Scala AI Training Engineer

About OpenTrain

OpenTrain AI helps people find and build careers in AI training and data labeling. Through OpenTrain, skilled contributors can discover specialized projects, build a professional profile, and apply to work that puts their expertise at the center of how modern AI systems are developed.

• Remote contractor opportunity
• Part-time schedule of 20+ hours per week
• Hourly pay of $70 USD
• Work available to eligible contractors in the listed countries

About AI Training Work

AI training is the human side of building artificial intelligence. Experts write examples, evaluate model responses, identify subtle errors, and explain what makes a technical answer accurate, safe, and useful. This work helps advanced models produce stronger code and more reliable engineering guidance.

• Create high-quality examples that teach AI systems
• Evaluate model outputs for correctness and reasoning quality
• Apply real-world technical judgment to emerging AI tools

The Role

OpenTrain AI is hiring Scala AI Training Engineers for remote hourly contractor work focused on AI-generated Scala code, system designs, and technical explanations. You will write reference answers, detailed prompts, and step-by-step reasoning for complex engineering problems, then assess model outputs for correctness, clarity, safety, performance, and adherence to the prompt.

The work also involves fact-checking technical information and finding subtle issues involving concurrency, distributed systems behavior, JVM performance, functional correctness, and resource handling. You will compare multiple AI responses and determine which solution and reasoning are strongest.

• Intermediate experience level
• Scala and JVM-focused AI evaluation work
• English-language work requiring minimum C1 proficiency
• Contractor and part-time engagement

What You’ll Do

You will combine hands-on Scala engineering knowledge with careful evaluation and explanation. Your work will help distinguish technically sound solutions from responses that contain bugs, unsafe patterns, inaccurate claims, or weak reasoning.

• Review AI-generated Scala code, system designs, and technical explanations
• Write reference implementations and model answers for Scala and JVM topics
• Compare and rank AI responses for correctness, safety, performance, and reasoning quality
• Check concurrency, distributed systems, JVM behavior, and resource-handling issues
• Create detailed prompts and quality explanations that guide model learning
• Validate outputs for inaccuracies, unsafe patterns, and bias across real-world use cases

Required Qualifications

This role requires strong professional Scala experience and the ability to communicate complex engineering concepts clearly in written English. Equivalent practical experience may substitute for the listed degree requirement.

• Production experience with Scala 2.13+ or Scala 3
• Deep JVM fundamentals, including the memory model, garbage collection, profiling, and performance tuning
• Experience with concurrency and effect systems or actor-based systems such as cats-effect, ZIO, Akka, or Pekko
• Distributed systems experience with microservices, messaging, retries, idempotency, backpressure, and consistency tradeoffs
• Strong testing practices, including unit, integration, and property-based testing
• Comfort with sbt, Maven or Gradle interoperability, and version control best practices
• Bachelor’s degree in Computer Science, Software Engineering, or a closely related field, or equivalent practical experience
• Minimum C1 English proficiency and clear technical writing skills
• Prior AI data training, annotation, or evaluation of AI-generated technical content is a strong plus

Work Location and Compensation

This is a remote hourly contractor role requiring at least 20 hours per week. The hourly rate is $70 USD. The opportunity is available in Bangladesh, Bhutan, Brazil, Cambodia, Germany, India, Indonesia, Malaysia, Nepal, Pakistan, Singapore, Sri Lanka, Thailand, the Philippines, the United States, Timor-Leste, and Vietnam.

• Pay: $70 USD per hour
• Time requirement: 20+ hours per week
• Language: English
• Work arrangement: Remote
• Engagement: Contractor, part-time

Apply Through OpenTrain

If you bring strong Scala and JVM engineering expertise and can explain technical decisions with precision, this role offers a direct way to contribute to cutting-edge AI development. Create a free OpenTrain account, build your profile, and apply in minutes.

• Highlight Scala 2.13+ or Scala 3 production experience
• Showcase JVM, concurrency, and distributed systems expertise
• Emphasize clear technical writing and C1 English proficiency
• Include relevant AI evaluation, annotation, or data-training experience