Staff Frontend Software Engineer

**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.

sunday is growing fast and with that comes complexity. We’re scaling across products, markets, and teams.

This role is about bringing **clarity and coherence** to that complexity ensuring our front-end experiences are consistently fast, resilient, and delightful, no matter the market or device.

You’ll play a key part in shaping how sunday builds and scales its front-end stack, setting standards that enable hundreds of future features to be shipped with confidence and quality.

**About the Role**:
We’re looking for a **Staff Front-End Software Engineer** to help elevate how we build guest and merchant experiences at sunday. This isn’t just about writing great code ; it’s about shaping how front-end development is done across the company.

You’ll play a key role in defining our front-end architecture, driving consistency and performance across multiple products, mentoring other engineers, and setting the bar for design systems, developer experience, and technical quality.

If you care about creating fast, resilient, and delightful user experiences and want to multiply your impact by raising the level of the entire engineering organization we want to hear from you.

**Key Responsibilities**:

- You are **impact-driven**: you don’t just ship features: you deliver experiences that users love
- You thrive in a fast-moving, high-ownership environment and enjoy balancing product delivery with long-term architectural thinking.
- You take **end-to-end ownership**: from shaping user flows with design and product teams, to ensuring reliability and performance in production.
- You care deeply about the “why” behind what you build, not just the “how”. You’re comfortable engaging in early product conversations and using data and customer feedback to guide decisions.
- As a staff engineer, you see your role as a **force multiplier**: you lead by example, mentor engineers, align teams around best practices, and drive architectural clarity across codebases.

**What You’ll Do**:

- ** Drive consistency across experiences**, ensuring our merchant and guest interfaces feel cohesive, accessible, and high-quality.
- ** Partner closely with design and product** to shape delightful, fast, and resilient user experiences.
- ** Define and evolve standards, shared libraries and design systems**, making sure they scale across teams and projects.
- ** Raise the bar on code quality** through rigorous testing, documentation, and tooling.
- ** Mentor and guide other engineers**, fostering a culture of craftsmanship, empathy, and technical excellence.
- ** Share your insights** through architecture reviews, internal talks, and documentation (ADRs, open forums, etc.).

**About You**:

- ** High ownership** mindset and a **collaborative**, team-first approach and lead by example
- A strong knowledge of **React, TypeScript**, **state management**, and **front-end architecture patterns**:

- Experience leading or shaping **large-scale front-end systems** (design systems, shared components, performance frameworks, etc.).
- Expertise in **testing**, **monitoring**, and **performance optimization** for SPAs and PWAs.
- Ability to translate business and product goals into elegant, maintainable technical solutions.
- Excellent **communication skills**, both written and verbal.
- Proven experience mentoring and growing engineers.

**Technical Edge**:
You don’t need to be an expert in everything, but the more of these boxes you tick, the better:

- Deep understanding of browser performance and optimization (Core Web Vitals, lazy loading, caching strategies).
- Fluent with observability tools (Datadog, Sentry, etc.) and front-end monitoring practices.
- Understanding of accessibility and internationalization best practices.
- Knowledge of secure front-end patterns and PCI-compliant architectures.
- You are not afraid to jump into JVM backend codebases and to contribute actively on them to achieve company goals
- Understanding of edge deployments

**️ Compensation, Perks & Benefits**:

- Competitive salary (90-110k) 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 wit