At StonksAI, I integrated Razorpay and RevenueCat with a unified backend entitlement service, bringing webhooks and receipt validation into one subscription state source. I also built real-time pipelines for three content feeds and a distributed scheduler for recurring background tasks.
At Slice, I developed UPI Rewards and built a referral incentive product with concurrent request handling, idempotency, and fraud prevention; user onboarding increased by 150%. I also replaced polling with MQTT, cutting API calls by 90%, and developed an end-to-end NPS platform that improved the Google Play rating from 3.3 to 4.5.
