Sebastian Crasnanic

Backend Engineer

Building high-performance Go services, cloud-native infrastructure, and event-driven systems. Currently at Eco-Movement in the Netherlands.

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Projects

Webhook Dispatcher

Live concurrency demo: goroutine worker pools, channel-based distribution, and real-time SSE streaming. Try it now.

goroutines channels SSE

fulenn.dev

This site. Single Go binary with embedded assets, HTMX for navigation, PostgreSQL, deployed on Kubernetes via Cloudflare Tunnel.

Go HTMX K8s

Tome

Goodreads alternative for tracking books. Go backend, HTMX frontend, PostgreSQL. Work in progress.

Go HTMX PostgreSQL

What I work with

Languages

Writing production services day to day.

Golang PHP

Infrastructure & CI/CD

Containerizing, deploying, and keeping things running.

Kubernetes Docker GitLab CI Bitbucket CI

Cloud & Data

Streaming, querying, and storing at scale.

GCP Pub/Sub BigQuery PostgreSQL MySQL

Currently

Software Engineer · Eco-Movement

April 2023 — Present · Utrecht, Netherlands

Building high-throughput Go APIs processing 200+ req/s for EV charging status changes. Designing event-driven pipelines with GCP Pub/Sub and replacing legacy services with concurrent Go microservices.