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Chris De JagerCD

Chris De Jager

Senior PHP Developer

€ 720/dag
Leiden, NL
15+ jaar

Gemiddelde responstijd: 1 uur

Over Chris

  • Nederlands

    Tweetalig / moedertaal

  • Engels

    Vloeiend

  • Fins

    Basiskennis

Kan op locatie werken
Leiden (tot 50km)

Werkervaring

  • Hipsy
    Senior PHP Developer
    november 2025 - februari 2026 (3 maanden)
    Hipsy is a conscious events platform and ticketing system built on Laravel. I started by dockerizing the dev workflow. Then I designed and implemented an affinity-based recommendation engine that derives each user's affinity with organisations and event categories from their behaviour. These scores were subsequently used to generate personalised suggestions for events, categories and organisations. I also built various frontend features using Livewire, AlpineJS and Tailwind.
  • EuropeTrack NL
    Senior PHP Developer
    april 2024 - december 2025 (1 jaar en 8 maanden)
    After EuropeTrack was acquired by Moving Intelligence and became part of the Echoes Group, they decided to replace all platforms with their Echoes platform. I helped with the migration effort of the EuropeTrack dataCodeIgniter and CORE/Api platform. I built several Symfony workers for real-time device activation/deactivation and trip synchronization between the Doctrine/database and Kafka streams. This included Kafka consumers/producers, message validation, data mapping, and unit tests. To improve production resilience and monitoring, I added structured logging, Sentry integration, and retry-safe message handling.
  • Leiden University
    Frontend Developer
    november 2024 - juni 2025 (7 maanden)
    Developed a custom front-end extension for a Qualtrics-based research survey commissioned by the Dutch Tax Authority and conducted by Leiden University. Using JavaScript, CSS, and Google Sheets integration, I built a dynamic header showing a time bar and evolving euro balance that responds to participant choices. To overcome Qualtrics' limitations, I engineered smart workarounds that allowed researchers to flexibly configure and adjust simulation parameters without editing code.

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Opleidingen

  • Professional Scrum Master II (PSM II) Professional Scrum Master I (PSM
    I)
    Professional Scrum Master II (PSM II) Professional Scrum Master I (PSM
  • MSc
    Leiden University
    2006
    MSc

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