Top 30 End java Jobs in O'fallon, Mo

Software Engineer II
Mastercard —O'Fallon, MO
- $92,000 - $147,000 a year
- Online Application
- System design
- Mid-level
- AWS
- Paid jury duty
- Health savings account
7d
Software Engineer ||
Mastercard —O'Fallon, MO
- $92,000 - $147,000 a year
- Online Application
- Computer Science
- Mid-level
- Office
- Paid jury duty
- Health savings account
Java Lead Developer (Back End) - Contract to Hire Only
Fabergent —Fenton, MO
- Computer Science
- 5 years
- Bachelor of Science
Quick Apply
Senior Software Engineer
Mastercard —O'Fallon, MO
- $115,000 - $184,000 a year
- Online Application
- Computer science
- Computer Science
- System design
- Paid jury duty
- Health savings account
Senior Data Engineer (Apache Spark, NiFi, SQL)
Mastercard —O'Fallon, MO
- $140,000 - $231,000 a year
- Online Application
- 6 years
- Java
- SQL
- Paid jury duty
- Health savings account
Global Engineering Lead
Cushman & Wakefield —Creve Coeur, MO
- $208,420 - $245,200 a year
- Full-time
- Management
- Computer Science
- Java
- Health savings account
- Disability insurance
Quick Apply
Senior Software Engineer - Java Full Stack Engineer
Mastercard —O'Fallon, MO
- $115,000 - $184,000 a year
- Online Application
- Computer science
- 7 years
- Computer Science
- Paid jury duty
- Health savings account
Software Developer II - Customer Care & Billing Utility Software (Front End)
National Information Solutions Cooperative (NISC) —Lake Saint Louis, MO
- Hybrid work
- Computer science
- Computer Science
- 5 years
- Health savings account
- Paid holidays
13d
SRE/Performance Engineer
World Wide Technology Holding, LLC —St. Louis, MO
- $81,400 - $102,000 a year
- Full-time
- Computer science
- Computer Science
- Bachelor of Science
- Profit sharing
- Wellness program
14h
Software Developer III - Distributed Engineering Workstation (Power Flow Software)
National Information Solutions Cooperative (NISC) —Lake Saint Louis, MO
- Hybrid work
- Computer science
- Computer Science
- Research
- Health savings account
- Paid holidays
13d
Software Developer Fulltime , 40 hours per week
I3GlobalTech —St. Louis, MO
- $122,970 a year
- Full-time
- Computer Science
- Mid-level
- Office
Lead Software Engineer
Mastercard —O'Fallon, MO
- $140,000 - $231,000 a year
- Online Application
- Computer science
- Azure
- Computer Science
- Paid jury duty
- Health savings account
3d
Manager Software Engineering (QA/Automation)
Mastercard —O'Fallon, MO
- $140,000 - $231,000 a year
- Online Application
- Computer science
- Computer Science
- System design
- Paid jury duty
- Health savings account
7d
Lead, Software Engineer (QE)
Mastercard —O'Fallon, MO
- $140,000 - $231,000 a year
- Online Application
- SQL
- Senior level
- Paid jury duty
- Health savings account
Software Engineer, Information Technology
NISA Investment Advisors, LLC —St. Louis, MO
- Full-time
- Computer science
- Computer Science
- Mid-level
- Wellness program
- Health insurance
Director, Site Reliability Engineering
Mastercard —O'Fallon, MO
- $152,000 - $258,000 a year
- Online Application
- Azure
- Computer Science
- Bachelor of Science
- Paid jury duty
- Health savings account
Senior Software Engineer - Java/Spring/Hibernate
Enterprise Mobility —St. Louis, MO
- Full-time
- Computer Science
- Research
- Office
- Profit sharing
- Health insurance

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Software Engineer II

Mastercard -
O'Fallon, MO

Apply Now

Job Details

Full-time
$92,000 - $147,000 a year
7 days ago

Benefits

Paid jury duty
Health savings account
Paid holidays
Disability insurance
Health insurance
Dental insurance
Flexible spending account
Tuition reimbursement
Vision insurance
401(k) matching
Gym membership
Bereavement leave
Life insurance

Qualifications

AI models
Spring Boot
REST Assured
Software engineering
JUnit
Continuous Delivery (CD) implementation
Engineering development testing
Tooling
Cucumber
Improving system uptime or availability
Data structures
C#
IT system monitoring
System performance optimization
System design
Selenium
Vulnerability Remediation
Public Cloud
Mid-level
AI platforms (beyond public GPTs)
Scalable systems
Microservices
Event-driven architecture
Production systems
AWS
Machine intelligence
Bachelor's degree
Quality issues
Splunk
Log analysis tools

Full Job Description

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Software Engineer II

Who is Mastercard?
We work to connect and power an inclusive, digital economy that benefits everyone, everywhere, by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team – one that makes better decisions, drives innovation, and delivers better business results.

