Fit Tech Case Study

CASESTUDY

System design case study for gym capacity tracking and slot booking. Three-part system (Fastify API, React Native mobile client, AWS CDK infrastructure) with clean separation between routes, services, and repository layers. Overbooking protection via a concurrency-safe booking mechanism, validated with a Jest test for race conditions under concurrent requests.

CONCURRENCY

Mutex-locked bookings, Jest race-condition test

INFRA

AWS CDK (IaC)

CACHING

ElastiCache, cache-aside, multi-region

DEPENDENCIES

FastifyTypeScriptReact Native (Expo)AWS CDK

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