Junior Mainframe Developer (COBOL)

AI Trainer Jobs; United States; Remote; USD 148,000 - 210,000; Full time

Benefits offered by this job

Remote work

Contractor role

Hourly pay after interview

Job summary

AI Trainer Jobs is seeking a Junior Mainframe Developer (COBOL) for a remote contractor role focused on evaluating production code, debugging traces, and AI outputs for correctness. You will reproduce failures, write minimal unit tests, and explain fixes so the modeling team can target gaps.

The role offers remote work with US eligibility, paid at $130/hr after the interview. Candidates should show strong code-reading, debugging, and testing skills across frameworks such as pytest, Jest, JUnit,

Qualifications

• Experience in evaluating production code and debugging traces.
• Ability to write minimal failing tests and explain fixes.
• Strong reasoning and documentation for code review tasks.

Responsibilities

• Run and reproduce candidate code outputs in a sandboxed environment.
• Grade engineering review solutions for correctness, style, and edge cases.
• Write the smallest failing test that demonstrates a bug.
• Compare paired solutions and provide a rationale tied to rubric.

Skills

Code review

Debugging

Unit testing

Software engineering

Review writing

Tools

pytest

Jest

JUnit

Go test

RSpec

Job description

Junior Mainframe Developer (COBOL) is a remote engineering review track for evaluating production code, debugging traces, and developer-facing AI outputs against real-world correctness standards. Reviewers reproduce failures, write the unit test the model should have written, and explain the fix so the modeling team can target the gap.

Category: Coding, SWE & Agent Evaluation · Pay: $130 / hr · Location: Remote — US-eligible · Contractor

Junior Mainframe Developer (COBOL) is a remote engineering review track for evaluating production code, debugging traces, and developer-facing AI outputs against real-world correctness standards.

About the role

Junior Mainframe Developer (COBOL) is a remote engineering review track for evaluating production code, debugging traces, and developer-facing AI outputs against real-world correctness standards. Reviewers reproduce failures, write the unit test the model should have written, and explain the fix so the modeling team can target the gap.
Engineering model quality lives or dies on whether the generated code actually compiles, passes tests, and handles edge cases. AuraOne pairs experienced engineers with the modeling team to grade outputs the way a code reviewer would.
Judge generated code and software engineering agents. Read their debugging traces.

Responsibilities

• Run and reproduce candidate code outputs in a sandboxed environment for Junior Mainframe Developer (COBOL) assignments.
• Grade junior mainframe developer engineering review solutions for correctness, style, and edge-case handling.
• Write minimal failing tests that demonstrate the bug a model output missed.
• Compare paired solutions and rank them with a written rationale tied to the rubric.

Role details

Track Code review & evaluation Work model Remote · Independent specialist contractor Compensation Hourly rate confirmed after the interview process. Eligible from US

What you should bring

• Strong day-job engineering experience — you can read, run, and debug unfamiliar code for Junior Mainframe Developer (COBOL) work.
• Comfort writing concise unit tests that capture a single failure mode.
• Familiarity with a testing framework. pytest, Jest, or JUnit. Go test, RSpec, or whatever you use.
• Clear written reasoning — your review note has to convince another senior engineer.
• Reliable async availability for at least 10 hours per week.
• Prior code-review or technical-interview-grading experience is a plus.

Role signals

Example tasks

• Reproduce a generated engineering solution to a coding task, run the test suite, and grade it.
• Write the smallest failing test that demonstrates a model's edge-case bug.
• Compare two paired solutions and rank them with a written rationale tied to the rubric.
• Triage a security issue surfaced by a model and document the patch the model should have produced.

Useful experience

• Open-source contributions or a public portfolio that demonstrates production-quality code.
• Experience with the target language's standard tooling, linters, and idiomatic style guides.
• Familiarity with security-review checklists (OWASP, CWE) and AppSec patterns.

Compensation and schedule

Hourly rate confirmed after the interview process.
Expected arrangement: contractor , with program-defined task volume and review pacing. Placement depends on current program demand and reviewer confirmation.

Skills used in matching

• Code review
• Debugging
• Unit testing
• Software engineering judgment
• Junior Mainframe Developer engineering review
• Software engineering

Application boundary

Creating a specialist profile records your experience and preferences. Starting role intake is a separate action that attaches this role to your candidate record.

Specialist intake

The intake preserves your chosen role, the visible terms, and source attribution for reviewer context.
- 01 Confirm profile and eligibility details.
- 02 Attach this role deliberately.
- 03 Receive a human review decision or follow-up.
Placement timing depends on program demand and reviewer confirmation.