API Contracts
& Client Workflows
The authoritative reference for designing robust API endpoints, generating type-safe clients, and managing automated integration workflows at scale.
Contract-First. Production-Ready.
This site provides deep-dive guidance for backend engineers, API architects, and platform teams who build and consume APIs at scale. Every pattern here is grounded in real-world production concerns — versioning, type safety, retry semantics, and automated SDK generation.
From Design to Client
We cover the full API lifecycle: modeling resources with clean HTTP semantics, defining immutable OpenAPI contracts, generating type-safe clients via CI pipelines, and mapping every failure mode to an explicit, machine-readable error contract.
Patterns Across Languages
Examples span TypeScript, Node.js, Go, Python, and YAML-based OpenAPI specs. Whether you're building REST endpoints, configuring retry policies, or implementing cursor-based pagination with PostgreSQL, you'll find production-grade patterns here.
Explore the Guides
Three focused sections covering every aspect of API contract design.
API Design Fundamentals & Architecture
Resource modeling, HTTP method semantics, idempotency key patterns, stateless authentication flows, and contract-first OpenAPI lifecycle design.
Explore sectionError Contracts & Resilience Mapping
RFC 7807 Problem+JSON, HTTP status code classification, retryable vs non-retryable errors, exponential backoff, circuit breakers, and client fallback strategies.
Explore sectionQuery Patterns & Data Shaping Strategies
Cursor vs offset pagination, advanced boolean filtering, multi-field sorting, sparse fieldsets, and adding query contract support to OpenAPI specifications.
Explore section