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Kylian JanssensKJ

Kylian Janssens

Full stack developer

€ 550/dag
Antwerpen, BE
3-7 jaar

Gemiddelde responstijd: 1 uur

Over Kylian

Looking for a Ruby on Rails and React developer who can help build and scale modern fintech applications?

I help companies develop, maintain, and improve web applications using Ruby on Rails, React, TypeScript, and Stimulus. From building new features and APIs to optimizing existing systems, I focus on delivering clean, scalable, and maintainable solutions that create real business value.

My experience includes working on fintech platforms, payment-related workflows, authentication systems, and business-critical applications where reliability, performance, and security are essential. I enjoy collaborating with international teams and translating complex requirements into practical, user-friendly solutions.

I typically work on:

Full-stack web application development
Ruby on Rails backend development and API design
React, TypeScript, and Stimulus frontend development
Authentication and authorization integrations
Payment and fintech-related workflows
Performance optimization and codebase modernization
Third-party integrations and system maintenance

With experience across both backend and frontend development, I can contribute throughout the entire product lifecycle—from planning and implementation to deployment and ongoing improvements. Whether you need support for an existing application or a developer to help build new features, I bring a pragmatic approach focused on delivering reliable, high-quality software
  • Nederlands

    Tweetalig / moedertaal

  • Engels

    Vloeiend

  • Frans

    Beperkte professionele capaciteit

Uitsluitend remote
Werkt voornamelijk remote

Werkervaring

  • Cipal Schaubroeck
    Full-stack software developer | Ruby on Rails | React TS
    SOFTWAREPRODUCTIE
    januari 2024 - Vandaag (2 jaren en 6 maanden)
    Antwerp, Belgium
    As a Software Developer at Cipal Schaubroeck, I take a lead role within the bailiff domain, focusing on automating and scaling debt collection workflows. This includes implementing bulk action functionality for efficient assignment of large volumes of invoices to bailiffs, developing a template preview system for enforcement notices with dynamic content rendering, and extending billing logic to apply additional fees when generating legal enforcement documents. I optimize a high-volume daily reminder system responsible for sending thousands of automated payment reminders per day, and contribute to performance improvements in batch processing and reminder delivery pipelines. Additionally, I implement Keycloak-based authentication in the React frontend to improve identity and access management, and help refine end-to-end collection workflows to improve scalability and usability for both internal teams and external stakeholders.
    React.js Ruby MySQL Jenkins Gitlab
  • Kyliminjaro
    Software Developer
    SOFTWAREPRODUCTIE
    januari 2023 - Vandaag (3 jaren en 6 maanden)
    Antwerp, Belgium
    As a Software Developer at Kyliminjaro, I contribute to the development and maintenance of modern web applications using Ruby on Rails, React, TypeScript, and Stimulus. I work across the full stack, building scalable features, improving system performance, and collaborating with cross-functional teams to deliver reliable software solutions.

    In addition to client projects, I developed a multi-tenant damage management platform for automotive repair businesses. The application enables repair shops to manage the complete repair process, including:

    Creating and managing damage cases
    Uploading and organizing photos throughout the repair lifecycle
    Generating repair estimates and cost calculations
    Tracking employee time registrations per repair job
    Managing customers, vehicles, and repair statuses
    Supporting multiple companies through a secure multi-tenant architecture

    This project involved designing the application architecture, building a full-stack Rails application with Hotwire and Stimulus for a responsive and reactive user interface, and implementing role-based access control. Through this work, I gained hands-on experience with multi-tenancy, business process automation, and building software that directly improves operational efficiency for end users.
    Claude Stimulus Hotwire Ruby on Rails

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