C++ AI Code Review Engineer

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We help freelancers discover specialized projects, build a unified portfolio of AI training work, and grow a durable freelance career — all from one place.

About AI training and why it matters

AI training (data labeling / human feedback) is the human side of building intelligent systems: people evaluate model outputs, correct errors, and produce reference examples so models learn safe, correct behavior. This work is highly flexible, often remote, and directly shapes how state-of-the-art AI systems behave.

The role

You will be a C++ AI Code Review Engineer responsible for evaluating AI-generated C++ code, system designs, and technical explanations. Your reviews will include producing high-quality reference implementations and step-by-step reasoning to justify assessments and suggested fixes.

• Assess AI responses for correctness, clarity, safety, prompt adherence, and reasoning quality
• Identify issues in logic, memory handling, concurrency, and performance
• Produce reference solutions and clear, reproducible explanations for reviewers and models
• Compare and rank multiple model outputs by technical accuracy and reasoning

What you'll do day-to-day

Work on repeated review tasks within project guidelines, maintaining consistency and high quality across evaluations.

• Review source materials and model outputs against project-specific guidelines
• Write expert responses with step-by-step technical reasoning in English
• Detect subtle correctness issues: lifetime/safety bugs, data races, deadlocks, undefined behavior, and performance regressions
• Create example implementations or pseudo-code demonstrating correct approaches
• Rank and annotate multiple model-generated solutions for training and RLHF workflows

Requirements

You must bring deep, practical C++ expertise and strong written communication in English. Prior experience evaluating AI-generated technical content is a strong plus.

• Advanced modern C++ knowledge (C++11 and later): templates, move semantics, smart pointers, STL
• Proven experience conducting detailed C++ code reviews focused on safety, performance, and maintainability
• Strong systems programming background: concurrency, OS concepts, memory management, low-level performance
• Hands-on experience with build systems, compilers, linkers, debuggers, and profiling tools
• Comfortable with version control, CI/CD workflows, and automated testing frameworks
• Ability to write clear, methodical technical explanations and step-by-step reasoning in English
• Prior work evaluating AI-generated technical content or training data for technical domains is strongly preferred

Schedule, pay, and location

This is hourly contractor work with remote availability. The role requires a minimum commitment of 20+ hours per week and offers ongoing project opportunities for strong performers.

• Pay: $65/hour (contractor, hourly)
• Estimated project earnings (as shown on the posting): $6,400–$10,400 depending on schedule and duration
• Languages: English required
• Eligible countries (remote): VN, TL, TH, SG, PK, PH, NP, MY, LK, KH, ID, BT, BD, IN, BR, DE, US

How it works and who should apply

OpenTrain handles hiring and contracting for this project. Apply if you are an experienced C++ engineer who enjoys deep technical review work, clear written explanations, and contributing to how AI systems are taught to reason about code.

• Ideal for senior engineers, systems programmers, or experienced C++ reviewers comfortable producing reference implementations and thorough technical write-ups
• Work is project-based and iterative: expect repeated small tasks that require consistent judgment and attention to subtle issues
• If you meet the requirements, build your OpenTrain profile and apply to be considered for this and future C++ evaluation projects