About the Role
Software Engineers II at Mastercard design and code artificial intelligence, cloud, and machine learning platforms that provide mission-critical insights to many of the world’s leading organizations and governments. As a Software Engineer, you will develop these products and solutions with speed and agility as part of a small team. This will involve developing high-performing, highly scalable software solutions and products for some of the world’s top brands. Specific tasks vary depending on the project and the business unit that you join in.

Role

Design, build, test, deploy, and maintain scalable applications and microservices
Develop REST APIs using Java and Spring Boot with a focus on performance and reliability
Apply software development, design, and architecture principles to deliver secure and scalable solutions
Contribute to CI/CD pipelines (Jenkins) to improve delivery speed and quality
Own work end-to-end, from design through production support
Write and maintain unit and integration tests; contribute to test automation (JUnit, Selenium, RestAssured, Cucumber)
Improve test coverage and overall software quality
Apply secure coding practices and support vulnerability remediation (CVE remediation, upgrade automation)
Identify and improve performance and scalability issues
Participate in code reviews and follow engineering best practices
Troubleshoot and resolve issues using structured debugging and tools like logging/monitoring (Splunk)
Contribute to system reliability, operability, and monitoring
Collaborate with team members and contribute to technical discussions and knowledge sharing
Leverage AI tools to improve development productivity and ensure outputs are validated for quality and security

All About You

Experience building RESTful services using Java and Spring Boot
Hands-on experience developing and deploying applications (Java, Python, or C#)
Understanding of microservices architecture and CI/CD pipelines
Familiarity with event-driven architecture (Kafka, Axon)
Ability to apply design patterns and structure code for maintainability
Understanding of system design, scalability, and integrations
Experience with unit and integration testing (JUnit or similar)
Experience with test automation tools (Selenium, RestAssured, Cucumber)
Ability to identify and improve performance issues
Knowledge of secure coding practices and vulnerability management
Experience using logging/monitoring tools (Splunk)
Strong understanding of data structures and problem-solving
Experience with code reviews and collaborative development
Ability to troubleshoot and resolve application and system issues
Familiarity with cloud environments (AWS, PCF) is a plus
Bachelor’s degree or equivalent experience

Corporate Security Responsibility
All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

Abide by Mastercard’s security policies and practices;
Ensure the confidentiality and integrity of the information being accessed;
Report any suspected information security violation or breach, and
Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.

Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact [email protected] and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

Abide by Mastercard’s security policies and practices;
Ensure the confidentiality and integrity of the information being accessed;
Report any suspected information security violation or breach, and
Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.

In line with Mastercard’s total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: insurance (including medical, prescription drug, dental, vision, disability, life insurance); flexible spending account and health savings account; paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave); 80 hours of Paid Sick and Safe Time, 25 days of vacation time and 5 personal days, pro-rated based on date of hire; 10 annual paid U.S. observed holidays; 401k with a best-in-class company match; deferred compensation for eligible roles; fitness reimbursement or on-site fitness facilities; eligibility for tuition reimbursement; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.

Pay Ranges

O'Fallon, Missouri: $92,000 - $147,000 USD

Apply Now

Refine Your Search

end java jobs in o'fallon, mo

Software Engineer II

Software Engineer ||

Java Lead Developer (Back End) - Contract to Hire Only

Senior Software Engineer

Senior Data Engineer (Apache Spark, NiFi, SQL)

Global Engineering Lead

Senior Software Engineer - Java Full Stack Engineer

Software Developer II - Customer Care & Billing Utility Software (Front End)

SRE/Performance Engineer

Software Developer III - Distributed Engineering Workstation (Power Flow Software)

Software Developer Fulltime , 40 hours per week

Lead Software Engineer

Manager Software Engineering (QA/Automation)

Lead, Software Engineer (QE)

Software Engineer, Information Technology

Director, Site Reliability Engineering

Senior Software Engineer - Java/Spring/Hibernate

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