API contracts and authorization
Endpoints need consistent request formats, useful error responses and documented pagination. Authentication identifies a caller; authorization decides which records or actions that caller may access. Versioning and compatibility rules help web and mobile clients evolve without unexpected breakage.
Data models and background work
Database design starts with the queries and consistency requirements of the product. Long-running tasks belong in background processing when blocking a request would create a poor experience. Retries, idempotency and failed-job visibility prevent a temporary error from creating duplicate work or silent data loss.
Integration and operational visibility
External integrations must cope with unavailable services, changed credentials and API limits. Tests should cover important business rules and failure responses. Logs, health checks and API documentation make it easier to deploy changes and diagnose production issues without exposing secrets.
What the scope can include
- Documented endpoints and access rules
- Database and background-job implementation
- Integration verification and deployment runbook
The final deliverables, schedule, ownership and maintenance terms are agreed for your project before implementation.
A relevant engineering reference
The CEO’s portfolio describes a multi-model platform with routing, debate workflows and usage-based billing. The reference is relevant to integrating model calls with application interfaces and account usage.
Explore MetaLLMPublic CEO portfolio reference. We will discuss which experience and components are relevant to your requirements.
Questions & answers
Can you improve an existing backend without a rewrite?
Often. Profiling, query improvements, clearer module boundaries and better job processing can address problems without a full rewrite. We inspect the current bottleneck and compatibility requirements first.
Do you deliver API documentation and tests?
Documentation and critical-path tests should be agreed deliverables. They explain authentication, requests, responses and errors, and verify the business behavior other systems depend on.