Explore 7 java developer jobs from 2 hiring companies in Owensville, MO, US. Filter by remote, salary, experience, and company, then open any listing to apply.

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Our PurposeMastercard powers economies and empowers people in 200&#43; 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<h3></h3>Software Engineer II<h3></h3>Overview: Mastercard’s Decision Management Platform team is seeking a Software Developer II to design, develop, and deliver scalable, secure, and high-quality software solutions. In this role, you will contribute to the full software development lifecycle, from analysis and design to implementation and ongoing support, while collaborating with cross-functional teams to meet evolving business needs. You will play a vital role in a rapidly growing organization, working closely with experienced and driven engineers to solve complex challenges. Engineers work in small, flexible teams, with every member contributing to the design, development, and testing of features. We follow an Agile approach to software development and practice continuous integration and delivery. This is a hybrid position based in O’Fallon, MO requiring three days per week onsite. Role: •	Design, develop, test, implement, and maintain software applications that align with Mastercard engineering standards and best practices. •	Deliver secure, reliable, and scalable software solutions within defined timelines and budgets. •	Research and evaluate alternative technical approaches to meet current and future business needs. •	Conduct feasibility studies, system flowcharting, and logic design to support solution development. •	Collaborate with team members and stakeholders to meet project goals, identify issues early, and recommend practical solutions. •	Independently manage assigned tasks and participate in production incident management and on-call rotations. •	Create and maintain comprehensive technical documentation in line with Mastercard’s quality and governance standards. •	Assist senior engineers in updating documentation and templates to align with evolving project and technology needs. •	Contribute to process improvement initiatives and promote best practices in software development and delivery. •	Support the collection, analysis, and reporting of software and project performance metrics. All About You: •	Proven experience in software engineering, architecture, or development. •	Strong hands-on experience in Java (Java 17 preferred) for developing scalable and high-performance applications. •	Familiarity with CI/CD tools such as Jenkins and Git. •	Working knowledge of cloud platforms (AWS preferred). •	Hands-on experience with containerization technologies (e.g., Docker). •	Experience developing with web technologies such as HTML, JavaScript, and frameworks like Angular or React. •	Solid understanding of database technologies, including both SQL and NoSQL systems. •	Experience developing and integrating RESTful APIs and working within microservices architectures. •	Strong grasp of object-oriented programming, software design patterns, and system performance optimization. •	Proficient in algorithms, data structures, and distributed systems concepts. •	Experience in Agile environments (e.g., Scrum or Kanban) with continuous integration and iterative delivery models. •	Passionate about solving complex, real-world challenges through technology. •	Self-motivated and proactive, with the ability to take ownership and deliver results in fast-paced, collaborative settings. •	Excellent verbal and written communication skills, capable of explaining complex technical concepts to diverse audiences. •	Bachelor degree in Computer Science, Software Engineering, Information Technology, Mathematics, or a related field. Equivalent practical experience may also be considered. This role is not eligible for Mastercard’s work authorization sponsorship. As such, candidates must be eligible to work in the United States, now as well as in the future, without employer sponsorship. #LI-NF1 #AI3<h3></h3>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 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.<h3></h3>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:<ul><li>Abide by Mastercard’s security policies and practices;</li><li>Ensure the confidentiality and integrity of the information being accessed;</li><li>Report any suspected information security violation or breach, and</li><li>Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.</li></ul>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.

Software Engineer II

Design, develop, test, and maintain software using Java, CI/CD, cloud, and microservices; collaborate in Agile teams; hybrid work in O'Fallon, MO.

Our PurposeMastercard powers economies and empowers people in 200&#43; 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<h3></h3>Lead Software Engineer - QE<h3></h3>Overview: Who is Mastercard? Mastercard is a global technology company in the payments industry. Our mission is 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. With connections across more than 210 countries and territories, we are building a sustainable world that unlocks priceless possibilities for all. Team Overview: Decision Management Program (DMP) is a sophisticated, industry-leading intelligence with a range of capabilities that structure and apply complex business logic across the payment journey and beyond to inform and accelerate decisions at scale at Mastercard. The Authorization Decisioning product within DMP combines DMP's powerful capabilities with access to all authorization messages available within Mastercard. With access to the full extent of transactions as they happen, Authorization Decisioning can extract intelligence, add intelligence, and make decisions, all customizable to market-facing products. With the ability to bi-directionally consume and apply intelligence, Authorization Decisioning can transform insights into immediate operational action. The DMP team is looking for someone to join the Authorization Decisioning product as Quality Engineering Lead for driving the adoption of Quality Engineering services—including code quality, test automation, performance engineering, environment automation, development collaboration, and continuous integration across multiple agile feature teams . You will collaborate closely with Quality Engineers, Developers, Operations, DevOps, Product Management, and Program Management to define scope, influence best practices, and deliver high‑impact services that enable flawless customer experiences. Role: Lead quality engineering strategy, automation, and exploratory testing across web, mobile, and API platforms. Drive adoption of QE, performance engineering, CI/CD, and environment automation practices. Implement BDD/TDD, ensure strong code quality, and achieve high automation and code coverage. Provide technical oversight on test automation, code reviews, quality metrics, and engineering best practices. Partner with engineering, DevOps, operations, and product teams to define test strategy and automation scope. Understand end-to-end customer flows and ensure quality across the entire value chain. Oversee integration of test automation with Jenkins/Bamboo, Sonar, and other quality tools. Guide teams on performance testing using JMeter/LoadRunner and support continuous delivery pipelines. Mentor and develop Quality Engineers in a fast-paced, high‑performance culture. Develops and executes performance testing strategies, automation, and best practices to ensure end‑to‑end application reliability and efficiency. Provide production support and when needed reproduce issues across multiple applications and collaborate in driving their resolution. Collaborate with cross‑functional teams to ensure high-quality, customer‑focused delivery. All About You: 12-14 years’ experience in software test automation and quality engineering. Strong Java coding skills; hands-on with Spring, JUnit, Rest Assured, Appium. Expertise with Cucumber/JBehave, REST/SOAP API testing, CI/CD pipelines. Experience with quality tools (Sonar, Clover), security tools (Checkmarx, Fortify), and performance tools (JMeter, LoadRunner). Knowledge of payments domain, design patterns, and ISO message protocols preferred. Familiarity with cloud, Infrastructure‑as‑Code (Chef/Puppet), and device cloud testing platforms. Familiarity with lifecycle tools such as JIRA, Rally, Rational Team Concert. Strong communication skills, including presenting to technology and business leaders. Proven ability to lead teams and drive engineering excellence. Demonstrated success in large-scale automation and testing initiatives. Strong communication, influencing, and mentoring skills.<h3></h3>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 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.<h3></h3>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:<ul><li>Abide by Mastercard’s security policies and practices;</li><li>Ensure the confidentiality and integrity of the information being accessed;</li><li>Report any suspected information security violation or breach, and</li><li>Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.</li></ul><h3></h3>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 RangesO'Fallon, Missouri: $140,000 - $231,000 USD<h3></h3><h3></h3><h3></h3><h3></h3>

