Senior Front-end / UI Developer

CollectOnline NV; Zwijnaarde; Hybride; EUR 65 000 - 90 000; Plein temps

Avantages offerts par ce poste

Permanent contract

Hybrid work in Ghent

Design and build autonomy

Résumé du poste

CollectOnline NV in Belgium is seeking a senior front-end developer who is both a designer and a builder. You’ll create new screens and interactions without ready-made mockups, translating them into solid front-end code within our product.

You’ll work closely with the CTO for day-to-day guidance and final sign-off with the CEO. You’ll contribute across two products: DunningOnline (Vue.js SPA with TypeScript) and RecoverOnline (Symfony/Twig).

Qualifications

• 5+ years of frontend experience with UI/UX ownership.
• Ability to design interfaces from scratch without a pattern library.
• Strong expertise in semantic HTML5, accessibility, and responsive design.

Responsabilités

• Concept screens and interactions for DunningOnline and RecoverOnline.
• Translate designs into performant HTML, SCSS and TypeScript on Bootstrap.
• Develop and maintain the DunningOnline Vue.js SPA.
• Integrate front-end code into Symfony/Twig environment with CTO guidance.
• Monitor load times and Core Web Vitals; optimize assets.
• Ensure WCAG 2.2 AA accessibility across the platform.
• Collaborate with CTO/CEO on architecture and quality.

Connaissances

UI/UX decisions

Semantic HTML5

SCSS

Bootstrap

TypeScript

Vue.js

Git workflows

Figma

Dutch

English

Outils

Vue.js

Bootstrap

TypeScript

Twig

Symfony

PHP

SCSS

Description du poste

CollectOnline builds intelligent order-to-cash and debt management software — with DunningOnline and RecoverOnline, we help businesses in more than 14 European countries get paid faster and more efficiently. We’re a Belgian SaaS scale-up with a newly opened office in Ghent, growing fast across product, sales and team.

Your Role

To keep building out our platform, we’re looking for a senior front-end developer who is as much a designer as a builder. You won’t be handed ready-made mockups: you’ll come up with new screens and interactions yourself — with our brand style (colors, typography) as the only fixed framework — and then translate that into solid, working front-end code within our product. You’ll work with our CTO on a day-to-day basis, and align new screens and interactions with the CTO and CEO for final sign-off.

This isn’t a role for a purely graphic designer who never touches code, nor for a developer who only builds logic without an eye for what ends up on screen. We’re looking for someone who can conceive a good interface from a blank canvas and build it themselves.

Our two products each have their own front-end architecture. RecoverOnline runs on a Symfony (PHP) backend with server-side rendered Twig templates on Linux. DunningOnline is a single-page application, built in Vue.js with TypeScript. Across both products you’ll work with HTML, SCSS, Bootstrap and TypeScript; for DunningOnline you’ll actively apply Vue.js on top of that, and for RecoverOnline you need to move comfortably in the Symfony/Twig environment without writing backend code yourself.

What you'll do:

• Conceive screens and interactions yourself for DunningOnline and RecoverOnline, with our brand style (colors, typography) as the only fixed framework.
• Translate those designs yourself into performant, responsive HTML, SCSS and TypeScript, built on Bootstrap.
• Help build and maintain the DunningOnline SPA in Vue.js and TypeScript.
• Integrate front-end code for RecoverOnline into our Symfony/Twig environment, in consultation with the CTO.
• Monitor and optimize the performance of screens (load time, Core Web Vitals, asset optimization).
• Ensure semantic, accessible HTML throughout the platform, in line with WCAG 2.2 AA.
• Align new screens and interactions with the CTO and the CEO for final sign-off.
• Work closely with the CTO on architecture, planning and the quality of the front-end.

What we expect from you

• Senior experience (5+ years) in a role where you made UI/UX decisions yourself, not just executed designs handed to you.
• Strong design instinct: you can independently conceive a good, user-friendly interface from a brand style, with no existing pattern library.
• Strong, semantic HTML5 skills — you build pixel-accurate work that a colleague doesn't need to redo.
• Strong SCSS skills (variables, mixins, nesting) and experience with Bootstrap as a CSS framework.
• Strong TypeScript skills, including working with a build/compile step.
• Strong Vue.js skills (component architecture, state management, routing) for the DunningOnline SPA.
• Basic working knowledge of Twig, PHP, Symfony and Linux for the RecoverOnline side — you won't write backend code, but you can move comfortably in that environment.
• Knowledge of accessibility standards (WCAG 2.2 AA).
• Comfortable working with Figma (or similar) to prototype your own designs, not just to read designs handed to you.
• Experience with Git workflows (branching, pull requests, code review).
• A portfolio showing that you've conceived and built UI/UX yourself — not just executed other people's designs.
• Comfortable presenting and aligning design proposals with the CTO and CEO.
• Fluent in Dutch and English.

Nice to have:

• Experience with Nuxt.js or similar Vue tooling.
• Experience with PHP, Symfony or Twig beyond a basic working knowledge.
• Interest in or experience with SaaS products in a B2B context.

What we offer

• Permanent contract with CollectOnline NV.
• Based at our office in Ghent (3Square, Zwijnaarde), with the option of hybrid working under our company policy.
• Real design and build autonomy over the look and feel of our product, with direct access to the CTO and CEO.
• A growing, ambitious team within a Belgian SaaS scale-up expanding internationally.

Ready to Build the Future With Us?

We're always looking for talented people who are passionate about technology, innovation, and creating software that makes a difference.

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