Remote C Software Engineer — Codebase QA & Validation

mercor

United States

Remote

USD 165,000 - 193,000

Part time

14 days+

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Job summary

Mercor seeks a Software Engineer (C) for a contract role, working remotely with U.S., India, and Nigeria-based leads. You will select and understand C repository tasks, rewrite questions for frontier agents, and ensure rigorous rubrics and validation in Mercor Studio.

Onboarding requires identity verification, background checks, and compliance steps. Strong English writing is essential for crafting questions and rubrics, and experience navigating large C codebases is a must.

Qualifications

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

Responsibilities

Select tasks from a pre-validated pool of C repositories , each with an engineering question and a golden solution.
Explore the repository to understand the subsystem, including relevant PR or issue history.
Rewrite task questions to challenge frontier coding agents while ensuring clarity and fairness.
Adjust rubrics and foils to reward correct reasoning and reject incorrect answers.
Run the full validation loop in Mercor Studio and iterate until every stage passes.
Document work in the task README and address reviewer feedback on returned tasks.