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Wouter van Marrum

Senior Software Developer

Professional Summary

Technical Skills

Languages: PHP, TypeScript, Javascript
Frameworks & Libraries: Laravel, Symfony, React, NextJS
Tools & Platforms: Git, Coolify, Cloudflare (R2), GitHub (Actions), Docker, Postman, Cursor

Professional Experience

Senior Software Developer at Kaartje2go

Present

Hybrid - Zwolle, Netherlands

Kaartje2go is a Dutch e‑commerce platform for designing and sending personalized greeting cards and gifts, with fast printing, delivery, and business mailing options.

  • Architected an RFM analysis system using PHP, Symfony, and AWS SQS, that calculates customer scores, enabling multi-seasonal data-driven marketing strategies and improving campaign targeting precision.
  • Developed a comprehensive customer support dashboard integrating order history, self-service data, personal information, and support requests, reducing average response time by 40%.
  • 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 15+ customer support employees.

Senior Software Developer at Planningsagenda

Hybrid - Netherlands

  • Led migration of legacy software to the Laravel framework, modernizing architecture and improving maintainability.
  • Introduced PHPUnit testing practices, increasing test coverage and establishing test-driven development culture within the team.
  • Implemented system architecture improvements that enhanced application performance and reliability, reducing downtime and improving user experience.
  • Mentored developers in Laravel best practices, providing guidance on code optimization and architectural patterns.

Senior Software Developer at Datatrics

Hybrid - Enschede, Netherlands

  • Architected and executed complete rewrite of large, outdated API using PHP/Laravel, improving performance by 60%, enhancing security posture, and enabling horizontal scalability. Extended with comprehensive test suite covering 90%+ of functionality and introduced static analysis checks to maintain high code quality.
  • Replaced significant portions of legacy system with efficient, scalable solution, making platform faster and more reliable while reducing infrastructure costs.
  • Mentored colleagues and interns, helping them improve Laravel skills and grow into stronger developers, with 3 mentees advancing to senior roles.
  • Conducted technical interviews and evaluated candidates, playing active role in hiring process that resulted in 5 successful hires.
  • Orchestrated collaboration with offshore teams across time zones, ensuring smooth knowledge sharing and maintaining code quality standards.
  • Designed, built, and maintained APIs, continuously optimizing for efficiency and reliability while handling high traffic volumes.
  • Championed best practices in development, code quality, and testing, establishing standards that kept team delivering high-quality software consistently.
  • Provided guidance and support to junior developers and interns, helping them navigate challenges and accelerate their professional growth.
  • Maintained and improved existing applications, proactively fixing issues and optimizing performance to reduce technical debt.

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 organization, fostering agile and collaborative work environment that improved team velocity.
  • Led technical job interviews, evaluating candidates' skills and expertise to ensure strong fit for team and projects.
  • Developed and maintained PHP/Laravel applications with focus on code quality and performance optimization.

Software Developer at DIJ

Onsite - Apeldoorn, Netherlands

  • Implemented comprehensive test suite covering functional and non-functional requirements, reducing debugging time by 35% and boosting development efficiency.
  • Leveraged Bugsnag for proactive error monitoring, cutting production bugs by 50% and ensuring smoother project deployments.

Software Developer at Texemus B.V.

Onsite - Zwolle, Netherlands

  • Improved overall software performance and stability by implementing test suite, reducing bugs and errors by 40%.
  • Mentored interns by providing hands-on Laravel experience, offering practical advice, and encouraging ownership of their growth and development.

Education

Medewerker ICT, ROC Ter AA

Helmond, Netherlands