Competitive Programming Contest Coder

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We help freelancers discover projects, build a unified proof-of-work profile, and grow sustainable freelance careers in the fast-moving AI training industry.

Creating an OpenTrain account is free. As the hiring organization for this role, OpenTrain manages the project, payments, and onboarding so you can focus on producing high-quality technical work.

About AI training work

AI training (also called data labeling or human feedback work) is the human side of building modern AI: people prepare and validate examples, evaluate model outputs, and create tools that guide model behavior. These roles are often fully remote, flexible, and a direct way to shape how real-world AI systems perform.

The role

OpenTrain is recruiting a Competitive Programming Contest Coder to participate in a live Codeforces-style programming contest as a checker/validator. You will implement robust C++ checker solutions, validate outputs, and ensure solution correctness under contest time pressure.

This is a one-time, live contest participation role. You will work as a contractor in a remote setting, expected to contribute 20+ hours/week during the contest window.

What you'll do

• Implement C++ checker programs that validate contestant outputs against problem specifications and edge cases.
• Analyze complex problem constraints and multiple valid solution paths to design reliable validation logic.
• Validate code outputs and check consistency across test cases and corner conditions.
• Deliver well-documented, maintainable code under tight contest deadlines.

Requirements

• Expertise in competitive programming and coding problem analysis.
• Advanced proficiency in C++ for implementing robust checker solutions.
• Strong analytical skills to interpret complex constraints and multiple solution approaches.
• Exceptional written and verbal communication; ability to articulate technical details clearly.
• Meticulous attention to detail when validating outputs and ensuring correctness.
• Experience working independently in a remote environment and commitment to producing high-quality code on deadline.
• Fluent English (project language).

Helpful background

• Prior experience as a problem setter, tester, or checker on major competitive programming platforms is a plus.

Schedule & pay

This is a one-time live contest participation role billed hourly. The role is contractor, part-time, and remote.

• Pay rate: $45–$65 per hour (PAY_PER_HOUR, USD).
• Estimated project earnings: $7,200–$10,400 based on the contest schedule and duration shown on OpenTrain.
• Expected time commitment: 20+ hours/week during the contest.

How it works

Apply through your OpenTrain profile. If selected, you will receive contest details, onboarding instructions, and a clear delivery timeline. OpenTrain handles contracts and payment processing so you can focus on the technical work.

OpenTrain helps you centralize experience and build a lasting portfolio of AI training projects — useful if you want more contest-based or coding-focused AI training work in the future.