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Backend Developer - AI Trainer (Netherlands)

Anyone AI

Amsterdam
Part-time
5-10 years experience
Remote Only

$25 - $50 per hour

Key Skills

Python
JavaScript
TypeScript
Java
C#
Go
Backend development
Full-stack development
Pytest
Jest
JUnit
XUnit
Code review
Refactoring
Unit testing
Integration testing

Job Description

Anyone AI is recruiting skilled Backend Developer to work on a project with a leading AI lab.

Qualifications:

  • Advanced professional written proficiency in English

  • 3–7 years of professional software engineering experience

  • Strong proficiency in Python and JavaScript/TypeScript; working knowledge of Java, C#, or Go

  • 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

  • Structured, actionable peer review feedback

Core Responsibilities

Contributors will design and implement multi-file coding tasks including bug fixes, feature development, and refactoring. They are also responsible for writing specifications, developing test suites, and providing peer reviews for quality and accuracy.

Requirements

Candidates must have 3–7 years of professional software engineering experience with strong proficiency in Python and JavaScript/TypeScript. They should also possess experience with testing frameworks and the ability to navigate large, multi-file codebases.

About Anyone AI

Industry: Technology, Information and Internet

Company size: 2-10 employees

Our mission is to leverage the power of AI to make unique avatars for you and your friends. ‍ We want to create a new layer of positive connection between people, everyday.

Added 1 months ago