Engineering Work

Not screenshots. Systems with constraints, trade-offs, and consequences.

Case studies from a multi-tenant mobility platform — covering money, access, observability, fraud controls, and dispatch under time pressure.

1. 01

   Multi-Tenant Wallet & Payments Infrastructure

   From debugging silent payment failures to architecting a reconciliation-first wallet system across five payment providers.

   Payments / Ledger · 2023 — 2025→
2. 02

   Driver Promotions with Fraud Detection

   An incentive system designed on the assumption that users will try to game it — with geofence integrity enforced in SQL.

   Fraud / Spatial SQL · 2024→
3. 03

   Role & Permission Architecture

   One admin panel, many teams, none of whom should see the same things — with permissions as configuration rather than code.

   RBAC / Multi-tenant · 2025→
4. 04

   Ride Event Logs

   Every support ticket was an archaeology problem. A domain event stream that answers who did what, from where, and when — for rides nobody can reproduce.

   Observability · 2026→
5. 05

   Driver Dispatch Under Timeouts

   Finding a driver is a search problem with a clock on it — expanding rings, batched offers, and a retry loop for when the answer is 'not yet' rather than 'no'.

   Dispatch / Queues · 2025-2026→