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Junior Java Developer Jobs in O Fallon, MO (NOW HIRING)

AG Technologies

Junior JAVA Devloper

Chesterfield, MO · On-site

$300/wk

... engineering, interfacing, integration of hardware and software systems to include an understanding ... Experience in Java development This position requires a TS/SCI clearance with a polygraph.

AG Technologies

Junior JAVA Devloper

Chesterfield, MO · On-site

$300/wk

... engineering, interfacing, integration of hardware and software systems to include an understanding ... Experience in Java development This position requires a TS/SCI clearance with a polygraph.

Apex Informatics

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Java Developer Location: St Louis, MO * 10+ years of hands-on software engineering experience * Excellent hands-on experience in Java * Experience in developing REST services. * Experience in unit ...

ACI Infotech

Java Developer

Lake Saint Louis, MO · On-site

$48.25 - $62.50/hr

Onsite Sr. Java Developer Location: St. Louis, MO In short, I require ::-- Java , spring boot , microservices and AWS ( cloud is compulsory , if not AWS , any other cloud will work). Responsibilities ...

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 Java developer to help create several new capabilities for our customer-facing applications. Our ...

The Timberline Group

Java Developer

Saint Louis, MO · On-site

$171.92/hr

Strong understanding of Object Oriented Programming * Analyze and develop Java solutions based on customers' needs * The ability to develop technical documentation * Proficient knowledge of Java ...

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 customers' needs * The ability to develop technical documentation * Proficient knowledge of Java ...

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 EAD, H4 EAD, L2 EAD, H1B Visa Transfer JOB DETAILS: Below highlighted skills are mandatory. Experience ...

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 EAD, H4 EAD, L2 EAD, H1B Visa Transfer JOB DETAILS: Below highlighted skills are mandatory. • ...

Atria Group LLC

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

Unigroup is in need of a senior Java developer. They will be part of a 10+ person team developing on a large rewrite of their enterprise system along with smaller projects as well. This individual ...

Pyramid IT

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

Java Developer Location - St. Louis, MO Duration: Long term contract Work Authorization status : US Citizen & Green card only Mandatory Skills: J2EE (Java, JSP, Servlets, Filters, Listeners, JSTL, EL ...

Atria Group LLC

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

Required Skills: 5+ years advanced computer programming skills in Java, Java Servlet, Javabean, EJB, OO Design, HTML. Advanced working skills in programming with SQL or Oracle. Experience writing ...

Clearwing

Backend Java Developer

Chesterfield, MO · On-site

$80 - $100/hr

Job Discription Java Programming language - Candidate will have an opportunity to work directly with the users, business analyst, translate business requirements into the technical architecture and ...

New

Gallop Resources Inc

Fullstack Java Developer

Saint Louis, MO · On-site

$51 - $65.75/hr

Ability to thrive in a team-oriented, fast-paced environment Qualifications Fullstack Java Developer Additional Information All your information will be kept confidential according to EEO guidelines.

Gallop Resources Inc

Fullstack Java Developer

Saint Louis, MO · On-site

$51 - $65.75/hr

Ability to thrive in a team-oriented, fast-paced environment Qualifications Fullstack Java Developer Additional Information All your information will be kept confidential according to EEO guidelines.

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All JobsJava Developer JobsJunior Java Developer JobsJunior Java Developer Jobs in O'Fallon, MO

Junior Java Developer information

See O Fallon, MO salary details

$57K

$99.9K

$150.5K

How much do junior java developer jobs pay per year?

As of Aug 19, 2026, the average yearly pay for junior java developer in O'Fallon, MO is $99,888.00, according to ZipRecruiter salary data. Most workers in this role earn between $70,600.00 and $99,600.00 per year, depending on experience, location, and employer.

What is a junior Java developer?

Junior Java Developers are entry-level software engineers who specialize in building and maintaining applications using the Java programming language. They typically work under the supervision of more experienced developers and are responsible for writing code, debugging, and participating in code reviews. Their tasks may also include testing software, learning new frameworks, and assisting with the design and implementation of features. Junior Java Developers usually have foundational knowledge of Java and related technologies, and they are eager to develop their skills through hands-on experience.

What does a junior Java developer do?

Junior Java developers are entry-level programmers who are part of a team of coders and developers. They work on both front-end and back-end codes to build an application. Being a junior Java developer requires extensive knowledge of coding and the program language JavaScript to develop and troubleshoot products. As a junior Java developer, you run tests to pinpoint errors, migrate code and data, and ensure the program is integrated with other company developments.

