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Senior Java Software Developer Jobs in O Fallon, MO

Zentek Infosoft Inc.

Java Engineer

O Fallon, MO · On-site

$48.50 - $66.50/hr

Modern Software Design Principles: Deep understanding of design principles like SOLID, DRY (Don't ... This person would fit well into a senior or lead developer role, where they can leverage their deep ...

Futran Tech Solutions Pvt. Ltd.

Java engineer

O Fallon, MO · On-site

$60/hr

... Software Design Principles: Deep understanding of design principles like SOLID, DRY (Don't Repeat ... This person would fit well into a senior or lead developer role, where they can leverage their deep ...

TriOptus LLC

Sr Software Engineer

Lake Saint Louis, MO · On-site

$116K - $153K/yr

Job Title: Sr. Software Developer Location: St. Louis, MO Relevant Experience Needed: 8+ years Contract Duration: 12+ months Experience Summary: * Strong Experience in Core Java , Spring and Web ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

The position requires strong expertise in Java-based application development, Spring Boot, Kafka ... CI/CD pipelines and DevOps engineering practices. • Knowledge of observability tooling ...

MasterCard

Senior Software Engineer

O Fallon, MO

$114K - $151K/yr

The position requires strong expertise in Java-based application development, Spring Boot, Kafka ... Experience with CI/CD pipelines and DevOps engineering practices. Knowledge of observability ...

Zeforge LLC

AI Data Engineer with Java and React

O Fallon, MO · On-site

$48.50 - $66.50/hr

Must-Have Skills * 10+ years of Software Development experience. * Strong Lead Developer experience. * Expertise in *Java* and REST API development. * Strong hands-on experience with *Angular* and

New

Apex Informatics

Java Developer

Saint Louis, MO · On-site

$49.50 - $64.25/hr

St Louis, MO * 10+ years of hands-on software engineering experience * Excellent hands-on experience in Java * Experience in developing REST services. * Experience in unit test frameworks. * Ability ...

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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 17, 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.

Sr. Java with Cobal/Mainframe experience(St. Louis City in Missouri) Hybrid and Day 1 Onsite

TestingXperts Inc. DBA Damcosoft

Saint Louis, MO • On-site

$47.75 - $61.25/hr

Contractor

Re-posted 16 days ago

Job description

Position Title

Sr. Java Engineer with Cobol/Mainframe

Domain EXP

(Banking Domain)

Location

St. Louis, MO (3 days hybrid at Client office)

Duration

6 Months

Must Have   

Java with COBOL and Mainframe requirement.

Job Description

The File Transfer Services team is looking for a Lead Software Engineer to drive our customer connectivity strategy forward by consistently innovating and problem-solving. The ideal candidate is passionate about the customer experience, highly motivated, intellectually curious, analytical, and possesses an entrepreneurial mindset.

In this key position, you will:

  • Design and develop high-performing Java and running on Linux. Ability to work on COBOL and mainframe (z/OS)  technologies is a plus.
  • Ensure scalability, security, and reliability of applications on Linux-based and mainframe-based infrastructures.
  • Translate complex technical solutions into business impacts for non-technical audiences.
  • Lead mainframe modernization efforts, bridging legacy COBOL, JCL, DB2 systems with Linux and Java applications.
  • Guide development teams in Agile best practices, ensuring consistent delivery and continuous improvement.
  • Provide technical leadership in software development, system architecture, and best coding practices.
  • Conduct design reviews, code reviews, and uphold coding standards.
  • Mentor and coach engineering teams, fostering a culture of technical excellence.
  • Collaborate with stakeholders to understand business requirements and translate them into technical solutions.
  • Present technical strategies, incident reports, and status updates to executive leadership and senior stakeholders.
  • Work closely with DevOps to automate deployments, and with BizOps to troubleshoot and resolve application, performance, and reliability issues.
  • Function as Scrum Master, facilitating daily stand-ups, sprint planning, retrospectives, and backlog grooming.
  • Stay up to date with emerging technologies.

The ideal candidate for this position should possess:

  • 8+ years of software development experience in Java/Linux with strong shell scripting and Linux command line skills. Experience working on Mainframe technologies is  a plus.
  • 3+ years of experience with file transfer applications like Connect Direct, and file transfer protocols like SFTP, FTPS, etc..
  • 3+ years of experience writing, optimizing, and automating tasks using Linux shell scripting.
  • Hands-on experience with IBM mainframe technologies, including COBOL, JCL, DB2, VSAM, CICS, and z/OS.
  • Expert in SQL queries and relational databases (DB2, Oracle, PostgreSQL)
  • Familiar with secure coding standards (e.g., OWASP, CWE, SEI CERT) and vulnerability management.
  • Awareness of security standards and RFC’s such as X.509 Certificates, SSH Keys, PGP encryption.
  • Has skills to orchestrate release workflows and pipelines and apply standardized pipelines via APIs to achieve CI and CD objectives using industry standard tools (e.g., Jenkins, XL Release, others).
  • Understands how to build robust tests to minimize defect leakage by performing regression, performance, deployment verification, and release testing.
  • Experience working as technical lead and/or Scrum Master.
  • Good knowledge of Scaled Agile Framework (SAFe).