Fullstack Engineer - Mid to Senior Level

About the job

At the EYs digital product organization you will be building tax automation tools and AI-integrated platforms for increased efficiency quality and joy in tax and compliance workflows.

We help thousands of clients with services such as producing correct and compliant tax filings and consulting multinational companies on how to navigate the international tax landscape.

To do those jobs with the highest degree of quality and efficiency robust fullstack applications and great integrated software play key roles.

We operate across the Nordics (DK FI SE NO) with a small flat and informal organization of 40 engineers designers researchers and a distributed setup across all countries where we work from home and offices depending on preferences and needs.

Tax Yes tax filings and tax law are the domains we design and build for so having an interest in those areas would be good. Actual experience and domain knowledge are of course a plus but certainly not a requirement. Its a pretty small Venn diagram of senior fullstack engineers who also have professional tax experience.

Above all we value working with good all-round people. People who are both highly specialized but are capable of collaborating across disciplines.

About You

As a fullstack engineer you will be entrusted with building comprehensive tax automation tools and AI-integrated platforms across several business-critical products working with both frontend and backend technologies.

As a master of your craft you will write beautiful and performant React/TypeScript applications and robust services. Code that is well-tested documented optimized for speed and easy to maintain across the full technology stack.

You have honed those skills over the years by working on complex fullstack applications in cross-functional product teams where you have shown yourself as a wonderful collaborator who can seamlessly bridge frontend user experiences with backend system design.

You have likely also done many code reviews across the stack and taken initiative to question architectural decisions made by people more senior in the company than yourself. And challenged product decisions that didnt make sense from a technical feasibility perspective.

If that sounds like you we should the meantime heres more information about the work and our team.

Your Key Responsibilities

• Building end-to-end tax automation features from React frontends to backends
• Developing AI-integrated platforms with seamless user experiences and robust data processing
• Close collaboration with designers product managers ML engineers and fellow developers
• Spending time occasionally with users and user researchers to understand tax workflows in detail
• Working across a range of products and problem spaces in the fullstack domain
• Freedom to work remotely or in our Copenhagen or Stockholm office

Skills And Attributes for Success

We are looking for a skilled fullstack engineer and a great colleague. These are the most important things that should characterise you.

To qualify for the role you should have:

Frontend Expertise (Required):

• React/TypeScript: 3 years with modern hooks state management and performance optimization
• Modern Tooling: Experience with build tools (Vite/webpack) testing frameworks (Cypress/Jest) and Kubernetes deployments
• Complex UI Development: Building multi-step workflows sophisticated form validation and responsive interfaces

Backend Proficiency (Required):

• : 3 years with Express async programming and RESTful API development
• MongoDB: Strong experience with document design aggregation pipelines and performance optimization
• Python Integration: Experience with FastAPI report generation and GenAI pipeline integration
• System Integration: Third-party API integration microservices patterns and MCP implementations

Experience Level Requirements:

For Mid-Level Candidates (3-5 years):

• 3 years fullstack development experience with shipped major features
• Solid understanding of full development lifecycle from design to deployment
• Proven cross-functional team collaboration experience

For Senior Candidates (5 years):

• 5 years with increasing technical responsibility
• Experience mentoring developers and making technical architectural decisions
• System design knowledge and scalability considerations
• Project leadership capabilities and scope definition skills

Additional Requirements:

• Easy access to Copenhagen Helsinki or Stockholm. You can work remotely most of the time but we meet up in person weekly
• Really good English speaking and writing skills. Thats our work language
• An interest in tax law and financial technology applications

What We Look For

We obviously want you to be a skilled fullstack developer but we believe that a mid-to-senior engineer is so much more than that. We are looking for a colleague who is

• A real craftsperson and a stickler for details across both frontend and backend code
• Delightful to be around and able to communicate technical concepts to both technical and non-technical stakeholders
• A clear communicator who can bridge the gap between user experience and system architecture
• Supportive and helpful in mentoring junior developers and sharing knowledge
• Quick to solve complex problems spanning the entire technology stack
• Questioning technical approaches and architectural decisions before committing to implementation
• Eager to learn about both advancing fullstack technologies and tax domain complexities
• Comfortable working in 6-week Shape Up cycles with autonomous project ownership
• Practical engineering mindset focused on shipping solutions that matter to users

What We Offer

• A tech product team: Digital product organization as a unit operates mostly product- and user-driven even though we are situated within a large consultancy organization
• Direct access to users: Your fullstack solutions will directly impact tax professionals who are quite literally right next to you providing immediate feedback on both UX and system performance
• Full-stack ownership: Take features from concept to deployment with complete technical ownership
• Shape Up methodology: Work in focused 6-week cycles with clear scope and technical autonomy
• Technology growth: Work with other great Engineers on React patterns performance optimization and AI integration challenges among other things.
• Good food and good times: We take good care of the people who dedicate their working hours to our cause
• Diverse and inclusive culture: Youll be embraced for who you are and empowered to use your voice to help others find theirs

To learn more about EY and what its like to work here please follow us on EY Careers Career blog and social media.

Please apply with your CV and Cover Letter. We review applications on a continuous basis so please apply right away but no later than 11.8.2025. For questions regarding the role do not hesitate to contact For any questions regarding the recruitment process please contact.
We look forward to your application.

At EY well develop you with future-focused skills and equip you with world-class experiences. Well empower you in a flexible environment and fuel you and your extraordinary talents in a diverse and inclusive culture of globally connected teams. Learnmore.

Are you ready to shape your future with confidence Apply today.

To help create an equitable and inclusive experience during the recruitment process please inform us as soon as possible about any disability-related adjustments or accommodations you may need.