Library Software Engineer - C++

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Requirements:

• Develop and maintain high-performance C++ libraries that integrate with reverse proxies to enable observability and diagnostics
• Design and implement runtime instrumentation for latency-sensitive and multi-threaded systems
• Contribute to our adoption and integration of OpenTelemetry standards across Datadog’s C++ observability libraries
• Own the performance, safety, and correctness of systems-level code running in production
• Collaborate with open-source maintainers and engineering teams to improve tooling and ecosystem support
• Investigate deep infrastructure bugs across boundaries (C++, proxies, OS, network stack)
• Contribute to shaping our telemetry standards and cross-platform instrumentation strategies

What You'll Be Doing:

• You’ve written performant, production-grade C++ (C++14 or later) in complex systems
• You’re confident with multithreading, memory management, and debugging low-level concurrency bugs
• You’re comfortable owning critical paths in systems that need to be fast, observable, and safe under load
• You communicate clearly and thrive in remote, distributed, or async-first teams

Nice to Haves:

• You’ve worked on or contributed to open-source reverse proxy projects
• You’ve built or maintained developer-facing libraries or SDKs
• You have experience working on infrastructure components such as proxies, load balancers, or gateway layers
• You’re familiar with system-level observability tools (perf, eBPF, systemtap, etc.)
• You’ve debugged performance bottlenecks in HTTP, TLS, or TCP/IP stacks
• You have exposure to distributed systems and service meshes at scale

Perks and Benefits:

• New hire stock equity (RSUs) and employee stock purchase plan (ESPP)
• Continuous professional development, product training, and career pathing
• Intradepartmental mentor and buddy program for in-house networking
• An inclusive company culture, ability to join our Community Guilds (Datadog employee resource groups)
• Access to Inclusion Talks, our Internal panel discussions
• Free, global mental health benefits for employees and dependents age 6+
• Competitive global benefits

About Datadog:

Datadog (NASDAQ: DDOG) is a global SaaS business, delivering a rare combination of growth and profitability. We are on a mission to break down silos and solve complexity in the cloud age by enabling digital transformation, cloud migration, and infrastructure monitoring of our customers’ entire technology stacks. Built by engineers, for engineers, Datadog is used by organizations of all sizes across a wide range of industries. Together, we champion professional development, diversity of thought, innovation, and work excellence to empower continuous growth. Join the pack and become part of a collaborative, pragmatic, and thoughtful people-first community where we solve tough problems, take smart risks, and celebrate one another. Learn more about #DatadogLife on Instagram, LinkedIn, and Datadog Learning Center.