Salary
$67k – $94k per year (gross)
Location
In office (Vilnius, Kaunas)
Seniority
Senior
Employment
Full-Time
First seen by Alion on Oct 13, 2026.
Overview
Company
Impact
Profile match
Tesonet is a Lithuanian technology accelerator and holding founded in 2008 and headquartered in Vilnius. It builds and scales software businesses in cybersecurity, data and consumer products. Several of the largest Lithuanian technology companies grew out of it.
Job Description
We’re building HeyPolo - a privacy-first smart location-sharing app that helps families and friends stay connected, and safe. HeyPolo is designed for meaningful connection without intrusive tracking: real-time updates, consent-based sharing, and intuitive safety features that put users in charge of their data and peace of mind.
If you’re excited by real user impact, privacy-centered innovation, and building something from scratch with a small, autonomous team, read ahead.
- Architect, build, and own the server-side logic of the new application;
- Lead the design and implementation of backend features and APIs using .NET/C#;
- Focus on writing clear, tested, documented code that delivers real business value;
- Ensure responsive and reliable service through scalable architecture.
Requirements
- Proven experience as a Senior Backend Developer, specifically with .NET/C#
- Strong understanding of OOP, design patterns, and modern .NET frameworks
- Experience with RESTful API design and implementation
- Experience in building highly scalable systems
- Proficiency with database design and management
- Background in microservices architecture
- Familiarity with DevOps practices
- Excellent problem-solving skills and attention to detail
- Strong communication skills and a team-oriented mindset
Company offers
- Growth and learning opportunities: time dedicated to learning, conferences, online learning platforms, and books for your professional development
- Health and wellness: we want you to feel and be your best. That's why we offer various benefits, from online workouts and a physical coach to health insurance and regular mental health checks
- Tools of your choice: choose the technical equipment and tools you need to do your best work
- Community and celebrations: get ready for long-lasting traditions such as yearly workation, Friday get-togethers, various team buildings and company celebrations
- Work-life balance: We encourage working in the office, with the possibility of up to two remote days per week. Plus, with our WFA policy, you can work from almost anywhere in the world
- More days off: additional vacation days depending on your tenure
- Premium Surfshark accounts: for you, your family, and friends
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