Backend Developer Builds the Systems You Never Have to Think About
From Warszawa, Daniel R Lessor designs APIs, data pipelines and distributed services that stay quiet, fast and correct, even when traffic is not.
Daniel R Lessor is a backend developer who has spent the better part of a decade building the parts of software that users never see but always feel: the APIs that answer in milliseconds, the databases that never lose a row, and the background workers that quietly process millions of jobs a day.
Working mainly in Go, Python and Java, Lessor specialises in service design, relational data modelling and event-driven architecture. Colleagues describe an engineer who reads query plans for pleasure and treats observability as a first-class feature rather than an afterthought.
His work spans fintech, logistics and SaaS platforms, where he has led migrations from monoliths to well-bounded services, introduced contract-first API design with OpenAPI and gRPC, and cut cloud costs by right-sizing infrastructure on Kubernetes and AWS.
Beyond the code, Lessor is known for mentoring junior engineers, running blameless post-mortems, and writing the kind of documentation that turns a two-week onboarding into two days. He is currently open to new backend and platform engineering roles, remote or in Warszawa.
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