Senior Frontend Developer - UI

About the Company 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. About the 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. Responsibilities 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. Qualifications Senior experience (5+ years) in a role where you made UI/UX decisions yourself, not just executed designs handed to you. Required Skills 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 performance optimization (Core Web Vitals) and cross-browser/cross-device testing.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. Preferred Skills 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. Pay range and compensation package 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. A competitive, market-rate salary.