Backend Java Developer for AI Training

About OpenTrainOpenTrain is the #1 platform for finding and building careers in AI training and data labeling. It gives contributors one place to discover projects, build a credible professional profile, and apply their skills to opportunities across a fast-growing industry.

As an OpenTrain contractor, you can develop a durable portfolio around specialized technical work while contributing to systems that support how modern AI is built.

Remote contractor opportunity available worldwidePart-time schedule of 20+ hours per weekApply through OpenTrain and build an AI training portfolioAbout AI Training WorkAI training is the human side of building artificial intelligence. In addition to labeling data and evaluating model outputs, the industry depends on reliable software systems that help organize, process, and support training workflows.

This role applies backend engineering expertise to AI-focused projects. Prior AI experience is not required, making it an opportunity to bring strong software development judgment into a rapidly growing technical field.

Work connected to next-generation AI training systemsUse software engineering expertise in a cutting-edge industryContribute remotely with flexible part-time contractingThe RoleOpenTrain is recruiting a Backend Java Developer to build and improve backend systems that support AI training work. You will design and maintain Java and Spring Boot services, architect microservices solutions, and make informed decisions about code quality, performance, reliability, and security.

The role is suited to a backend developer with expert Java proficiency, hands-on Spring Boot experience, and strong knowledge of scalable backend design. You will also contribute through technical documentation, code reviews, troubleshooting, and collaboration with remote teams.

Role type: Contractor and part timeTime requirement: 20+ hours per weekPay: $60-$110 per hourLanguage: EnglishLocation: Worldwide and fully remoteWhat You'll DoYou will take ownership of backend implementation and help ensure that systems are maintainable, scalable, and dependable. The work combines hands-on Java development with architectural thinking, technical communication, and careful quality review.

Design, develop, and maintain scalable backend systems using Java and Spring BootArchitect robust microservices solutions for complex application requirementsReview technical specifications and deliver high-quality, maintainable codeImprove application performance, reliability, and security through informed engineering decisionsParticipate in code reviews and provide constructive feedback on implementation qualityDocument technical processes and solutions with clear, concise written communicationTroubleshoot, debug, and optimize backend systems as neededRequired SkillsThe primary focus is backend engineering expertise and the ability to apply it carefully to AI training systems. Candidates should be able to communicate clearly, work attentively, and collaborate effectively in a remote environment.

Expert proficiency in Java programmingHands-on experience with Spring Boot backend developmentStrong understanding of microservices architecture and REST APIsKnowledge of data structures and backend engineering best practicesAbility to write clean, efficient, and maintainable codeAbility to troubleshoot and optimize backend performance, reliability, and securityExcellent written and verbal communicationCareful attention to detailExperience collaborating with remote teamsHelpful BackgroundThe following experience is useful but not required. Familiarity with cloud or distributed systems can help you address the reliability and scale expectations of backend work supporting AI-focused applications.

Exposure to AWS, Azure, or Google CloudExperience with distributed systemsBackground working with high-availability systemsPrior experience with AI-driven or data-intensive projectsHow to Build Your AI Career With OpenTrainOpenTrain helps people start and grow careers teaching AI, including through technical work that supports training infrastructure and evaluation workflows. Creating an account is free, and your profile can help you present relevant experience, discover matching opportunities, and build a long-term record of AI training work.

Bring your Java and Spring Boot expertise to a remote role connected to the future of AI. Apply through OpenTrain to take the next step.

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