Senior Software Engineer

About the Company

Datadog is the leading observability and security platform for the AI era, providing businesses with unified visibility across the technology stack to manage complexity at scale. It brings applications, infrastructure, data, models, and security into one place, using AI to detect and resolve issues before they impact customers.

Responsibilities

• Design, build, and own security integrations and detections (WAF, RASP, API Security, IAST, SCA) across multiple libraries
• Take projects from prototype to deployed, correct, and maintainable production code
• Own systems operationally by monitoring production telemetry and debugging cross-system issues
• Shape the roadmap by defining OKRs and driving designs and RFCs to alignment
• Partner with product management, backend, and frontend teams to turn product ideas into capabilities
• Mentor teammates and raise the bar on code quality and testing

Requirements

• Expert proficiency in at least one of .NET (C#) or Java
• Experience building and shipping libraries or SDKs consumed by other developers
• Strong software-engineering fundamentals and modular code design
• Product-engineering mindset with a focus on user experience and outcomes
• Experience measuring and optimizing for performance and cost
• Operational maturity and accountability for production code
• Clear written and verbal communication skills
• BS/MS/PhD in a STEM field or equivalent experience

Preferred Qualifications

• Deep expertise in language runtime internals (JVM, bytecode instrumentation, CLR, JIT, or GC)
• Track record of shipping in Go, Node.js, Python, Ruby, PHP, or C/C++
• Background in application security (WAF, RASP, SAST/IAST/SCA, or threat detection)
• Experience with auto-instrumentation, APM, or distributed tracing
• History of maintaining open-source projects (e.g., NuGet, Maven)
• Experience with AI-assisted developer tooling or agentic workflows