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1oT is expanding the eSIM team, and we are looking for a Software Engineer to help us build connectivity solutions based on the latest eSIM IoT standard.
1oT has built a platform that helps global IoT service providers manage their SIM cards and billing. Our self-service platform lets users control and monitor SIM card sessions, switch SIMs on and off, purchase new SIMs, send SMS messages, and more. We work with clients across e-mobility, asset tracking, and smart city solutions, so you'll get exposure to a wide range of IoT sectors and telecom companies.
1oT eSIM team builds and maintains services that implement the M2M, Consumer, and IoT eSIM specifications of GSMA.
What you'll do:
- Develop large-scale services using Java, REST, Spring, and SQL
- Contribute to our back-office UI built with Vue.js
- Run and maintain our services in AWS using Terraform, Docker, and Grafana
- Participate in discussions on the platform's architecture
- Ensure that eSIM services are built according to GSMA specifications
- Handle external integrations via APIs
What you'll bring:
- 3+ years of development experience with Java, REST, Spring, and SQL
- Experience with cloud-hosted services (AWS, Azure, or GCP)
- Familiarity with modern UI frameworks is a plus
- Experience with cryptography or HSM is a plus
You're a good fit if you:
- Enjoy working as part of a team
- Approach challenges with a problem-solver mindset and focus on getting things done
- Take strong ownership of your work
- Have the curiosity and drive to build products that don't yet exist
Language skills: English
Additional requirements:
- Ability to work with APIs and integrations
- Comfortable with security-focused development
- Based in Tallinn, Estonia
- Comfortable working 4 days per week in the office
What we offer:
- Meaningful, globally impactful work on cutting-edge eSIM technology
- Diverse tasks—from building new features to optimizing existing systems
- Influence and ownership within a growing, sustainable company
- A cozy and productive work environment at our Tallinn HQ
- Ambitious teammates who challenge the status quo
- A supportive, fun team with great vibes
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