Permanent position at Twoday | Copenhagen
Senior Java Developer
Would you like to develop new digital solutions that support collaboration across the Danish criminal justice system? We are looking for an experienced Java Developer to join Twoday, with your first assignment being for a major public-sector customer in Copenhagen.
Your role
You will join a team developing a new solution that supports digital collaboration across public authorities. Your primary focus will be backend development in Java, although you will work closely with a frontend built in Vue.js.
Your responsibilities will include:
Developing new backend functionality in Java and Spring Boot
Designing and implementing APIs and event-driven integrations
Writing automated unit and integration tests
Working with database changes and data models
Contributing to code reviews, technical discussions and solution design
Troubleshooting and maintaining quality throughout the delivery process
Collaborating with developers and stakeholders across organisational boundaries
Technology stack
The core backend stack includes:
Java 25
Spring Boot 3.5
OpenAPI 3
Kafka
Spock
Liquibase
Microsoft SQL Server
Azure DevOps
Docker
Helm
Gradle
The frontend is built with Vue.js 3.5, TypeScript, pnpm, Quasar, Vite and Cypress. Frontend experience is not required, but experience with Vue.js would be an advantage.
A limited part of the solution integrates with the Danish Police using JAX-WS, Apache CXF 4, SOAP and XML. Experience with these technologies would be beneficial, but is not a requirement.
About you
We expect you to have:
Several years of professional Java development experience
Strong hands-on experience with Spring Boot
Experience developing APIs and integrations
Experience with automated testing and modern development practices
An understanding of CI/CD, containerisation and deployment
The ability to work independently while contributing actively to the team
Strong communication skills and an interest in understanding complex business domains
Professional fluency in Danish and English
Able to work full time onsite in Copenhagen
Experience with Kafka, Spock, Liquibase or public-sector solutions would be an advantage.
Working at Twoday
At Twoday, you will become part of a strong professional environment where collaboration, knowledge sharing and high-quality software development are central. You will work closely with experienced colleagues while helping our customers digitalise complex and socially important processes.
The position is based in Copenhagen and requires full-time onsite presence with the customer.
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.
Diversity and inclusion
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.
Skills Required
- Several years of professional Java development experience
- Hands-on experience with Java and Spring or Spring Boot
- Experience with integrations and REST-based services
- Experience maintaining or modernizing existing enterprise applications
- Strong understanding of automated testing and software quality
- Experience with CI/CD and modern development workflows
- Ability to work independently while contributing actively to the team
- Strong communication skills and interest in understanding the business domain
- Professional fluency in Danish and English
- Experience from large, regulated, or public-sector organizations
Twoday Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Twoday and has not been reviewed or approved by Twoday.
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Wellbeing & Lifestyle Benefits — Benefits are highlighted with lunch, culture/sport/wellness allowances, social activities, and wellbeing programs in at least Finland. These indicate a modern perks set that supports day-to-day quality of life where available.
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Healthcare Strength — Healthcare coverage and mental-wellbeing services are included in a Finland role. This points to robust health-related support in that location.
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Equity Value & Accessibility — A co-ownership program allows employees to invest in the company and share in value creation. While availability may vary by country, the option signals potential long-term value for participants.
Twoday Insights
What We Do
Twoday is a Nordic technology company that provides end-to-end IT services, including software engineering, data and AI solutions, and business applications. They partner with organizations in both the public and private sectors to drive digital transformation and improve operational efficiency through the strategic application of advanced technology and data-driven insights.
