Tarun Choudhary

Full Stack Engineer @Builder Monkey

Ex-Full Stack Developer @75 Way Technology

Ex-Full Stack Developer Intern @Sheriyans Coding School

About

Full Stack & Mobile Engineer with production experience building and deploying complete SaaS platforms, cross-platform mobile apps (iOS & Android), and cloud infrastructure using Next.js, React Native, NestJS, PostgreSQL, Redis, and Docker.
Shipped AtFenix (Enterprise Cloud IaaS & Customer Portal at one.atfenix.com) and FixCars.ai (AI Automotive Diagnostics on Web, iOS, and Android) serving 500+ active users.
Proven track record optimizing platform performance: reduced API latency by 50% through Redis connection pooling, distributed caching, and query optimization; cut dashboard load times by 52% through BullMQ tuning and k6 load testing.
Architected fault-tolerant systems using distributed Redis locks, async BullMQ workers, transactional rollback, idempotent payment workflows, and automated resource cleanup.
Resolved critical production incidents including Redis connection storms, duplicate billing, and orphan VM states.
Deep hands-on experience building AI/LLM applications with LangChain, LangGraph, RAG pipelines, vector search (Pinecone), and Gemini API.
B.Tech in Computer Science Engineering (AI & ML) with strong grounding in software engineering principles, automated testing (Jest, Playwright, k6), and CI/CD pipelines.

Shipped AtFenix (Cloud IaaS & Customer Portal at atfenix.com / one.atfenix.com) and FixCars.ai (AI Diagnostics on Web, iOS, and Android) serving 500+ active users.
Led end-to-end development using Next.js, React Native (iOS & Android), NestJS, Node.js, and CI/CD pipelines.
Reduced API latency by 50% through Redis connection pooling, distributed caching, and query optimization.
Improved dashboard load time by 52% through BullMQ tuning and k6 load testing.
Architected fault-tolerant systems using distributed Redis locks, async BullMQ workers, transactional rollback, and automated resource cleanup.
Resolved Redis connection storms, duplicate billing, and orphan VM issues.
Engineered secure Cashfree payment workflows with idempotent verification and webhook validation.
Developed 50+ automated tests across unit, integration, security, and E2E suites.

Built and deployed MERN and Next.js applications for client production environments.
Implemented secure authentication, REST APIs, LangChain-powered AI workflows, and WebSocket real-time communication.
Designed responsive, performance-optimized user interfaces with modern React state management and structured error handling.