{"id":3319393,"url":"https://alion.io/job/tesonet-senior-vpn-software-engineer-2","title":"Senior VPN Software Engineer","company":{"id":56358,"name":"Tesonet","domain":"tesonet.com","url":"https://alion.io/company/tesonet","size_band":"201-500","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Vilnius, Lithuania","Kaunas, Lithuania"],"countries":["LT"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":4750,"max":7000,"currency":"EUR","period":"month","gross":true,"usd_annual":93936},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ansible","optional":false},{"name":"CI/CD","optional":false},{"name":"Debian","optional":false},{"name":"eBPF","optional":false},{"name":"HAProxy","optional":false},{"name":"Linux","optional":false},{"name":"VPN","optional":false}],"status":"live","first_seen_at":"2026-10-22T01:41:20Z","employer_posted_date":null,"last_verified_at":"2026-10-22T01:41:20Z","board_verified":false,"closed_at":null,"days_open":13,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":13},"description":"Job Description\nJoin Surfshark's VPN Engineering team to build and scale the core software powering our global infrastructure. You will own key stack components, optimize high-performance tools like WireGuard and HAProxy, and work with SRE to maintain a fast, secure fleet of thousands of servers. This role offers deep technical ownership, from kernel tuning and eBPF programming to architecting low-latency protocol extensions.\n\nDesign and scale our proprietary VPN software (SDN, Dausos, WCB) and extend tools like WireGuard and HAProxy;\n\nDig into the Linux networking stack, debug it, and tune it for high-scale traffic while maintaining custom Debian images;\n\nWrite eBPF programs for packet processing and architect systems for ultra-low latency and high throughput;\n\nLead R&D on custom protocol extensions and optimizations, drive large-scale refactoring, and set the coding standards others follow;\n\nWork with SRE team to automate a global fleet through Ansible deployments and custom CI/CD pipelines.\n\nRequirements\n\nProven experience tracing complex production issues across code, OS, and service boundaries;\n\nProven experience architecting solutions that hold up across thousands of servers;\n\nProgramming skills in Go and/or C;\n\nHands-on work with Ansible and a solid grasp of scalable deployment architectures.\n\nCompany offers\n\nGrowth and learning opportunities: time dedicated to learning, conferences, online learning platforms, and books for your professional development;\n\nHealth and wellness: we want you to feel and be your best. That's why we offer various benefits, from online workouts, a physical coach and a gym to regular mental health checks;\n\nTools of your choice: choose technical equipment and the tools you need to do your best;\n\nCommunity and celebrations:get ready for long-lasting traditions such as yearly workation, Friday get-togethers, various team buildings and company celebrations;\n\nConvenient commuting: traveling from point A to point B can be a pain. That’s why, depending on your unique circumstances, we compensate part of your public transport costs;\n\nWork-life balance: We encourage working in the office, with the possibility of up to two remote days per week. 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