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Freelance Java Backend Developer Jobs in Saint Louis, MO

Leidos

Mid-Level Backend Software Engineer

Roxana, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Leidos

Mid-Level Backend Software Engineer

Hartford, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Leidos

Mid-Level Backend Software Engineer

Madison, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

Leidos

Mid-Level Backend Software Engineer

Columbia, IL

$87K - $157K/yr

Design, develop, test, and maintain backend application components using Java or Python * REST API ... Object-Oriented Programming: Apply object-oriented design principles to build scalable and ...

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Freelance Java Backend Developer information

See Saint Louis, MO salary details

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$53

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

As of Jun 13, 2026, the average hourly pay for freelance java backend developer in Saint Louis, MO is $53.11, according to ZipRecruiter salary data. Most workers in this role earn between $47.21 and $61.25 per hour, depending on experience, location, and employer.
Freelance Java Backend Developer jobs near you

Back End Software Engineer (Top Secret Cleared)

Latitude Inc

Saint Louis, MO • On-site

$140K - $200K/yr

Full-time

Posted 9 days ago

Job description

Position Overview:

We are seeking a talented Back End Software Engineer to design, develop, and maintain scalable, secure, and high-performance server-side applications. The ideal candidate will have strong proficiency in Python and experience working with C# or Java, enabling effective collaboration across diverse projects and technology stacks. This role involves working closely with front-end developers, DevOps engineers, and product teams to deliver efficient and reliable software solutions.

Active Top Secret clearance or higher is required
Responsibilities:
  • Design, build, and maintain robust, scalable, and efficient back-end systems and APIs.
  • Develop new features and enhance existing services using Python and C# or Java.
  • Collaborate with cross-functional teams to define, design, and ship new features.
  • Optimize applications for maximum performance, reliability, and scalability.
  • Implement and maintain database schemas, queries, and data models (SQL and NoSQL).
  • Ensure code quality through peer reviews, automated testing, and CI/CD practices.
  • Write clear, maintainable, and well-documented code.
  • Participate in architectural design discussions and technical decision-making.
  • Troubleshoot, debug, and resolve production issues in a timely manner.
$140,000 - $200,000 a year
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