Problem

Backend systems often bolt on auth and validation as afterthoughts, making security regressions hard to audit.

Challenge

Designing auth and authorisation boundaries that are correct by default, without burdening future developers with hidden assumptions.

Solution

Built a security-focused backend with layered auth, input guardrails, and explicit error handling. Every access decision is traceable, and safe defaults are enforced at the system boundary.

Impact

Produced a production-style codebase reviewers could audit end to end. No hidden trust, all access paths documented, and security decisions explicit.