Provides a reusable pagination abstraction with sort normalization, limit clamping, and offset calculation. Self-contained and can be extracted into any Go web project.

Implements Server-Timing header collection for measuring and exposing server performance metrics. Demonstrates non-obvious skill in HTTP instrumentation and is reusable across Go services.

Defines a typed error hierarchy with HTTP status mapping, enabling consistent error responses across the API. This pattern is reusable for any Go service that needs structured error handling.

Provides safe body reading with memory limits and lenient JSON parsing. Useful for any HTTP service that needs to handle large or malformed request bodies without crashing.

Implements a Redis-backed session store with multi-instance support, suitable for distributed OAuth session management. Demonstrates a clean abstraction over Redis with TTL and atomic operations.

Provides a unified interface for multiple web search providers (Brave, Tavily) with fallback and configuration. Demonstrates the provider pattern and can be reused in any application needing web search integration.

Translates between OpenAI Chat Completions and Responses API formats, handling complex transformations like tool calls, streaming, and reasoning. This non-trivial protocol translation logic is reusable in any API gateway that needs to bridge different AI provider formats.