• Led a 35-member tech team at Daytrip, scaling a travel startup from 5 to 40M€ gross margin and securing A and B investment rounds.• Transitioned mindset to long-term scalability during COVID, implementing DevOps model for rapid feature deployment and A/B testing.• Achieved increased customer value through efficient feature deployment and testing.

Leading an (almost) fully remote team designing and developing highly scalable microservices for DAZN using Node.js and AWS. Serverless and Docker mainly. Including day to day management, 1:1, performance reviews, discussions with the customer and redesigning solutions. My role is Engineering manager for a team of 5 mostly remote members incl. QA. I’ve built a well-working team of 5 from the ground up by hiring the right people, setting process but giving them the freedom to explore the new solution and fight for true DevOps approach allowed very smooth and trouble-free development and delivery.

Gettick is fast growing startup: https://gettick.com/I was working on many things, but my main focus was development of highly scalable Node.js backend running in Kubernetes cluster together with Redis and MongoDB. I did also some frontend React and Electron app work.

Yes, I was twice in Massive. Or better I had startup break for a half a year.Development one of the worlds biggest live and on-demand sports content service https://www.dazn.com (aka Netflix for sports). See above.Our responsibility was to develop the whole backend for streaming service and integrate various services as Salesforce for user management, Zuora - payments. Ingest sports data, allow service scalability for tens of thousands of users and other 3rd party integrations for our frontend. Biggest challenges were the scalability of these huge data sets. We solved it by fine-tuning of caching and using the right AWS services. Mainly S3 bucket and CDN - CloudFront.

Working on crucial Skype/Microsoft projects with 200 millions of users in DevOps/Agile operating model as backend PHP and .NET (Azure cloud) developer.I was working in Identity / Authentication team. Every member was responsible for development including automated and performance testing, live monitoring, alerting and live site issue solving as they come.I was mainly working on authentication token exchange backend, Skype - Microsoft account integration, Skype OAuth (jwt) authentication. SSO, Azure Active directory (ADFS) and other user management REST micro-services.

I was working as Application Developer for Honeywell. I was responsible for development and maintenance of large(10k+ users) corporate application in Nette Framework using agile project management.I have designed and mainly rewrote application core for better performance and further expansion.

Development of large Information System called SynopisIS. 5 member team. I was responsible for development of new key features on customer’s demand, maintenance and performance optimization. Part of job was development of product propagation websites with CMS Drupal and SEO optimization.

Web developer PHP, .NET, Java

External web developer/designerJan worked on company web presentations and custom scripts in PHP.