Full Stack Developer – Java & Modern Frontend

Permanent position at Twoday | Copenhagen

Full Stack Developer – Java & Modern Frontend

Twoday is looking for experienced Full Stack Developers to join our Digital Engineering organisation and work with business-critical digital solutions within the Danish healthcare sector.

You will work across backend and frontend development in a complex environment where software quality, integration, security and operational stability are essential.

The role

As a Full Stack Developer, you will contribute throughout the development lifecycle – from technical design and backend services to user interfaces, testing, deployment and production support.

Your responsibilities will include:

• Developing and maintaining Java-based backend applications

• Developing REST APIs and system integrations

• Developing modern frontend applications using JavaScript and TypeScript technologies

• Working with Spring and Spring Boot

• Integrating frontend applications with backend services and APIs

• Working with relational databases and data-driven applications

• Developing automated unit and integration tests

• Participating in code reviews and technical design

• Supporting CI/CD, deployment and production operations

• Troubleshooting complex issues across frontend, backend and integrations

• Contributing to modernisation and reduction of technical debt

• Collaborating with architects, DevOps Engineers, testers and other development teams

• Working effectively across organisational and supplier boundaries

What we're looking for

You have:

• Strong professional software development experience

• Professional Java experience

• Experience with Spring and preferably Spring Boot

• Strong experience with JavaScript and/or TypeScript

• Experience developing REST APIs and integrations

• Experience with SQL and relational databases

• Experience with modern frontend frameworks

• Experience with Git and modern development workflows

• Experience with automated testing

• Understanding of CI/CD and modern software delivery

• Experience from complex enterprise environments

Experience with Docker, Kubernetes, Kafka, messaging, Jenkins, Azure DevOps or Infrastructure as Code is an advantage.

Experience from digital healthcare is highly valued. We are particularly interested in developers who have worked with national healthcare solutions, healthcare integrations, healthcare data or other critical systems within the Danish healthcare sector.

Experience from complex public sector systems and multi-supplier delivery environments is also valuable.

Fluent Danish, both written and spoken, is required.

You must be able to work onsite at the customer location in Copenhagen when required, which may include five days per week.

What we offer

At Twoday, you'll join one of the leading technology consultancies in the Nordics. You will be permanently employed by Twoday and work on long-term, business-critical customer engagements while remaining part of our professional engineering community.

We offer challenging projects, strong technical communities, continuous professional development and the opportunity to work with solutions that have significant societal impact.

You will join Twoday as a permanent employee and become part of a strong professional community across software engineering, architecture, cloud and data.

You'll work on long-term, business-critical customer engagements while continuing to develop your expertise within Twoday's engineering community.

Working at Twoday

Twoday is a leading technology consulting company specializing in applied AI and advanced engineering. With around 2,300 experts in AI, data, digital engineering, and cloud engineering, we cut through complexity, remove uncertainty, and prove the value of technology.

Our purpose is to create a better tomorrow through AI and technology. We strengthen private and public organizations across energy and utilities, financial services and insurance, industrials and manufacturing, health and life sciences, and government.

However, our greatest strength isn't the technology we work with. It's the people behind it. Every day, they bring together expertise, curiosity, and determination to help our customers solve complex challenges and create lasting value.

We are committed to building an inclusive and diverse workplace where everyone is treated with respect and has equal opportunities. Our recruitment decisions are based on competencies, experience, and individual merit.

Don’t meet all the requirements? Many candidates hesitate to apply unless they meet every qualification. We are looking for people who are engaged, meet most of the criteria, and are motivated to grow in the role. If this role interests you and you believe you could be a good fit, we encourage you to apply.