Tech Summer Internship 2026

20 hours ago

Kungsbron Stockholm Sweden Sweden CatalystOne Full time 400,000 - 1,200,000 per year


Hello tech-minded students

Do you want to challenge yourself in modern system development while also contributing to real customer projects? As a Tech Summer Intern with us at CatalystOne Engage, you'll spend 10 weeks as part of our experienced development team within Engage – where ideas quickly turn into reality.

What does the role involve?

You'll work on a concrete development project that matches both your skills and our needs – anything from front-end and back-end development to data analysis. The projects are linked to our product and give you hands-on experience building solutions that our customers actually use.

Your responsibilities

As an intern, you'll drive development work in close collaboration with our experienced developers. You'll be responsible for designing, implementing, and testing your solution, and at the end of the summer you'll present your results to the team. We'd like you to have some experience in web development, whether from studies, personal projects, or previous internships. It's particularly valuable if you've worked with .NET and , as these are technologies we frequently use in our daily work.

The team you'll be part of

You'll join a strong and experienced tech team made up of full-stack and front-end developers as well as data scientists. There's many years of collective experience to learn from, along with an open culture where new ideas are welcomed. Previous interns have grown into permanent roles after completing the program.

CatalystOne Engage

What will you gain from the summer?


• Discuss future opportunities within the company.

• Practical experience in a modern tech stack with support from senior developers.

• The chance to contribute to real projects that reach our customers directly.

"During my internship, I had a fantastic opportunity to influence and contribute to CatalystOne Engage's operations through challenging and inspiring projects spanning different areas. I constantly felt encouraged to bring new ideas in a fast-paced and flexible work environment."
- Hugo Eriksson. Business Analyst & previous summer intern at CatalystOne Engage.

Application deadline: December 31, 2025. Please send us your CV along with a copy of your most recent academic transcript. Instead of a traditional cover letter, we'd like you to provide a short pitch explaining why you're interested in this internship. If you have a GitHub (or similar) profile showcasing sample code, side projects, or contributions, we'd love to see it. 

The recruitment process will start at the beginning of 2026, but positions may be filled on a rolling basis – so don't wait to apply

Want to read about a previous Tech Intern that now works as a Full-Stack Developer at CatalystOne Engage? Read Alexander's story here: From Intern to Full-Stack Developer at CatalystOne Engage


CatalystOne does not accept unsolicited resumes from search firms/recruiters. CatalystOne will not pay any fees to search firms/recruiters if a candidate is submitted by a search firm/recruiter unless an agreement has been entered into with respect to the specific open position(s). Search firms/recruiters submitting resumes to CatalystOne on an unsolicited basis shall be deemed to accept this condition, regardless of any other provision to the contrary.

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