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

A Junior Java Developer should have a solid understanding of Java programming, object-oriented principles, and basic software development concepts, often supported by a relevant degree or coding bootcamp. Familiarity with tools such as IntelliJ IDEA or Eclipse, version control systems like Git, and frameworks like Spring Boot is typically expected. Strong problem-solving abilities, attention to detail, and effective teamwork are important soft skills in this role. These competencies enable efficient code development, smooth collaboration, and the ability to quickly adapt to new technologies and project requirements.

What are some common challenges a junior Java developer might face during their first year, and how can they overcome them?

Junior Java Developers often encounter challenges such as understanding large codebases, adapting to agile development processes, and managing task priorities. To overcome these hurdles, it’s helpful to proactively seek mentorship from senior developers, regularly review documentation, and participate in code reviews. Effective communication with team members also accelerates learning and helps clarify requirements or technical uncertainties. Embracing continuous learning through online resources and hands-on projects will further strengthen your skills and confidence.

What is the difference between Junior Java Developer vs Java Developer?

AspectJunior Java DeveloperJava Developer
Required Experience0-2 years2+ years
CertificationsOptional, entry-level certificationsOptional, advanced certifications
Work EnvironmentSupportive, learning-focused teamsProject-driven, independent roles
ResponsibilitiesAssist in coding, bug fixing, learning frameworksDesign, develop, maintain Java applications

The main difference between a Junior Java Developer and a Java Developer lies in experience, responsibilities, and independence. Junior Java Developers are typically entry-level, focusing on learning and supporting tasks, while Java Developers have more experience and handle complex development projects independently.

How much do junior Java developers make?

Junior Java developers typically earn between $50,000 and $80,000 annually, depending on location, industry, and experience. Entry-level roles often require knowledge of Java, object-oriented programming, and development tools like Eclipse or IntelliJ IDEA.

Is a Junior Java Developer still in demand?

Junior Java Developers remain in demand due to the widespread use of Java in enterprise applications, web development, and Android app creation. Employers seek candidates with foundational Java skills, knowledge of frameworks like Spring, and familiarity with version control tools such as Git. Continuous learning and certifications can enhance job prospects in this field.
More about Junior Java Developer jobs

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The most popular types of Java Developer jobs in O'Fallon, MO are:

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For Junior Java Developer jobs in O'Fallon, MO, the most frequently searched job titles are:

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What cities near O'Fallon, MO are hiring for Junior Java Developer jobs?

Cities near O'Fallon, MO with the most Junior Java Developer job openings:

Junior Java Developer jobs near you
Infographic showing various Junior Java Developer job openings in O'Fallon, MO as of August 2026, with employment types broken down into 79% Full Time, 8% Part Time, and 13% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $99,888 per year, or $48 per hour.

Core Java Developer

Stellar IT Group

Saint Louis, MO • On-site

Contractor

Posted 2 days ago

New

Job description

Overview:
Position: Core Java Developer
Location: Remote
Duration: 6+ Months Contract
Role Overview
We are seeking experienced Senior Core Java Developers to join our team and contribute to building secure, scalable, and production-ready applications. The ideal candidate will have strong expertise in Java, microservices architecture, and containerization, with hands-on experience in developing REST APIs and implementing secure coding practices. This role requires deep technical proficiency in backend engineering, combined with the ability to collaborate across teams and deliver high-quality solutions in enterprise environments.
Key Responsibilities
  • Design, develop, and maintain Core Java applications with a focus on scalability and performance.
  • Build and integrate microservices architectures using Spring Boot, Spring Security, and Spring Web MVC.
  • Develop and optimize REST APIs for secure and efficient communication between services.
  • Implement secure coding practices to remediate vulnerabilities and ensure compliance with enterprise standards.
  • Work with containerization platforms (Docker, Kubernetes, OpenShift) to deploy and manage applications.
  • Collaborate with cross-functional teams including QA, DevOps, and product owners to deliver production-ready solutions.
  • Conduct code reviews, troubleshoot issues, and provide technical guidance to junior developers.
  • Support CI/CD pipelines and ensure smooth deployment processes.
Required Skills
  • Strong expertise in Core Java development.
  • Hands-on experience with containerization (Docker, Kubernetes, OpenShift).
  • Proficiency in microservices architecture and REST API development.
  • Solid knowledge of Spring Boot, Spring Security, Spring Web MVC.
  • Experience with secure coding practices and vulnerability remediation.
Nice to Have
  • Experience with Harness for CI/CD orchestration.
  • Familiarity with Postman or other API testing tools.
  • Exposure to Red Hat OpenShift for enterprise container management.

Skills:
JAVA,Containerization

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