Karol Furgol

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. My projects include Outvo, an AI speaking-practice app for language learners, and 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

Started as an intern, then joined full-time. Contributed to Kyma, an open-source Kubernetes application platform, and its commercial offering.

• Built features for Compass, Kyma's runtime management component, including GraphQL APIs in Go and integration tests.
• Developed CI/CD pipelines with Prow, including GKE cluster provisioning, DNS management and SSL certificate automation.
• Maintained the serverless runtime, including function image builds, dependency updates and security patches.
• Created Helm charts for multiple components and wrote unit, integration and end-to-end tests.

Interests

• Travel
• Playing guitar
• Learning languages
• Cycling
• Hiking
• Investing

Contact

Find me on GitHub, LinkedIn, or reach me at [email protected].

I can share my CV by email.