Martin Janssen is a software developer based in Rotterdam with eight years of experience building backend systems in C#/.NET and integrating complex communication protocols like Modbus, ICX and MQTT. He currently develops cloud-enabled solutions at WoodWing Xtendis after progressing from junior roles at Concera where he implemented protocol-heavy services. Besides backend work he contributes to front-end test automation—most notably setting up Cypress and UI tests for the educational Hedy programming-language project—showing a pragmatic full-stack mindset. Martin pairs technical curiosity with applied problem-solving, having taught computer science and managed finances for a 900+ member student association. He is pursuing a Master in Financial Economics while holding a Bachelor in Computer Science & Economics, combining technical depth with quantitative and business perspectives. Colleagues describe him as a young, eager engineer who enjoys untangling complex integration challenges and improving developer workflows.
7 years of coding experience
4 years of employment as a software developer
Bachelor Computer Science & Economics, Bachelor Computer Science & Economics at Leiden University
TTO Natuur en Techniek, TTO Natuur en Techniek at Wartburg College
Master Financial Economics, Master Financial Economics at Erasmus University Rotterdam
Hedy is a gradual programming language to teach children programming. Gradual languages use different language levels, where each level adds new concepts and syntactic complexity. At the end of the Hedy level sequence, kids master a subset of syntactically valid Python.
Role in this project:
Front-end & Test Automation Engineer
Contributions:3 reviews, 33 commits, 8 PRs in 2 months
Contributions summary:Martin primarily focused on setting up and testing the front-end of the Hedy project. Their contributions included the initial setup of Cypress for end-to-end testing, creating test files, and writing test cases. They also worked on integrating and configuring Cypress, including environment variables and disabling file change watching, and writing UI tests for the Teacher page.
Identify email addresses or domains names that belong to colleges or universities. Help automate the process of approving or rejecting academic discounts.
Contributions:2 pushes in 12 days
pythonemailaddressesemail-addressescolleges
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Martin Janssen - Software Developer at WoodWing Xtendis