FastAPI

System Design

Jason Yang · 26 Mar, 2026

A practical Kafka testing strategy using Spring EmbeddedKafka and Python testcontainers. Learn how to test producers and consumers with real Kafka instead of mocks.

System Design

Jason Yang · 26 Mar, 2026

Implement a Kafka consumer in FastAPI with aiokafka: async processing, manual offset commit, error handling, and idempotency patterns for production.

System Design

Jason Yang · 26 Mar, 2026

Implement a Kafka producer in FastAPI with aiokafka (async-first): pydantic-settings, event schema design, lifecycle management, and production best practices.

Framework

Jason Yang · 23 Jan, 2026

Pydantic v2 settings give you type-safe, environment-driven config. Covers default, default_factory, and FastAPI integration best practices.

Programming Language

Jason Yang · 08 Jan, 2026

FastAPI vs Spring Core: how Python and Java differ on DI, singleton scope, resource lifecycle, and execution models — a practical developer comparison.

Programming Language

Jason Yang · 08 Jan, 2026

FastAPI dependency injection is a request-scoped resource engine, not just object passing. Covers lifecycles, dependency chains, testing, and clean architecture.

Programming Language

Jason Yang · 30 Nov, 2025

Pydantic vs dataclass: use Pydantic to validate incoming data, dataclasses for internal structures. Real examples and where each one breaks.

Cloud & DevOps

Jason Yang · 25 Nov, 2025

Publish private Python libraries to GCP Artifact Registry with Poetry: the critical publish-vs-install URL distinction that avoids 404s, plus auth tokens.

Programming Language

Jason Yang · 17 Nov, 2025

Manage FastAPI projects with Poetry: project setup, dependency locking, virtual environments, and testing — the full pyproject.toml workflow for teams.

Programming Language

Jason Yang · 17 Nov, 2025

Migrating Pydantic v1 to v2 in a FastAPI project? Here's the full v1→v2 checklist plus the validator, settings, and config changes that break.