Writings

ENGINEERING NOTES.

Short write-ups on the decisions behind my projects — design patterns, distributed systems, and the small API calls that save you later.

Jun 18, 20263 min read

A Coupon Engine That Scales: Strategy, Factory, and a Validator Chain

How I replaced a pile of if-statements with a small, testable discount subsystem in ByteBites — and why adding a new promo type is now a class, not a rewrite.

System DesignNode.jsDesign PatternsRead

Jun 11, 20262 min read

Stop Blocking on Payment Webhooks: Async Fulfillment with RabbitMQ

Chaining payment verification straight into order creation is fragile. Here's why I put a durable queue between them in ByteBites, and what it fixed.

Distributed SystemsRabbitMQBackendRead

Jun 2, 20262 min read

Serve TTS by Index, Not by Text: A Tiny API Decision That Closes a Cost Hole

PrepTalk's AI interviewer speaks out loud. The obvious endpoint would let anyone spend my TTS quota on arbitrary text. One small change fixed it.

AIAPI DesignSecurityRead