Manish Kumar — Software Engineer

I build backend systems that handle real money at scale. At Nupipay, I engineer payment infrastructure processing $500K+ monthly across UPI, NEFT, IMPS, and wallet payouts, serving 50+ enterprise clients including LIC and Airtel Payment Bank. When I joined, transaction success rates sat at 80%. I architected a multi-gateway fallback system with 3+ providers and intelligent failure routing. we now run at 99% success rate, cutting failed transactions by 40%. That's not a line on a resume. That's real money not lost. Beyond payments, I've built: → Rule Engine microservice: 10,000+ daily calculations, saved 30 hrs/week, $500K+ revenue impact → 3-provider eKYC pipeline: 99% uptime, 5,000+ daily verifications, 75% less manual review → AI Production Support Assistant: NestJS + pgvector + BullMQ, RAG architecture, LLM-powered root cause suggestions Before Nupipay, I built an AI video generation platform at Storeprops, 50+ Shopify merchants, 50,000+ monthly renders, cut response time from 800ms to 200ms, saved $1,200/month in infra costs via Redis caching and serverless FFmpeg + AWS Lambda pipeline. TECHNICAL SKILLS: Backend: Node.js · NestJS · Express.js · Spring Boot · TypeScript · JavaScript · Java Frontend: React.js · Next.js Databases: PostgreSQL · MongoDB · Redis · pgvector Cloud & DevOps: AWS (EC2, S3, Lambda, SQS, RDS, CloudFront) · Docker · Jenkins · CI/CD APIs & Tools: GraphQL · RESTful APIs · Prisma · TypeORM · BullMQ · Socket.io · Git · Postman Outside work: LeetCode Knight, Top 2.28% globally, 2000+ rating, AIR 33 in Biweekly Contest 127, 700+ day streak. Also built SocialCircle: 10,000+ DAU, 1,000+ concurrent users, real-time feed via Socket.io and Redis pub/sub. Open to backend-heavy or full stack roles at product companies in fintech, payments, SaaS, or AI domains. open to relocate pan india, open to remote. 📩 manish80842@gmail.com 🌐 manishk4514.vercel.app 💻 github.com/ManishK4514

Stackforce AI infers this person is a Backend-heavy Fullstack Engineer specializing in Fintech and SaaS solutions.

Location: Mumbai, Maharashtra, India

Experience: 2 yrs 11 mos