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Java Software Engineer Jobs in O Fallon, MO (NOW HIRING)

The Giant Bullseye

Senior Java Engineer

Saint Louis, MO

$55.75 - $71/hr

Overview We are looking for a highly skilled Senior Java Engineer to design, develop, and maintain ... quality software solutions * Participate in code reviews, performance optimization, and ...

Equifax, Inc.

Senior Software Engineer

Saint Louis, MO · On-site

$119K - $157K/yr

Bachelor's degree or equivalent experience * 5+ years of software engineering experience * 5+ years experience writing, debugging, and troubleshooting code in mainstream Java, SpringBoot, TypeScript ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology ... Build and own Java services and APIs that deliver AI-powered features, ensuring performance ...

MasterCard

Lead Software Engineer

O Fallon, MO · On-site

Lead software development efforts using Java, Spring Boot, and work with Oracle databases for ... Enhance operability engineering by establishing robust observability, monitoring, and operational ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

We are looking for a Senior AI Java Engineer (Hands-on IC) to deliver AI-driven capabilities across ... This role blends Software Engineering (deterministic systems and reliable services) with AI ...

Mastercard, Inc.

Lead Software Engineer

O Fallon, MO · On-site

All About You Required Qualifications • Proven software engineering experience with a strong focus on backend systems. • Hands-on expertise in: -- Java, Spring Boot -- Oracle (SQL, performance ...

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All JobsJava Software Engineer JobsJava Software Engineer Jobs in O'Fallon, MO

Java Software Engineer information

See O Fallon, MO salary details

$24

$56

$79

How much do java software engineer jobs pay per hour?

As of Jul 9, 2026, the average hourly pay for java software engineer in O'Fallon, MO is $56.52, according to ZipRecruiter salary data. Most workers in this role earn between $46.54 and $63.85 per hour, depending on experience, location, and employer.

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

To thrive as a Java Software Engineer, you need strong programming skills in Java, a solid understanding of object-oriented design, and typically a degree in computer science or a related field. Familiarity with development tools such as Eclipse or IntelliJ IDEA, version control systems like Git, and frameworks such as Spring or Hibernate is often required. Analytical thinking, problem-solving abilities, and effective teamwork distinguish high-performing individuals in this role. These skills ensure the efficient design, development, and maintenance of robust software applications in collaborative and dynamic technical environments.

What Does a Java Software Engineer Do?

A Java software engineer designs and develops computer applications using the Java programming language. In this job, you work with web developers and other software engineers to integrate java software into online platforms or other types of computer software. You are present for the entire development lifecycle, from design through quality testing. Your other duties may include documenting the programming code for other users or developers and writing reports to management or department heads. Java engineers work in large teams, so you must be able to collaborate with many people to complete a project.

Which pays more, C++ or Java?

For a Java Software Engineer, salary differences between C++ and Java roles depend on experience, location, and industry. Generally, C++ positions may offer higher salaries due to their use in performance-critical systems, but Java roles are also well-compensated, especially in enterprise environments. Both skills are valuable, and compensation varies based on specific job requirements and market demand.

What are some typical challenges Java Software Engineers face when working on large-scale enterprise applications?

Java Software Engineers working on large-scale enterprise applications often encounter challenges such as managing complex codebases, ensuring high performance under heavy loads, and maintaining backward compatibility during system upgrades. Collaborating with cross-functional teams, like QA and DevOps, to streamline deployments and resolve integration issues is common. Additionally, keeping up with evolving frameworks and best practices is important for maintaining code quality and system reliability.

What engineer makes $500,000 a year?

A highly experienced senior software engineer, particularly in specialized fields like quantitative finance or at top tech companies, can earn $500,000 or more annually. These roles often require advanced skills, extensive experience, and sometimes stock options or bonuses as part of compensation packages.

What is the difference between Java Software Engineer vs Java Developer?

AspectJava Software EngineerJava Developer
Required CredentialsBachelor's in Computer Science, Java certificationsBachelor's in Computer Science, Java certifications
Work EnvironmentDesigning, developing, and testing Java applicationsWriting, debugging, and maintaining Java code
Employer & Industry UsageTech companies, software firms, enterprise solutionsStartups, software companies, freelance projects
Common Search & ComparisonOften compared for roles involving system design and architectureFocused on coding and implementation tasks

While both roles require similar skills and certifications, Java Software Engineers typically focus on designing and architecting Java applications, whereas Java Developers primarily concentrate on coding and maintaining Java programs. The choice depends on the project scope and career focus.

