Remote Sr. C Engineer – Codebase Exploration & AI Reasoning

Weekday 1; United States; Remote; Part time

Job summary

Weekday 1 seeks experienced C engineers to build datasets that help AI agents reason about real codebases. This remote, contract, task-based role pays $130 per approved task and focuses on high-stakes projects across major codebases such as PostgreSQL, Redis, git, and OpenSSL.

You will select tasks from a pre-validated pool, explore repositories to understand subsystems, and rewrite questions to challenge frontier agents while remaining clearly answerable.

Qualifications

• 3+ years of professional software engineering experience with substantial production C.
• Navigate large unfamiliar C codebases and explain runtime behavior.
• Comfort with preprocessor-heavy builds, platform conditionals, manual memory management.
• Experience with databases, cryptography, networking or systems programming.
• Ability to use debuggers, sanitizers, tracing and profilers.
• Precise written English; the questions and rubrics you write are the product.

Responsibilities

• Select tasks from a pre-validated pool of C repositories, each pinned to a specific git commit and arriving with an engineering question, positive and negative rubrics, foils, and a golden solution.
• Explore the repository until you genuinely understand the subsystem in question, including the relevant PR or issue history.
• Rewrite the task's question so it defeats frontier coding agents while remaining well-defined and fairly answerable.
• Adjust rubrics and foils so they reward correct reasoning and reject plausible-but-wrong answers.
• Run the full validation loop in Studio — Check, Golden, Run, Analyze — and iterate until every stage passes.
• Document your work in the task README and submit for expert review, addressing reviewer feedback on returned tasks.

Job description

Weekday 1 seeks experienced C engineers to build datasets that help AI agents reason about real codebases. This remote, contract, task-based role pays $130 per approved task and focuses on high-stakes projects across major codebases such as PostgreSQL, Redis, git, and OpenSSL.

You will select tasks from a pre-validated pool, explore repositories to understand subsystems, and rewrite questions to challenge frontier agents while remaining clearly answerable.