Backend Developer - AI Trainer

Anyone AI Inc.; France; Hybrid; EUR 83,000 - 165,000; Part time

Job summary

Anyone AI is seeking skilled Backend Developers to work as project consultants on a part-time, remote basis. You will design and evaluate realistic software engineering tasks, including bug resolution, feature implementation, refactoring, and test generation.

Requirements include advanced professional English, 3–7 years of software engineering experience, backend or full‑stack production‑level work, and experience with testing frameworks.

Qualifications

• Advanced English written proficiency.
• 3–7 years of professional software engineering experience.
• Backend or full-stack development in production systems.
• Experience with testing frameworks (pytest, Jest, JUnit, xUnit, Go testing).
• Proven ability to debug and navigate large, multi-file codebases.
• Experience with code reviews, refactoring, and production migrations.

Responsibilities

• Design and implement multi-file coding tasks across bug fixing, feature development, and testing.
• Write clear specifications and reference implementations.
• Develop and extend unit and integration test suites.
• Review peer submissions for correctness, clarity, and realism.
• Identify edge cases and potential failure modes.
• Ensure alignment between specifications, code, and outputs.

Skills

English Proficiency

Experience Years

Backend Expertise

Code Review

Debugging

Tools

pytest

Jest

JUnit

xUnit

Go testing

Job description

Anyone AI is recruiting skilled Backend Developers to work as a project consultants.

Qualifications:

Advanced professional written proficiency in English

3–7 years of professional software engineering experience

Backend or full‑stack development experience in production systems

Experience with testing frameworks (e.g., pytest, Jest, JUnit, xUnit, Go testing)

Proven ability to debug and navigate large, multi‑file codebases

Experience with code reviews, refactoring, and production migrations

Engagement: Part-time, project-based expert evaluation work

Work Type: Remote

Contributors will design and evaluate realistic software engineering tasks, including bug resolution, feature implementation, refactoring/migration, and test generation. Work includes both creating complex coding scenarios and reviewing peer submissions for quality and accuracy.

This is a project-based consultant role. Consultants will be paid on a per-project basis; hourly rates are estimates based on anticipated completion time. Consultants control their own schedule, provide their own tools, and may simultaneously provide services to other vendors/employers (subject to those vendors’ allowances).

Responsibilities:

Contributors will:

Design and implement multi-file coding tasks across bug fixing, feature development, refactoring, and testing

Write clear natural-language specifications and reference implementations

Develop and extend unit and integration test suites

Review peer-generated tasks for correctness, clarity, and realism

Identify edge cases, ambiguities, and potential failure modes

Ensure alignment between specifications, code, and expected outputs

Expected Outcomes:

High-quality, production-realistic coding tasks

Complete and correct reference implementations

Robust test coverage and validation artifacts