Senior Python Systems Developer - Functional Testing Project
Mindrift offers remote, project-based opportunities for experienced specialists to advance AI systems in partnership with leading tech companies. As part of this freelance collaboration, you will be responsible for creating and executing functional black box tests, building reliable Docker environments, monitoring code coverage, and leveraging modern LLM tools such as Roo Code and Claude Code. Participation is flexible, typically requiring 20-30 hours/week, with compensation of up to $40/hour depending on the project scope, all through the Mindrift platform.
Ideal candidates have 5+ years of Python engineering experience, deep proficiency in pytest, expert-level Docker and Linux skills, and the ability to read multiple programming languages (C/C++, Rust, or Go). Familiarity with tools like Dagger, uv, Bash, GitHub Codespaces, and LLMs is required. A B2 or higher English level and prior exposure to agent evaluation platforms and MCP CLI are important.
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
This project is suited for a Senior Python developer with deep functional testing experience, strong Linux and Docker skills, the ability to read code across multiple languages with the support of LLMs (e.g., C, Rust, Go) and translate requirements for migration tasks, and confidence using tools like Roo Code or Claude Code to accelerate iterative development.
Key Responsibilities
- Create functional black box tests for large codebases in various source languages
- Create and manage Docker environments to ensure 100% reproducible builds and test execution across different platforms
- Monitor code coverage and configure automated scoring criteria to meet industry benchmark-level standards
- Leverage LLMs (Roo Code, Claude) to accelerate development cycles, automate repetitive tasks, and improve overall code quality
- 5+ years of experience as a Software Engineer (primarily 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 with LLM many coding languages (for example C, C++, Rust, or Go)
- Experience using LLMs (Claude Code, Roo Code, Cursor) to accelerate iterative development and test-case generation
- English language - B2 or higher
Requirements +
- Prior experience with agent evaluation platforms and MCP CLI
Tools and Technologies: Python (pytest, uv, Pillow), Docker, Bash, Git Submodules, C/C++/Rust/Go (reading), Dagger, GitHub Codespaces, LLMs (Claude Code, Roo Code, Cursor), coverage.py, gcov, kcov.
What we can offer
- 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)
- Each project has its own compensation level based on scope and expertise required. On this project, AI trainers earn up to $40 per hour equivalent.
- Opportunity to contribute to innovative AI projects for leading tech companies
- Supportive global community
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