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Backend developer in Crystal — fast APIs on Kemal and Lucky

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Listing period7 daysuntil 20.11.2026
Posted22.08.2026
Views980 in 14 days

About the service

I develop backends in Crystal — a language that reads almost like Ruby but compiles to one fast native binary. If you love expressive syntax but need real throughput, that's exactly my area. Over the last four years I've shipped dozens of APIs, background processors and internal tools to production on the Kemal microframework and the more complete Lucky stack, so I pick the tool to fit the problem rather than forcing one shape onto everything. For lightweight JSON APIs I use Kemal: routing, middleware and tiny footprint, startup in milliseconds. For structured applications with typed actions, migrations and server-side rendering I use Lucky, where the compiler catches broken routes and missing parameters before deployment. A typical delivery includes documented REST or JSON endpoints, PostgreSQL schema with migrations, authentication and token handling, request validation and a suite of specs. I package the build in a container, so deployment is one small image, and structured logs plus health-checks let you observe the service in production. Since Crystal is statically typed and compiled, whole classes of runtime surprises simply don't happen, and the binary maintains high concurrency on modest hardware. Send me a list of endpoints, data model and target latency — I'll give honest estimates and a working piece you can run yourself from the start. I care about clean code, readable specs and handoff notes so your team can move forward without me.

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