Careers at Thermo-Calc

Are you ready to take a key role in a growing and innovative tech company with a global reach? Thermo-Calc Software in Solna, Sweden, is looking for a passionate Java Developer to join our mission of developing the next generation of advanced applications in materials science. Here, you’ll collaborate with researchers and engineers in a dynamic environment where your code truly matters — all over the world.

We offer a workplace where technology, curiosity, and collaboration go hand in hand. You’ll be part of a team developing high-performance solutions for materials calculations, supporting industries and research institutions in understanding and predicting material behavior. Help us shape the Future of Materials Science!

Qualifications

• Solid experience with Java and traditional GUI frameworks (such as Swing or JavaFX)
• Strong skills in object-oriented programming and design patterns
• Experience with large and long-living monolithic applications
• Experience building user-friendly and responsive interfaces
• Ability to write clean, maintainable, and efficient code
• Proficiency with version control tools such as Git
• Excellent communication skills in English, both written and spoken
• A degree in Computer Science or equivalent experience

Meritorious

• Experience in web development (e.g. React, TypeScript, Fastify, Spring Boot)
• Familiarity with Windows, Linux and macOS development environments
• Interest in science or engineering-related technology

Responsibilities

As a Java Developer at Thermo-Calc Software, you’ll play a central role in the development and maintenance of our sophisticated desktop application, primarily using Java with a strong focus on the graphical user interface built in Swing. You’ll also be involved in shaping our next-generation web-based platform, working closely with frontend and FORTRAN developers using a modern tech stack that includes React, TypeScript, Fastify, Spring Boot, and Azure.

In this role, you’ll write clean, efficient, and well-documented code, while continuously collaborating with colleagues and stakeholders to define and implement new features. Your keen eye for detail and performance will be crucial as you troubleshoot and fine-tune application functionality to ensure a seamless user experience.

You’ll be part of a team that values code quality and collective ownership — participating in code reviews and contributing to high engineering standards. Staying current with the latest technologies and best practices in Java development is part of your mindset, and you’ll apply this knowledge to build secure, scalable, and reliable software solutions that make a real impact.

You will work in a broad role and be involved in areas such as:

• Develop and maintain our comprehensive Java-based desktop application, with a strong focus on the graphical user interface (Swing)
• Contribute to the development of our next-generation web-based platform alongside frontend and FORTRAN developers
• Write clean, efficient, and well-documented code
• Collaborate closely with team members and stakeholders to define and implement new features
• Troubleshoot and optimize application performance
• Participate in code reviews and help maintain high technical standards across the team
• Stay up to date with modern technologies, tools, and best practices in Java development
• Ensure the security, scalability, and reliability of our software solutions.

Compensation and Benefits

Thermo-Calc Software takes actions to be an attractive employer that not only offers competitive compensation and benefits, but also a stimulating environment to work in with colleagues from all over the world. Our head office is located in Solna with a light and modern environment and short walking time to Solna station and Mall of Scandinavia. Our company values a spirit of teamwork and inclusiveness where we all work together to create the best possible products and services for our users. We also offer all employees:

• A comprehensive health and benefits package that includes extended health coverage, regular health checks, pension, and a generous bonus.
• Continuing education opportunities in the areas that you would like to develop.
• A flexible work schedule which includes flex time and the opportunity to work from home.

How to Apply

Selection is ongoing, so please submit your application as soon as possible. We are collaborating with Randstad Digital for this recruitment. If you have any questions about the position or the process, you are welcome to contact Julia Rhönnstad at julia.rhonnstad@randstad.se. Welcome to a workplace where your code truly matters.

Apply Today!

Are you ready to create intuitive, modern user experiences for complex scientific tools? Thermo-Calc Software in Solna, Sweden, is looking for a skilled Frontend Developer (React) to join our passionate team in shaping the future of materials science software.

We’re a fast-growing tech company at the intersection of engineering, research, and user-centered design. With customers around the globe and a product that truly makes a difference in research and industry, your frontend skills will directly contribute to innovation in materials development, sustainability, and beyond. Help us build the Future of Scientific Software!

Qualifications

• Strong experience with React and modern JavaScript/TypeScript frameworks
• Solid understanding of frontend architecture and state management (e.g. Redux, Context)
• Solid understanding of HTML5, CSS3, and modern CSS frameworks (e.g., SASS, Styled Components, Tailwind)
• Experience with REST APIs and integrating complex backend logic into the UI using tRPC
• Familiarity with version control systems like Git and Continuous Integration such as Jenkins
• Strong communication skills and a collaborative mindset
• A degree in Computer Science or equivalent experience

Meritorious

• Knowledge of backend tools like Java Spring Boot
• Familiarity with cloud platforms (Azure, AWS, or Google Cloud)
• Exposure to containerization tools (Docker, Kubernetes)
• Experience integrating scientific or numerical code into a GUI
• Agile development experience (Scrum, Kanban, etc.)

Responsibilities

As Frontend Developer, you’ll take a leading role in developing the user interface for our next-generation web platform. Working in a cross-functional environment with backend developers, FORTRAN specialists, designers, and scientists, you’ll ensure that complex scientific workflows are transformed into elegant, user-friendly web applications.

You’ll primarily work with React, TypeScript, and modern frameworks such as Fastify, alongside Spring Boot and Azure on the backend. Your focus will be on delivering robust, scalable, and visually intuitive frontends that meet high technical and usability standards.

In this role, you will:

• Design and build dynamic, interactive web interfaces using React and TypeScript
• Collaborate with backend and scientific developers to integrate advanced functionality
• Maintain a high standard of UI performance, accessibility, and responsiveness
• Contribute to architectural decisions and continuous improvement processes
• Participate in code reviews and team discussions to maintain quality and consistency
• Stay updated on frontend trends, tools, and best practices

Compensation and Benefits

Thermo-Calc Software takes actions to be an attractive employer that not only offers competitive compensation and benefits, but also a stimulating environment to work in with colleagues from all over the world. Our head office is located in Solna with a light and modern environment and short walking time to Solna station and Mall of Scandinavia. Our company values a spirit of teamwork and inclusiveness where we all work together to create the best possible products and services for our users. We also offer all employees:

• A comprehensive health and benefits package that includes extended health coverage, regular health checks, pension, and a generous bonus.
• Continuing education opportunities in the areas that you would like to develop.
• A flexible work schedule which includes flex time and the opportunity to work from home.

How to Apply

Selection is ongoing, so please submit your application as soon as possible. We are collaborating with Randstad Digital for this recruitment. If you have any questions about the role or the process, feel free to contact Julia Rhönnstad at julia.rhonnstad@randstad.se. Welcome to a workplace where your code truly matters.

Apply Today!