Backend Developer - AI Trainer (Netherlands)
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Before you apply
LocationNetherlands
Work moderemote
Typepart-time
SenioritySenior
Experience3–7 yrs
DepartmentSoftware Engineering
Company size1,001–5,000 people
PostedSep 14, 2026 · 1mo ago
Verified live3d ago
May no longer be actively hiring
69% of this company's open roles have been listed for 90+ days
Reposted once in the last 6 monthsEarliest listing first seen Sep 10, 2026
How we check a job is still liveAt a glanceSummarised by Seekless from the posting.
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
Skills
Python
JavaScript
TypeScript
Java
C#
Go
pytest
Jest
JUnit
xUnit
About the role
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
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Develop and extend unit and integration test suites
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Review peer-generated tasks for correctness, clarity, and realism
•
Identify edge cases, ambiguities, and potential failure modes
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Ensure alignment between specifications, code, and expected outputs
Expected Outcomes:
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High-quality, production-realistic coding tasks
•
Complete and correct reference implementations
•
Robust test coverage and validation artifacts
•
Structured, actionable peer review feedback