{"id":3319386,"url":"https://alion.io/job/tesonet-senior-backend-engineer-2","title":"Senior Backend 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":"hybrid","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":6000,"max":7200,"currency":"EUR","period":"month","gross":true,"usd_annual":96624},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"BGP","optional":false},{"name":"Python","optional":false}],"status":"live","first_seen_at":"2026-10-27T02:41:03Z","employer_posted_date":null,"last_verified_at":"2026-10-27T02:41:03Z","board_verified":false,"closed_at":null,"days_open":2,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":2},"description":"Job Description\nWebshare is an affordable and powerful self-serve proxy infrastructure. Built for prosumers, solopreneurs, and growing businesses, it delivers enterprise-grade capabilities without the premium price tag or the sales calls. That same principle shapes the team: lean, flat, and async by default, where clarity and follow-through matter more than hierarchy.\n\nWebshare is an enterprise-grade proxy platform delivering fast, self-service access to over 80 million global IPs across 195 countries. Built for extreme reliability with 99.97% network uptime, it enables tens of thousands of businesses worldwide to run large-scale web scraping, market research, and automated data collection through dev-friendly APIs.\n\nIn this role, you’ll:\n\nBuild and maintain high-performance backend APIs that power Webshare’s proxy infrastructure.\n\nOwn the design and delivery of services that handle billions of requests daily.\n\nCollaborate in a highly autonomous team to scope, plan, and execute work with minimal meetings.\n\nInvestigate and resolve production issues across distributed systems.\n\nBalance speed and quality, by identifying which trade-off is better for a particular situation.\n\nOperate and improve our containerized infrastructure.\n\nContinuously improve system performance, observability, and cost-efficiency.\n\nRequirements\n\nStrong experience in at least one OOP language.\n\nAbility to work with industry standard AI tools (LLMs), while balancing code quality and speed, but never compromising on reliability and architecture.\n\nAbility to work in a programming language agnostic environment,you're eager to learn and excited to grow your backend engineering skills, including working with Python.\n\nComfortable working in an infrastructure heavy environment.\n\nProven experience designing and scaling APIs.\n\nFamiliarity with distributed systems and async architectures.\n\nWillingness to understand deep networking concepts (BGP, CIDR, ASNs).\n\nFluent English (international team).\n\nCan handle working with a remote team (we’re worldwide).\n\nNice to have\n\nExperience with Python.\n\nExperience with very large datasets.\n\nExperience with proxies or other networking-related technologies.\n\nExperience with golang.\n\nCompany offers\n\n40+ internal learning options, external conferences, mentorship, and year-round knowledge-sharing.\n\nPrivate health insurance, gym allowance and a wellness app.\n\nTeam events, an overseas workation and plenty of ways to mark 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