Software Development Engineer in Test (Network Security)

About Us Sophos is a cybersecurity leader defending 600,000 organizations globally with an AI-driven platform and expert-led services. Sophos meets organizations wherever they are in their security maturity and grows with them to defeat cyberattacks. Its solutions combine machine learning, automation, and real-time threat intelligence with frontline human expertise from Sophos X-Ops to deliver advanced, 24/7 threat monitoring, detection, and response. Sophos offers industry-leading managed detection and response (MDR) alongside a comprehensive portfolio of cybersecurity technologies — including endpoint, network, email, and cloud security, extended detection and response (XDR), identity threat detection and response (ITDR), and next-gen SIEM. Together with expert advisory services, these capabilities help organizations proactively reduce risk and respond faster, with the visibility and scalability needed to stay ahead of evolving threats. Sophos goes to market with a global partner ecosystem, including Managed Service Providers (MSPs), Managed Security Service Providers (MSSPs), resellers and distributors, marketplace integrations, and cyber risk partners, giving organizations the flexibility to choose trusted relationships when securing their business. Sophos is headquartered in Oxford, U.K. More information is available at www.sophos.com.

Role Summary

Design, develop, and maintain test plans, automated test suites, and system testbeds for Sophos Network Security product features. In this role, you will strengthen existing test coverage, partner closely with the feature team, and build automated test scripts that enable faster feedback, improved quality, and quicker product delivery.

The ideal candidate brings strong hands-on testing expertise, growing automation capability, and the ability to think beyond execution by identifying risks early, preventing defects, and continuously improving product quality.

What you will do

• Own end‑to‑end quality for assigned features, components, or services
• Design and execute functional, integration, system, and regression testing
• Perform exploratory testing to uncover edge cases and failure scenarios
• Identify, document, and track defects with clear reproduction steps and impact analysis
• Prioritize effectively, stay focused, and drive tasks through to completion
• Design, develop, and maintain automated test cases for APIs, backend systems, and/or UI
• Actively participate in CI/CD pipelines to support continuous testing
• Work closely with developers, product managers, and other QA engineers
• Participate in requirement and design reviews to ensure testability and risk coverage
• Collaborate with developers to debug issues and validate fixes
• Analyze test results and provide quality insights to support release decisions
• Contribute to improving test coverage, tools, and processes

What you will bring

• 4 to 5 years of experience in software quality engineering or test automation roles
• Strong hands‑on experience in test automation development
• Strong understanding of operating systems, network security concepts, and firewall technologies
• Working knowledge of networking technologies and protocols such as HTTP, TCP/IP, UDP, DHCP, DNS, proxy servers, and load balancers
• Experience with cloud platforms such as AWS, Azure, and GCP
• Experience working in Agile environments and supporting continuous integration practices, including nightly builds and release cycles
• Ability to design tests and write test code independently
• Understanding of multi-platform issues across UNIX, Mac, and Windows environments
• Understanding of virtual platforms such as ESX, Xen, Proxmox, and cloud environments
• Understanding of open-source test automation tools
• Understanding of REST, YANG modelling, and JSON
• Understanding of crun, microservices, containers, Kubernetes, and Kubernetes clusters
• Awareness of tools and technologies such as Git, Jenkins, Selenium, JIRA, and Confluence
• Excellent communication, analytical, and problem-solving skills
• A collaborative team player with a positive attitude and a proactive approach to finding innovative solutions

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Ready to Join Us? At Sophos, we believe in the power of diverse perspectives to fuel innovation. Research shows that candidates sometimes hesitate to apply if they don't check every box in a job description. We challenge that notion. Your unique experiences and skills might be exactly what we need to enhance our team. Don't let a checklist hold you back – we encourage you to apply. What's Great About Sophos? · Sophos operates a remote-first working model, making remote work the primary option for most employees. However, some roles may necessitate a hybrid approach. While we are a remote first organization, applicants must have legal authorization to work in the jurisdiction where the position is posted, without requiring employer sponsorship. · Our people – we innovate and create, all of which are accompanied by a great sense of fun and team spirit · Employee-led diversity and inclusion networks that build community and provide education and advocacy · Annual charity and fundraising initiatives and volunteer days for employees to support local communities · Global employee sustainability initiatives to reduce our environmental footprint · Global fitness and trivia competitions to keep our bodies and minds sharp · Global wellbeing days for employees to relax and recharge · Monthly wellbeing webinars and training to support employee health and wellbeing Our Commitment To You We’re proud of the diverse and inclusive environment we have at Sophos, and we’re committed to ensuring equality of opportunity. We believe that diversity, combined with excellence, builds a better Sophos, so we encourage applicants who can contribute to the diversity of our team. All applicants will be treated in a fair and equal manner and in accordance with the law regardless of gender, sex, gender reassignment, marital status, race, religion or belief, color, age, military veteran status, disability, pregnancy, maternity or sexual orientation. We want to give you every opportunity to show us your best self, so if there are any adjustments we could make to the recruitment and selection process to support you, please let us know. Data Protection If you choose to explore an opportunity, and subsequently share your CV or other personal details with Sophos, these details will be held by Sophos for 12 months in accordance with our Privacy Policy and used by our recruitment team to contact you regarding this or other relevant opportunities at Sophos. If you would like Sophos to delete or update your details at any time, please follow the steps set out in the Privacy Policy describing your individual rights. For more information on Sophos’ data protection practices, please consult our Privacy Policy Cybersecurity as a Service Delivered | Sophos