At JoinJumbo, I engineered an atomic multi-currency wallet ledger handling 300M+ transactions, using batch SQL updates and UUIDv5 idempotency keys to eliminate double-spending.
I also extracted the identity layer into an AWS Lambda microservice handling 700k requests per minute, with a temporal cross-entity database locking algorithm to prevent identity-swapping fraud.
At Sportsdunia, I migrated 110K+ programmatic pages to Next.js App Router, contributing to a 4x increase in organic traffic. I also built a headless CMS with Server-Driven UI for web and mobile clients, used by 220+ cross-functional users.
I developed content-generation and translation pipelines that reduced editorial turnaround to 15 minutes per article, and improved MongoDB query latency by 90%. My work also included cache invalidation, version tracking, and real-time sports data pipelines.
