Practical API engineering

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Hands-on guides for designing, connecting, testing, and debugging APIs — with real requests, code examples, and production-ready patterns.

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request.http 200 OK 
POST /v1/webhooks/events
Authorization: Bearer ••••••••
Idempotency-Key: evt_7f92a

{
  "type": "payment.completed",
  "data": {
    "id": "pay_42e8",
    "status": "succeeded"
  }
}
Signature verified 128 ms

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Design an API Structure endpoints, choose status codes, and implement pagination, versioning, and idempotency. Add authentication Implement API keys, OAuth 2.0, JWT, permissions, and secure token rotation. Handle webhooks Verify signatures, process retries, prevent duplicates, and debug failed deliveries. Connect a service Build reliable integrations with third-party APIs and external platforms. Build an SDK or client Create typed clients, generate SDKs, and design convenient developer interfaces. Test and debug requests Use mocks, contract tests, curl, Postman, and logs to find integration problems. Make integrations reliable Configure timeouts, retries, rate limits, queues, and circuit breakers. Observe API behavior Add structured logs, metrics, traces, request IDs, monitoring, and alerts.

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Webhooks

How to Verify Webhook Signatures Without Breaking Retries

Practical implementation notes, real requests, failure cases, and production-ready patterns.

Guide coming soon
API Design

Designing Idempotent POST Requests

Practical implementation notes, real requests, failure cases, and production-ready patterns.

Guide coming soon
Authentication

OAuth 2.0 Client Credentials Flow: A Practical Implementation

Practical implementation notes, real requests, failure cases, and production-ready patterns.

Guide coming soon

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Built for implementation,
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01Real requestsRealistic HTTP requests, responses, and payloads.
02Working codeExamples you can adapt to a real project.
03Failure casesCommon errors, edge cases, and unsafe choices.
04Production patternsSecurity, retries, logging, and monitoring.

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