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Freelance Java Backend Developer Jobs in Columbus, OH

Huntington

IS Technical Specialist

Columbus, OH · On-site +1

Bachelor's degree in computer science, Engineering, or related field * 5+ years of experience in Java backend/API development Preferred Qualifications: * 7+ years of experience in Designing and ...

Manifest Solutions

Lead Software Engineer

Dublin, OH

Collaborate with backend teams (Java, Spring Boot) to design clean APIs and efficient data flows. * Bridge UI/UX design and backend engineering, ensuring consistency, performance, and maintainability.

Manifest Solutions

Lead Software Engineer

Dublin, OH · On-site

Collaborate with backend teams (Java, Spring Boot) to design clean APIs and efficient data flows. * Bridge UI/UX design and backend engineering, ensuring consistency, performance, and maintainability.

Huntington

IS Technical Specialist

Columbus, OH · On-site +1

Bachelor's degree in computer science, Engineering, or related field 5+ years of experience in Java backend/API development Preferred Qualifications: 7+ years of experience in Designing and ...

Huntington

IS Technical Specialist

Columbus, OH · On-site +1

Bachelor's degree in computer science, Engineering, or related field * 5+ years of experience in Java backend/API development Preferred Qualifications: * 7+ years of experience in Designing and ...

Huntington

IS Technical Specialist

Columbus, OH · On-site +1

Bachelor's degree in computer science, Engineering, or related field 5+ years of experience in Java backend/API development Preferred Qualifications: 7+ years of experience in Designing and ...

Apex Systems

Java Engineer - OH

Columbus, OH · On-site +1

$81 - $87/hr

Java Engineer Location: Columbus, OH - Hybrid (3 days onsite mandatory) Contract Length: 18 months ... Design, develop, and maintain backend applications using Java and Spring Boot. * Support ...

Econosoft

Java Developer

Columbus, OH

$47.75 - $61.75/hr

* The engineer will own the delivery of complex features across both front-end and back-end systems, translating platform requirements into well-structured implementations that are maintainable ...

Lloyd Staffing

ATM Software Engineer

Columbus, OH · Remote

If youre an experienced engineer with deep ATM domain expertise, this is your chance to design ... Backend: Java, Spring Boot, Spring Cloud Gateway, REST APIs, microservices, event-driven systems ...

Zobility

Be Seen First

Software Coding Engineer (Python / Java)

Raymond, OH · On-site

Proficient in programming languages such as Java, Python , and C++ , with the ability to apply them ... Experienced in both front-end and back-end development, with a solid understanding of full-stack ...

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How much do freelance java backend developer jobs pay per hour?

As of May 30, 2026, the average hourly pay for freelance java backend developer in Columbus, OH is $52.77, according to ZipRecruiter salary data. Most workers in this role earn between $46.92 and $60.82 per hour, depending on experience, location, and employer.
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Freelance AI Agent Engineer (Remote)

Freelance AI Agent Engineer (Remote)

Outlier AI

Columbus, OH • Remote

Full-time

This job post has expired 1 day ago. Applications are no longer accepted.

Job description

About the Project

Outlier helps the world’s most innovative companies improve their AI agents by providing human feedback. Do you want to shape the future of autonomous agents like OpenClaw?

We collaborate with leading AI organizations to train Large Language Models (LLMs) to function as proactive, multi-step agents. Our projects focus on teaching these systems how to design, coordinate, and optimize complex, real-world architectural workflows.

Whether you are a passionate orchestration guru or experienced software developer — we want you to help us train the world's most advanced generative systems.

Ideal Qualifications

  • 2+ years of experience in backend engineering, AI automation, or complex systems integration.
  • Proven ability to build and maintain production-grade software with modular separation (e.g., distinct services for data parsing, logic processing, and reporting).
  • Strong command of at least two major languages (e.g., Python, JavaScript, Go, or Java) and experience working with SQL databases.
  • Practical experience building for live, non-mocked environments and handling multi-turn system interactions.
  • Outstanding attention to detail and the ability to provide clear, high-density technical feedback on complex system behaviors.

Nice to have

  • Expertise building multi-stage coordination tasks where data acquisition leads to reasoned output.
  • Hands-on experience integrating agents with live tools such as Supabase, Gmail, and various APIs to solve real-world problems.
  • High level of comfort implementing persistent state and session discovery using MEMORY.md to track agent progress.
  • Experience identifying subtle failures like privacy leaks, authority escalation, or indirect prompt injections.

Apply