Tech Summer Internship 2026
Join CatalystOne Engage as a Tech Summer Intern and spend the Summer of 2026 turning ideas into reality while contributing to real customer projects alongside an experienced development team
Hello tech-minded students! 👩💻👨💻
Are you looking for a hands‑on software engineering internship where you’ll build real product functionality used by real customers?
As a Tech Summer Intern at CatalystOne Engage, you’ll spend 10 weeks embedded in our experienced development team, working on a clearly defined development project within our product.
What you'll work with
This internship is focused on web-based product development. Projects typically involve:
Backend development in .NET (C#)
Front‑end development using Vue.js
Working with existing production codebases, APIs, and data models
You will work on a concrete problem that has real business and customer impact, not a demo or throwaway project.
Your responsibilities
Design and implement a solution to a defined technical problem
Write production-quality code with guidance from senior developers
Test, iterate, and improve your solution based on feedback
Present your results to the development team at the end of the internship
You’ll be expected to work independently, while collaborating closely with experienced developers for guidance and reviews.
Who we're looking for
This internship is a good fit if you:
Are a final‑year bachelor’s student or a first‑year master’s student in Computer Science, Software Engineering, or a related technical field
Have practical experience with web development, from studies, personal projects, or previous internships
Have worked with .NET/C# and/or modern JavaScript frameworks (Vue.js is a strong plus)
Are comfortable reading and navigating an existing codebase
Enjoy solving concrete technical problems rather than theoretical exercises
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: May 10, 2026. 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 is ongoing and 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.
- Department
- CatalystOne Engage
- Locations
- Stockholm office
About CatalystOne
CatalystOne is a Scandinavian leader of HCM-software with over 250 employees throughout Norway, Sweden, Denmark, and India. We have, since 2004, built a strong value-based company driven by our customers' success. Our culture is characterized by a unique combination of emphasis on results and on people. We have experienced high growth in recent years and have the ambition to continue this growth both in Scandinavia and in other North-European countries.
CatalystOne is an equal opportunity employer that is committed to diversity and inclusion in the workplace. We prohibit discrimination and harassment of any kind based on race, colour, sex, religion, sexual orientation, national origin, disability, genetic information, pregnancy, or any other protected characteristic.
Fair Screening in our Recruitment process
To promote fairness and reduce unconscious bias, candidates are anonymised during the initial screening stage. This means applications are reviewed based on skills, experience, and relevance to the role – not personal characteristics. Once shortlisted, recruiters review the full candidate profile and engage directly with candidates throughout the process.
Use of AI
We use AI‑supported tools in parts of our recruitment process to help structure and summarise applications, support screening, and transcribe interviews. These tools assist our recruiters but do not make decisions on their own – all evaluations and hiring decisions are made by people.