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# Software Engineer II

- **Company:** Mastercard
- **Location:** O'Fallon, MO, United States
- **Salary:** $92,000.0 - $147,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Agile Methodology, Automation of Tests, Unit Testing, Code Review, Cyber Security, Software Maintenance, Service Development Studio, Software Engineering, Product Software Implementation Methods, Information Technology, Software Version Control, Programming Languages
- **Published:** August 1, 2026
- **Apply:** https://www.careerboard.com/us/en/find-jobs-in-United-States/-F360606997397EEEA5/

## About the Role

Bachelor's degree in computer science, Engineering, Information Technology, or equivalent experience
Foundational knowledge of software engineering concepts and the software development lifecycle
Experience with one or more programming languages (Java is a must)
Familiarity with Agile development practices, testing concepts, and version control
Strong analytical, problem-solving, and communication skills
Ability to work effectively in a collaborative, team-based environment
Willingness to learn new technologies and tools

## Description

A Software Engineer II is an early-career or entry-level engineer who contributes to the design, development, testing, and maintenance of software solutions under the guidance of more senior engineers. This role is ideal for individuals who have a strong foundation in software development fundamentals and are eager to grow their technical skills while delivering value to real-world systems.

Software Engineer II roles follow clearly defined guidelines and focus on building core engineering skills, understanding enterprise systems, and learning Mastercard's engineering standards and processes.

Role
The role provides foundational exposure to secure, scalable service development, encryption technologies, and enterprise engineering standards. Working within Agile delivery teams, the Software Engineer II collaborates with experienced engineers to help deliver high-quality, reliable, and security-critical software components.
Contribute to the design, development, testing, and implementation of software solutions under guidance from senior engineers
Develop and maintain application code in accordance with established engineering, quality, and security standards
Create and execute unit tests and support automated testing efforts
Participate in code reviews and incorporate feedback
Assist with troubleshooting, defect resolution, and application support
Collaborate with cross-functional teams to deliver assigned work on schedule
Adhere to audit, compliance, and information security requirements, 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.


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