Integration Developer — API Specialist

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. We connect people with hands-on work that teaches AI systems how to behave — and provide the training, projects, and community people need to grow in this fast-moving field.

OpenTrain AI is the hiring and contracting organization for this role. Creating an OpenTrain account is free and lets you apply quickly to projects like this one.

Why AI training matters

AI training (data labeling and human evaluation) is the human side of building modern AI: people create, review, and rate examples so models learn correct behavior. It’s highly flexible, often remote, and a direct way to influence state-of-the-art systems.

Work like this is accessible to many skill levels but also rewards specialist knowledge — here, your API and integration experience will shape how models propose and validate real-world system connections.

The role — what you'll do

As an Integration Developer (API Specialist) you will create evaluation prompts and judge AI outputs focused on system integration, interoperability, and reliable data transfer. Tasks emphasize REST APIs, webhooks, data mapping, schema validation, and error handling.

This is a contract, part-time role requiring roughly 20+ hours per week. Work is remote but must follow the location restrictions listed below.

• Design prompts and test cases that challenge models to propose integrations between CRMs, ad platforms, email tools, databases (Airtable, Google Sheets, Notion), and other SaaS systems.
• Evaluate AI-generated integration plans, payloads, workflow steps, and function-calling outputs for correctness, security, and robustness.
• Annotate or rate responses using rubrics and produce feedback used for RLHF and fine-tuning.

Skills and requirements

You must be experienced building API integrations using REST APIs and webhooks, comfortable reading technical API documentation, and able to troubleshoot data and connectivity issues independently.

You should be able to map data between systems, design simple data pipelines, and understand tradeoffs between real-time and batch processing.

• Proven hands-on experience with REST APIs and webhooks integration and connecting SaaS tools and business systems.
• Experience with text annotation, rubric-based QA, or evaluating LLM outputs (preferred: assessing legal reasoning quality).
• Skilled at troubleshooting API failures, schema mismatches, authentication issues, and data errors.
• English proficiency at B2 or higher required; CV must be in English and state your English level, and include email address and phone number.

Project format, pay, and time commitment

This is a contractor, part-time position. Expect to work 20+ hours per week on a pay-per-hour basis.

Pay range for this role is $15–$45 USD per hour; actual rate within that range will be set according to experience and task complexity.

• Employment type: Contractor, Part-time.
• Time requirement: 20+ hours/week.
• Payment: Pay-per-hour, USD $15–$45/hr.

How the work is evaluated

Your annotations and ratings will be used for evaluation rating tasks, RLHF and fine-tuning datasets, coding/function-calling assessments, and other model-improvement workflows.

Expect to follow clear rubrics, provide constructive feedback on model outputs, and document edge cases and frequent failure modes.

• Label types include evaluation ratings, fine-tuning labels, RLHF feedback, programming/coding checks, and function-calling verification.
• You'll use provided tooling and guidelines; prior experience with rubric-driven QA is strongly beneficial.

How to apply and location restrictions

To apply, submit a CV in English that states your English proficiency level and includes your email address and phone number. Include examples or a short description of past API/SaaS integration work when possible.

This role is remote and worldwide except for specific restricted locations listed below — please do not apply if you are located in one of the restricted countries, territories, or states.

• Restricted locations: Iran, Cuba, North Korea, Syria, Sudan, Venezuela, Myanmar, Russia, Belarus, Palestine; Switzerland; China, Taiwan; Kenya; the following US states: Alaska, Arkansas, California, Connecticut, Delaware, Georgia, Hawaii, Illinois, Indiana, Kansas, Louisiana, Maine, Maryland, Massac
• Please ensure your application materials are accurate and in English.