Senior Frontend Engineer

Join a 5xPrivate Equity growthjourney and buildamazing frontendsolutions as we turn Frontline Workers into Frontline Winners

We are looking for a Senior Frontend Engineer to lead complex frontend initiatives across the Relesys platform. You will take ownership from an initially ambiguous product problem through technical design, delivery, rollout and learning in production.

Working closely with Product, Design, backend engineers and other frontend engineers, you will create clarity, make architectural trade‑offs and help the team deliver maintainable, accessible and high‑quality product experiences. This is a hands‑on individual‑contributor role with significant technical and project leadership responsibility.

A significant part of the role will be helping us evolve our frontend architecture incrementally while continuing to deliver customer value. Our product includes modern and established frontend technologies, and we are introducing new product experiences and AI‑assisted capabilities. You do not need to be an expert in every framework, but you must be able to lead safely across technical boundaries. You will have the possibility to form part of our established office environment in Lithuania, Copenhagen, London, or Odense! This is an exciting and transformative time to join Relesys, as we have gone into a strategic partnership with the Private Equity fund, Copilot Capital, where the coming years will bring extensive growth and opportunities along the way. You get a unique opportunity to make a tremendous impact in taking your career, Relesys and our dear clients to the next level over the coming years – as we say it, joining a scale‑up at this stage is a rare opportunity that is "once in a lifetime".

Your key responsibilities

Own ambiguous, high‑impact frontend initiatives from discovery through production, including the outcome and not only the implementation tasks

Partner with Product and Design to clarify the customer problem, challenge assumptions and shape an achievable solution

Lead technical discovery and frontend design, making trade‑offs between delivery speed, user experience, maintainability and migration cost explicit

Break complex initiatives into safe milestones with appropriate testing, telemetry, feature flags and rollback plans

Design and implement accessible, responsive and resilient experiences while evolving our frontend architecture and design system incrementally

Take responsibility for production outcomes, investigate difficult problems, prevent recurring issues and adjust the solution when evidence changes

Mentor engineers, raise the quality of technical discussions and code reviews, and help others make better decisions

Collaborate across frontend, backend, Product, Design and Quality Engineering to create alignment and bring decisions to closure

Who are you?

You have 5+ years of professional experience within software development and a proven track record of building, delivering, and maintaining high‑quality software solutions in a professional environment

You have a demonstrated record of leading substantial frontend initiatives from an unclear problem to a production outcome

You have strong TypeScript and browser fundamentals, with deep production experience in React, Angular or a comparable modern frontend framework

Sound judgment in frontend architecture, state management, API integration, component design and maintainability

Experience building accessible, responsive and well‑tested interfaces and improving performance using measurable evidence

The ability to work effectively in a large or evolving codebase and modernise it incrementally rather than requiring a complete rewrite

The ability to explain technical decisions clearly, mentor engineers and resolve disagreement constructively

A product mindset and a habit of taking accountability beyond completing a backlog

You are a team player and wishes to engage in the office and its succes while enjoying a collaborate positiv environment

You have a bachelor’s Degree in Computer Science, Information Technology, or similar

You believe that performance is not a matter of fast deliveries but high‑quality deliveries and a strong team spirit

You have excellent communication skills in verbal and written English

Furthermore, it would be great, but not required, if you have/are:

Modernising AngularJS or another legacy frontend while continuing normal product delivery

Working across both React and Angular applications

Creating design systems, shared frontend capabilities or visual‑regression practices

Building mobile web experiences or applications delivered through a native WebView

Introducing frontend observability or accessibility practices

Using AI‑assisted development responsibly, including verification, testing and protection of confidential data

What do we offer?

"Once in a lifetime" growth opportunity in an aspiring unicorn business that will 5x over the coming 4-5 years backed by the Private Equity fund, Copilot Capital

Great level of responsibility from day one in a dynamic and international environment

A collaborative and thriving office‑first culture where team spirit and fun are at the heart of everything we do

Access to cutting‑edge technology and resources, enabling you to excel in your role and drive impactful change

The chance to make a significant impact on the long‑term strategic direction of our platform

25 days of paid vacation per year

We offer a competitive compensation package based on your skills and experience, with a starting salary of EUR 5000-7000 gross depending on level

Office and team in Vilnius, London, Odense and Copenhagen

Free coffee, tea, soda, or similar at the office

Global Summer Party in Copenhagen with the whole organization

Thriving Culture Club that plans Friday bars, running club, Tuesday fitness w. professional instructor, Wednesday bathing club, Summer parties, Christmas Parties and many other social events

The hiring process

Teams call with Talent Department

In‑office or online interview and casual first talk with our Head of Engineering

Official Interview and Technical Challenge with the Head of Engineering, CTO, & Talent online

Final step is the Assessio Personality test, which all Relesys colleagues take, with the purpose of strengthening our cross‑collaboration by becoming more aware of each person's unique strengths, communication style and where we make each other stronger!

Follow-up conversation about our match – If successful, we are excited to welcome you to the team!

When do you start?

We are looking for a colleague to start as soon as possible

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