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

TriOptus LLC

Java Developer

Lake Saint Louis, MO · On-site

$48.25 - $62.50/hr

Java Developer Job Location: Lake St. Louis Duration: 12+ months Mode of Interview: In-person only Primary Skills required: * Hibernate * Java 6 or above * Google Web Toolkit Goo to have skills:

TriOptus LLC

Java Developer

Lake Saint Louis, MO

$48.25 - $62.50/hr

Java Developer Job Location: Lake St. Louis Duration: 12+ months Mode of Interview: In-person only Primary Skills required: * Hibernate * Java 6 or above * Google Web Toolkit Goo to have skills:

The Timberline Group

Java Developer

Saint Louis, MO

$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 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 ...

The Timberline Group Company

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

Strong understanding of object oriented programming * Ability to analyze and develop Java solutions based on customers' needs * The ability to develop technical documentation * Proficient knowledge ...

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 ...

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 ...

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. • ...

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 ...

Georgia IT Inc

Java Developer- St Louis

Saint Louis, MO

$49.50 - $64.25/hr

Position- Java Developer Location- St Louis, MO Duration- Contract Rate- DOE • Strong Java developer with very good understanding of micro services. • Grasp of software engineering skills in ...

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 ...

Georgia IT Inc

Java Developer- St Louis, MO

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Position- Java Developer Location- St Louis, MO Duration- Contract Rate- DOE * Strong Java developer with very good understanding of micro services. * Grasp of software engineering skills in modular ...

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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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 Jun 18, 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.

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.

Is Java outdated in 2026?

Java remains a widely used programming language for junior Java developers in 2026, with ongoing updates and a large ecosystem supporting enterprise applications, Android development, and backend systems. Its stability, extensive libraries, and strong community ensure its relevance, though developers should stay current with new features and frameworks to remain competitive.

Which pays more, C++ or Java?

For a Junior Java Developer, salaries for C++ and Java roles can vary based on location, industry, and experience, but generally, C++ positions tend to offer slightly 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 are often influenced by specific job requirements and demand in the tech 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.

Is AI replacing Java developers?

AI tools can automate certain coding tasks and improve efficiency for Java developers, but they are not replacing the need for human programmers. Java developers are still essential for designing, maintaining, and understanding complex systems, as well as integrating AI technologies into applications. Skills in problem-solving, debugging, and system architecture remain critical in the field.

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.

Is Java developer still in demand?

Java developers remain in high demand due to the language's widespread use in enterprise applications, Android development, and backend systems. Skills in frameworks like Spring and knowledge of cloud environments can enhance job prospects in this field.

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.
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:
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Junior Java Developer jobs near you
Java Developer

Java Developer

TriOptus LLC

Lake Saint Louis, MO • On-site

$48.25 - $62.50/hr

Contractor

Posted 19 days ago

Job description

Job Title: Java Developer
Job Location: Lake St. Louis
Duration: 12+ months
Mode of Interview: In-person only
Primary Skills required:
  • Hibernate
  • Java 6 or above
  • Google Web Toolkit

Goo to have skills:
  • Maven
  • Gradle
  • Spring
  • CI/CD
  • Oracle
  • Linux Shell Scripting

Role Description:
  • Responsible for programming, testing, implementation, documentation, maintenance and support of systems application software in adherence with MasterCard standards, processes and best practices.
  • Develop high quality, secure, scalable software solutions based on technical requirements specifications and design artifacts within expected time and budget.
  • Research, create and evaluate technical solution alternatives for the business needs current and upcoming technologies and frameworks.
  • Perform feasibility studies, logic designs, detailed systems flowcharting, analysis of input-output flow, cost and time analysis.
  • Work with project team to meet scheduled due dates, while identifying emerging issues and recommending solutions for problems and independently perform assigned tasks, perform production incident management. Participate in on-call pager support rotation.
  • Document software programs per Software Development Best Practices. Follow MasterCard Quality Assurance and Quality Control processes.
  • Assist Senior Team members in modification of the documentation templates per the needs of the project and technology.
  • Contribute ideas to help ensure that required standards and processes are in place and actively look for opportunities to enhance standards and improve process efficiency.
  • Support collection and reporting of project and software metrics.

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