Elio Capella Sánchez's blog Practical engineering lessons from building software and teams. https://eliocapella.com/ 2026-07-21T00:00:00+02:00 Elio Capella Sánchez https://eliocapella.com/ From One Engineering Team to Autonomous Squads https://eliocapella.com/blog/scaling-engineering-squads/ 2026-07-21T00:00:00+02:00 2026-07-21T00:00:00+02:00 How we scaled Filestage engineering from one team into autonomous squads with clear ownership and safe technical foundations. Communicating Bad News With Clarity https://eliocapella.com/blog/communication-in-hard-times/ 2026-06-12T00:00:00+02:00 2026-06-12T00:00:00+02:00 Practical lessons for communicating layoffs and other bad news with honesty, clarity, and respect. Fair background file processing https://eliocapella.com/blog/fair-background-file-processing/ 2026-06-06T00:00:00+02:00 2026-06-06T00:00:00+02:00 How fair per-user scheduling stopped large upload batches from monopolizing a shared processing queue. AI Slop Proof https://eliocapella.com/blog/ai-slop-proof/ 2026-03-12T00:00:00+01:00 2026-03-12T00:00:00+01:00 Guardrails for keeping AI-generated code readable, reliable, performant, observable, and safe to ship. Writing Good Unit Tests https://eliocapella.com/blog/writing-good-unit-tests/ 2026-01-23T00:00:00+01:00 2026-01-23T00:00:00+01:00 Test behaviors instead of implementation details, and mock only at system boundaries. How We Built AI-Powered Review at Filestage https://eliocapella.com/blog/ai-powered-review-filestage/ 2026-01-09T00:00:00Z 2026-01-09T00:00:00Z How we shipped AI-powered text and image review in under a month without custom models, GPUs, or new infrastructure. Permission Systems for Enterprise that Scale https://eliocapella.com/blog/permission-systems-for-enterprise/ 2025-12-12T00:00:00+01:00 2025-12-12T00:00:00+01:00 How write-time permission precomputation makes complex enterprise authorization fast at read time. Migrating 6000 React tests using AI Agents and ASTs https://eliocapella.com/blog/ai-library-migration-guide/ 2025-11-21T00:00:00Z 2025-11-21T00:00:00Z How AI agents, codemods, and a careful migration guide moved 6000 React tests to a new library version. Simple JavaScript Toolkit https://eliocapella.com/blog/simple-js-toolkit/ 2025-11-14T00:00:00+01:00 2025-11-14T00:00:00+01:00 Applying simple-system principles to JavaScript through values, data, controlled state, and explicit rules. How I Build Engineering Culture https://eliocapella.com/blog/engineering-culture/ 2025-10-10T00:00:00+02:00 2025-10-10T00:00:00+02:00 How kindness, pragmatism, reliability, transparency, and simple architecture shape a productive engineering culture. Vendor lock in nightmares https://eliocapella.com/blog/vendor-lock-in-nightmares/ 2025-08-22T00:00:00+02:00 2025-08-22T00:00:00+02:00 Lessons from painful vendor migrations involving Transloadit, Auth0, and MongoDB Atlas. Fighting free trial abuse https://eliocapella.com/blog/fighting-free-trial-abuse/ 2025-07-22T00:00:00+02:00 2025-07-22T00:00:00+02:00 What worked and failed while protecting an open SaaS trial from spam and misuse. Measure what matters https://eliocapella.com/blog/measure-what-matters/ 2025-07-13T00:00:00+02:00 2025-07-13T00:00:00+02:00 How satisfaction, merged pull requests, technical tickets, and impact metrics reveal engineering-team bottlenecks.