I Built an ETL Platform Solo. 18 Phases, 1,400+ Tests, One Month

说明与用途

一名开发者在一个月内通过将项目拆分为18个短周期、严格执行TDD并采用分层架构，构建了完整的ETL平台，确保了系统的健壮性和可扩展性。

问题

Solo developers often struggle to build complete ETL platforms due to scope creep, lack of structure, and insufficient testing, leading to regressions and incomplete features.

结果

The solo developer delivered a production‑ready ETL platform in one month, achieving 1,424 tests, a clean layered architecture, and an open‑core plugin system, all while maintaining strict scope control and TDD discipline.

工作流

• Define 18 incremental phases with 1–3 day deliverables
• Implement each phase following strict TDD: write failing test, code, commit
• Use layered architecture: models, services, tasks, UI state, UI pages
• Integrate dlt for extraction, dbt-core for transformation
• Orchestrate with Celery and APScheduler
• Wrap UI in Reflex
• Add security tests for SQL injection, XSS, path traversal, auth attacks
• Implement public schema with org_id filtering for multitenancy
• Add hooks system for open‑core plugin architecture
• Run CI to catch regressions before PR review
• Iterate until phase 18 completes without breaking earlier phases

证据

I had 1,424 tests across 73 test files — covering models, services, tasks, security, end-to-end flows, and even multi-tenant isolation.

来源

Each phase had a clear deliverable and a short feedback loop. If I couldn't finish a phase in three days, the scope was wrong, not the timeline.

来源