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HOME Software Engineering & Dev Senior Backend Engineer
  • Source.Ai
  • Vilnius Kaunas, KU
  • Full-Time
  • 22 days ago
  • €6,000–€7,200 / month
Source.Ai VERIFIED EMPLOYER

Senior Backend Engineer.

Remote Software Engineering & Dev Full-Time
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Senior Backend Engineer: our view in 3 lines...

  • The Role:This role is for a backend engineer who builds and scales high-performance APIs for large-scale web proxy infrastructure.
  • The Person:The person will build and maintain high-performance backend APIs, own the design and delivery of services handling billions of requests daily, and investigate and resolve production issues across distributed systems.
  • Requirements:The ideal candidate has strong experience in at least one OOP language, proven experience designing and scaling APIs, and familiarity with distributed systems and async architectures.

About the role

Webshare 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.
Webshare 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.

In this role, you’ll:

  • Build and maintain high-performance backend APIs that power Webshare’s proxy infrastructure.
  • Own the design and delivery of services that handle billions of requests daily.
  • Collaborate in a highly autonomous team to scope, plan, and execute work with minimal meetings.
  • Investigate and resolve production issues across distributed systems.
  • Balance speed and quality, by identifying which trade-off is better for a particular situation.
  • Operate and improve our containerized infrastructure.
  • Continuously improve system performance, observability, and cost-efficiency.

    • Your skills & experience:

     
  • Strong experience in at least one OOP language.
  • Ability to work with industry standard AI tools (LLMs), while balancing code quality and speed, but never compromising on reliability and architecture.
  • Ability 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.
  • Comfortable working in an infrastructure heavy environment.
  • Proven experience designing and scaling APIs.
  • Familiarity with distributed systems and async architectures.
  • Willingness to understand deep networking concepts (BGP, CIDR, ASNs).
  • Fluent English (international team).
  • Can handle working with a remote team (we’re worldwide).

    • Nice to have:

  • Experience with Python.
  • Experience with very large datasets.
  • Experience with proxies or other networking-related technologies.
  • Experience with golang.

    • Salary & Benefits:

  • Gross salary:  6 000 - 7 200 EUR/month gross + quarterly KPI-based performance bonus. Keep in mind that we are open to discussing a different salary based on your skills and experience.
  • Growth & Learning: 40+ internal learning options, external conferences, mentorship, and year-round knowledge-sharing.
  • Health & Well-being: Private health insurance, gym allowance and a wellness app.
  • Celebration & Community: Team events, an overseas workation and plenty of ways to mark milestones together.
    •  
    Plus bonus vacation days, paid life-moment days off, barista coffee, and all the tools you need. See the full list of benefits here: https://source.ai/career/blog/benefitsrk-benefits/.
    Webshare is part of Source, a data ecosystem for a world built on intelligence. One of a growing network of independent technology companies connected by shared standards, expertise, and a belief in responsible access to web data.
     
    Up for the challenge? Let’s talk!
    Published October 19, 2026
    Location Vilnius Kaunas, Lithuania
    Category Software Engineering & Dev  
    Job Type Full-Time  

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