Independent Automotive Advisory Platform
A multi-role automotive advisory marketplace at 141K+ lines of production code.
Challenge
Independent automotive advice is a market with no neutral platform. Customers want a mechanic's opinion before a dealer touches the car; mechanics want a way to monetize expertise without running a shop; workshops want overflow demand. The platform had to bridge all three with consent-grade payment flows, scheduled sessions, and a compliance posture that closed enterprise workshop deals.
Approach
- 01
Designed a 4-role architecture — customer, mechanic, workshop, admin — with 100+ granular permissions enforced across the API surface.
- 02
Built a scheduled-session lifecycle from booking through join-state through payment release, with refund policy codified in code and SSOT'd for finance and ops.
- 03
Integrated Stripe with 40+ webhook event types, idempotent handlers, and reconciliation against the billing portal — zero critical payment incidents reported.
- 04
Built a 5-provider AI router (Claude, Groq, OpenAI, Cerebras, Anthropic) for diagnostic assistance with deterministic failover, claimed at 99.9% availability.
- 05
Shipped certification, brand-specialist filtering, exclusive-assignment logic, and a unified favorites system on top of the same SSOT.
Outcome
The platform consolidates a previously fragmented operating model into one product. Customers book and pay; mechanics deliver and get paid; workshops adopt the platform for overflow and certification. The engineering substrate handles thousands of concurrent users with sub-2-second loads.
The stack we used.
More work.
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