Senior Software Engineer

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 Role Summary This is an opportunity to build and improve cloud-based email security services at scale while working with experienced engineers, architects, and product leaders in a mission-driven cybersecurity organization. At Sophos, our mission is to protect customers from cybersecurity threats. The Messaging Security Group develops Sophos Central Email features and capabilities, and this Senior Software Engineer will work within that engineering team. In this role, you will influence system design and engineering best practices across MSG, collaborate with senior development leaders, architects, and product management, and help execute Sophos’ vision for email and messaging security. As part of an agile team, you may lead projects under the guidance of an architect or senior technical lead. For UI projects, you will mentor team members and collaborate closely with the global Sophos UI team to ensure alignment with company UI principles.

What You Will Do

• Use AI-assisted development tools, where appropriate, to design, develop, test, document, and deploy components of Messaging Security Group services.
• Contribute across the full software stack by designing and implementing product components with strong test coverage and automation, delivering against project timelines, quality expectations, and requirements.
• Participate in project planning and help deliver high-value, high-quality solutions that meet business needs.
• Analyze and understand project requirements
• Participate in product design in alignment with the technical strategy, quality standards, and functional requirements.
• Mentor junior members of the team through pair programming and code reviews
• Contribute to daily stand-ups, kick-offs, collaborative estimation and retrospective meetings
• Participate in security reviews of new developments to ensure that released products comply with Sophos' security requirements and industry best practice, including analyzing product security concerns and presenting security documentation
• Actively contribute to code reviews to improve quality and correctness across the immediate team.
• Define test scenarios and test cases to ensure quality of the team's deliverables
• Other duties and responsibilities as directed

What You Will Bring

• 7+ years of professional software engineering experience shipping production services
• Experience using AI-assisted development tools, such as Claude and Codex.
• 5+ years of experience in software development using Java, JavaScript, Angular, GoLang, and possibly React.
• 5+ years of experience using AWS services (S3, EC2, SQS, SNS, CloudWatch, Lambda, ECS, EKS)
• Ability to navigate ambiguous, complex problems (requirements are unclear, multiple competing constrains like performance, security, cost etc.)
• Confidence in designing, implementing and testing software systems and components
• Confidence in presenting your design in front of our Tech Council
• Ability to read code and review PRs
• Experience working with best-of-breed cloud technologies and troubleshooting large-scale cloud-based applications.