C++ Engineer - High Performance Computing (HPC)

Alignerr Corp.; Seattle (WA); Remote; USD 83,000 - 165,000; Part time

Job summary

Alignerr is seeking a senior C++ engineer to design, build, and scale high-performance systems powering AI data pipelines and evaluation infrastructure. The role focuses on performance-critical engineering, backend services, and tooling for large-scale data annotation and quality control.

You will work on data pipelines, evaluation workloads, and production-grade C++ systems, collaborating with data, research, and engineering teams.

Qualifications

• 5+ years of production-grade C++ experience (C++17/20)
• Strong understanding of computer architecture, SIMD intrinsics, and cache coherency
• Expert in lock-free programming and maximizing parallelism using threading libraries
• Native or fluent English communication skills

Responsibilities

• Design, build, and optimize high-performance C++ systems for AI data pipelines and evaluation workflows
• Develop backend services and tooling for large-scale data annotation and quality control
• Improve reliability, performance, and safety across existing C++ codebases
• Identify and resolve bottlenecks in data and system behavior with scalable solutions
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Participate in design reviews and contribute to system architecture decisions

Skills

C++

Modern C++ (C++17/20)

Performance optimization

Multithreading

System architecture

English communication

Tools

SIMD intrinsics

Lock-free programming libraries

Job description

About The Role

What if your deep systems programming expertise could directly shape the infrastructure powering the next generation of AI? We're looking for senior C++ engineers to build, optimize, and scale the high-performance systems that leading AI labs depend on — from data pipelines and annotation tooling to evaluation infrastructure and backend services.

This is a fully remote, flexible contract role working at the frontier of AI development. If you live and breathe modern C++ and thrive on performance-critical engineering challenges, this is where your skills make the biggest impact.

• Organization: Alignerr
• Type: Hourly Contract
• Location: Remote
• Commitment: 20–40 hours/week

What You'll Do

• Design, build, and optimize high-performance C++ systems supporting AI data pipelines and evaluation workflows
• Develop backend services and full-stack tooling for large-scale data annotation, validation, and quality control
• Improve reliability, performance, and safety across existing C++ codebases
• Identify and resolve bottlenecks and edge cases in data and system behavior with scalable, production-ready solutions
• Collaborate with data, research, and engineering teams to support model training and evaluation workflows
• Participate in synchronous design reviews and contribute to system architecture decisions

Who You Are

• 5+ years of professional experience writing production-grade C++ — you're fluent in modern standards (C++17 or C++20 preferred)
• Deep understanding of computer architecture, SIMD intrinsics, and cache coherency — you know how to squeeze performance out of compute-heavy workloads
• Expert in lock-free programming and maximizing parallelism using threading libraries
• Strong full-stack developer with a solid systems programming background
• Native or fluent English speaker with clear written and verbal communication skills
• Available to commit 20–40 hours per week consistently

Nice to Have

• Prior experience with data annotation, data quality pipelines, or evaluation systems
• Familiarity with AI/ML workflows, model training, or benchmarking pipelines
• Experience with distributed systems or developer tooling
• Background in high-performance computing, game engines, or financial systems

Why Join Us

• Work on cutting-edge AI projects alongside leading research labs at the frontier of the field
• Fully remote and flexible — work from wherever you do your best thinking
• Freelance autonomy with the structure of meaningful, high-impact engineering work
• Tackle genuinely hard performance and systems challenges that push the limits of modern C++
• Potential for ongoing work and contract extension as new projects launch