Java Software Engineer

1oT is expanding its team and looking for an engineer to join us in building connectivity solutions according to the new eSIM IoT standard.

1oT has built a platform for helping global IoT service providers manage their SIM cards and billing. The self-service based platform enables users to control and monitor SIM card sessions, switch SIM cards on/off, buy new SIMs, send SMS to the SIM, etc. Our client portfolio ranges from e-mobility to asset tracking to smart city solutions, so you will have interaction with a variety of IoT sectors and telecom companies. 

eSIM team owns services that implement the eSIM standard of GSMA.

Number of vacancies

1

Deadline for applying

31.12.2025

Job location

Tallinn

Work assignments

What you'll do:


  • Develop large-scale services ( Java / REST / Spring / SQL )
  • Contribute to back-office UI ( Vue.js )
  • Run and maintain AWS services ( Terraform / Docker / Grafana )
  • Participate in discussions on the architecture of the platform
  • Build eSIM infrastructure according to GSMA specs
  • Handle external integrations via APIs

Education

A degree in Computer Science or a related field is beneficial but not required. Practical experience matters more.

Work experience

What you'll bring:


  • 3+ years of development experience (Java / REST / Spring / SQL)
  • Experience with cloud platforms (AWS / Azure / GCP)
  • Familiarity with modern UI frameworks is a plus
  • Experience with cryptography or HSM is a strong plus
  • Background in working with APIs

Personal qualities

Youre a good fit if you..


  • enjoy solving problems and turning ideas into clean, working solutions
  • take ownership of your tasks deadlines, goals, responsibilities
  • like collaborating, sharing ideas, and joining technical discussions
  • prefer action over bureaucracy and dont get stuck in corporate slow-motion
  • are curious, eager to learn, and excited about building things that dont yet exist
  • bring a positive, high-accountability approach to teamwork

Language skills

English

Additional requirements

Ability to work with APIs and integrations

Comfortable with security-focused development approaches

Willingness to collaborate closely with the eSIM team

Company/organization offers

What we offer:


Meaningful, globally impactful work on cutting-edge eSIM technology

Diverse development tasks: new features, optimizations, refactoring

Opportunity to grow, influence, and shape products in a scaling company

Cozy, productive environment in our Tallinn HQ

Ambitious teammates who challenge the status quo daily

Supportive and fun team atmosphere

Information TechnologyTechnical Engineering
  • Benefits/salary details:

    Competitive salary package tailored to experience

  • Work time: Full time work
  • Workload: 1
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