100mL
A gated procurement marketplace connecting vetted hotels with premium amenity, wellness, and lifestyle brands, built around a provable money path.
Wholesale hospitality buying still runs on email threads and PDF invoices, so no one can say with confidence what was ordered, what settled, and what each brand is actually owed.
- Modeled the money path as an append-only double-entry ledger with database-level balance constraints, so every debit, platform fee, and payout stays provable after the fact.
- Built the org, application, and order lifecycles as explicit state machines behind one guarded transition function instead of scattered status updates.
- Treated payment webhooks as untrusted input and reconciled them against the processor on a schedule, so intended state and actual state cannot quietly diverge.
- A repository-backed screenshot is included so the page shows a real product surface instead of relying on text alone.
- 3 implementation highlights spell out what changed inside the system.
- 0 solution lanes connect the project back to the broader archive of use cases.
A captured product surface is stored in the repo for this page.
Capability pages that describe the reusable system logic behind this work.
Website screenshot loaded automatically from the repository.
Writing that explains the architecture, constraints, or operating logic behind the project.
Usage-Based Intelligence: Building Scalable Billing Infrastructures
Billing is a distributed systems problem in disguise. Integrating real-time usage tracking with high-stakes intelligence signals.
How to Design an Idempotent Job Queue (Retries, Backoff, and Dead Letters)
At-least-once delivery makes idempotency mandatory, not optional. Here's how I design job queues that retry safely, back off with jitter, and dead-letter poison messages — with code.
What I Mean When I Say “Shipping Systems”
Shipping systems means shipping behavior under load, over time. A philosophical anchor for the operator-grade engineer.
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