Software Development Engineer (L5), Perimeter Protection (Anti-DDoS), NFW

Key job responsibilities

• Design, develop, and maintain scalable distributed systems that power AWS Network Firewall, ensuring high availability and performance at global scale
• Implement deep packet inspection and traffic analysis features to detect and mitigate evolving network threats and attacks
• Collaborate with cross-functional teams to gather customer requirements and translate them into technical designs and working software
• Own the full software development lifecycle from design through deployment and operational support, including on-call responsibilities
• Contribute to system architecture decisions and drive technical direction for new feature development
• Write clean, maintainable, and well-tested code while participating in code reviews to maintain high engineering standards
• Develop automation and tooling to improve operational efficiency, deployment velocity, and system reliability
• Analyze and resolve complex production issues, performing root cause analysis and implementing preventive measures
• Mentor junior engineers and contribute to a culture of technical excellence and continuous improvement

A day in the life

As an SDE on the Network Firewall team, you'll start your day reviewing operational metrics and customer feedback to prioritize your work. You'll spend time writing and reviewing code, collaborating with teammates on design discussions, and working directly with customers to understand their security challenges. You'll participate in sprint planning, contribute to architecture reviews, and deploy code to production — often in the same day. Your internal stakeholders include product managers, security researchers, and partner teams across AWS Perimeter Protection. The problems you solve directly protect some of the world's largest organizations from sophisticated network attacks.

About the team

The Perimeter Protection team is responsible for building and operating AWS's suite of network security services — including AWS Shield, AWS WAF, AWS Firewall Manager, and Network Firewall. Our mission is to make it simple for customers to protect their applications and networks from threats at any scale. We operate with a startup mentality inside AWS: we move fast, ship frequently, and empower engineers to own their solutions end-to-end. Our culture values curiosity, customer obsession, and technical depth, and we celebrate bold ideas that push the boundaries of what's possible in cloud security.