ZipRecruiter

Log In

1

Senior Java Software Developer Jobs in O Fallon, MO

TriOptus LLC

Java Developer

Lake Saint Louis, MO · On-site

$48.25 - $62.50/hr

Develop high quality, secure, scalable software solutions based on technical requirements ... Follow MasterCard Quality Assurance and Quality Control processes. * Assist Senior Team members in ...

MasterCard

Senior Software Engineer

O Fallon, MO

$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.

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

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

Title and Summary Senior Software Engineer Who is Mastercard? Mastercard is a global technology ... Proven experience with backend development with JAVA required Familiarity with Spring Boot ...

The Timberline Group

Lead Software Developer

Saint Louis, MO · On-site +1

$112K - $141K/yr

The individual in this role is a senior member of the IT team who is able to understand the use of ... Software Engineering role. * 6+ years of programming experience in C# .NET. * Past experience ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

Strong proficiency in Java and Spring Boot framework development. Experience designing and ... Experience with DevOps practices and tools including Jenkins, Docker, Kubernetes, CI/CD pipelines ...

Palnar

Sr. Java Full Stack Developer

O Fallon, MO · On-site

$49 - $63.25/hr

What are your top 3 required technical skills We are looking for a developer who is strong in backend development and has basic skills to perform UI development Backend Skills Java 17 Spring Boot 3.x ...

Artius Solutions

Lead Java Engineer

Saint Louis, MO · On-site

$140K - $150K/yr

Familiar with CI/CD tools and pipelines (DevOps mindset), application lifecycle management tools (e ... Experience delivering high-quality software in regulated or large-scale enterprise domains.

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

... using Java, Spring Boot, and microservices architecture. • Deploy, manage, and optimize ... with DevOps practices and tools including Jenkins, Docker, Kubernetes, CI/CD pipelines, and ...

Atria Group LLC

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

Company Description We specialize in Staffing, Consulting, Software Development, and Training along ... Required Skills: 5+ years advanced computer programming skills in Java, Java Servlet, Javabean, EJB ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

Title and Summary Senior Software Engineer Who is Mastercard? We work to connect and power an ... This role is hands-on and requires deep expertise in Java and Spring-based platforms, strong ...

bioMerieux

Sr. Software Engineer

Hazelwood, MO

$115K - $152K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and ... experience, including Java and modern web development frameworks such as Angular Suite.

bioMérieux

Sr. Software Engineer

Hazelwood, MO · On-site

$115K - $152K/yr

The Senior Software Engineer works within established architectural frameworks, enhances CI/CD and ... experience, including Java and modern web development frameworks such as Angular Suite.

next page

Showing results 1-20

All JobsJava Software Developer JobsSenior Java Software Developer JobsSenior Java Software Developer Jobs in O'Fallon, MO

Senior Java Software Developer information

See O Fallon, MO salary details

$10

$58

$80

How much do senior java software developer jobs pay per hour?

As of Jul 18, 2026, the average hourly pay for senior java software developer in O'Fallon, MO is $58.75, according to ZipRecruiter salary data. Most workers in this role earn between $51.49 and $65.62 per hour, depending on experience, location, and employer.

What is a Senior Java Software Developer?

A Senior Java Software Developer is an experienced professional responsible for designing, developing, and maintaining complex software applications using the Java programming language. They typically lead development teams, mentor junior developers, and contribute to architectural decisions. Senior Java Developers are expected to have a deep understanding of Java frameworks, best coding practices, and software development methodologies. They also collaborate with stakeholders to deliver robust, scalable, and efficient software solutions.

What are some common challenges Senior Java Software Developers face when leading projects, and how can they effectively address them?

Senior Java Software Developers often encounter challenges such as balancing hands-on coding with mentoring junior team members, managing project timelines, and ensuring code quality across large, distributed systems. To address these, it’s crucial to establish clear communication channels, implement robust code review processes, and leverage agile methodologies for project management. Additionally, staying up-to-date with the latest Java frameworks and best practices helps in making informed architectural decisions and streamlining development workflows.

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

To thrive as a Senior Java Software Developer, you need advanced proficiency in Java programming, strong knowledge of software design patterns, and experience with frameworks like Spring, typically backed by a bachelor's degree in computer science or a related field. Familiarity with tools such as Git, Maven, Jenkins, and cloud platforms, along with relevant certifications like Oracle Certified Professional Java SE, is often required. Strong problem-solving abilities, effective communication, and leadership skills help in mentoring teams and collaborating on complex projects. These skills ensure the delivery of robust, scalable software solutions and foster innovation within development teams.

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

AspectSenior Java Software DeveloperJava Software Engineer
Required CredentialsBachelor's degree in Computer Science or related field; extensive Java experience; certifications like Oracle Java CertificationBachelor's degree in Computer Science or related field; Java programming skills; certifications are common but not mandatory
Work EnvironmentDevelops complex applications, mentors junior staff, leads projectsDesigns and develops Java applications, collaborates with teams, implements features
Employer & Industry UsageUsed across tech companies, finance, healthcare, and enterprise sectorsCommon in software development firms, IT departments, and tech startups

The main difference between a Senior Java Software Developer and a Java Software Engineer lies in experience level and responsibilities. Senior developers often lead projects and mentor others, while Java Software Engineers focus on designing and implementing Java applications. Both roles require strong Java skills and similar educational backgrounds, but seniority involves additional leadership and project management duties.

What cities near O'Fallon, MO are hiring for Senior Java Software Developer jobs? Cities near O'Fallon, MO with the most Senior Java Software Developer job openings:
Senior Java Software Developer jobs near you
Infographic showing various Senior Java Software Developer job openings in O'Fallon, MO as of July 2026, with employment types broken down into 85% Full Time, 3% Part Time, 1% Temporary, and 11% Contract. Highlights an 82% Physical, 3% Hybrid, and 15% Remote job distribution, with an average salary of $122,196 per year, or $58.7 per hour.
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.

Apply