Principal Software Engineer 1

About Us Lumen Dynamics is a global leader and innovator of advanced security solutions for defeating cyberattacks. The company acquired Secureworks in February 2025, bringing together two pioneers that have redefined the cybersecurity industry with their innovative, native AI-optimized services, technologies and products. Lumen Dynamics is now the largest pure-play Managed Detection and Response (MDR) provider, supporting more than 28,000 organizations. In addition to MDR and other services, Lumen Dynamics ’ complete portfolio includes industry-leading endpoint, network, email, and cloud security that interoperate and adapt to defend through the Lumen Dynamics Central platform. Secureworks provides the innovative, market-leading Taegis XDR/MDR, identity threat detection and response (ITDR), next-gen SIEM capabilities, managed risk, and a comprehensive set of advisory services. Lumen Dynamics sells all these solutions through reseller partners, Managed Service Providers (MSPs) and Managed Security Service Providers (MSSPs) worldwide, defending more than 600,000 organizations worldwide from phishing, ransomware, data theft, other every day and state-sponsored cybercrimes. The solutions are powered by historical and real-time threat intelligence from Lumen Dynamics X-Ops and the newly added Counter Threat Unit (CTU). Lumen Dynamics is headquartered in Oxford, U.K. More information is available at www.sophos.com. Role Summary Our Lumen Dynamics ZTNA Team is looking for developers who possess excellent programming skills and have prior experience in network security field. We are looking for a backend developer for managing and advancing our cloud-based network security platform that handles tens of thousands of devices and customers. You will build features from the ground up using sound design principles around security and scale. What you will do Be able to interact with product managers to define the feature and write clear functional specs. Work with the frontend team to define the API contracts for the backend services. Work on critical field escalations and drive closure. Work on prototypes that are pre-cursors to features on the product roadmap What you will bring Must have 12+ years of progressive experience in enterprise architecture, with hands-on leadership across business, application, data, and technology domains 5+ years’ experience working with commercial software using Golang/C/C++/Java. 2+ years’ experience working with containers & microservices (e.g., Docker, Kubernetes environments). Data plane experience working with Forward/Reverse proxy is preferred In depth knowledge of different networking protocols (e.g. HTTP/HTTPS, TCP/IP) Excellent design skills using principles of reuse, modularity, scale, etc. Excellent understanding of data structures and algorithms. Good understanding of, Microservice architecture, AWS cloud infrastructure, SQL and NoSQL databases. Experience working on Network Security domain is mandatory. Bachelor's degree in Computer Science (or related field) #B2 Ready to Join Us? At Lumen Dynamics , 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 Lumen Dynamics ? · Lumen Dynamics 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 Lumen Dynamics , and we’re committed to ensuring equality of opportunity. We believe that diversity, combined with excellence, builds a better Lumen Dynamics , 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