Lead Software Engineer - QE

12-14 years in software test automation and quality engineering; strong Java with Spring/JUnit; REST/SOAP API testing; CI/CD; experience with QE tools and performance testing.

Our PurposeMastercard powers economies and empowers people in 200&#43; 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<h3></h3>Software Development Engineer in Test (SDET) II<h3></h3>Overview: Mastercard’s Global Credit Card Authorization team is seeking a Software Development Engineer in Test (SDET) II to help ensure the quality, resilience, and performance of one of the most critical transaction processing platforms in the world. This platform facilitates billions of transactions annually between issuers, acquirers, and service providers across the globe. In this role, you will apply your software development expertise to design and execute robust testing strategies for complex, high‑throughput systems. You will play a key role in raising engineering standards, strengthening production readiness, and embedding quality throughout the development lifecycle. This is a hybrid role based in O’Fallon, MO, with an expectation of three days per week onsite. Role: •	Develop comprehensive test plans based on high‑level design and technical documentation. •	Design, implement, and execute functional, integration, and User Acceptance Testing (UAT) test cases. •	Validate system behavior by analyzing application traces, logs, and metrics to ensure complete test coverage. •	Perform root cause analysis to identify, document, and track software defects. •	Partner with developers and engineers to remove testing blockers and ensure timely completion of test cycles. •	Ensure production readiness by proactively identifying and resolving defects prior to release deployments. •	Contribute to continuous improvement of test processes, tools, and quality practices. •	Actively participate in agile ceremonies, including story refinement and sprint planning. •	Collaborate effectively with cross‑functional teams in a fast‑paced, distributed environment. All About You: •	Experience as a Software Development Engineer in Test (SDET), Quality Assurance or Quality Engineer with previous experience developing and executing functional, integration, and UAT test strategies for complex systems. •	Ability to create detailed test plans from high‑level designs and requirements. •	Strong understanding of software quality practices, defect management, and test coverage methodologies. •	Hands‑on experience working in Linux environments. •	Experience with scripting languages, preferably shell scripting. •	Proficiency in C/C++ or Java for test development and system validation. •	Experience working in a team environment using source control tools, preferably Git. •	Strong analytical, critical‑thinking, and attention‑to‑detail skills. •	Excellent verbal and written communication skills, with the ability to articulate complex ideas clearly and concisely to both technical and non-technical stakeholders. •	Bachelor degree in Computer Science, Software Engineering, Information Technology, Mathematics, or a related field. Equivalent practical experience may also be considered. This role is not eligible for Mastercard’s work authorization sponsorship. As such, candidates must be eligible to work in the United States, now as well as in the future, without employer sponsorship.<h3></h3>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 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.<h3></h3>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:<ul><li>Abide by Mastercard’s security policies and practices;</li><li>Ensure the confidentiality and integrity of the information being accessed;</li><li>Report any suspected information security violation or breach, and</li><li>Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.</li></ul><h3></h3>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 RangesO'Fallon, Missouri: $92,000 - $147,000 USD<h3></h3><h3></h3><h3></h3><h3></h3>

Software Development Engineer in Test (SDET) II

SDET with experience building functional, integration, and UAT test strategies for high-throughput systems. Linux, shell scripting, and programming in C/C++ or Java. Git experience. Bachelor’s in CS/SE/IT/Math. Strong communication.

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

Software Developer

Full-time exempt role seeking an experienced full-stack developer for the DEW product; 8+ years in software development; power systems/energy domain familiarity; proficient in C++, C#, Java; distributed systems; GIS/SQL.

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

Software Developer II

5+ years software development; Angular/TypeScript; Java or OO; SQL databases; cloud tech; QA/testing; Git workflows; AI/automation familiarity.

5+ years in software development; strong front-end and full-stack capabilities; experienced with Angular/TypeScript, Java, and cloud-based microservices; database and testing proficiency; collaborative team player.

Develop and maintain front-end web applications on iVUE Connect Utility Customer Care & Billing; collaborate in cross-functional teams; strong front-end skills.

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