Martijn Russchen is a product-led founder and Principal Product Manager with 12 years of experience blending hands-on engineering, front-end contributions, and strategic product leadership. At HackerOne he progressed from software engineer to leading agentic AI products and CTEM remediation strategy, driving Hai from pilot to 90%+ customer adoption and embedding AI into core remediation workflows. He founded IntervalCoach to apply AI and 60+ recovery signals to adapt athletic training in real time, reflecting his knack for turning complex data into actionable user experiences. A frequent front-end contributor in open-source projects (notably improving accessibility and portal-based behavior in a popular React datepicker and enhancing HackerOne’s docs/search UX), he pairs code-level curiosity with platform thinking. Based in the Netherlands, he also runs a visual communications studio, bringing a designer’s eye to product UX and storytelling. Martijn’s uncommon strength is translating messy telemetry into crisp product decisions that scale across integrations, partners, and large enterprise customers.
11 years of coding experience
13 years of employment as a software developer
Bachelor’s Degree Communication and Multimedia Design, Bachelor’s Degree Communication and Multimedia Design at Hanze
Information Sciences, Information Sciences at Windesheim
A simple and reusable datepicker component for React
Role in this project:
Front-end Developer
Contributions:177 releases, 141 reviews, 1576 commits in 8 years 7 months
Contributions summary:Martijn's commits focused on enhancing the React Datepicker component's styling and functionality. They added styling for different elements and icons and implemented a mechanism for showing and hiding the datepicker via a React Portal. They also adjusted the application of styling and class names to improve the component's visual appearance. The user has made significant changes to both the presentation and accessibility of the components.
Contributions:133 reviews, 323 commits, 325 PRs in 4 years 8 months
Contributions summary:Martijn primarily focused on updating the HackerOne platform documentation's front-end components. They modified React-based components, including the article, mobile navigation, and search functionality. They also updated the Gatsby configuration and deployed the documentation to a gh-pages branch. Additionally, the user implemented search functionality using the DocSearch library.
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Martijn Russchen - Principal Product Manager at HackerOne