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03 Live 2025
ServiceHub — Auto-Workshop Platform
Auto-workshop management — service orders, VIN decoding and automatic SMS.
AutomotiveField servicePWAMulti-tenant SaaS
Context
Auto workshops juggle service orders, vehicles, customers and appointments — usually on paper or in Excel. They needed a fast, multi-tenant system that works from the phone on the shop floor and notifies customers automatically.
What I built
- ServiceOrder as a state machine, with VIN decoding (NHTSA + manual ISO 3779 fallback) and ANAF company (CUI) lookup.
- Installable PWA — runs like a native app on the shop-floor phone.
- Service-dossier, customer and vehicle management, with per-shop multi-tenant isolation (EF Core global query filters).
Technical highlights
Timing-attack-resistant auth
a PBKDF2 dummy hash equalizes response times whether or not the user exists — no leak through timing.
Automatic SMS, reliable delivery
an SMS queue with lease/claim and a stuck-item sweeper; an NSSM agent (a Windows service) on a shop PC drains the queue and sends via the Huawei modem — no external SMS gateway (the agent API is authenticated + rate-limited).
VIN decoding with fallback
NHTSA as the primary source, with manual ISO 3779 decoding when the API is unavailable.