Performance Engineer, Low-Level Libraries

Are you committed to squeezing every drop of performance? Join Meta's Low-Level Libraries team and drive impact across our foundational infrastructure.We own the performance and Developer Experience (DevX) for critical C/C++ libraries like folly, Jemalloc, and GEMM (MLK, Aocl-Blas, etc.). Our work involves cutting-edge optimizations in domains such as memory management, concurrency, architecture-specific enablement, and AI frameworks. The result? Significant power savings and enabling new platforms at Meta.

Performance Engineer, Low-Level Libraries Responsibilities:

• Develop and optimize C/C++ libraries for Meta services-memory allocation, thread pools and work scheduling, thread synchronization and lockless data structures, highly performant collections, async processing and I/O, RPC, etc
• Analyze resource utilization in server applications (CPU, GPU, memory, network, etc.), identify bottlenecks, scope out opportunities for improved resource utilization, and implement improvements, such as modifying core libraries to optimize Meta server workloads, implementing efficiency improvements in production code (e.g., change core data structures), or improving server utilization
• Work with internal customers and partners to define requirements
• Reflect requirements in the team roadmap and plan out execution

Minimum Qualifications:

• Bachelor's degree in Computer Science, Computer Engineering, relevant technical field, or equivalent practical experience
• 7+ years of professional C/C++ experience
• Knowledge of computer architecture, CPU and memory subsystem, and OS-level resource management
• Experience using performance-profiling tools and optimizing native applications for execution-time and memory efficiency

Preferred Qualifications:

• Experience implementing and optimizing low-level libraries, such as memory management, threading, GEMM, data compression, or string processing
• Knowledge of modern ISAs, such as x86 and ARM
• Experience hand-tuning code, e.g., with loop optimizations, vectorization, parallelization, HW-architecture-specific optimizations
• Experience developing operating-system kernels

About Meta:

Meta builds technologies that help people connect, find communities, and grow businesses. When Facebook launched in 2004, it changed the way people connect. Apps like Messenger, Instagram and WhatsApp further empowered billions around the world. Now, Meta is moving beyond 2D screens toward immersive experiences like augmented and virtual reality to help build the next evolution in social technology. People who choose to build their careers by building with us at Meta help shape a future that will take us beyond what digital connection makes possible today-beyond the constraints of screens, the limits of distance, and even the rules of physics.

Meta is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender, gender identity, gender expression, transgender status, sexual stereotypes, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Meta participates in the E-Verify program in certain locations, as required by law. Please note that Meta may leverage artificial intelligence and machine learning technologies in connection with applications for employment.

Meta is committed to providing reasonable accommodations for candidates with disabilities in our recruiting process. If you need any assistance or accommodations due to a disability, please let us know at accommodations-ext@fb.com.

$85.10/hour to $251,000/year + bonus + equity + benefits

Individual compensation is determined by skills, qualifications, experience, and location. Compensation details listed in this posting reflect the base hourly rate, monthly rate, or annual salary only, and do not include bonus, equity or sales incentives, if applicable. In addition to base compensation, Meta offers benefits. Learn more about benefits at Meta.

Client-provided location(s): Bellevue, WA

Job ID: a1KDp00000CZKChMAP

Employment Type: OTHER

Posted: 2025-12-19T19:54:23