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Java Junior Jobs in Saint Louis, MO (NOW HIRING)

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Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

... Java, Spring Boot, and microservices architecture. Deploy, manage, and optimize applications ... Mentor junior engineers, share technical expertise, and provide guidance on engineering best ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

... junior team members, and performing code reviews. This is a vital role responsible for planning ... JAVA JDK 11-17, Spring Boot, Spring Security, Maven, Hibernate / JPA, REST, and SQL Server or other ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

... junior team members through all phases of the software development lifecycle, and ensuring ... using Java, Spring boot, Kafka, C++, JNI or similar technologies. • BS in Computer Science or ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

... junior team members, and performing code reviews. This is a vital role responsible for planning ... JAVA JDK 11-17, Spring Boot, Spring Security, Maven, Hibernate / JPA, REST, and SQL Server or other ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

... junior engineers • Deliver department and external presentations sharing results with stakeholders All About You • Strong software engineering experience writing applications using Java Spring ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

... using Java and Spring Boot, focusing on performance, scalability, and reliability Translate ... junior engineers and support knowledge sharing across the team Contribute to a culture of ...

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Showing results 21-40

All JobsJava JobsJava Junior JobsJava Junior Jobs in Saint Louis, MO

Java Junior information

See Saint Louis, MO salary details

$59.3K

$103.9K

$156.5K

How much do java junior jobs pay per year?

As of Aug 11, 2026, the average yearly pay for java junior in Saint Louis, MO is $103,858.00, according to ZipRecruiter salary data. Most workers in this role earn between $73,400.00 and $103,500.00 per year, depending on experience, location, and employer.

What is the difference between Java Junior vs Java Developer?

AspectJava JuniorJava Developer
Required Experience0-2 years2+ years
CertificationsOptional, entry-level certificationsOptional, advanced certifications
Work EnvironmentTraining, mentorship-focusedProject-driven, independent
ResponsibilitiesLearning, basic coding tasksDesign, develop, maintain Java applications

Java Junior roles are entry-level positions focused on learning and supporting Java projects, often requiring minimal experience. Java Developers have more experience, handle complex tasks, and contribute to project design and implementation. The transition from Java Junior to Java Developer involves gaining skills, experience, and certifications over time.

What are some typical challenges a Java Junior might face when starting out, and how can they overcome them?

As a Java Junior, you may encounter challenges like understanding complex codebases, adapting to agile development practices, and debugging unfamiliar issues. It's common to feel overwhelmed at first, but asking questions, participating in code reviews, and pairing with more experienced developers can accelerate your learning. Regularly practicing coding, studying documentation, and using collaboration tools will also help you quickly become a productive member of the team.

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

To thrive as a Java Junior, you need a solid understanding of Java programming, object-oriented principles, and a relevant degree or coursework in computer science. Familiarity with development tools like Eclipse or IntelliJ IDEA, version control systems (such as Git), and basic knowledge of databases are typically expected. Strong problem-solving abilities, eagerness to learn, and good communication skills help juniors excel in collaborative and fast-paced environments. These skills enable efficient coding, effective teamwork, and smooth adaptation to evolving project requirements.

Are Java Junior jobs still in demand?

Java Junior jobs remain in demand as Java is widely used in enterprise applications, Android development, and backend systems. Employers seek candidates with foundational Java skills, often complemented by knowledge of frameworks like Spring and basic understanding of version control tools such as Git.

What is a Java Junior?

Java Junior developers are entry-level software engineers who specialize in programming using the Java language. They typically have a foundational understanding of Java syntax, object-oriented programming concepts, and basic software development practices. Java Juniors often assist with coding, debugging, and testing under the supervision of more experienced developers, while continuously learning and building their technical skills. Their responsibilities may also include maintaining existing applications and writing simple features as part of a development team.
What are the most commonly searched types of Java jobs in Saint Louis, MO? The most popular types of Java jobs in Saint Louis, MO are:
Java Junior jobs near you
Infographic showing various Java Junior job openings in Saint Louis, MO as of July 2026, with employment types broken down into 84% Full Time, 7% Part Time, 8% Contract, and 1% Nights. Highlights an 85% Physical, 4% Hybrid, and 11% Remote job distribution, with an average salary of $103,858 per year, or $49.9 per hour.

TEST ENGINEER with Security Clearance

CEdge Software Consultants

Saint Louis, MO • On-site

Other

Re-posted 15 days ago

Job description

CEdge has an opportunity for a Test Systems Engineer (MID), located in St Louis, MO. If you are ready to work alongside World Renowned Technology experts, and carry the skills below, this is the opportunity that will inevitably take your career to unbelievable levels! ***This position requires a TS/SCI Security Clearance*** TO01, Test Systems Engineer Responsibilities Senior-level Test Systems Engineers assist in leading Application, System and Integration Testing teams performing test and evaluation across the National System of Geospatial-intelligence (NSG), Allied System of Geospatial-intelligence (ASG) and Federal Agencies to ensure timely and accurate GEOINT. Duties include: · Guides Mid-level ​and Junior-level system engineers performing test and evaluation across the National System of Geospatial-intelligence (NSG), Allied System of Geospatial-intelligence (ASG) and Federal Agencies. · Performs testing of applications and application programming interfaces (APIs) in DevOps pipelines utilizing quality assurance measures established by the government and industry best practices. · Performs independent integration testing on the system software or hardware to determine the system’s compliance with specified requirements. · Plans and executes manual tests, and automated test scripts using scripting and programming languages. · Supports technical investigations for defects discovered during test activities. Required: · Bachelor’s degree or higher in Engineering, Computer Science, Information Technology, Management Information Systems, or related STEM degree program, or 6 years of experience as a Test Systems Engineer. · 6 years of experience with test management and defect tracking tools. · Experience with three or more of the following; JMeterand, Jenkins, Docker, Postman, Swagger, Nexus, Apigee or GitHub/GitLab (or equivalent software packages), Java, Bash, Curl, XML, JSON, SQL, Python, Javascript, and AWS and C2S. · Experience with traditional, Agile, and DevOps development practices and associated testing strategies. · TS/SCI clearance adjudication or ability to obtain SCI and pass a polygraph. Desired: · Master’s degree in Computer Science, Information Technology, Management Information Systems, or related STEM degree program. · Working knowledge of Model Based Systems Engineering, processes, tools and languages. · Working knowledge of Software Development Frameworks.

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