At Delta Labs, I maintain a multi-engine Rails membership platform for a US motorsport association. I architected a deferred-payment subsystem that handles gateway captures, voids, refunds, and admin bulk charges.
I kept concurrent charge batches deadlock-free with PostgreSQL locks and gateway idempotency keys, and added a reconciler for ambiguous payment outcomes. I also hardened Sidekiq recovery after tracing silent job loss on dyno restarts.
At Delta Labs, I led Rails and database migrations and cut CI time with an RSpec shard planner. I also built Rails platforms for school district content and daily-deals vouchers, and rebuilt an industrial manufacturer site.
Outside that work, I built Mehngai Meter, a Pakistan economic intelligence platform using FastAPI and Next.js, and Seed Programming, an online course platform. I also taught SQL and database systems as a Lab Instructor at National University of Computer and Emerging Sciences, FAST.
