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Backend Developer - AI Trainer in Spain

Remote Contract

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Experience Level

Experience

Qualifications

Exceptional written English proficiency3–7 years of software engineering experienceExpertise in Python and JavaScript/TypeScript; familiarity with Java, C#, or Go is a plusExperience in backend or full-stack development within production environmentsKnowledge of testing frameworks (like pytest, Jest, JUnit, xUnit, Go testing)Proficient in debugging and navigating through extensive, multi-file codebasesExperience in conducting code reviews, refactoring, and handling production migrations

About the job

Anyone AI seeks experienced Backend Developers based in Spain to support a high-profile AI laboratory project. This remote, part-time role centers on expert evaluation tasks and the creation of realistic software engineering exercises.

Role overview

As a Backend Developer - AI Trainer, the primary focus is on designing and assessing complex coding challenges. Tasks include bug fixes, feature development, refactoring, migrations, and test generation. The position involves both creating coding scenarios and reviewing peer submissions for accuracy and quality.

Responsibilities

  • Design and implement multi-file coding assignments covering bug resolution, new features, refactoring, and testing
  • Write clear, natural-language specifications and provide reference implementations
  • Develop and improve unit and integration test suites
  • Review and evaluate peer-generated tasks for correctness, clarity, and realism
  • Identify edge cases, ambiguities, and potential failure points
  • Ensure alignment between specifications, code, and expected results

Requirements

  • Exceptional written English skills
  • 3–7 years of experience in software engineering
  • Advanced proficiency in Python and JavaScript or TypeScript; familiarity with Java, C#, or Go is a plus
  • Background in backend or full-stack development within production settings
  • Knowledge of testing frameworks such as pytest, Jest, JUnit, xUnit, or Go testing
  • Strong debugging skills and the ability to navigate large, multi-file codebases
  • Experience with code reviews, refactoring, and production migrations

Engagement details

  • Part-time, project-based work
  • Remote from anywhere in Spain

Expected outcomes

  • Deliver high-quality, production-ready coding tasks that meet industry standards

About Anyone AI

Anyone AI is a forward-thinking company dedicated to advancing artificial intelligence through innovative software development. We aim to connect skilled professionals with exciting projects in collaboration with leading AI laboratories.

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