Senior Frontend Developer

twentysix; Gennep; On-site; EUR 60,000 - 90,000; Full time

Job summary

Happy Horizon in Gennep is looking for a frontend engineer to join the Technology team, working with backend developers, UX designers, and solution architects on client delivery and internal tooling.

You will translate Figma specs into production-ready UI, own frontend decisions within your squad, review code, and help junior developers grow. Projects run in two-week sprints with client demos.

Qualifications

• Experience with modern JavaScript frameworks for frontend development.
• Ability to translate Figma specifications into production-ready UI.
• Comfort in reviewing code and mentoring junior developers.
• Wamiliarity with component libraries, accessibility, and performance-focused frontends.

Responsibilities

• Own technical decisions within your squad and review code.
• Collaborate with designers to translate figures specs into UI.
• Support client delivery and internal tooling projects.
• Help junior developers grow and contribute to two-week sprint cycles.

Job description

Happy Horizon builds digital products and platforms for clients across retail, healthcare, and public services. You will join our Technology team in Gennep, working alongside backend developers, UX designers, and solution architects on client delivery and internal tooling.

Your work spans component libraries, accessible interfaces, and performance-focused frontends in modern JavaScript frameworks. You will take ownership of technical decisions within your squad, review code, and help junior developers grow. Projects typically run in two-week sprints with clear milestones and regular client demos.

You will collaborate closely with designers to translate Figma specs into production-ready UI, and with strategists to ensure what we build supports measurable business goals. We value pragmatic engineering: shipping reliable work on schedule matters more than chasing every new framework.