https://fel-mazo.com/en/blog/ Writing on backend architecture, API design, and the unglamorous decisions that keep systems running. en https://fel-mazo.com/en/blog/designing-api-boundaries-that-age-well/ https://fel-mazo.com/en/blog/designing-api-boundaries-that-age-well/ Most APIs start clean. The interesting question is what happens eighteen months later, when three teams depend on your endpoint and nobody remembers why that field is nullable. Mon, 30 Mar 2026 00:00:00 +0000