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Freelance Java Backend Developer Jobs in Philadelphia, PA

YO AI Labs

Backend Developer - Remote

Philadelphia, PA · Remote

$80 - $120/hr

Senior Software Engineer Job Type: Contractor (~15 hours/week) Location: Remote Job Summary We are ... Strong proficiency in Python 3, Java, Rust, C++, or TypeScript . * Strong understanding of ...

SmartIPlace

Staff Engineer - SN

Blue Bell, PA · On-site

The Staff Engineer I (Java) provides senior technical leadership for backend Java development supporting the Workflow Orchestration Initiative, delivering scalable and secure services that enable ...

SmartIPlace

Staff Engineer - SN

Blue Bell, PA · On-site

Blue Bell, PA Requirement The Staff Engineer I (Java) provides senior technical leadership for backend Java development supporting the Workflow Orchestration Initiative, delivering scalable and ...

Prophecy Technologies

Java Developer

Wilmington, DE · On-site

$49.50 - $64/hr

Job Summary JPMorgan Chase is seeking an experienced Java Full Stack Developer with strong ... Create Python scripts and applications for automation, data processing, and backend services.

Prophecy Technologies

Java Developer

Mount Laurel, NJ · On-site

$50.50 - $65.25/hr

Role Descriptions: "Good knowledge on programming languages like Java| PythonDevelop scalable backend services using Python| FastAPI| and Flask.Design| develop| and deploy Machine Learning and Deep ...

RIT Solutions, Inc.

API/Backend Engineer

Malvern, PA · On-site

... DevOps model. • Contribute to the ongoing modernization of legacy components across various ... Required : • Expert proficiency in Java and Spring Boot for API development. • Extensive, hands ...

RIT Solutions, Inc.

API Backend Engineer

Malvern, PA · On-site

... DevOps model. • Contribute to the ongoing modernization of legacy components across various ... Required : • Expert proficiency in Java and Spring Boot for API development. • Extensive, hands ...

Judge Group, Inc.

FullStack Java Developer

Wilmington, DE · On-site

$51 - $65.75/hr

About the Role We are seeking a Full Stack Java Developer with strong backend expertise and hands-on frontend development experience to help design, build, and maintain scalable enterprise ...

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

As of Sep 8, 2026, the average hourly pay for freelance java backend developer in Philadelphia, PA is $55.13, according to ZipRecruiter salary data. Most workers in this role earn between $48.99 and $63.56 per hour, depending on experience, location, and employer.

What are the most commonly searched types of Java Backend Developer jobs in Philadelphia, PA?

The most popular types of Java Backend Developer jobs in Philadelphia, PA are:

What cities near Philadelphia, PA are hiring for Freelance Java Backend Developer jobs?

Cities near Philadelphia, PA with the most Freelance Java Backend Developer job openings:

Freelance Java Backend Developer jobs near you

Backend Developer - Remote

Philadelphia, PA • Remote

YO AI Labs
See more jobs at YO AI Labsexternal

$80 - $120/hr

Full-time

Posted 13 days ago

Job description

Senior Software Engineer

Job Type: Contractor (~15 hours/week)
Location: Remote

Job Summary

We are seeking experienced Senior Software Engineers to support an AI training project by creating reinforcement learning environments that evaluate AI models on complex software engineering tasks using Model Context Protocol (MCP) tools.

You will design reproducible environments, deterministic verification, and reference solutions for tasks such as bug fixing, feature implementation, codebase refactoring, and performance optimization. No prior AI experience is required.

Key Responsibilities
  • Create reinforcement learning environments for software engineering tasks.
  • Design tasks involving bug fixing, feature development, refactoring, and performance optimization.
  • Build deterministic verification systems and golden reference solutions.
  • Evaluate AI agents' ability to reason through complex codebases and use MCP tools effectively.
  • Develop realistic, reproducible software engineering scenarios.
  • Ensure tasks accurately measure coding ability, problem-solving, and tool usage.
  • Document solutions and provide clear technical feedback.
Required Skills
  • Strong proficiency in Python 3, Java, Rust, C++, or TypeScript.
  • Strong understanding of algorithms and data structures.
  • Experience with bug fixing and debugging complex software issues.
  • Proven experience in feature implementation and codebase refactoring.
  • Strong knowledge of performance optimization and tuning.
  • Excellent written and verbal communication.
  • Strong attention to detail.
Preferred Qualifications
  • Experience working with large-scale or distributed codebases.
  • Familiarity with AI/ML systems is a plus but not required.
  • Experience with rigorous code reviews and software engineering best practices.
  • Experience working effectively in remote or cross-functional teams.
Hiring Process
  1. Submit an application and screening questions.
  2. Complete an AI interview (~30 minutes).
  3. Complete a technical assessment, if required.
  4. Hiring Manager review.
Compensation

Compensation is output-based, with payment provided per task that meets project specifications. Minimum weekly submission requirements may apply.

Availability

Selected experts should be prepared to begin their first tasks within 24–48 hours of completing onboarding.