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Software Engineering Evaluation Specialist en Barcelona,… - Jobeax

Software Engineering Evaluation Specialist en Barcelona, España is listed on Jobeax. Browse 80,000+ vacancies available.

What you'll do

Invent a realistic developer scenario - a real bug, a broken ETL, a missing feature - not a toy problem.
Build a reproducible Docker environment with pinned dependencies.
Write a pytest that verifies outcomes, not specific commands - deterministic, non-flaky, and does not leak the fix.
Write an https://jobeax.com/link/HkFvsHT8ADjCqmv9 that reads like a Jira ticket a developer would receive.
Write a reference https://jobeax.com/link/CUdYvpFg5T5uOD03 proving the task is solvable.
Calibrate difficulty so current state-of-the-art agents solve the task 20-60% of the time.
Iterate based on feedback from expert QA reviewers.
Later: review other authors' tasks as a QA reviewer.

Nice to have

Domain depth in Security, System Administration (nginx / systemd / cron), Scientific Computing (NumPy / PyTorch / SciPy), DevOps, or Git internals.
Modern Python tooling (uv, poetry, https://jobeax.com/link/YRJr577iA0aMx5co).
Coverage tooling (pytest-cov, https://jobeax.com/link/khUWQLUnflUiPBzz, gcov, llvm-cov, kcov).
Fuzzing or property-based testing (Hypothesis).
Prior contribution to agent-evaluation benchmarks or related frameworks.

What you'll get

Paid contributions, rates up to $35/hour*.
Task-based compensation equivalent to hourly rate, depending on performance and volume.
Some projects include incentive payments.

*Rates vary based on expertise, skills assessment, location, project needs, and other factors. Higher rates may be provided to highly specialized experts. Lower rates may apply during onboarding or non-core project phases. Payment details are shared per project.

Job description

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.

About the Role

You'll design coding tasks that challenge frontier AI coding agents. Each task is a self-contained Docker environment with a broken piece of software; an AI agent attempts the fix; automated tests verify the outcome. Your deliverable is the full task package: broken code, tests, instructions, and a reference solution proving the task is solvable.

Not in scope

Data labeling, prompt engineering.
Production code to ship - you design problems and verification for AI agents.
Leetcode puzzles - scenarios must look like real developer work.
Not every candidate task ships - quality over quantity.

Requirements

3+ years of production software development in one backend stack - Python, Go, https://jobeax.com/link/JSd7UYCSg572jJDY, Java, or Rust. Depth in one stack beats breadth.
Python + pytest fluency - required regardless of primary stack. The task harness is pytest-based even when the broken app is in another language. Fixtures, parametrize, monkeypatch, timeouts, conftest.py.
Docker authoring - reproducible Dockerfiles, pinned dependencies, multi-stage builds when needed, non-root user.
Linux & Bash - comfort debugging inside containers (strace, lsof, journalctl); shell beyond set -euo pipefail.
AI coding agent experience - Claude Code, Cursor, Roo Code, or similar, on non-trivial work. You can cite a specific time the AI was confidently wrong and how you caught it.
English - B2+ written.

Not a fit

Data Science, ML, or Computer Vision engineers without backend-engineering output.
Manual QA testers without automation or test authoring.
Frontend-only, low-code / no-code, IT Support, or Business Analysts.
Engineers who have never written pytest from scratch.
Junior, intern, or assistant as the most recent role.

Process

Apply → Pass qualification (90-minute sample-task screen + short behavioral interview) → Join a project → Complete tasks → Get paid.

Time commitment

Onboarding: ~10 hours per first task.
Steady state: ~5 hours per task, 2-4 parallel tasks per author.
Realistic weekly load: 8-20 hours. Higher volume available for top performers.
You choose when and how to contribute; tasks must be submitted by the deadline and meet acceptance criteria.

Apply

Submit your CV via the Mindrift platform. Indicate your English level, note this role (Software Engineering Evaluation Specialist - Terminal Bench), and include a GitHub profile link if available.

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