C#/.NET and PHP backends (REST/GraphQL), auth (HMAC/OAuth2), audit trails, and maintainable service layers.
Designing production-grade services in C#/.NET and PHP.
Interfaces: REST (JSON) and GraphQL, versioned and documented.
Security: HMAC/OAuth2, RBAC, input validation, rate-limiting, audit trails.
Architecture: DTOs → services → repositories, clear error contracts, background jobs.
Ops: Structured logging, health checks, CI/CD, and integration tests for safe releases.
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