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

MyASAP

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

... in Java & Unix. Assist production support of applications in PROD and Pre PROD. Conduct unit ... oriented analysis, design, and programming experience and SOLID principles Experience in ...

TriOptus LLC

Senior Software Engineer - Java Developer

MO · On-site

$53.50 - $68.25/hr

... Java Developer) Location: O'fallon, Missouri Duration: 24 months Experiece: 7+ years Skills summary: • Advanced in with Linux and Java development (JDK 1.7 or greater), design patterns, threading ...

MyASAP

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

... in Java & Unix. • Assist production support of applications in PROD and Pre PROD. • Conduct ... and programming experience and SOLID principles • Experience in implementing various design ...

TriOptus LLC

Java Developer - Consultant

Lake Saint Louis, MO · On-site

$48.25 - $62.50/hr

Java Consultant Location: St. Louis, MO Experience: 8+ years Duration: 12+ months Role: * Hands-on developer who writes high quality, secure code that is modular, functional and testable. * Lead the ...

Accenture Federal Services

Java Developer

Saint Louis, MO

$49.50 - $64.25/hr

The Java Developer will be responsible for the following: * Design, develop, and configures software systems to meet market and/or client requirements either end-to-end from analysis, design ...

Auritas

Java Lead Backend Developer

Saint Louis, MO

$120K/hr

* Strong Java developer with very good understanding of micro services * Develop and consume APIs using HTTP/Rest. * Skills on at least one major JS library /frame work. * Exposure to relational/non ...

Jobsbridge

Sr. Java Developer

Saint Louis, MO

$55.75 - $71/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers/architects, we have them all. Core Java (Mandatory) Web Service [REST and SOAP] (Mandatory) Hibernate or ...

Jobsbridge

Sr. Java Developer

Saint Louis, MO

$55.75 - $71/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers/architects, we have them all. Core Java (Mandatory) Web Service [REST and SOAP] (Mandatory) Hibernate or ...

Jobsbridge

Sr. Java Developer

Saint Louis, MO

$55.75 - $71/hr

Be it core Java, full-stack Java, Web/UI designers, Big Data or Cloud or Mobility developers/architects, we have them all. Core Java (Mandatory) Web Service [REST and SOAP] (Mandatory) Hibernate or ...

AG Technologies

JAVA Developer

Chesterfield, MO

$50.50 - $65.25/hr

Expertise with the Eclipse IDE, and related Java build tools and techniques * Familiarity with Oracle and PL/SQL * Good team working skills and meticulous attention to detail Additional Information ...

Xforia, Inc.

Java Developer

Lake Saint Louis, MO · On-site

$48.25 - $62.50/hr

Develop and execute unit and integration tests as per the project plan. * Assist in the setup and execution of demonstrations as required Required Skills: * 5+ years of Angular and Java experience.

Navtech, Inc.

Java Developer with PL/SQL

Lake Saint Louis, MO · On-site

$48.25 - $62.50/hr

Java Developer with PL/SQL Location: St Louis, MO Remote till Covid Duration: 6 to 12 Months Contract * Assist in the development of enterprise systems making specific determinations about system ...

1 point system

Java Developer

O Fallon, MO · On-site

$47.75 - $61.75/hr

The Sr. Software Engineer opportunity we have in St. Louis, MO. All candidates will be required to take a Glider exam , which is on recorded video and may be reviewed by the client , prior to ...

The Timberline Group

Java/J2EE Developer

Saint Louis, MO · On-site +1

$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 ...

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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 Developer with Expertise in MULE

Java Developer with Expertise in MULE

Stem Xpert

Saint Louis, MO • On-site

$49.50 - $64.25/hr

Contractor

Re-posted 9 days ago

Job description

Company Description

  TekWissen LLC

Job Description

Position : Java Developer - Mule
Location : St. Louis, MO
Duration : Long-term
Expertise with:
Java programming
XPath expressions & functions
XSLT
Mule ESB platform to deliver SOAP & REST based APIs (a plus)
Deep understanding of SOA design principles and best practices
Deep understanding and implementation of web services
Coordinate across multiple teams to deliver complex projects successfully
Self-motivated, detail oriented
Excellent verbal and written technical documentation skills

Additional Information

If you are interested for the position kindly send me your resume and the best time to reach you.

You can reach me at  chris at tekwissen dot com  & 734-274-2717 (direct)

stem xpert logo

About stem xpert

Sourced by ZipRecruiter

STEM Xpert, based in Ann Arbor, MI, US, is a leading company in the Science, Technology, Engineering, and Mathematics (STEM) education industry. Since their establishment, they have made an indelible mark by providing innovative services and products designed to enhance STEM learning. Their service portfolio includes comprehensive educational programs, customized learning modules and interactive STEM kits. Driven by a passion for nurturing young minds, the company's mission is to bring about an educational renaissance in the STEM field, making learning not just theoretical but practical and fun. One notable achievement for STEM Xpert has been its success in reaching a broad spectrum of learners, from school-age to adults, contributing significantly towards empowering the community's technological and scientific literacy.

Industry

Recruiting and staffing services

Company size

51 - 200 Employees

Headquarters location

Ann Arbor, MI, US

Year founded

2012

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