Senior Back-End Engineer
ZeroTier, Inc.
Software Engineering
Utrecht, Netherlands
Posted on Jan 8, 2026
About Us
ZeroTier leads the world in next-generation connectivity and cybersecurity. Our platform provides highly secure, peer-to-peer virtual networks, relied upon by millions of users and businesses — from individual users and startups to mid-scale enterprises and Fortune 500 companies. We’re backed by awesome investors including Battery Ventures, Bonfire Ventures, and Anorak Ventures.
The Role
We're looking for a Senior Back-End Engineer with strong expertise to architect and implement core features of our distributed and cloud based Central Management Portal. In this role you'll design, extend our RESTful APIs in Go while also contributing to our frontend when needed. You will work as part of an execution focused engineering team, taking ownership of feature delivery, contributing to architectural decisions and ensuring security and code best practices across our services. You’ll also be expected to document and communicate clearly with teammates and stakeholders to ensure reliable and well understood solutions to support business objectives.
What You'll Do
- Build, ship and iterate on API endpoints and backend services in Go, turning our product ideas into reliable platform features
- Own the design and evolution of the public and internal APIs, ensuring speed, scalability and long term maintainability
- Collaborate closely with other engineers to power great user experiences in our Central Portal
- Develop and operate backend systems using PostgreSQL, PubSub, and OpenFGA, and other cloud-native services
- Bake in security, testing and quality from day one to keep our public services safe and dependable as we scale
- Improve and maintain our CI/CD pipelines and observability, helping the team catching issues more quickly and move fast with confidence
- Act as a senior technical reference in the team, through code reviews, hands-on mentorship and fostering pragmatic engineering decisions and thoughtful architectural decisions
We encourage candidates from non-traditional backgrounds to apply, regardless of formal education, training, and certification. We value diversity of experience and perspectives on our team, and strive to maintain a culture that allows every team member to do great work, bring their best ideas forward, and align those efforts with company goals and practices.
What We're Looking for
- Senior level experience building and owning distributed systems at scale
- Advanced knowledge of Go service development and backend best practices
- Willingness to work occasionally on modern web technologies and frontend frameworks
- Extensive experience integrating with and extending backend REST APIs
- Experience working in a team with a continuous improvement and learning mindset
- Demonstrated application of security best practices in public facing services
- Ability to write clear technical documentation and communicate effectively with team members
- Experience in a startup or fast-paced environment is a strong plus
Benefits
- Competitive salary
- Hybrid work environment: we work 3 days at our office at Utrecht Central Station and 2 days from home
- Equity compensation package
- Retirement savings plan with employer contribution
- 25-holiday days PTO per year
- Flexible work hours (subject to management approval)
- Career Enhancement Funds
- Employee Referral Bonus
More About ZeroTier
Founded in 2013 by Adam Ierymenko, ZeroTier’s mission is to make peer-to-peer networking with strong encryption so simple, secure, and intuitive that it becomes the default for the internet.
To do this ZeroTier simplifies complex networking across physical boundaries, unifying cloud and edge environments. Our network virtualization platform offers enterprise-grade software-defined networking for every device, service, and applications, whether at the edge or in the cloud. It's powerful enough for large businesses and defense applications, yet easy for individuals to use for tasks like gaming or remote access.
Our team is the best of the best, working diligently to solve the hard technical challenges underlying high-performance decentralized networking. We help our customers run networks free of handcuffs and endless minutiae. Come join us!
PLEASE NOTE: Individuals seeking employment at ZeroTier are considered without regard to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, or sexual orientation. Direct applicants ONLY. Any recruiter/3rd party submissions we receive will be considered a gift. Written CV’s and Cover Letters are encouraged. No calls please.