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Freelance Java Spring Developer Jobs in Missouri

Apex Informatics

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Title: Java Developer Location: St Louis, MO * 10+ years of hands-on software engineering ... Experience with Java, ElasticSearch, Kubernetes, Spring, Spring Boot, * Experience developing e ...

Global Soft Systems

Sr. Java Developer

Saint Louis, MO · On-site

$54.25 - $69.25/hr

Sr. Java Developer St. Louis, MO Summary: The Client's Web Development Team is looking for a senior ... Multi-year experience with Spring, especially Spring JPA and Spring Security, and Hibernate is a ...

The Timberline Group

Java Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

Strong understanding of Object Oriented Programming * Analyze and develop Java solutions based on ... Experience with MVC Frameworks Spring MVC, Hibernate, Spring, * REST & Web Services * Experience ...

Gemini

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

Java Developer Location: St.Louis, MO - Inperson Interview Job Type: Full Time Only OPT EAD, CPT ... Spring, Spring Boot Knowledge of ORM framework such as Hibernate Should have worked with Maven ...

Gemini

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Java Developer Location: St.Louis, MO - Inperson Interview Job Type: Full Time Only OPT EAD, CPT ... Spring Boot • Knowledge of ORM framework such as Hibernate • Should have worked with Maven ...

Jobsbridge

Sr. Java Developer

Saint Louis, MO · On-site

$55.75 - $71/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers ... Spring Security will be added advantage. (optional). Experience building software in a continuous ...

Jobsbridge

Sr. Java Developer

Saint Louis, MO · On-site

$55.75 - $71/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers ... Spring Security will be added advantage. (optional). Experience building software in a continuous ...

Jobsbridge

Sr. Java Developer

Saint Louis, MO · On-site

$55.75 - $71/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers ... Spring Security will be added advantage. (optional). Experience building software in a continuous ...

The Timberline Group

Java/J2EE Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

... activities to design JAVA applications. 2. Perform software analysis, programming, testing ... Spring 5. REST Web Services 6. Oracle Database Systems 7. SQL development and operations The ...

Apex Systems

Senior Software Developer I - Contractor

Saint Louis, MO · On-site

$51.75 - $68.25/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

AWS, Java (Spring Boot), Angular, TypeScript, Microservices We're seeking a Senior Software Engineer to support the ongoing modernization of a complex, cloud-based enterprise platform. This role is ...

kollasoft

Java/J2EE developer Sr.

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Java J2EE Developer in St.Louis,MO Duration: 2-3 Years Contract Need GC or USC only Communication ... Expert in open source frameworks (Hibernate, Spring). * Experience with MyFaces, Trinidad, Spring ...

kollasoft

Java/J2EE developer Sr.

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Java J2EE Developer in St.Louis,MO Duration: 2-3 Years Contract Need GC or USC only Communication ... Expert in open source frameworks (Hibernate, Spring). * Experience with MyFaces, Trinidad, Spring ...

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Freelance Java Spring Developer information

What is a freelance Java Spring developer?

A Freelance Java Spring Developer is a self-employed software professional who specializes in building, maintaining, and optimizing applications using the Java programming language and the Spring framework. These developers work on a contract or project basis for various clients, rather than as full-time employees for a single company. Their responsibilities often include designing backend systems, integrating APIs, and ensuring applications are scalable and secure. Freelance Java Spring Developers typically manage their own schedules and may work remotely for clients around the world.

What are the key skills and qualifications needed to thrive as a freelance Java Spring developer?

To thrive as a Freelance Java Spring Developer, you need a solid understanding of Java programming, Spring Framework (including Spring Boot), and experience with RESTful APIs, typically supported by a degree in computer science or relevant certifications. Familiarity with tools like Maven, Git, Docker, and cloud platforms such as AWS or Azure is often required. Strong problem-solving, time management, and client communication skills help you stand out in this role. These competencies ensure you can deliver robust solutions efficiently while managing multiple clients and projects in a dynamic freelance environment.

What are the most common challenges faced by freelance Java Spring developers when working with multiple clients simultaneously?

