Karol Furgol
Senior Software Engineer | Go & Backend
đź“Ť Around Europe
About
I have 7+ years of professional experience building distributed systems, primarily in Go. My focus is hands-on backend and product engineering, owning features through production and working closely with product teams. I'm interested in crypto, fintech and product-focused SaaS.
I also work with other technology stacks and actively use AI tools in development. I also independently built and launched Checksite, a website-monitoring SaaS. More about my projects →
Work
Swissblock Technologies
Software Engineer
March 2021–October 2026
- Built Go market-data pipelines processing millions of daily cryptocurrency pricing events, with historical backfills and gap recovery using WebSockets, REST, Kafka and Cassandra.
- Built exchange account and portfolio APIs unifying balances, positions and margin data for internal trading systems and tax reporting.
- Automated cash and position reporting from Interactive Brokers, J.P. Morgan and Marex to Bloomberg, including SFTP delivery and reconciliation.
- Worked on traditional financial datasets from LSEG/Refinitiv, Axioma and Bloomberg BPIPE, including T-SQL processing and data validation.
Deployed and supported applications in production on GCP and Kubernetes, using ArgoCD and Kustomize for application deployment.
SAP Labs Poland
Associate Cloud Software Engineer
September 2018–March 2021
Contributed to Kyma and its Compass component. Built GraphQL APIs in Go, migrated the data layer to PostgreSQL, and maintained the serverless runtime with unit, integration and end-to-end tests.
Interests
- Travel
- Playing guitar
- Learning languages
- Cycling
- Hiking
- Investing