Full-Stack Developer - AI Trainer

Chromestarchemicals; Indonesia; Hybrid; IDR 370,057,000 - 986,819,000; Part time

Job summary

Chromestarchemicals is seeking a remote part-time consultant to design and evaluate realistic software engineering tasks. You will create bug-fixing scenarios, feature implementations, refactoring, and test generation, while reviewing peer submissions for quality and realism.

You will work on a per-project basis with flexible hours, providing your own tools and managing your schedule, potentially serving multiple clients in parallel.

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

Responsibilities

• 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

Skills

English Proficiency

3–7 years exp

Backend / Full-stack

Testing frameworks

Debug multi-file codebase

Code reviews

Job description

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