalogue sync — a reusable integration pattern across reward providers. - Configured Redis caching, MongoDB Atlas, and connection pooling for production-scale deployment; shipped the React Native catalogue/voucher UI. Tech: Node.js, TypeScript, Express.js, MongoDB, Redis, React Native

Joint Technical Head at GDSC TCET, Sep 2025 - Jul 2026 · 11 mos, Mumbai, Maharashtra, India, - Designed and delivered technical workshops and live demos for 200+ student developers, adapting explanations of complex topics for mixed-skill audiences. - Lead technical direction and developer community initiatives on campus.

Software Engineer at The Sibling Corp, Sep 2025 - Dec 2025 · 4 mos, Mumbai, Maharashtra, India, Built Quick Basket — a farmer-to-consumer marketplace that eliminates supply-chain middlemen and improves farmer revenue margins. - Designed and shipped the platform end-to-end (Node.js, Express.js, MongoDB, React Native), launched on Android and iOS. - Architected scalable REST APIs, data models, and schemas for order management; owned the full feature lifecycle from client requirements through design, build, and mobile deployment. Tech: Node.js, Express.js, MongoDB, React Native

Frontend Developer at Growigh, Jul 2025 - Sep 2025 · 3 mos, Gwalior, Madhya Pradesh, India, - Built a fully responsive React.js landing page integrated with backend REST APIs — improved Lighthouse score from 64 to 91/100 via code splitting and asset optimization. - 40% faster load time and 25% higher average session duration post-launch. - Ensured cross-browser compatibility and responsiveness across desktop, tablet, and mobile. Tech: React.js, HTML, CSS, JavaScript, REST APIs

Problem Setters at TCET Shastra-Coding Club, Oct 2024 - Jul 2025 · 10 mos, Mumbai, Maharashtra, India, - Designed competitive programming problems for inter-college contests.

Education

Bachelor of Technology - BTech, Artificial Intelligence and Data science, Thakur College of Engineering & Technology Shaymnarayan Thakur Marg Thakur Villaige Samata Nagar Kandivli (E) Mumbai 400 101

12th, Computer Science, Thakur College of Science & Commerce

Public links

github: https://github.com/sumitsingh24k

leetcode: https://leetcode.com/sumit24k

sumitttt.vercel.app: https://sumitttt.vercel.app/