Senior Java Backend Developer - Digital Health

Twoday is the leading digital transformation partner in Northern Europe with a global presence. With approximately 3,000 specialists, we collaborate with some of the most admired private and public organisations to deliver cutting-edge digital solutions. Our expertise spans software engineering, Data & AI, cloud platforms, digital experiences and business applications. We are now looking for a Senior Platform Engineer to help transform a large-scale development and deployment platform from traditional DevOps into a modern AI-assisted and agentic engineering setup. Permanent position at Twoday | Copenhagen Senior Java Backend Developer – Digital Health Digital Engineering | Copenhagen Build software that matters We are looking for experienced Java developers to join Twoday and work with long-term, business-critical digital solutions within the Danish healthcare sector. You will become part of a complex engineering environment where applications, integrations and large volumes of data need to work reliably together. Several development teams and suppliers collaborate across the delivery, making strong engineering practices, clear communication and shared responsibility essential. We are looking for developers who are equally comfortable building new functionality and understanding existing systems that have evolved over time. What You Will Be Doing As a Senior Java Backend Developer, you will take an active role throughout the software development lifecycle, from technical clarification and design through implementation, testing and production. Your responsibilities will include: Developing and maintaining backend solutions using Java and Spring/Spring BootDesigning and implementing APIs and system integrationsWorking with distributed and event-driven systemsDeveloping secure, robust, testable and maintainable softwareWriting automated tests and participating in code reviewsTroubleshooting across applications, integrations and data flowsContributing to the modernisation of existing solutions and reduction of technical debtCollaborating closely with architects, testers, DevOps specialists and other developersTaking ownership of your work from clarification and design through to implementation and operation Depending on the team and solution, you may work with technologies and principles such as Java, Spring Boot, REST, SOAP, Kafka, messaging, OAuth2/OIDC, microservices, Domain-Driven Design, event-driven architecture, SQL, Git, Docker and CI/CD. What We Are Looking For You have solid professional experience in Java backend development and are accustomed to working with complex systems where integration, stability and software quality matter. We are particularly interested in experience across several of the following areas: Java and Spring/Spring BootREST APIs and system integrationAsynchronous communication and messagingKafka or similar event-based technologiesMicroservices and distributed systemsRelational databases and SQLAutomated testingGit and CI/CDSecurity in modern applications and APIsProduction support and troubleshooting of business-critical systems Experience within digital healthcare or the public sector is a strong advantage, particularly if you have worked with national healthcare solutions, healthcare integrations, healthcare data or similarly complex application landscapes. Experience working in environments where several suppliers and development teams collaborate on a shared delivery is also valuable. Professional fluency in Danish, both spoken and written, is required. You must also be able to work onsite at the customer location in Copenhagen when required. Why Twoday? At Twoday, you are not hired for one technology or one customer assignment. You become part of a wider professional community across software engineering, architecture, cloud, data and AI. We work with digital solutions that businesses, public organisations and citizens depend on every day. You will have the opportunity to apply your experience to meaningful challenges while continuing to develop professionally alongside highly skilled colleagues. About Twoday Twoday operates from modern offices across 30 locations in Norway, Sweden, Denmark, Finland, and Lithuania. We have a strong and unique social environment with highly engaged employees. If you are the candidate we are looking for, you will play a central role with exciting opportunities to grow within an international and innovative group, working on cutting-edge technology and software solutions. You will also have the flexibility to occasionally work from one of our main offices in Oslo, Stockholm, Copenhagen, Helsinki or Vilnius. Diversity & inclusion Do you not meet all the requirements? Studies show that women and minorities are less likely to apply for a job if they don’t meet every qualification. At Twoday, we are committed to building a workplace and community where everyone is welcome. If you are excited about this role but your previous experience doesn’t perfectly align with the job description, we still encourage you to apply.