Competitive Programming Expert - Freelance AI Trainer en España

We're building competitive-programming problems and their automatic graders (test cases + checkers) used to train advanced AI coding models. You'll create problems, write both correct and deliberately-wrong solutions, and design the tough test cases that catch subtly-broken code. Your work is what makes the training signal trustworthy.

To apply, share: your competitive-programming handle(s) + current/peak rating, any problem-setting experience, and IOI/ICPC/olympiad history.

• Write original algorithmic problems - clear statement, sound constraints, an intended solution;
• Write correct solutions in C++ and Python;
• Write realistic wrong solutions (common mistakes) to test against;
• Build and harden test cases: generators, edge cases, stress and "hacking" tests;
• Write checkers/interactors (testlib) for problems with more than one valid answer;
• Confirm the quality bar: correct solutions pass, wrong ones fail, within time limits.

• Strong competitive programming background, shown by a public profile - a Codeforces rating (see levels below), OR an IOI / ICPC / national-olympiad record;
• Fluent contest C++ (STL, complexity); comfortable writing Python;
• Can explain why a solution is wrong and build an input that breaks it;
• Strong written English (C1+).

Levels (by Codeforces rating, or equivalent olympiad achievement):

• Associate - 1700-2100 (Expert / Candidate Master): easier problems;
• Expert - 2200-2600 (Master / Grandmaster): harder problems
• Senior / Reviewer - 2600+ (Int'l Grandmaster) or IOI/ICPC medalist: hardest problems + quality review.

• IOI / ICPC alumni and top competitive programmers especially encouraged to apply;
• Experience setting or testing problems for real contests (Codeforces rounds, ICPC, national olympiads, online judges);
• Testlib experience (checkers, validators, generators);
• Experience creating data for LLM code benchmarks or similar RL / evaluation datasets.

Paid per accepted task. Your rate depends on the qualification tier you reach and how efficiently you complete tasks - up to the equivalent of $90/hr. Because payment is per task, a faster pace raises your effective hourly rate.

For this project, tasks are estimated to require around 10-20 hours per week during active phases, based on project requirements. This is an estimate, not a guaranteed workload, and applies only while the project is active. Tasks must be submitted by the deadline and meet the listed acceptance criteria to be accepted.

Apply → Pass qualification(s) → Join a project → Complete tasks → Get paid

Please submit your CV in English and indicate your level of English proficiency.

Mindrift connects specialists with project-based AI opportunities for leading tech companies, focused on testing, evaluating, and improving AI systems. Participation is project-based, not permanent employment.