Freelance Java Spring Developers often juggle projects for multiple clients, which can pose challenges such as managing shifting priorities, aligning with different coding standards, and keeping up with varied communication styles. Successfully navigating these requires strong organizational skills, clear project documentation, and proactive communication to set expectations. Additionally, freelancers must stay updated with the latest Spring framework updates to deliver high-quality, maintainable solutions across diverse client environments.

What is the difference between Freelance Java Spring Developer vs Java Backend Developer?

AspectFreelance Java Spring DeveloperJava Backend Developer
CredentialsOften requires Java certifications, Spring certifications, and relevant experienceTypically requires a Java degree or equivalent experience, with or without certifications
Work EnvironmentIndependent, project-based, remote or on-site freelance workFull-time employment in a company or organization, often in an office setting
Employer & Industry UsageClients across various industries hiring for specific projectsEmployers in tech, finance, e-commerce, and other sectors with ongoing backend needs
Search & Comparison IntentLooking for freelance opportunities or contract work in Java Spring developmentSeeking full-time or permanent backend development roles in Java

In summary, Freelance Java Spring Developers typically work independently on short-term projects, requiring specific certifications and flexible work environments. Java Backend Developers usually hold full-time roles within organizations, focusing on ongoing backend system development.

What are the most commonly searched types of Java Spring Developer jobs in Missouri?

The most popular types of Java Spring Developer jobs in Missouri are:

What are popular job titles related to Freelance Java Spring Developer jobs in Missouri?

For Freelance Java Spring Developer jobs in Missouri, the most frequently searched job titles are:

What job categories do people searching Freelance Java Spring Developer jobs in Missouri look for?

The top searched job categories for Freelance Java Spring Developer jobs in Missouri are:

What cities in Missouri are hiring for Freelance Java Spring Developer jobs?

Cities in Missouri with the most Freelance Java Spring Developer job openings:

Freelance Java Spring Developer jobs near you
Infographic showing various Freelance Java Spring Developer job openings in Missouri as of August 2026, with employment types broken down into 57% Full Time, and 43% Contract. Highlights an 83% In-person, 8% Hybrid, and 9% Remote job distribution.

Application Security Engineer Java / Node.js

The Giant Bullseye

Saint Louis, MO

Contractor

Re-posted 12 days ago

Job description

Overview
Seeking a Java / Node.js Engineer focused on application security remediation, technical debt reduction, and automated vulnerability fixes across multiple platforms. This role partners closely with InfoSec, QA, DevOps, and engineering teams to improve security posture using automation and GenAI-driven solutions.

Key Responsibilities
• Triage and remediate vulnerabilities from SAST, DAST, and SCA tools
• Secure Java, Node.js, Ruby on Rails, and WordPress applications against common OWASP risks
• Patch and upgrade third-party dependencies and harden application configurations
• Validate fixes through regression testing and user flow checks
• Integrate automated security and remediation into CI/CD pipelines
• Build GenAI-assisted remediation workflows using AWS Bedrock or similar tools
• Reduce technical debt, modernize legacy components, and harden cloud, container, and OS environments
• Collaborate with InfoSec and QA teams to close security findings and rescans

Required Skills & Experience
• Strong hands-on experience with Java, Spring Boot, REST APIs, and secure coding
• Proficiency in Node.js, Express.js, JavaScript/TypeScript
• Working knowledge of Ruby on Rails and WordPress security
• Experience with Veracode, Checkmarx, SonarQube, Snyk, or similar tools
• Strong understanding of OWASP vulnerabilities and mitigation techniques
• Experience with OAuth2/JWT, API security, Docker, Kubernetes, Linux, and AWS
• Hands-on experience integrating security into CI/CD pipelines
• Exposure to GenAI tools such as AWS Bedrock or CodeWhisperer

Preferred Qualifications
• Experience with microservices, cloud-native security, and DevSecOps
• Familiarity with OWASP ASVS and threat modeling
• Security certifications (CEH, CSSLP, OSCP) a plus