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 and optimize high-performance AI data pipelines and evaluation tooling. This fully remote, hourly contract role focuses on scalable C++17/20 systems, SIMD, and lock-free multithreading to support large-scale AI workloads and frontier model benchmarking.

You will collaborate with research and data teams, review designs, and ship production code that matters.

Qualifications

• 5+ years of professional experience writing production-grade C++.

Responsibilities

• Design, build, and optimize high-performance C++ systems for large-scale AI data pipelines and evaluation workflows.
• Develop full-stack tooling and backend services for data annotation, validation, and quality control at scale.
• Improve reliability, throughput, and safety across existing production C++ codebases.
• Identify performance bottlenecks, edge cases, and systemic issues and implement scalable fixes.
• Collaborate with data, research, and engineering teams to accelerate model training and evaluation cycles.
• Participate in design reviews to iterate on system architecture and implementation decisions.

Skills

C++17/20

High-performance HPC

Multithreading

SIMD

Lock-free

English fluency

Job description

C++ Engineer — High Performance Computing (HPC) for AI

About The Role

What if your expertise in high-performance C++ could directly shape the infrastructure powering next-generation AI? We're looking for a Senior C++ Engineer to build and optimize the systems that leading AI labs depend on — from data pipelines and annotation tooling to evaluation infrastructure that influences how frontier models are trained and benchmarked.

This is a fully remote, flexible contract role for a seasoned systems engineer who wants meaningful, high-impact work at the cutting edge of AI development.

• 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 large-scale AI data pipelines and evaluation workflows
• Develop full-stack tooling and backend services for data annotation, validation, and quality control at scale
• Improve reliability, throughput, and safety across existing production C++ codebases
• Identify performance bottlenecks, edge cases, and systemic issues — then implement scalable, elegant fixes
• Collaborate with data, research, and engineering teams to accelerate model training and evaluation cycles
• Participate in synchronous design reviews to iterate on system architecture and implementation decisions

Who You Are

• Native or fluent English speaker with strong written and verbal communication skills
• Full-stack developer with a deep systems programming background
• 5+ years of professional experience writing production-grade C++ (C++17 or C++20 preferred)
• Deep understanding of computer architecture, SIMD intrinsics, and cache coherency for compute-heavy workloads
• Expertise in lock-free programming and maximizing parallelism using threading libraries
• Able 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 infrastructure
• Experience building distributed systems or developer tooling

Why Join Us

• Work directly on production systems used by leading AI research labs — your code ships and it matters
• Fully remote and async-friendly — work from wherever you do your best thinking
• Flexible hours with meaningful, technically challenging work
• Collaborate with world‑class engineers and researchers on high-impact AI projects
• Potential for ongoing engagement and expanded scope as projects scale