Senior Software Engineer - Security Libraries

The shape of it

In the posting’s own words

We're looking for a senior, polyglot engineer to contribute across several of our security libraries, with .NET or Java expertise. You'll design and build security integrations and detection features, take them from prototype to production-hardened, and own them operationally as they instrument thousands of applications.

What it asks for · 6

• You have experience building and shipping libraries or SDKs consumed by other developers, and you understand packaging, versioning, and backward compatibility.
• You have a 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.
• A track record of shipping across several of our languages (Go, Node.js, Python, Ruby, PHP, C/C++).
• Experience with auto-instrumentation, APM/distributed tracing, or code telemetry and introspection .
• Experience with AI-assisted developer tooling or agentic workflows .

Also a plus

• 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.
• A track record of shipping across several of our languages (Go, Node.js, Python, Ruby, PHP, C/C++).
• An 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 .
• A 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 .
• A developer-experience or customer-support sensibility.

What the job covers

• Design, build, and own security integrations and detections (WAF, RASP/exploit prevention, API Security, IAST, SCA) across multiple libraries, with .NET and/or Java as your primary focus .
• Take projects from prototype to deployed, correct, operable, and maintainable, writing code that safely instruments thousands of applications in production.
• Own your systems operationally: monitor production telemetry (e.g., WAF/RASP timeouts, performance and cost), debug challenging cross-system issues, and drive down customer-facing problems.
• Shape the roadmap: help define the OKRs for the systems you own, break features into components other engineers can build in parallel, and drive designs and RFCs to alignment across our security library teams.
• Partner with product management, backend, and frontend teams to turn product ideas, new detections, agentic onboarding, API security, into capabilities customers actually adopt.
• Mentor teammates and act as a force multiplier: raise the bar on code quality and testing, and make the whole team more effective than you'd be on your own.
• Represent Datadog in the relevant language and security communities.

Degree language

• You have a BS/MS/PhD in a STEM field or equivalent experience.

Tools and skills named

Words the posting leans on

• security17×
• code10×
• libraries8×
• product7×
• applications6×
• build6×
• experience6×
• detections5×
• production5×
• customer4×
• integrations4×
• language4×
• net java4×
• api security3×
• design3×
• drive3×

Counted from the posting after the mission statement and the legal notices are set aside. The ones near the top are the ones a screener is looking for.

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