Sr. Software Engineer, Backend/Cloud (Hybrid, London)

As a global leader in cybersecurity, CrowdStrike protects the people, processes and technologies that drive modern organizations. Since 2011, our mission hasn’t changed — we’re here to stop breaches, and we’ve redefined modern security with the world’s most advanced AI-native platform. We work on large scale distributed systems, processing almost 3 trillion events per day and this traffic is growing daily. Our customers span all industries, and they count on CrowdStrike to keep their businesses running, their communities safe and their lives moving forward. We're proud to work for a mission-driven company leveraging AI to transform the way we work. CrowdStrikers drive their careers through flexibility and autonomy while also being expected to contribute to a culture of responsible AI adoption, experimentation, and innovation. We use an AI-first mindset as a force multiplier to proactively and continuously accelerate execution, build expertise, uncover insights, and solve complex problems. We’re always looking to add talented CrowdStrikers to the team who have limitless passion, a relentless focus on innovation and a fanatical commitment to our customers, our community and each other. Ready to join a mission that matters? The future of cybersecurity starts with you. About the Role: Does building systems that help security analysts close a critical incident before it becomes a breach excite you? Does correlating and analyzing data at trillions-of-events-per-day scale sound like the kind of challenge you want to wake up to? Do you care deeply about cybersecurity and want to play an active role in helping organizations defend themselves from sophisticated cyberattacks? We'd love to meet you. We are seeking a Senior Software Engineer, Cloud to join our Threat Detection and Incident Response (TDIR) team, helping revolutionize security management with our AI-native Falcon Next-Gen SIEM platform – enabling customers to detect, investigate, and hunt down threats 150x faster at Petabyte scale. You'll design, architect, and develop world-class case management and investigation capabilities in Go, empowering security analysts to be more effective at incident response, threat hunting, and collaborative investigations. You'll build intelligent workflows that connect detections, evidence, and response actions into cohesive cases. Leveraging advanced correlation, contextual enrichment, and AI/ML-powered insights, you'll help security teams work smarter through intelligent threat prioritization, automated investigation suggestions, and agentic analyst workflows – helping them respond faster to emerging threats. While Go experience is preferred, strong backend engineers from other languages who can demonstrate rapid adaptability and a track record of delivering at scale are welcome to apply. If this is the kind of scale and impact you're looking for, we'd love to hear from you. What You’ll do: • Own the engineering bar. Drive architectural improvements, set the standard for code quality, and ensure our systems are performant, reliable, and built to last – not just for today's scale, but for what's next • Lead system design and architecture decisions, including design reviews and RFC processes • Develop Go-based microservices supporting threat detection, case management, and incident response workflows, alongside RESTful APIs that power customer-facing capabilities • Take end-to-end ownership of technical initiatives, both individually and as part of a team, across projects of increasing scope and complexity • Work closely with designers, product managers, and engineers across product groups to understand, design, and implement solutions • Mentor junior and mid-level engineers through pair programming, code reviews, and one-on-one knowledge sharing • Contribute to AI-powered capabilities including LLM integration, agentic workflows, and intelligent analyst tooling • Participate in the on-call rotation and drive improvements that reduce your teams toil and increase system reliability • Operate with a high degree of autonomy – you'll be trusted to make decisions and drive outcomes What You’ll Need:  • A collaborative team player who lifts those around them (We believe in: One team. One fight!) • 8 + years of professional software engineering experience, with 5+ years building and operating distributed systems or cloud-native services at scale in production • Solid understanding of distributed systems, scalability, RESTful patterns, and multithreading concepts • Proficiency building and scaling resilient, low-latency services in production using Go, Python, Java, C++, or C# • Hands-on experience with Docker, Kubernetes, and cloud platforms, preferably AWS or GCP • Strong communicator and collaborator across functions and levels, with a bias for ownership and a customer-first mindset • Proven ability to translate complex and ambiguous business requirements into technical solutions and deliver projects on schedule • Proven experience utilizing AI technologies to enhance decision-making, streamline workflows and processes, improve efficiency and drive business outcomes. Bonus points: • Currently developing Go-based microservices for scalable, high-throughput architectures • Experience in cybersecurity, SIEM, SOAR, or adjacent security domains • Hands-on experience with LLM integration, prompt engineering, RAG pipelines, or agentic AI frameworks #LI-GO1 #LI-HYBRID Benefits of Working at CrowdStrike: • Market leader in compensation and equity awards • Comprehensive physical and mental wellness programs • Competitive vacation and holidays for recharge • Paid parental and adoption leaves • Professional development opportunities for all employees regardless of level or role • Employee Networks, geographic neighborhood groups, and volunteer opportunities to build connections • Vibrant office culture with world class amenities • Great Place to Work Certified™ across the globe CrowdStrike is proud to be an equal opportunity employer. We are committed to fostering a culture of belonging where everyone is valued for who they are and empowered to succeed. We support veterans and individuals with disabilities through our affirmative action program. CrowdStrike is committed to providing equal employment opportunity for all employees and applicants for employment. The Company does not discriminate in employment opportunities or practices on the basis of race, color, creed, ethnicity, religion, sex (including pregnancy or pregnancy-related medical conditions), sexual orientation, gender identity, marital or family status, veteran status, age, national origin, ancestry, physical disability (including HIV and AIDS), mental disability, medical condition, genetic information, membership or activity in a local human rights commission, status with regard to public assistance, or any other characteristic protected by law. We base all employment decisions--including recruitment, selection, training, compensation, benefits, discipline, promotions, transfers, lay-offs, return from lay-off, terminations and social/recreational programs--on valid job requirements. If you need assistance accessing or reviewing the information on this website or need help submitting an application for employment or requesting an accommodation, please contact us at recruiting@crowdstrike.com for further assistance.