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Wouter van Marrum

Senior Software Developer | Systems & Product Engineering

Professional Summary

Technical Skills

Languages: PHP ( Laravel / Symfony ), TypeScript, Javascript
Frameworks & Libraries: React, NextJS, PHPUnit ( Pest ), PHPStan
Tools & Platforms: Coolify, Cloudflare (R2), GitHub (Actions), Docker, CI/CD

Professional Experience

Senior Software Developer at Kaartje2go

Present

Hybrid - Zwolle, Netherlands

  • 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 and contact moments using PHP, Symfony, Live Components, and webhook integrations. Enabling immediate visibility into customer issues, used by 20+ customer support employees.

Senior Software Developer at Planningsagenda

Hybrid - Netherlands

  • 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 - Enschede, Netherlands

  • Architected and executed a complete rewrite of a large, outdated API using PHP/Laravel.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 - Zwolle, Netherlands

  • 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 - Apeldoorn, Netherlands

  • 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 - Zwolle, Netherlands

  • 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.

Education

Medewerker ICT, ROC Ter AA

Helmond, Netherlands