Sumit Kumar

About Sumit Kumar

Over 5 years of experience architecting high-performance, secure backend platforms— including nearly 2 years dedicated to fintech solutions—for enterprise SaaS, healthcare, and AI startups. Expert in TypeScript, Node.js, NestJS, PostgreSQL, MongoDB, Redis, and AWS (Lambda, Step Functions). I architect REST services with OAuth 2.0/JWT, enforce rate‑limiting and CORS policies, and drive system reliability to 99.99% uptime for globally distributed teams.Key achievements:• Fixerra FD Marketplace: 60% fewer signup steps & 25% higher conversions by re-architecting the entire financial-product flow. • Payment-grade Integrations: Standardized 30+ payment and banking APIs (OAuth 2.0-secured), reducing integration time by 40%.• 30% faster data retrieval: Optimized lambda functions & MongoDB queries for Trustana’s B2B platform.• 60+ hrs/month saved: Built cron and SQS automations for ERP and data pipelines.• 40% boost in recruitment throughput: Co‑developed GPT‑4 AI recruitment engine, automating candidate evaluation.• Received twice the Star Performance Award for exceptional project contributions at NTT DATA.• Awarded a public shout-out for exemplary ownership and reliability in managing new engagements at Leena AI by delivery and supply head of Primathon, significantly enhancing team standards and processes.I thrive in remote‑first environments, mentor junior engineers, and champion security‑first architectures. Always learning—open to scaling the next high‑growth startup.

Experience

1. Back End Engineer

   Trustana

   Jan 2025 — Present · SG

   Architected REST APIs in TypeScript/NestJS, achieving 99.99% uptime under peak B2B loads.• Scaled microservices with AWS Lambda & Step Functions; reduced cold‑start latency by 25%.• Optimized MongoDB schemas and queries—boosted throughput 30% and cut response times by 150 ms.• Mentored colleagues across India, Europe, and US teams—leading design reviews and pair‑programming sessions.

Education

• Kendriya Vidyalaya

  High School

• Maharishi Markandeshwar University, Mullana

  Bachelor of Technology