In short

Whether you’re looking to jump start your career or gain first hands-on experience in a new field, an internship at On offers you a unique growth experience, the chance to make an impact from day 1 and contribute to On’s growth journey. We are looking for fresh ideas, curious minds and passionate individuals ready to make a difference. Our internships generally last 6 months and you will be fully embedded in a team.

  • Start date: Sept 1
  • Duration: 6 months
  • Prerequisite: Interest in area relevant to the internship, passion for On, right to work in EU / Switzerland
  • Note: This is a paid internship
  • If you don't meet the criteria above, unfortunately, we cannot move forward with your application. Please be truthful in your answers, the recruiter reviewing your application will appreciate your honesty.

Curious about life as an intern at On? We recommend watching the recording of our previous livestream (https://www.careerfairy.io/company/On_AG/livestream/eCaoLI8t0mYLqzRYM1eq) to hear former interns share their internship experience, get an insider’s look at different departments and pick up some tips and tricks from our recruiters to help you ace the application process! Please note that the next internship program kicks off on March 1 (not September 1 as mentioned in the livestream).

Your Mission

Are you excited about learning how scalable backend systems are built and how data powers global products? Join On’s Product Core Technology team as a Backend Engineering Intern, where you’ll contribute to building the systems that enable our product data to flow across our digital ecosystem — from design and development to ecommerce and marketing. This internship offers a unique opportunity to work on meaningful challenges at the intersection of product data, backend systems, and digital experiences. You’ll be part of a team that builds GraphQL APIs, Kafka-based streaming systems, and backend services that power On’s website, mobile app, and internal platforms. If you’re curious, eager to learn, and ready to grow your backend development skills in a fast-paced and collaborative environment, we’d love to hear from you!

In Your First Month:

  • Get to know On’s product data landscape, tools, and engineering practices
  • Shadow senior engineers and participate in team rituals like stand-ups, code reviews, and pair programming
  • Contribute to small tasks or improvements in our services and documentation

After Three Months:

  • Help implement new features or improvements to internal tools, APIs, or data flows
  • Contribute to the development of backend services in TypeScript and Node.js
  • Learn how event-driven systems (e.g. Kafka) are used in large-scale data pipelines

Beyond:

  • Own on intern-level projects that improve data visibility, tooling, or developer workflows
  • Present what you’ve built to the team and gather feedback
  • Take initiative in learning new backend concepts and frameworks used in production systems.
Group of girls smiling
  • Man and woman sat at desks talking
  • Open planned office with men and women sat on a a large curved sofa
  • Group of runners talking outside the office
  • A team of people sat on the steps with a view of mountains outside the office.
  • Two women smiling at each other in a meeting room with large curved windows
  • A group of people sat around a table looking at large design papers
  • 3 men sat around with laptops smiling at each other
  • a large group of runners holding an On flag smiling at the camera
  • Man and woman sat at desks talking
  • Open planned office with men and women sat on a a large curved sofa
  • Group of runners talking outside the office
  • A team of people sat on the steps with a view of mountains outside the office.
  • Two women smiling at each other in a meeting room with large curved windows
  • A group of people sat around a table looking at large design papers
  • 3 men sat around with laptops smiling at each other
  • a large group of runners holding an On flag smiling at the camera
  • Man and woman sat at desks talking
  • Open planned office with men and women sat on a a large curved sofa
  • Group of runners talking outside the office
  • A team of people sat on the steps with a view of mountains outside the office.
  • Two women smiling at each other in a meeting room with large curved windows
  • A group of people sat around a table looking at large design papers
  • 3 men sat around with laptops smiling at each other
  • a large group of runners holding an On flag smiling at the camera

Your story

  • Some experience with backend development — ideally with Node.js and TypeScript (through personal projects, coursework, or previous internships)
  • Curious about APIs (especially GraphQL), databases (SQL or NoSQL), and cloud systems
  • Eager to learn event-driven architecture and real-world data engineering patterns
  • A team player who communicates clearly and enjoys collaborating
  • Enthusiastic about data, technology, and building tools that help others

Bonus Points

  • You’ve built or contributed to a backend or data-related project (personal, academic, or open-source)
  • Git, tooling and deployment patterns
  • Interest in how products are developed and brought to market
  • A passion for sports, technology, or both!
two women sitting at a table talking with laptops

About the Team

At On, we believe in learning by doing. As an intern on the Product Core Technology team, you’ll gain hands-on experience with systems that support a fast-growing global brand. You’ll work alongside talented engineers, product managers, and data experts — and have the chance to shape real features and tools. This is more than just an internship — it’s a launchpad. If you’re ready to grow, make an impact, and learn from the best, we’d love to meet you.

See more
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A man in a blue shirt and a white t-shirt with a headset on is standing with his arms crossed and holding his chin looking into the distance

Explorer

Explorer

Woman laughing as she plays ping pong in the office!

Our team exists to think differently. Wild curiosity and a thirst for knowledge keeps moving our tech forward. There are no boxes here. We’re always dreaming of what’s possible – and searching for new ways to get there. 

Learn about out Spirits
  • Portrait of a woman smiling in the On Zürich office

    Gioia

    Head of Operations Project Portfolio Management

    My journey has evolved for sure and, actually, change can lead to infinite possibilities. Those core values that were there when I joined are still here today and I really find them extraordinary every day.
  • A man standing in a modern office looking at the camera, smiling slightly.

    Vivek

    Director of Engineering

    We’re closely connected to the whole business. Every day, we’re making quick decisions to improve the customer experience. Because these live changes impact the whole business, we deeply respect individual opinion and what others think about the end customer experience.
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What we offer

On is a place that is centered around growth and progress. We offer an environment designed to give people the tools to develop holistically – to stay active, to learn, explore and innovate. Our distinctive approach combines a supportive, team-oriented atmosphere, with access to personal self-care for both physical and mental well-being, so each person is led by purpose.

On is an Equal Opportunity Employer. We are committed to creating a work environment that is fair and inclusive, where all decisions related to recruitment, advancement, and retention are free of discrimination.

Build the better you

What to expect

We want to set everyone up for success, so here’s the lowdown on how we hire. Our process is a two-way street – bringing you into our culture, while helping us learn how you think.

Our full process can last about eight weeks from application to offer, because we care about getting it right. These steps explain how we usually do things.

Before you get started, feel free to consider if you want to work with us. Strange question? Well, we give people a lot of space to navigate their day-to-day and that style isn't for everyone. We want you to be passionate about what you do and be sure this is the right fit. Because when skills and passion combine – it creates that 'Wow' moment.