Engineer and founder.

Career story

I'm Ivan Sapronov, a backend and fullstack engineer in Prague. I've spent about five years building and scaling enterprise web applications and services, mostly on the JVM (Java, Kotlin, Spring), plus the Angular frontends, cloud infrastructure and identity systems around them.

My first freelance Java project, in 2021, was a CRM with an admin panel and the analytics services behind its React dashboards. Ableneo came next, and the problems got more distributed: Redis caching and reactive services with Spring WebFlux, Keycloak for SSO and CIAM, Kafka with custom connectors, Dockerised services on Kubernetes, and Grafana, Prometheus and InfluxDB to watch it all in production.

At CCA Group I owned both sides of the stack: a dynamic form engine in Angular that cut the time to create a new form type from days to hours, and the Java services behind it. I moved some of those services to Kotlin coroutines, which roughly halved p95 latency under peak load. Then, at NCR Voyix, I designed backend-for-frontend and aggregator services for a system serving around two million users, built a self-service Angular platform for US clients, ran services on GCP with full observability, and started using LLM and agentic tooling to take the routine out of engineering work.

Most recently I spent three months at CreativeDock building Kotlin/Spring Boot microservices from scratch and fixing the GitLab CI and Argo CD plumbing around them. Right now I'm building Ownira, which is in pilot.

The rest of my time goes to things with engines and horizons: I am a pilot in training on ultralight aircraft, I ride motorcycles, and I keep a growing list of countries. Flying rewards preparation and checklists, riding rewards attention, travel rewards curiosity; I try to bring the same traits to a codebase.