Mark Nelissen
Founder & CTO at Gemsotec BV
Brussels Metropolitan Area Belgium
Summary
🤩
Rockstar🎓
Top SchoolMark Nelissen is a founder and CTO with 11 years of professional software engineering experience, grounded in a Master’s in Electrotechnical Engineering from Vrije Universiteit Brussel. He has progressed from hands-on software engineer and team lead roles to software architect and technical lead positions, now steering product and company technology strategy at Gemsotec BV since 2017. Mark is experienced in driving product evolution end-to-end—analysis, design, implementation, testing and performance tuning—while coaching teams and establishing architectural best practices. His background shows a steady focus on maintainability and automation of product lifecycles, plus hands-on prototyping to validate technical directions. Based in Brussels, he blends engineering rigor with entrepreneurial drive, often translating R&D insights into practical product features. Colleagues would note his consistent emphasis on coaching and risk-aware delivery as a driver of team productivity.
11 years of coding experience
11 years of employment as a software developer
Master, Electrotechnical engineering, Master, Electrotechnical engineering at Vrije Universiteit Brussel
English, Dutch, French, Spanish, German
Github Skills (137)
typescript-definitions10
websocket10
material-ui10
admin-on-rest10
javascript10
graphql-api10
single-page-application10
rest10
react-admin10
socket-io10
admin10
typescript10
dts10
installer10
nodejs10
Programming languages (13)
Github contributions (5)
marknelissen/react_crash_todo
May 2020 - Nov 2025
Sample to do app to experiment with react features
Contributions:9 pushes, 2 branches, 9 issues in 5 years 7 months
gemsotec/DefinitelyTyped
Jun 2018 - Sep 2020
The repository for high quality TypeScript type definitions.
Contributions:26 pushes, 7 branches in 2 years 3 months
type-definitionshigh-qualitydefinitionstypescriptquality
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