Senior Software Engineer - Security Libraries

Datadog

Posted 1mo ago

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Design, build, and own security integrations and detections
Take projects from prototype to production-hardened
Own systems operationally: monitor production telemetry, debug issues, drive down problems
Shape the roadmap: define OKRs, break features into components, drive designs and RFCs
Partner with product management, backend, and frontend teams
Mentor teammates and raise the bar on code quality and testing
Represent Datadog in relevant language and security communities

Expert in at least one of .NET (C#) or Java
Polyglot who can contribute idiomatically across other libraries
Write clean, correct, well-tested, performant, idiomatic code
Strong software-engineering fundamentals: ship modular, maintainable code with little guidance
Product-engineering mindset: care about user experience and product outcomes
Weigh technical trade-offs against customer impact
Experience building and shipping libraries or SDKs consumed by other developers
Understand packaging, versioning, and backward compatibility
Care about performance and cost (time and space)
Experience measuring and optimizing for performance and cost
Operationally mature: take full accountability for what you ship in production
Communicate clearly in writing and in person
Drive alignment through RFCs and informal collaboration
Give bad news early and constructive, empathetic feedback
BS/MS/PhD in a STEM field or equivalent experience

Deep expertise across .NET or Java, including familiarity with language runtime internals and instrumentation, the JVM, bytecode instrumentation and Java agents; or the CLR/JIT/GC, IL rewriting, and DiagnosticSource/EventPipe in .NET
Track record of shipping across several of our languages (Go, Node.js, Python, Ruby, PHP, C/C++)
Application security background: WAF, RASP, SAST/IAST/SCA, threat detection, or secure-by-design practices
Experience with auto-instrumentation, APM/distributed tracing, or code telemetry and introspection
History of maintaining open-source projects, with public projects or published packages (e.g., NuGet, Maven)
Experience with AI-assisted developer tooling or agentic workflows
Developer-experience or customer-support sensibility

Skills