Senior Software Quality Engineer

🚀 CUJO AI® is a leader in artificial intelligence solutions for network service providers. We use machine learning and real-world data to develop cybersecurity, device intelligence, network intelligence, and parental control solutions that make internet connections safer for millions of homes. 

About the Role 

We are looking for a Senior Software Quality Engineer to join our E2E Quality team in Lithuania. 

Quality at CUJO AI is not a final checkpoint — it’s embedded into how we build. Our products run on real home networks, protecting real families, which means quality issues have a direct impact on customers. The E2E Quality team works across firmware, cloud backend, and mobile products to ensure that what we ship is solid, safe, and reliable. 

We believe the best quality engineers are defined less by the number of tests they write and more by their judgment about what matters to test. We’re looking for someone who can think like an engineer, reason about risk before it becomes a defect, and influence how the whole team approaches quality — not just their own slice of it. 

The compensation package starts from 4300 EUR to 5800 EUR (gross), depending on your experience. 

In This Role, You Will: 

• Shape quality strategy — define and maintain test approaches that reflect both technical risk and customer impact. Make sure QA activities are transparent, measurable, and sustainable. 
• Build automation that lasts — write Python-based test automation that is clean, maintainable, and actually used by the team. Follow CUJO’s standards and push them forward. 
• Own quality outcomes — take responsibility for release readiness, not just test execution. Communicate risks clearly and back up every quality decision with data. 
• Stay close to the customer — build quality strategies rooted in how real customers use the product. Engage with customers and partners to surface issues early and translate real-world usage into test coverage.  
• Track and communicate risk — keep stakeholders informed on quality status, open defects, and mitigation plans. Be the person who connects what’s happening in testing to what it means for the release. 
• Mentor and share — guide junior QA team members, document what you know, and contribute to a company-wide culture of quality. 

What We’re Looking For: 

Technical Knowledge 

You should be able to reason about and work effectively with: 

• Python — writing clean, production-quality test automation code. 
• Networking fundamentals: TCP/IP, DNS, DHCP, HTTP/HTTPS, VPN. 
• Test frameworks such as pytest and modern automation tooling. 
• Test case design, defect management, and E2E & UAT testing. 
• CI/CD pipelines and integrating tests into automated build flows. 
• Agile development environments and iterative testing practices. 

Engineering Judgment 

We weight these capabilities heavily: 

• Quality sense — you can read a feature spec and know what could break for a real customer. You have opinions about coverage and can back them up. 
• Strategic thinking — you balance short-term delivery with long-term quality goals. You know when to go deep and when to move on. 
• Analytical & problem-solving — you treat bugs as signals, not annoyances. You trace root causes systematically and propose solutions, not just reports. 
• Collaboration & influence — you build quality standards with teams, not around them. You can drive improvements without formal authority. 
• Ownership & accountability — you follow through. From risk identification to resolution, you don’t consider your job done until the problem is. 
• Communication — strong verbal and written English; you can explain a quality risk clearly to an engineer, a product manager, or a senior leader. 

What Will Make You Stand Out: 

• 5+ years in software QA, ideally across more than one product domain. 
• Experience testing networking products, cybersecurity systems, or embedded firmware. 
• Familiarity with traffic capture and analysis tools (Wireshark, tcpdump, Linux). 
• A track record of improving QA processes, not just following them. 
• Experience mentoring junior engineers or building team-wide testing practices. 
• Strong verbal and written communication skills in English for effective communication with our international team. 

Why Join CUJO AI? 

• Flexible Work – Hybrid work model with flexible hours, centered around our Kaunas office. 
• Team Gatherings – Annual company events and team activities. 
• Career Growth – Training bonuses and other learning opportunities. 
• Performance Bonuses – Company-wide annual bonus program. 
• Referral Rewards – Earn up to €1,000 for referring new hires. 

At CUJO AI, we value innovation, collaboration, and continuous improvement. Join us and work on technology that makes the internet safer! 

📅 Apply by May 3, 2026 – but don’t wait! We’ll hire as soon as we find the right person. 

📩 Apply via our recruitment portal. Questions? Email us at [email protected].