Web Fullstack Engineer

Join to apply for the

Web Fullstack Engineer

role at

sunday

This range is provided by sunday. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range Competitive salary (70 to 85k euros depending on seniority) and equity.

About Us At

sunday , we’re transforming the dining experience with fast, seamless payments. No more waiting for the bill — with one scan, guests pay, tip, and leave. We're creating a world where time is better spent enjoying the moment. We’re a growing team of bold thinkers, builders, and creators, working across Europe and North America to bring better hospitality to life.

About The Role We’re looking for a

Senior Front-End Engineer

to help elevate how we build guest-facing products at

sunday . This isn’t just about writing great code — it’s about shaping how the front‑end is done across the company. You’ll play a critical role in structuring projects, setting engineering standards, mentoring teammates, and driving architectural clarity. If you care about quality, collaboration, and creating systems that scale, we want to hear from you.

Key Responsibilities

Drive the unification and evolution of guest-facing features across our React apps to deliver a cohesive and high-quality user experience

Lead architectural decisions and long-term thinking around scalability, performance, and maintainability

Raise the bar on code quality through testing, documentation, and shared tooling

Help evaluate and guide our transition toward a monorepo structure and a more modular front-end platform

Partner closely with backend, product, and design teams to deliver value through fast, focused iterations

Improve and extend our design system to ensure consistent and reusable UI components

Share your thinking in architecture forums and document decisions through Architecture Decision Records (ADRs)

About You

Deep experience building modern web applications, with a track record of driving structure or improvements across teams or systems

Strong proficiency in React, TypeScript, and scalable front-end architecture patterns

Fluency in testing approaches, performance optimization, and modern front-end tooling

Ability to translate business and product goals into maintainable technical solutions

Clear communicator, both written and verbal — especially in asynchronous contexts

High ownership mindset and a collaborative, team-first approach and lead by example

Technical Edge

Ability to design and challenge REST API contracts for clarity, completeness, and long-term evolution

Solid understanding of authentication flows (OAuth, session management, token refresh)

Awareness of front-end security concerns (XSS, CSRF, sandboxing) and how to address them proactively

Experience building resilient interfaces on top of distributed systems (graceful degradation, loading states, error handling)

Familiarity with observability (logs, traces, metrics) and performance monitoring tools

Basic understanding of edge deployments and frontend-backend split architectures (e.g. serverless front, API gateway, etc.)

Experience building modular and reusable front-end components in a design system context

Why This Role Matters sunday is growing fast — and with that comes complexity. We’re scaling across products, markets, and teams. This role is about helping us bring clarity to that complexity. You’ll play a key part in shaping the way we build and scale the front-end at Sunday, making sure our guest-facing experiences are fast, delightful, and resilient — no matter how big we get.

Compensation, Perks & Benefits

Competitive salary (70 to 85k euros depending on seniority) and equity

Remote-first friendly culture with flexible working hours

The chance to build products used by millions across the globe

100% health coverage for you and your children

Free vacation policy

Opportunity for significant impact in shaping data strategies and innovative product development within a high-growth environment

Thank you for taking the time to apply, and looking forward to getting to know you!

sunday is an equal opportunity employer and does not discriminate and all qualified applicants will receive consideration for employment without regard to race, creed, color, sex, affectional or sexual orientation, gender identity or expression, gender, ethnicity, religion, national origin, ancestry, nationality, age, disability, marital status, veteran status, genetic information, or on any other basis prohibited by law (except where an attribute is a bona fide occupational qualification).

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