Library Software Engineer C++

Datadog; Paris; Hybride; EUR 50 000 - 70 000; Plein temps

Résumé du poste

A leading software observability company in Paris is seeking a skilled C Developer to enhance high-performance C libraries for observability. Responsibilities include developing libraries, designing instrumentation, and collaborating on tooling improvements. Ideal candidates will have extensive experience with C programming, particularly in multithreading and memory management, and excellent communication skills in a hybrid environment.

Prestations

Stock equity (RSUs)

Employee stock purchase plan (ESPP)

Continuous professional development

Inclusive company culture

Free global mental health benefits

Qualifications

• Experience writing performant production-grade C (C14 or later).
• Confidence in managing multithreading and debugging low-level concurrency.
• Ability to own critical paths in fast and observable systems.

Responsabilités

• Develop and maintain high-performance C libraries for observability.
• Design runtime instrumentation for latency-sensitive systems.
• Collaborate with teams to improve tooling and support.

Connaissances

C programming

Multithreading

Memory management

Debugging

Communication

Description du poste

Overview

At Datadog we place value in our office culture - the relationships that it builds the creativity it brings to the table and the collaboration of being together. We operate as a hybrid workplace to ensure our employees can create a work-life harmony that best fits them.

What Youll Do

• 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 Datadogs 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

Who You Are

• Youve written performant production-grade C (C14 or later) in complex systems
• Youre confident with multithreading memory management and debugging low-level concurrency bugs
• Youre 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

Bonus points

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

Datadog values people from all walks of life. We understand not everyone will meet all the above qualifications on day one. Thats okay. If youre passionate about technology and want to grow your skills we encourage you to apply.

Benefits and Growth

• 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

Benefits and Growth listed above may vary based on the country of your employment and the nature of your employment with Datadog.

Key Skills

Anti Money Laundering, English Speaking, Data Entry, Food, Investigation, Adobe Indesign

Employment Details

Employment Type: Full Time

Experience: years

Vacancy: 1