Backend Java Developer for AI Training

Other Jobs To Apply

About OpenTrain

OpenTrain 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 worldwide
  • Part-time schedule of 20+ hours per week
  • Apply through OpenTrain and build an AI training portfolio

About AI Training Work

AI 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 systems
  • Use software engineering expertise in a cutting-edge industry
  • Contribute remotely with flexible part-time contracting

The Role

OpenTrain 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 time
  • Time requirement: 20+ hours per week
  • Pay: $60-$110 per hour
  • Language: English
  • Location: Worldwide and fully remote

What You'll Do

You 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 Boot
  • Architect robust microservices solutions for complex application requirements
  • Review technical specifications and deliver high-quality, maintainable code
  • Improve application performance, reliability, and security through informed engineering decisions
  • Participate in code reviews and provide constructive feedback on implementation quality
  • Document technical processes and solutions with clear, concise written communication
  • Troubleshoot, debug, and optimize backend systems as needed

Required Skills

The 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 programming
  • Hands-on experience with Spring Boot backend development
  • Strong understanding of microservices architecture and REST APIs
  • Knowledge of data structures and backend engineering best practices
  • Ability to write clean, efficient, and maintainable code
  • Ability to troubleshoot and optimize backend performance, reliability, and security
  • Excellent written and verbal communication
  • Careful attention to detail
  • Experience collaborating with remote teams

Helpful Background

The 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 Cloud
  • Experience with distributed systems
  • Background working with high-availability systems
  • Prior experience with AI-driven or data-intensive projects

How to Build Your AI Career With OpenTrain

OpenTrain 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.

  • Create a free OpenTrain account
  • Showcase your backend engineering experience
  • Apply to remote AI training opportunities in minutes
Back to blog

Other Jobs To Apply

EHR Access BI Developer [Must be Certified in COGITO FUNDAMENTALS AND ACCESS DATA MODEL]

Site Reliability Engineer (SRE)

Principal Software Engineer, Networking

Full-Stack Developer / Shopify Expert (eCommerce CRO Focus)

Senior Remote WordPress Developer ( Remote / Contract )

Database Administrator II (Remote from anywhere in Colorado)

Mainframe Network Engineer (Hybrid Role)

System Administrator (Remote)

MSP Service Desk & Support Specialist (Remote)

Technical Support Representative - Remote

QA Engineer (Remote)

Cyber Security Specialist Remote

Sr. Data Scientist, tvScientific

Mainly Remote to Denver Data Engineer - Staff Consultant

Azure Consultant – Remote DevOps & Automation Architect

AWS Engineer - Fully Remote

Mean Stack Developer

Full Stack Engineer (React Native)

Backend Python Software Engineer (Hybrid)

Web Frontend Engineer - JS, CSS, React, Flutter

Full Stack AI Engineer (Remote from Houston or Austin TX)

Applied AI Software Engineer

Head of Shopping & Amazon Commerce – Feeds & Marketplaces

Senior Cybersecurity Specialist

Federal Staffing Specialist (Fully Remote)

Emergency Radiology (Evenings/Nights) - Hybrid, Remote and On-Site Options Available in Nashville

New Business Manager; O500(St. Louis, MO) - Hybrid

[Remote-Position] Policy Analyst (reputed company Trust Eligible)

Manager, People & Culture

Customer Service Associate, FT Remote

Senior Director, Business Development - West Coast - Remote

-Fully Remote Position (No Experience Needed – Immediate Openings)

Remote Customer Service Representative - Must Reside in NY (Starting 2/23/2026)

4 - Nights & Weekends Remote ServiceTitan Experienced CSR Part-Time

Benefits Service Representative – Remote

Independent Life & Health Insurance Agent — Remote | IUL & Annuity Focus

Remote Freelance Opportunities (Rock Hill)

Junior Production Designer - Contract (Full-time, Temporary)

Customer Experience Representative (CX) | Seasonal - Part Time

WORK AT HOME DATA ENTRY / PART TIME - ADMINISTRATIVE ASSISTANT - REMOTE

Call Center Specialist [Work From Home - Night Shift - Full Time]

Remote App Tester - College Students Only

Chat Support Agent (Remote) - Entry Level, No Degree Required

Senior Manager, SEM

Part Time - Work from Home - Online Product Tester - No experience ($25-$45 per hour)

Machine Learning Manager, Feed Relevance, Retrieval

Entry Level Java/DevOps Developer - Remote

Product Tester (Work From Home) – Keep Free Products + Weekly Pay

Online Product Tester

Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

This is what this question poses: When do you focus and start working seriously? What are the hours you work optimally? Are you a night owl? A morning bird? Remote teams can be made up of people working on different shifts and around the world, so you won't necessarily be stuck in the 9-5 schedule if it's not for you...

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

When you're working on a remote team, there's no way to chat in the hallway between meetings or catch up on the latest project during an office carpool. Therefore, virtual communication will be absolutely essential to get your work done...

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

Many people want to work remotely because of the flexibility it allows. You can work anywhere and at any time of the day...

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

With this question, companies are looking to see what equipment they may need to provide you with and to verify how aware you are of what remote working could mean for you physically and logistically...

5. HOW DO YOU PROCESS INFORMATION?

Several years ago, I was working in a team to plan a big event. My supervisor made us all work as a team before the big day. One of our activities has been to find out how each of us processes information...

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

Or you may receive even more specific questions, such as: What's on your calendar? Do you plan blocks of time to do certain types of work? Do you have an open calendar that everyone can see?...

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

Just like your schedule, how you track files and other information is very important. After all, everything is digital!...

8. HOW TO PRIORITIZE WORK?

The day I watched Marie Forleo's film separating the important from the urgent, my life changed. Not all remote jobs start fast, but most of them are...

9. HOW DO YOU PREPARE FOR A MEETING AND PREPARE A MEETING? WHAT DO YOU SEE HAPPENING DURING THE MEETING?

Just as communication is essential when working remotely, so is organization. Because you won't have those opportunities in the elevator or a casual conversation in the lunchroom, you should take advantage of the little time you have in a video or phone conference...

10. HOW DO YOU USE TECHNOLOGY ON A DAILY BASIS, IN YOUR WORK AND FOR YOUR PLEASURE?

This is a great question because it shows your comfort level with technology, which is very important for a remote worker because you will be working with technology over time...