{"id":3213044,"url":"https://alion.io/job/tesonet-windows-engineer-mid-senior-c-net","title":"Windows Engineer · Mid-Senior · C#/.NET","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":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Vilnius, Lithuania","Kaunas, Lithuania"],"countries":["LT"],"hiring_countries":["LT"],"hiring_countries_total":1,"salary":{"min":3200,"max":7000,"currency":"EUR","period":"month","gross":true,"usd_annual":94116},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":".NET","optional":false},{"name":"Agile","optional":false},{"name":"C#","optional":false},{"name":"Git","optional":false},{"name":"Windows","optional":false},{"name":"TCP/IP","optional":true},{"name":"VPN","optional":true}],"status":"live","first_seen_at":"2026-10-09T01:34:43Z","employer_posted_date":null,"last_verified_at":"2026-10-09T01:34:43Z","board_verified":false,"closed_at":null,"days_open":21,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":21},"description":"Job Description\nAt Nord Security’s B2B team, we build cybersecurity products that enable businesses to protect themselves and their data.\n\nFrom product and engineering to sales, marketing, and data — our teams work closely together to deliver secure, scalable solutions trusted by companies around the world.\n\nYour impact? Empowering businesses everywhere to keep their people, systems, and data safe.\n\nMain Responsibilities\n\nDesign, develop, and maintain Windows applications and system components - Services, IPC, networking, GUI, APIs, and drivers.\n\nCollaborate with designers, QA, and the Product Owner to extend and improve the functionality of our product, from early technical discussions to final delivery.\n\nTake ownership of features end-to-end: research solutions, write clean and maintainable code, and see your work through to release.\n\nContribute to architectural decisions and help shape the technical direction.\n\nRequirements\n\nProven Experience: minimum 3+ years of experience in Windows application development using .NET.\n\nWindows API Proficiency: deep familiarity with Windows API, including experience with multithreading, inter-process communication, and memory management.\n\nDebugging & Troubleshooting: excellent debugging and troubleshooting skills with experience using Windows debugging tools.\n\nExperience in Agile & Git.\n\nProfound English language skills.\n\nNice to have\n\nGood understanding of networking protocols (TCP/IP, UDP), VPN technologies (OpenVPN, WireGuard, IPSec), and network security principles.\n\nGood understanding of security best practices and a commitment to writing secure code.\n\nCompany offers\n\nSharpen your edge Growth is built into how we work. Extensive online and in-person training programs, access to platforms like Coursera and Skillshare, a mentorship program, and internal career moves when you’re ready for something new — your development has no ceiling here.\n\nTake the time you need Rest isn’t a reward — it’s part of the deal. Enjoy extra vacation days that grow with your time here, plus additional days off for sick leave, special occasions, and parenting.\n\nGet premium healthcare Your health shouldn’t be something you worry about. We provide premium private health insurance so you have peace of mind and fast access to care whenever you need it. Available in Lithuania and Poland.\n\nProtect your peace A peaceful mind isn’t a luxury — it’s the foundation. We provide free subscriptions to top-rated Calm and Headspace apps, offer resilience and mindfulness trainings, and run dedicated mental health events.\n\nOwn your fitness Feeling good shapes how you work, think, and create. That’s why we offer in-house gyms, Multisport and Urban Sport cards, and online workouts. Need something tailored? Our Physical Well-Being experts are here with group mobility sessions, fitness guidance, and one-on-one consultations.\n\nPack your bags for workation Picture this: the entire company flies out abroad. The days are packed with workshops, activities, concerts, and real time together. It’s legendary. If you’ve heard stories, they’re probably true.\n\nWork from anywhere New surroundings spark new thinking. When you need a reset, switch location and work from wherever keeps you sharp, creative, and in the zone.\n\nCelebrate your milestones The moments that make life special shouldn’t pass quietly. Birthdays, work anniversaries, weddings, new family members — each is marked with a special gift.\n\nParent with ease When you’re a parent, the juggle is real. To make it smoother, we organize summer camps for the little ones and offer flexibility that lets you show up both for your family and your team.\n\nJoin the party It never gets boring here. Get ready for team buildings that bring people closer, year-round company events that are equal parts educational and energizing, and the highlights everyone waits for — our iconic summer and winter celebrations.\n\nUnlock Cyber City Whether Vilnius-based or visiting from remote, our Vilnius HQ is fully yours to enjoy. Need focus? Silent room. Need energy? Open gyms. Need a break? Game room, music room, coffee bar. It’s a modern workspace built with your comfort in mind.","description_format":"text","description_chars":4169,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Company events","Health insurance"],"hiring_locations":[{"name":"Lithuania","iso":"LT","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Custom Software Development","Angel Networks & Startup Accelerators"],"lifecycle":[{"event":"open","at":"2026-10-24T18:50:56Z"}],"visa":[],"liveness":{"score":57,"band":"ok","label":"Likely open","p_open":0.85,"p_active":0.89,"p_room":0.75,"age_days":21,"expected_fill_days":30,"reasons":["seen:21","velocity","win:late"],"computed_at":"2026-10-30T05:48:23Z"},"pay":{"stated_usd_annual":94116,"is_top_pay":false},"html_url":"https://alion.io/job/tesonet-windows-engineer-mid-senior-c-net","json_url":"https://alion.io/job/tesonet-windows-engineer-mid-senior-c-net.json","meta":{"generated_at":"2026-10-30T23:13:02Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":14398,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-31T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":56358},"rest":"https://alion.io/mcp/rest/get_company?id=56358"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftesonet-windows-engineer-mid-senior-c-net"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Ftesonet-windows-engineer-mid-senior-c-net"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Ftesonet-windows-engineer-mid-senior-c-net"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/tesonet-windows-engineer-mid-senior-c-net\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftesonet-windows-engineer-mid-senior-c-net"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3213044}},{"tool":"search_jobs","arguments":{"company":"tesonet.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3213044},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. Docs: https://alion.io/developers"}}