Crystal Backend Engineer — Blazing-Fast APIs with Kemal & Lucky

I write backend services in Crystal, the language that reads almost like Ruby yet compiles to a single fast native binary. If you love expressive syntax but need real throughput, this is exactly where I live. Over the past four years I have shipped production APIs, background workers and internal tools on top of the Kemal micro-framework and the fuller Lucky stack, so I can match the tool to the size of your project rather than forcing one shape onto everything. For a lean JSON API I reach for Kemal: routing, middleware and a small footprint that boots in milliseconds. For a structured application with typed actions, migrations and server-rendered pages I lean on Lucky, where the compiler catches broken routes and missing params before anything ships. Typical deliverables include a documented REST or JSON endpoint set, a PostgreSQL schema with migrations, authentication and token handling, request validation, and a suite of specs. I containerize the build so deployment is a single small image, and I set up structured logging and health checks so you can watch the service in production. Because Crystal is statically typed and compiled, whole classes of runtime surprises simply never happen, and the binary handles high concurrency on modest hardware. Tell me your endpoints, your data model and your latency target, and I will give you an honest estimate plus a working slice you can run yourself early. I care about clean code, readable specs and handover notes, so your team can keep moving after I step away.