Senior Fullstack Engineer

Copenhagen - Denmark

Monthly Salary: Not Disclosed

Posted on: Yesterday

Vacancies: 1 Vacancy

Job Summary

At EY were all in to shape your future with confidence.

Well help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go.

Join EY and help to build a better working world.

The Opportunity

We are looking for a great colleague to join our EY Tech People team as a Senior Fullstack Engineer where you will play a pivotal role in building innovative tax automation tools and AI-integrated platforms across several business-critical products. Our mission is to enhance efficiency quality and satisfaction in tax and compliance workflows serving thousands of clients with accurate and compliant tax filings. As part of a dynamic organization operating across the Nordics (DK FI SE NO) you will collaborate with a talented group of engineers designers researchers and product managers in a flat informal structure. While experience in tax law is beneficial a passion for technology and collaboration is what we truly value.

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 withdesigners product managers and fellow developersas well as sparring with users and researchers to understand tax workflows in detail

Contributing to internal tooling and developer experience including AI-assisted development workflows MCP server implementations and prompt libraries

Working across a range of products and problem spaces in thefullstackdomain

Skills and Attributes for Success

To thrive in this role you possess a strong foundation in both frontend and backend technologies. To qualify for the role you should have:

Frontend Expertise (Required):

React/TypeScript: Extensive experience with modern hooks state management and performance optimization

Modern Tooling: Experience with build tools (Vite/webpack) testing frameworks (Cypress/Playwright) and Kubernetes deployments

Complex UI Development: Building multi-step workflows sophisticated form validation and responsive interfaces

Backend Proficiency (Required):

: Extensive experience with Express async programming and RESTful API development

MongoDB: Strong experience with documentdesign aggregation pipelines and performance optimization

Python Integration: Experience withFastAPI report generation and GenAI pipeline integration

System Integration: Third-party API integration microservices patterns and MCP implementations

What We Look For

We are seeking a detail-oriented Fullstack Engineer with the ability to communicate technical concepts clearly with both technical and non-technical stakeholders. We imagine you as someone quick to solve complex problems and with the ability to question technical approaches and challenge architectural decisions. You are also eager to learn about advancements in fullstack technologies and tax domain complexities. A practical engineering mindset focused on delivering impactful solutions will help you succeed in this role. Furthermore our new colleague is someone who embodies more than just technical expertise. We are looking for a supportive team member ready to share knowledge and help others grow. You are based in either Copenhagen Helsinki or Stockholm.

What We Offer

A tech product team:EYsTech Peopleorganizationas a unitoperatesmostly product- and user-driven even though we are situated within a large consultancyorganization

Direct access to users: Yourfullstacksolutions will directlyimpacttax 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

Technology growth: Work withother great Engineers onReact patterns performance optimization and AI integration challengesamong other things.

Good foodand good times: We takegood careof the people who dedicate their working hours to our cause

Diverse and inclusive culture:Youllbe embraced for who you are and empowered to use your voice to help others find theirs

Please apply with your CV and Cover Letter no later thanMarch 22nd 2026. We review applications on an ongoing basis so please apply right away. For questionsregardingthe role do not hesitate to contactIf questionsregardingthe recruitment process please contact . We look forward to your application!

EY Building a better working world

EY is building a better working world by creating new value for clients people society and the planet while building trust in capital markets.

Enabled by data AI and advanced technology EY teams help clients shape the future with confidence and develop answers for the most pressing issues of today and tomorrow.

EY teams work across a full spectrum of services in assurance consulting tax strategy and transactions. Fueled by sector insights a globally connected multi-disciplinary network and diverse ecosystem partners EY teams can provide services in more than 150 countries and territories.

Required Experience:

Senior IC

At EY were all in to shape your future with confidence.Well help you succeed in a globally connected powerhouse of diverse teams and take your career wherever you want it to go.Join EY and help to build a better working world.The OpportunityWe are looking for a great colleague to join our EY Tech Pe...