Are Java engineers in demand?

Java engineers are in high demand due to the widespread use of Java in enterprise applications, Android development, and backend systems. Skilled Java developers with knowledge of frameworks like Spring and experience with cloud environments are particularly sought after in the job market.

What does a Java Software Engineer do?

A Java Software Engineer is responsible for designing, developing, and maintaining software applications using the Java programming language. They work on building efficient, scalable, and robust systems, often collaborating with other developers, testers, and stakeholders. Their tasks can include writing code, debugging, testing, and optimizing Java applications for various platforms, such as web, mobile, or enterprise environments. Java Software Engineers also help ensure that software solutions meet client or business requirements and adhere to industry best practices.

Is Java still useful in 2026?

Java remains a widely used programming language for Java Software Engineers in 2026, especially in enterprise applications, Android development, and backend systems. Its stability, large ecosystem, and ongoing updates ensure continued relevance, and knowledge of Java is valuable for many software development roles.
More about Java Software Engineer jobs
What are popular job titles related to Java Software Engineer jobs in O'Fallon, MO? For Java Software Engineer jobs in O'Fallon, MO, the most frequently searched job titles are:
What job categories do people searching Java Software Engineer jobs in O'Fallon, MO look for? The top searched job categories for Java Software Engineer jobs in O'Fallon, MO are:
What cities near O'Fallon, MO are hiring for Java Software Engineer jobs? Cities near O'Fallon, MO with the most Java Software Engineer job openings:
Java Software Engineer jobs near you
Infographic showing various Java Software Engineer job openings in O'Fallon, MO as of July 2026, with employment types broken down into 100% Full Time. Highlights an 75% In-person, and 25% Remote job distribution, with an average salary of $117,572 per year, or $56.5 per hour.

Junior Software Engineer

Freedom Technology Solutions Group

Saint Louis, MO • Hybrid

Other

Posted 16 days ago

Job description

Freedom Technology Solutions Group is seeking a Software Engineer to support our client's intelligence analysis products and capabilities. This position involves providing software development capabilities to enhance existing and emerging client capabilities, including design and development, modernization of existing applications and services, and operations and sustainment. The role focuses on driving the client's adaptation of higher levels of automation and operational efficiency through agile development methodologies, rapid prototyping, and modern technology stacks. 

The Junior Software Developer applies expertise to multiple development assignments. This role requires originality in developing solutions and provides latitude in designing methodologies and approaches. 

Responsibilities:

  • Design, develop, and enhance backend services using Java, JavaScript, and Python. 
  • Build and maintain secure, automated DevSecOps pipelines for CI/CD.
  • Lead containerized solution deployments across hybrid and cloud (AWS) environments.
  • Implement and optimize geospatial data processing and API integrations.
  • Troubleshoot, debug, and improve system performance.
  • Review code contributions.
  • Contribute to system architecture discussions and recommend improvements.
  • Provide input on deliverables, schedules, and performance metrics.
  • Participate in rapid prototyping to quickly iterate and improve solutions
  • Utilize modern technology stacks to meet client needs
  • Implement CI/CD pipelines using GitLab
  • Collaborate with cross-functional teams to deliver high-quality software solutions 

Key Technologies:

  • Linux
  • Java, JavaScript, Python
  • Containerization (Docker, OpenShift, Kubernetes, ...)
  • AWS Services
  • GitLab
  • Apache Spark, Glue, and other ETL processes/procedures
  • Data Types: Structured and Unstructured, Parquet, JSON, XML, etc. 

Required Qualifications:

  • Active TS/SCI clearance (eligible for CI Poly).
  • 0-3 years software development experience.
  • Proficiency in Java, JavaScript, and Python.
  • Experience with DevSecOps pipelines, Agile methodologies, and CI/CD tools (e.g., GitLab).
  • Hands-on experience with AWS services (Lambda, ECS, S3, RDS, etc.).
  • Skilled in containerization technologies (Docker, Kubernetes, OpenShift).
  • Experience with geospatial data frameworks and APIs (e.g., GeoServer, PostGIS, ArcGIS).
  • Using GitLab for code source repository and using GitLab CI/CD
  • Developing customized code, scripts, modules, macro procedures, or libraries for specialized spatial analysis functions using languages such as Python, Java, JavaScript, PHP, C, C++, C#, Perl, or similar 

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