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

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Java Backend Developer

O Fallon, MO · On-site

$47.25 - $61.25/hr

Design, develop, and maintain backend applications using Java 8 and the Spring Framework. * Build ... CI/CD and DevOps practices. * Unit testing (JUnit or Mockito). * Bachelor's degree in computer ...

Sigmaways Inc

Java Backend Developer

Saint Louis, MO · On-site

$49 - $63.75/hr

Excellent capabilities in Java applications and Object Oriented concepts * Deep functional ... Proficient oral and written communication skillsBS or MS in engineering, com * Hadoop - Nice to ...

MasterCard

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

We are looking for a Senior AI Java Engineer (Hands-on IC) to deliver AI-driven capabilities across our roadmap. This is a builder role requiring strong hands-on engineering-owning critical ...

Mastercard, Inc.

Senior Software Engineer

O Fallon, MO · On-site

$114K - $151K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

We are looking for a Senior AI Java Engineer (Hands-on IC) to deliver AI-driven capabilities across our roadmap. This is a builder role requiring strong hands-on engineering-owning critical ...

CYNET SYSTEMS

Java Full Stack Developer

Saint Louis, MO · On-site

$50/hr

Java/JEE, Spring, Spring boot, REST/SOAP web services, Hibernate, SQL, Tomcat, Application servers (WebSphere), SONAR, Agile, AJAX, Jenkins. * Skills in UML, application designing/architecture ...

The Timberline Group

Java Full Stack Developer

Saint Louis, MO · On-site +1

$51 - $65.75/hr

Full Stack Developer to join the Software Engineering team. This individual will be responsible for ... Java, Scala, etc. and dynamic languages such asnode.js, Python, Groovy • Experience with ...

Arka Infotech Inc

Sr. Scala Developer

Saint Louis, MO

$53 - $70/hr

Louis, Missouri 08-03-2015 Senior Scala Developer w/hands-on experience writing Scala architecture on OS X and AWS models -- experience coding in Clojure, Java, and/or Python also a plus. Client is ...

Apex Systems

Senior Software Developer I - Contractor

Saint Louis, MO · On-site

$51.75 - $68.25/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

AWS, Java (Spring Boot), Angular, TypeScript, Microservices We're seeking a Senior Software Engineer to support the ongoing modernization of a complex, cloud-based enterprise platform. This role is ...

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Senior Java Developer information

See O Fallon, MO salary details

$10

$58

$80

How much do senior java developer jobs pay per hour?

As of Aug 19, 2026, the average hourly pay for senior java 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 developer?

Senior Java Developers are experienced software engineers who specialize in using the Java programming language to design, develop, and maintain complex applications. They typically lead development teams, oversee project architecture, and ensure code quality through best practices. In addition to strong coding skills, they often mentor junior developers and collaborate with stakeholders to deliver robust software solutions. Their expertise is crucial in building scalable, high-performance applications across various industries.

What are the key skills and qualifications needed to thrive as a senior Java developer?

To thrive as a Senior Java Developer, you need advanced proficiency in Java programming, experience with software design patterns, and a strong grasp of backend development, often supported by a degree in computer science or related field. Familiarity with frameworks like Spring, build tools such as Maven or Gradle, and version control systems like Git, as well as knowledge of cloud platforms, is typically required. Excellent problem-solving, leadership, and communication skills help you guide teams and collaborate effectively. These competencies are crucial for delivering robust, scalable software solutions and driving technical success within development teams.

What are some common challenges senior Java developers face when working on large-scale enterprise projects?

Senior Java Developers often encounter challenges such as maintaining code quality across large codebases, managing dependencies between modules, and ensuring optimal application performance. Collaborating with cross-functional teams—including QA, DevOps, and product management—requires clear communication and effective problem-solving. Additionally, staying updated with the latest Java frameworks and best practices is essential for delivering scalable and maintainable solutions in complex enterprise environments.

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

AspectSenior Java DeveloperJava Software Engineer
Required CredentialsBachelor's in CS or related, Java certifications often preferredBachelor's in CS or related, Java certifications beneficial
Work EnvironmentTeam lead roles, project management, mentoringDevelopment-focused, coding, testing, and implementation
Employer & Industry UsageTech companies, finance, e-commerceSoftware firms, startups, enterprise IT
Common Search & ComparisonOften compared for experience level and responsibilitiesSimilar roles with slight variations in scope

The main difference between a Senior Java Developer and a Java Software Engineer lies in their responsibilities and experience. Senior Java Developers typically take on leadership, mentoring, and project management roles, while Java Software Engineers focus more on coding, development, and technical implementation. Both roles require strong Java skills and relevant credentials, but the Senior Java Developer usually has more experience and a broader scope of responsibilities.

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 Senior Java Developer jobs in O'Fallon, MO?

For Senior Java Developer jobs in O'Fallon, MO, the most frequently searched job titles are:

What job categories do people searching Senior Java Developer jobs in O'Fallon, MO look for?

The top searched job categories for Senior Java Developer jobs in O'Fallon, MO are:

What cities near O'Fallon, MO are hiring for Senior Java Developer jobs?

Cities near O'Fallon, MO with the most Senior Java Developer job openings:

Senior Java Developer jobs near you
Infographic showing various Senior Java Developer job openings in O'Fallon, MO as of August 2026, with employment types broken down into 79% Full Time, 8% Part Time, and 13% Contract. Highlights an 80% Physical, 6% Hybrid, and 14% Remote job distribution, with an average salary of $122,196 per year, or $58.7 per hour.

Java Full Stack Engineer

Brains Technology Solution

O Fallon, MO • On-site

$49 - $63.25/hr

Other

Re-posted 21 days ago

Job description

Job Title

Java Full Stack Engineer

Technology

Java, J2EE, Spring Boot

Employment Type

C2H

Level

Senior (L4)

Work Location (City/State)

O'Fallon, MO (Hybrid onsite 3 days/week)

Travel Locations (%)

Must be able to travel to office as needed

JOB DESCRIPTION:

What You Will Do

  • Contribute to the planning, design, and development of microservices on your team.
  • Build Java microservices that work with Angular and third-party applications
  • Deliver code with exceptional quality and security that operates at scale
  • Participate in code reviews and retrospectives, and submit Pull Requests using Git
  • Collaborate with software engineers, test engineers, TPMs, and PMs
  • Ensure that you use 12-factor app design principles in your development.
  • Ensure that the systems you create comply with Client engineering best practices and governance models, including security, operations, and Enterprise Architecture requirements

Skills and Experience Needed

Required:

  • Experience building applications using Java
  • Extensive experience with Java APIs
  • Experience with web technologies, including HTML, JavaScript and front-end frameworks such as Angular
  • Ability to optimize applications for performance, scalability, and reliability.
  • Solid SQL development knowledge (i.e. PostgreSQL, Oracle, etc.) and able to deliver solutions that leverage them at a massive scale
  • Exposure to automated testing and releasing software in a continuous delivery model using Git
  • Experience working in an Agile team focused on continuous improvement
  • Able to learn and leverage best practices and modern software architecture and collaborate within a team
  • Excellent communication skills with both technical and non-technical people

Desired:

  • Experience working within the commercial card space or corporate banking
  • Strong ability to multi-task, organize, manage, and implement complex projects whether directly or through supervision
  • Able to operate with minimal supervision and able to make informed, well-reasoned decisions independently
  • Experience with PCF

Education:

  • Bachelor's degree

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