Mindrift is hiring a Senior Python Engineer for a freelance project focused on AI testing for leading tech companies. You will build and manage test systems, ensuring high-quality, reproducible results while leveraging LLMs to enhance development speed and code quality.

What You'll Do

Create functional black-box tests for large codebases in various source languages.
Build and manage Docker environments to ensure 100% reproducible builds and test execution across platforms.
Monitor code coverage and configure automated scoring criteria to meet industry benchmark standards.
Leverage LLMs like Claude Code and Roo Code to accelerate development cycles, automate repetitive tasks, and improve overall code quality.

What We're Looking For

5+ years of experience as a Software Engineer, primarily using Python.
Deep experience with pytest (fixtures, session-scoped, timeouts) and designing black-box functional tests for CLI tools.
Expert-level Docker skills (reproducible Dockerfiles, user contexts, secure workspaces).
Strong Linux & Bash scripting skills and comfort debugging inside containers.
Proficiency with modern Python tooling (uv, pyproject.toml, packaging).
Ability to read and understand code in multiple languages (e.g., C, C++, Rust, or Go) with the aid of LLMs.
Experience using LLMs (Claude Code, Roo Code, Cursor) to accelerate iterative development and test-case generation.
English language proficiency at B2 level or higher.

Nice to Have

Prior experience with agent evaluation platforms and MCP CLI.

Technical Stack

Python: pytest, uv, Pillow
Infrastructure: Docker, Bash, Git Submodules, Dagger, GitHub Codespaces
Languages: C/C++/Rust/Go (reading)
Tools: LLMs (Claude Code, Roo Code, Cursor), coverage.py, gcov, kcov

Benefits & Compensation

Freelance project-based collaboration via the Mindrift platform (powered by Toloka AI).
Fully remote and flexible participation — choose when and how much to contribute (20-30 hours per week).
Task-based compensation, equivalent to up to $80/hour depending on performance and volume.
Opportunity to contribute to innovative AI projects for leading tech companies.
Supportive global community.