Writing
Practical notes from building production APIs, background processing, and data-driven product features.
PETPET · Search and product variants
A result might be one size of a product, while the app needs to show the whole family. I moved that repeated grouping work into a compiled read model.
October 30, 2026 · 5 min read
PETPET · Event processing
How I moved shopping activity through Pub/Sub, made duplicate deliveries safe, and kept a MongoDB recovery path for publish failures.
October 30, 2026 · 5 min read
PETPET · Vouchers and checkout
What I changed after two different races showed up in one feature: competing for campaign stock and two orders trying to spend the same voucher.
October 30, 2026 · 7 min read
PETPET · Recommendations
The request used to rank products before it could answer. Here’s how moving that work to background workers brought the response down while keeping product details fresh.
October 30, 2026 · 4 min read