In short
Our Direct-to-Consumer (DTC) business continues to perform and grow strongly, and we’re looking for a Backend Engineer within the Loyalty team in Commercial Technology to help scale On's online business to the next level. The Loyalty team is building the backbone of On’s customer engagement and retention platform, powering personalized experiences, membership programs, and reward mechanisms across our global ecosystem. As a Backend Engineer, you’ll design, build, test, deploy, and operate digital services that shape how millions of consumers connect with On. You’ll be based in our Berlin office, working in close collaboration with cross‑functional teams in Zurich, London, and other global hubs.
Responsibilities
* Build and maintain the Loyalty (DTC) platform by providing APIs, real‑time events, and documentation to reduce cognitive load and enable stream‑aligned teams to rapidly deliver premium, personalized experiences across all consumer touch points.
* Iteratively deliver value and quality with solutions to meet both technical and internal consumer needs.
* Provide services, events, and documentation that enable stream‑aligned teams to quickly build on top of the customer platform.
* Build, release and operate complex systems, owning and evolving the architecture (by leading decision making through RFCs) that scales for millions of customers worldwide.
* Participate in and drive architectural decision‑making through RFCs and design reviews to ensure scalability and resilience.
* Take responsibility for reliability, uptime, and operational excellence in production environments.
* Act as an expert in the given technology area, leveraging best‑in‑class engineering practices including continuous integration and deployment, code reviews, high test coverage, and observability.
* Collaborate effectively through verbal and written communication with diverse teams and stakeholders, driving alignment beyond the team.
* Engage in the engineering community by sharing knowledge, mentoring teammates, providing feedback, and supporting hiring.
* Contribute to the broader On engineering community, fostering a culture of learning and craftsmanship.
Qualifications
* 5‑6 years of backend experience designing, building, testing, releasing, and operating scalable systems with a strong problem‑solving mindset and full accountability.
* Strong experience within the Node.js (TypeScript) ecosystem and basic understanding of Ruby; experience with GraphQL and NestJS is a bonus.
* Experience working with and designing distributed systems; competent in building event‑driven systems (e.g., using Kafka).
* Mastered automated testing, TDD, performance debugging tools, and hands‑on operation of infrastructure on AWS or GCP.
* Comfortable using containerized workloads and clusters like Kubernetes.
* A facilitation mindset, providing constructive feedback and guiding peers.
* A product mindset for owning and building features from the ground up, understanding the “why,” applying holistic thinking, and delivering impact through experimentation.
Benefits
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.
Equal Opportunity Employer
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.
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