Senior Frontend Engineer — Own the UI, AI‑Driven FinTech

Cardlay A/S; København; Hybrid; DKK 700,000 - 1,000,000; Full time

Benefits offered by this job

Hybrid work from Copenhagen or Odense

Company-paid phone

Home internet

Lunch, coffee, fruit, drinks and in‑k-

Job summary

Cardlay is a Danish fintech building white-label card and spend management solutions. Our web portal lets companies run cards, expenses, accounting and people management with their own brand.

As Senior Frontend Engineer, you own the frontend of our web portal, drive architectural decisions, build reusable components, and mentor peers. You will work closely with Product and our UI/UX Lead, reporting to the Head of Engineering, with hybrid work from Copenhagen or Odense.

Qualifications

• Deep experience with React and TypeScript.
• Shipped complex features in a web product that customers rely on.
• Experience building or contributing to a design system or component library.
• Familiar with AI-assisted coding tools and best practices.

Responsibilities

• Own the frontend of Cardlay's web portal, ensuring quality, performance and direction.
• Make key frontend decisions on architecture, design system scope and migrations.
• Drive projects from idea to production with Product and UI/UX Lead; own them end-to-end.
• Build reusable components and patterns as part of product work; avoid one-off solutions.
• Migrate legacy screens to the design system, preventing visual regressions.
• Define component APIs, lint rules and documentation to guide AI-generated code.
• Mentor engineers, share knowledge through reviews, docs and pairing.

Skills

Frontend leadership

Mentoring teammates

UX awareness

Tools

React

TypeScript

Vite

pnpm

MUI

styled-components

Storybook

TanStack Query

TanStack Table

Redux Toolkit

React Hook Form

react-intl

Vitest

MSW

Cypress

Biome

Job description

Cardlay is a Danish fintech building white-label card and spend management solutions. Our web portal lets companies run cards, expenses, accounting and people management with their own brand.

As Senior Frontend Engineer, you own the frontend of our web portal, drive architectural decisions, build reusable components, and mentor peers. You will work closely with Product and our UI/UX Lead, reporting to the Head of Engineering, with hybrid work from Copenhagen or Odense.