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

The Timberline Group

Java/J2EE Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

... JAVA applications. 2. Perform software analysis, programming, testing, debugging based on technical requirements. 3. Identify production and non-production application issues and ensure designs ...

The Timberline Group

Java/Angular Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

The developer will meet with clients, analyze client requirements, propose & construct solutions ... Java/ Angular, J2EE, Servlets, XML * HTML, CSS, JavaScript, JQuery * JUnit, Mockito * Apache ...

Synthesis Systems

Full Stack Java Developer

Creve Coeur, MO · On-site

$49.25 - $63.50/hr

The Full Stack Developer provides frontend and backend development support. The successful ... JS, Java and Postgres SQL on AWS platform Overall 6+ years of Candidate experience needed Good ...

The Timberline Group

Java/Angular Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

The developer will meet with clients, analyze client requirements, propose & construct solutions ... Java/ Angular, J2EE, Servlets, XML * HTML, CSS, JavaScript, JQuery * JUnit, Mockito * Apache ...

The Timberline Group

Java / J2EE 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 ...

The Timberline Group

Java / J2EE Developer

Saint Louis, MO · On-site

$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 ...

Sonsoft Inc

Java/J2ee Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Experience in Server side programming using Java Servlets, JSP, JDBC, JavaBeans, EJB, log4J. * Experience in development/build tools like Eclipse, RAD, Soap UI, XML Spy, ANT, SVN, CVS etc.

Sonsoft Inc

Java/J2EE Developer

Saint Louis, MO

$49.50 - $64.25/hr

Experience in Server side programming using Java Servlets, JSP, JDBC, JavaBeans, EJB, log4J. * Experience in development/build tools like Eclipse, RAD, Soap UI, XML Spy, ANT, SVN, CVS etc.

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: Present ideas assertively, aggressively and not be easily ignored. * Be articulate, persuasive and ...

Sonsoft Inc

Java/J2EE Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Experience in Server side programming using Java Servlets, JSP, JDBC, JavaBeans, EJB, log4J. * Experience in development/build tools like Eclipse, RAD, Soap UI, XML Spy, ANT, SVN, CVS etc.

Sonsoft Inc

Java/J2ee Developer

Saint Louis, MO

$49.50 - $64.25/hr

Experience in Server side programming using Java Servlets, JSP, JDBC, JavaBeans, EJB, log4J. * Experience in development/build tools like Eclipse, RAD, Soap UI, XML Spy, ANT, SVN, CVS etc.

Sonsoft Inc

Java/J2EE Developer

Saint Louis, MO

$49.50 - $64.25/hr

Experience in Server side programming using Java Servlets, JSP, JDBC, JavaBeans, EJB, log4J. * Experience in development/build tools like Eclipse, RAD, Soap UI, XML Spy, ANT, SVN, CVS etc.

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: Present ideas assertively, aggressively and not be easily ignored. * Be articulate, persuasive and ...

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: Present ideas assertively, aggressively and not be easily ignored. * Be articulate, persuasive and ...

Artius Solutions

Lead Java Engineer

Saint Louis, MO · On-site

$140K - $150K/yr

Mentor and support junior engineers; take part in hiring, onboarding, and technical knowledge ... Java 21 preferred): including lambda expressions, Stream API, CompletableFuture, Virtual Threads ...

The Timberline Group

Java / J2EE Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

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

The Timberline Group

Java / J2EE Developer

Saint Louis, MO · On-site +1

$49.50 - $64.25/hr

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

Collabera

Java Developer

O Fallon, MO · On-site

$47.75 - $61.75/hr

Company Description About Collabera: Established in 1991, Collabera is one of the fastest growing end-to-end information technology services and solutions companies globally. As a half a billion ...

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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 Jul 9, 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 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.

Is Java still useful in 2026?

Java remains a widely used programming language for developing enterprise applications, Android apps, and backend systems in 2026. Junior Java Developers can benefit from its stability, extensive libraries, and strong community support, making it a valuable skill in the software industry. Knowledge of frameworks like Spring and tools such as Maven or Gradle enhances job prospects.

What are Junior Java Developers?

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.

Can I learn Java in 3 months?

Junior Java developers can acquire foundational skills in Java within three months with consistent study, practice, and hands-on projects. However, mastering advanced concepts, frameworks, and real-world application typically requires longer experience and ongoing learning.

Which pays more, C++ or Java?

For a Junior Java Developer, salaries for C++ and Java roles can vary based on industry, location, and experience, but generally, C++ positions tend to offer higher starting salaries due to its use in high-performance applications like gaming and finance. However, Java remains widely used in enterprise environments with competitive pay. Both skills are valuable, and salary differences may depend on specific job requirements and demand in the job market.

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 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 are the key skills and qualifications needed to thrive as a Junior Java Developer, and why are they important?

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.

Will AI replace Java devs?

AI is unlikely to fully replace Java developers, as they require problem-solving, design, and understanding of complex systems that AI cannot fully replicate. Instead, AI tools can assist Java developers by automating repetitive tasks and improving productivity, making their roles more efficient. Continuous learning and adapting to new technologies remain important for Java developers to stay relevant in the evolving tech landscape.
More about Junior Java Developer jobs
What are the most commonly searched types of Java Developer jobs in O'Fallon, MO? The most popular types of Java Developer jobs in O'Fallon, MO are:
What are popular job titles related to Junior Java Developer jobs in O'Fallon, MO? For Junior Java Developer jobs in O'Fallon, MO, the most frequently searched job titles are:
What job categories do people searching Junior Java Developer jobs in O'Fallon, MO look for? The top searched job categories for Junior Java Developer jobs in O'Fallon, MO are:
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 July 2026, with employment types broken down into 83% Full Time, 3% Part Time, and 14% Contract. Highlights an 82% In-person, and 18% Remote job distribution, with an average salary of $99,888 per year, or $48 per hour.
Java/J2EE Developer

Java/J2EE Developer

The Timberline Group

Saint Louis, MO • On-site

$49.50 - $64.25/hr

Other

This job post has expired today. Applications are no longer accepted.

Job description

Minimum Requirements:The normal requirements for the offered position are as follows:
Master's degree in Computer Science, Information Science, Electronic or Electrical Engineering or any related field of study, plus three (3) years of experience in the job offered or any related position(s).
1. Oversee software and architectural development activities to design JAVA applications.
2. Perform software analysis, programming, testing, debugging based on technical requirements.
3. Identify production and non-production application issues and ensure designs comply with specifications.
4. Design, develop and modify SQL database systems in Oracle database environment using Java, J2EE, JSP, SQL, XML and HTML technologies and REST Web Services.
5. Work with design and development teams to advance performance and system improvement using proven methodologies and techniques.
6. Coordinate code review and testing and utilize GIT and SVN version control systems for code management.
7. Contribute in all phases of development lifecycle process.
Qualified applicants must also have demonstrable proficiency, skill, experience and knowledge with the following:
1. Java, J2EE, JSP, SQL, XML, HTML
2. GIT, SVN Version Control
3. Linux Platform
4. MVC Frameworks, Spring MVC, Hibernate, Spring
5. REST Web Services
6. Oracle Database Systems
7. SQL development and operations

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