Open to opportunities

Ujjwal Krishn Kumar

@ujjwalkrishnkumar

Message

I build high-scale backend platforms for payments, leaderboards, and real-time experiences.

India

Message

What I'm looking for

I'm looking to build resilient, high-scale backend and distributed systems where I can own critical platforms, solve performance challenges, and deliver reliable customer-facing experiences.

At Upgrad, I designed SuperUP's subscription billing and order-management platform for UPI AutoPay, integrating PhonePe Payment Gateway and powering 100K+ subscriptions. Previously at Dream11, I built leaderboard, watchparty, and readiness systems supporting high-volume fantasy sports traffic.

I've processed 40M+ winner records in under two minutes with Apache Spark, delivered APIs handling up to 1M+ RPM with low p99 latency, and built atomic Redis waitlist flows for real-time video watchparties. I also created a gamified 3D fan experience for Chennai Super Kings serving 2M+ users.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Upgrad

Jul 2026 - Present (1 month)

Designed a resilient subscription billing and order management platform for UPI AutoPay, integrating the PhonePe Payment Gateway with support for trial subscriptions, configurable billing cycles, and recurring payment orchestration. Implemented reliable subscription state management, currently powering 100K+ subscriptions.

PhonePe Payment Gateway Subscription Billing Order Management State Management

Software Engineer

Dream Sports

Oct 2024 - Jul 2026 (1 year 9 months)

Backend Engineer with 2 years of experience building and scaling distributed systems. Experienced in designing backend services end-to-end — from data modelling and API design to observability and production readiness — with a focus on reliability and performance at scale.
Have worked with these technologies - Java (Vert.x), MySQL, DynamoDB, Redis/Valkey, and Apache Spark.