Developer Documents Building FoxyInvoice SaaS in Open, Sharing Real Costs and Incidents

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A developer is publishing an open, chapter-by-chapter series detailing how they built and operate FoxyInvoice, a live multi-tenant invoicing SaaS at foxyinvoice.com. The series covers the full technical stack — Angular, .NET, PostgreSQL, Docker, and Caddy — explaining why each component was chosen for production reliability. Real postmortems, actual monthly cost breakdowns, and Stripe fee analysis are included rather than idealized success narratives. The project is run by a single person with no dedicated DevOps team, deploying via a CI pipeline that takes roughly eight minutes from code push to live. Chapter 1 is set to cover foundational prerequisites, with all chapters and diagrams made publicly available in a repository.

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