Senior Python Developer - Code Migration Specialist

5/2/2026

Create functional black box tests for large codebases and manage Docker environments to ensure reproducible builds. Leverage LLMs to accelerate development cycles, automate repetitive tasks, and improve overall code quality.

Working Hours

30 hours/week

Company Size

501-1,000 employees

Language

English

Visa Sponsorship

About The Company

Mindrift (mindrift.ai) is the expert-sourcing platform built by Toloka, a Nebius Group (Nasdaq: NBIS) company and a global leader in data services for AI since 2014. Mindrift’s CEO and co-founder, Olga Megorskaya, launched the platform to connect domain experts — from software engineers and physicians to linguists and lawyers — with AI training projects for the world's leading technology companies. Through Mindrift, over 10,000 professionals across 50+ domains and 15+ languages contribute to supervised fine-tuning, reinforcement learning from human feedback (RLHF), model evaluation, and red-teaming for frontier AI models developed by leading global technology companies. Operated by Toloka from Amsterdam, Netherlands, Mindrift offers flexible, fully remote, project-based opportunities — empowering experts to shape the future of generative AI, one task at a time.

About the Role

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 $80 per hour equivalent.
Opportunity to contribute to innovative AI projects for leading tech companies
Supportive global community

Key Skills

PythonPytestDockerLinuxBash scriptingCRustGoLLMsClaude CodeRoo CodeFunctional testingDockerfilesUvGit submodulesDagger