Intern Java Backend Developer Jobs in Overland, MO

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build asustainableeconomy where everyone can prosper. We support a wide range of digital payments choices, making transactionssecure, 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

Senior Software Engineer - JavaOverview:
Mastercard's Enterprise Credit Risk (ECR) team is seeking a talented Senior Software Engineer - Java Full Stack to design, build, and modernize applications that power credit decisioning, portfolio risk management, lender workflows, customer experiences, and analytics across Mastercard's lending and risk ecosystem.
This role is ideal for an experienced software engineer who enjoys solving complex business problems through technology and working across the full application stack. The successful candidate will partner closely with Product, Engineering, Risk, Architecture, and Data teams to deliver secure, scalable, and high-performing applications that improve operational efficiency, simplify lending decisions, and create exceptional user experiences.
The ideal candidate brings strong hands-on Java backend expertise combined with modern frontend development experience, a passion for engineering excellence, and the ability to contribute to technical design and delivery across the application lifecycle.
This is a hybrid role based in O'Fallon, MO, requiring three days per week onsite.
Role:
Design, develop, test, deploy, and maintain scalable full-stack applications supporting Enterprise Credit Risk products and services.
Build secure, resilient, and highly available backend services using Java, Spring Boot, and Spring Framework.
Develop modern, responsive user interfaces using React, Angular, TypeScript, JavaScript, or similar technologies.
Design and implement RESTful APIs, microservices, and event-driven integrations to enable scalable application architectures.
Collaborate with Product Managers, Business Analysts, Risk SMEs, Architects, and Data teams to translate business needs into effective technical solutions.
Participate in architecture and technical design discussions, evaluating technologies and recommending solutions that improve application capabilities and maintainability.
Develop reusable services, components, and frameworks that promote engineering consistency, scalability, and developer productivity.
Apply strong software engineering practices, including object-oriented design, design patterns, automated testing, code reviews, and secure coding standards.
Diagnose and resolve complex application and production issues, performing root cause analysis and implementing sustainable solutions.
Continuously improve application performance, scalability, reliability, observability, and security.
Contribute to cloud-native development, containerization, and CI/CD and DevSecOps practices that enable reliable and efficient software delivery.
Mentor junior and mid-level engineers, share technical knowledge, and contribute to a culture of engineering excellence.
Participate in Agile planning, estimation, prioritization, and delivery activities while taking ownership of assigned technical outcomes.
All About You:
Extensive experience as a Software Engineer, Senior Software Engineer, Full-Stack Engineer, or similar role developing enterprise-scale applications.
Strong hands-on experience with Java and modern Java development practices, with a deep understanding of object-oriented programming, design principles, and software design patterns.
Proven experience building RESTful APIs, microservices, and distributed applications using Spring Boot and the Spring Framework.
Experience developing modern, responsive web applications using React, Angular, TypeScript, JavaScript, or comparable frontend technologies.
Strong experience working with relational databases and SQL, including technologies such as PostgreSQL, Oracle, or SQL Server.
Experience designing and integrating applications using event-driven architectures, messaging platforms such as Kafka, and JSON/XML-based APIs.
Experience with cloud-native application development, Docker, Kubernetes, and cloud platforms such as Azure or AWS.
Strong understanding of software quality practices, including automated testing, code reviews, CI/CD, source control, and secure software development.
Demonstrated ability to troubleshoot complex technical issues, analyze system behavior, and optimize application performance and scalability.
Demonstrated technical leadership through complex projects, platform initiatives, architectural improvements, or cross-team engineering efforts.
Strong analytical and problem-solving skills, with the ability to navigate ambiguity, evaluate tradeoffs, and drive solutions from concept through delivery.
Excellent written and verbal communication skills, with the ability to explain technical concepts and collaborate effectively with both technical and non-technical stakeholders.
Bachelor's degree in Computer Science, Engineering, Information Systems, or a related STEM discipline. Equivalent practical experience will also be considered.
Preferred Qualifications:
Strong experience with several of the following:
oBackend: Spring Boot / Spring Framework, REST APIs, Microservices, JPA / Hibernate
oFrontend: React, Angular, TypeScript, JavaScript, HTML5 / CSS3
oData & Integration: SQL, PostgreSQL / Oracle, Kafka, JSON / XML APIs
oCloud, DevOps & Engineering: Azure or AWS, Docker, Kubernetes, GitHub, CI/CD pipelines, Automated testing frameworksMastercard 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 reasonable_accommodation@mastercard.com 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: $115,000 - $184,000 USD