Senior Software Engineering Experts

Mercor is working with a leading AI research lab on a project to improve how AI systems do real-world software engineering work. We're looking for senior software engineers who have deep experience at top technology, quantitative or financial firms. You'll use that expertise to train and evaluate frontier AI models. This role is open to candidates based in the United States, United Kingdom, Canada, Australia or New Zealand. Key Responsibilities

• Designing realistic, challenging software engineering tasks drawn from real-world work, including but not limited to:

  • feature changes in large codebases

  • debugging and root-cause analysis

  • code review

  • system design and architecture decisions

  • codebase Q&A

  • technical documentation and planning

• Writing clear task proposals that explain why each task is realistic, how it is verified and what makes it hard for current AI models

• Illustrating "what good looks like" by writing reference solutions, tests and precise, task-specific criteria covering correctness, architecture, maintainability, style and scope

• Assessing AI-generated code and engineering work, and working alongside AI coding agents to judge where they succeed and fail

• Applying consistent, evidence-based judgment so that assessments are reproducible and defensible

• Taking structured feedback from senior reviewers and iterating on submitted work

Ideal Profile

• 4+ years of professional software engineering experience in one of these settings:

  • A leading technology or quantitative firm (such as FAANG+, Magnificent 7+, top-tier quant funds or equivalent) with a Mid-senior level title. Machine Learning, Infrastructure, Data, Security and Quant Developer engineering roles may also qualify.

  • A top financial institution (a leading bank, hedge fund or trading firm), working as a software engineer

  • A high-growth technology company that is a household name, with a senior-level title

  • Experience may be split across more than one qualifying employer

• Strong command of at least one major language (such as Python, Java, C++, Go, TypeScript or Rust), along with system design, testing, debugging and code review

• Proven ability to work in large, complex production codebases and to judge code quality beyond "it passes the tests"

• Excellent written English, including the ability to explain technical decisions and trade-offs clearly

• Bachelor's degree from an English-speaking country

• A detail-oriented, consistent approach to evaluating complex work

• Comfortable receiving feedback and calibrating judgment against set standards

We consider all qualified applicants without regard to legally protected characteristics and provide reasonable accommodations upon request.

Contract and Payment Terms

• You will be engaged as an independent contractor.
• This is a fully remote role that can be completed on your own schedule.
• Projects can be extended, shortened, or concluded early depending on needs and performance.
• Your work at Mercor will not involve access to confidential or proprietary information from any employer, client, or institution.
• Payments are weekly on Stripe or Wise based on services rendered.
• Please note: We are unable to support H1-B or STEM OPT candidates at this time.

About Mercor

Mercor partners with leading AI labs and enterprises to train frontier models using human expertise. You will work on projects that focus on training and enhancing AI systems. You will be paid competitively, collaborate with leading researchers, and help shape the next generation of AI systems in your area of expertise.