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Wouter van Marrum

Senior Software Developer

linkedin.com/in/wouter-van-marrum

Professional Summary

Senior Laravel developer turned interim Product Owner. 10+ years building production PHP systems, with hands-on experience owning delivery across engineering, product, and support teams.

Technical Skills

  • Languages: PHP ( Laravel / Symfony ), TypeScript, Javascript
  • Frameworks & Libraries: React, NextJS, PHPUnit ( Pest ), PHPStan
  • Tools & Platforms: Coolify, AWS (SQS), GitHub (Actions), Docker, Claude, Codex

Professional Experience

Interim Product Owner at Kaartje2Go

— Present

Hybrid

Interim Product Owner, JAM Admin Platform. Led product backlog and delivery for a 4-person cross-functional team, owning prioritization, migration planning, and stakeholder requirements for Kaartje2go's internal admin platform.

  • Owned product backlog for internal admin platform, sustaining consistent delivery cadence (11-16 items/month) across a cross-functional team.
  • Defined requirements and shipped a self-service capability for multi-suborder customer service, reducing manual support workload.

    Senior Software Developer at Kaartje2Go

    — Present

    Hybrid

    • Designed an RFM customer segmentation system processing historical order data using PHP, Symfony, and AWS SQS, improving marketing campaign targeting precision by 60%.
    • Developed a comprehensive customer support dashboard integrating order history, self-service data, personal information, and support requests. Reduced customer support response time 40% through internal tooling.
    • Built a real-time component displaying live external support tickets using PHP, Symfony, Live Components, and webhook integrations. Enabling immediate visibility into historical and current customer issues, used by 20+ customer support employees.

    Senior Software Developer at Planningsagenda

    —

    Hybrid

    • Led migration of legacy platform to Laravel, improving maintainability and enabling faster feature delivery.
    • Introduced PHPUnit testing practices, increasing test coverage by 30% and establishing a test-driven development culture within the team.

    Senior Software Developer at Datatrics

    —

    Hybrid

    • Architected and executed a complete rewrite of a large, outdated API using PHP/Laravel. Improved API performance 40% through architecture redesign.
    • Increased automated test coverage to 90%+ of functionality and introduced static analysis checks to maintain high code quality.
    • Mentored colleagues and interns, helping them improve Laravel skills and grow into stronger developers, with 2 mentees advancing to senior roles.
    • Orchestrated collaboration with offshore team consisting of 4 employees, ensuring smooth knowledge sharing and maintaining code quality standards.

    Software Developer at Motivo

    —

    Hybrid

    • Implemented DTAP (Development, Testing, Acceptance, Production) pipeline using CI/CD tools, streamlining development process and boosting deployment efficiency by 50%.
    • Rolled out Scrum methodology across the organization, fostering an agile, collaborative work environment that improved team velocity.
    • Mentored colleagues and interns, helping them improve Laravel skills and grow into stronger developers.
    • Led technical job interviews, evaluating candidates' skills and expertise to ensure a strong fit for the team and projects.

    Software Developer at DIJ

    —

    Onsite

    • Built an MVP workflow application using Laravel for an online divorce consultant, streamlining intake-to-processing steps and reducing customer workload by ~30%.
    • Optimized a high-traffic course offerings page for a school website using caching and cache busting for content changes in a WordPress/Laravel hybrid setup, resulting in 29% faster page loads and improved usability.

    Software Developer at Texemus B.V.

    —

    Onsite

    • Led feature delivery using Laravel + Vue.js in a 3-intern squad, translating requirements into tickets and unblocking day-to-day work, resulting in 20+ features/user stories shipped and reliable sprint progress.
    • Standardized development workflow using Git pull requests + code reviews on a Laravel/Vue codebase, reviewing 30+ PRs and mentoring 3 interns, resulting in cleaner merges and fewer follow-up fixes after review/QA.

    Software Engineer at Molenbergmedia

    —

    Onsite

    • Gained specific knowledge that is needed for physical production within the reprographic industry.
    • Created a fully functional application that was just in our production department to create leaflets and books in small to medium sizes.

    Education

    Medewerker ICT, ROC Ter AA