• Design and implementation of iOS applications "De Het", "Le La", "Der Die Das" and "Ten Ta To". 1+ million downloads, ratings above 4.5.* Design and implementation of Android applications "De Het", "Le La", "Der Die Das" and "Ten Ta To". 2+ million, ratings between 4.3 and 4.7.

* Worked in a small team of engineers that built from scratch the backend (Spring Boot, Cassandra, Kafka, Kubernetes, Docker) for Yolt personal finance management mobile app that was used by 1.5+ million users in several European countries.* As the team and application grew, contributed to solution architecture and multiple codebases (backend, frontend, data science) that contributed to winning the Innovation Award at J-Fall 2018. * Created architecture and implemented integration of Optimizely into Yolt tech stack so that the company could experiment using A/B testing and roll out new features progressively.* Responsible for several core (micro)services keeping them robust and performant during the whole life cycle with nearly 0 production incidents.* During internal hackathon, participated in prototyping of a new product in Open Banking domain (Spring Boot, React) that later became a 1st class citizen in Yolt B2B products offering. * Organized meditation sessions twice a week to increase the well-being of colleagues (secondary job title: Chief Meditation Officer 😇).* Tech stack: Java, Spring Boot, Kafka, JUnit, Mockito, Cucumber, PostgreSQL, Spring Data, JPA, Hibernate, Cassandra, Prometheus, Grafana, Kibana, Kubernetes, Docker, React, TypeScript, Node.js, AWS, Python, Pandas, Swift, GitLab

• Hands-on application architect providing technical leadership to the scrum team.• Upgraded to the new architecture (Spring-based APIs + AngularJS) several high-profile web pages of ING Internet Banking visited by millions of ING customers, improving their user experience while also creating more maintainable and scalable system.• Upgraded to the new architecture (Spring-based APIs + AngularJS) the section of ING web site for retail insurances enabling the users to take out and update their insurance policies.• Integration with web services and APIs of external parties while complying with strict security constraints of ING Internet banking environment.• Contributions to internal frameworks used for building and testing (micro)services.• Tech stack: Java, Spring Boot, JUnit, Mockito, AngularJS, JavaScript, Node.js, Selenium

• Enhancements to TravelBird websites where users book short vacations and city trips• Tech stack: Python, Django, JavaScript, jQuery, MySQL.

• Rebuilt a simple open-source Django forum module into a mature forum app that can easily handle 100k+ users and 3M+ posts/comments having a rich set of authorization levels, serving the users of the largest gaming website in the Netherlands insidegamer.nl.• Tech stack: Python, Django, MySQL.

* Managed a team of developers working on an application used by marketeers of large corporations to manage products lunches in multiple countries.* Significantly improved delivery time and quality of the delivered software by introducing scrum methodology, continuous integration and automated testing.* Added new members to the development team.* Stepped in as frontend developer when deadlines were approaching, leaving behind robust and performant code.

* Managed team of developers working on TomTom HOME – XULRunner-based desktop application (Windows and OS X) used by 60+ million users worldwide to update the content of their navigation devices.* Later managed team of Java developers working on Spring-based backend services behind tomtom.com.* Involved in introducing agile methodologies in the development organization while TomTom was one of the early adopters of agile in the Netherlands.* TomTom filed 3 patent applications based on my ideas.

* Worked in team of 50+ developers distributed over the USA, Canada and the Netherlands. Managed team of developers in the Netherlands.* Architected, implemented and tested parts of G/Technology (3M+ lines of code, mainly C++).* Multiple significant improvements to performance of G/Technology.* Gathered software requirements from European clients.* Tech stack: C++, Oracle Spatial.

* Worked on several high-profile projects for large European clients as technical lead or senior developer.* Conducted technical workshops for European business partners.

* In an offshore setup - design, development and maintenance of several Intergraph products. Reporting directly to the headquarters in the USA.* Consultancy for clients in Central Europe.