Explore 2 senior full stack java react developer jobs from 2 hiring companies in Montgomery City, MO, US. Filter by remote, salary, experience, and company, then open any listing to apply.

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Senior Full Stack Java React Developer

Fulton

Mexico

Wentzville

Columbia

Troy

O'Fallon

Lake Saint Louis

Washington

Warrenton

Jefferson City

Saint Peters

Dardenne Prairie

Union

Vandalia

Bowling Green

Wellsville

Wright City

Hermann

Weldon Spring

Senior Full Stack Java React Developer Jobs

Mastercard

Paytient

Hybrid

Onsite

<div class="content-intro"><p><strong>About Paytient:</strong><br>We’re on a mission to help people better access and afford care. &nbsp;</p>
<p>Every day, millions of people, and their loved ones, need to see a doctor. For most of us, that moment is an uncertain one - we’re unsure of what’s wrong, who to go to, how long it’ll take to be seen, when we’ll feel better, and what it’ll cost.</p>
<p>Paytient partners with thoughtful employers and health plans who understand the impact of that moment and want to ensure that every one of their plan members are easily able to access and afford care. Our clients understand that an improved ability to self-pay for care changes patient behavior and creates value for the health plan.&nbsp; This founding belief is becoming an emerging standard of care in health plan design and is now, in fact, a mandatory capability in some governmental health plans. Founded in 2018, Paytient is now part of nearly 6,000 employer health plans and providing certainty that people are better able to access and afford care.</p>
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<div class="p-rich_text_section">We’re looking for passionate, collaborative builders to join our team and help us create a future where everyone can more easily access and afford care.&nbsp;</div>
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</div></div><p><strong>About The Role: </strong></p>
<p>We're actively recruiting for a Senior Full-Stack Engineer who is motivated by solving big challenges and passionate about working closely with product managers, designers, and other engineers to build elegant software. If you're excited about working at a high-growth, venture-backed company and want to make an impact by building products that help people, we'd love to hear from you!</p>
<p>In this role, you'll work primarily on the backend while contributing across the full stack, including frontend (React/React Native) and backend (Java/Spring Boot + Kotlin) applications. Deep backend expertise is essential, while frontend experience is a plus - we'll look to you to own complex server-side systems and collaborate on frontend as needed. This position is on our Growth &amp; Core Ops Product Engineering team, where we build the foundational systems that power our business. As an Engineer on this team, you'll solve complex, high-stakes backend challenges, from automating intricate payroll deductions and ensuring the integrity of member census data, to transforming manual processes into elegant, automated workflows for invoicing, subscription management, and financial reporting.</p>
<p>Our "remote with roots" model allows us to work where we thrive and gather as needed, often in our home office in Columbia, Missouri. This role can be performed from anywhere in the continental U.S., with the exception of Montana.</p>
<p><strong>What You'll Do:</strong></p>
<ul>
<li>Collaborate with product managers, designers, and engineers to build scalable, reliable backend systems that power our core financial and data ecosystems, with frontend contributions as needed.</li>
<li>Lead backend development using Java/Spring Boot or Kotlin to build robust systems for payroll deductions, payment processing, and automated invoicing, while contributing to our React frontend when the work requires it.</li>
<li>Write clean, maintainable, and well-tested backend code that balances performance with the high level of accuracy required for census data management and subscription billing.</li>
<li>Lead initiatives and own complex backend projects, such as architecting seamless payment integrations or scaling our subscription management engine, from concept through delivery.</li>
<li>Influence backend architectural decisions and contribute to a long-term technical strategy that ensures data integrity across our payroll and financial reporting pipelines.</li>
<li>Drive engineering excellence by authoring clear technical documentation, including RFCs and ADRs for new architectural patterns, and maintaining up-to-date runbooks to ensure our systems remain reliable and easy to operate.</li>
<li>Leverage AI assisted development tools to accelerate delivery, optimize workflows, and enhance code quality, while maintaining a critical eye for security and best practices.</li>
<li>Participate in code reviews and technical discussions, ensuring our systems handle complex business logic (like deduction calculations) with precision and security.</li>
<li>Provide technical mentorship and guidance to other engineers, fostering a culture of excellence in healthcare and financial engineering.</li>
<li>Work in a modern, cloud-native environment leveraging infrastructure-as-code and CI/CD pipelines to support rapid, high-quality delivery of mission-critical financial features.<strong><br></strong></li>
</ul>
<p><strong>What You'll Bring:</strong></p>
<ul>
<li>5+ years of professional experience with a proven track record of technical impact and leadership, with a strong emphasis on backend systems.</li>
<li>Strong problem-solving skills, curiosity, and the ability to navigate complex challenges in high-stakes financial environments.</li>
<li>Deep experience with Java, Spring Boot, or Kotlin is required - this is the core of what you'll do. Experience with or interest in React for occasional fullstack contributions is a plus.</li>
<li>An AI-forward mindset, with experience using AI assisted development tools (like GitHub Copilot, Claude Code, or OpenCode) to streamline workflows, refactor code, and accelerate problem-solving.</li>
<li>Comfort working in a cross-functional environment, collaborating closely with Product, Design, Compliance, Support, and Operations.</li>
<li>A history of building features for complex, high-scale backend systems, with exposure to user-facing web or mobile applications.</li>
<li>Strong communication skills and the ability to work effectively in a remote or hybrid setting, including the ability to write clear, concise technical documentation.</li>
<li>Preferred: Experience in Fintech, Healthcare, HRIS, or Benefits Administration (specifically dealing with payroll, census data, or tax logic).</li>
<li>Bonus: Experience working in regulated industries within security and compliance frameworks like SOC 2 and HITRUST.<strong><br></strong></li>
</ul>
<p>If you're excited to tackle interesting backend engineering challenges, build meaningful products, and grow your career, we'd love to hear from you!</p><div class="content-conclusion"><p><strong>Benefits We Offer for Full-Time Roles:&nbsp;</strong></p>
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<li data-stringify-indent="0" data-stringify-border="0">Medical, dental and vision insurance</li>
<li data-stringify-indent="0" data-stringify-border="0">$4,400 annual HSA contribution</li>
<li data-stringify-indent="0" data-stringify-border="0">Paytient Health Payment Account (HPA)</li>
<li data-stringify-indent="0" data-stringify-border="0">Monthly lifestyle spending stipend</li>
<li data-stringify-indent="0" data-stringify-border="0">Five weeks of annual PTO</li>
<li>Week-long fully paid 'summer break' for all employees!</li>
<li data-stringify-indent="0" data-stringify-border="0">Ten weeks of bonding leave for new parents</li>
<li data-stringify-indent="0" data-stringify-border="0">Two weeks of caregiver leave</li>
<li>Employer paid short-term and long-term disability</li>
<li data-stringify-indent="0" data-stringify-border="0">401k plan access with a 4% employer match</li>
<li data-stringify-indent="0" data-stringify-border="0">Stock options in Paytient</li>
<li data-stringify-indent="0" data-stringify-border="0">...and more!</li>
</ul>
<p><em>Paytient is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws.<br><br>⚠️ Important Notice ⚠️ Please note that all official Paytient recruiting emails come from @<a class="app-aware-link " href="http://paytient.com/" target="_self" data-test-app-aware-link="">paytient.com</a>. If you receive emails from any domain other than @<a class="app-aware-link " href="http://paytient.com/" target="_self" data-test-app-aware-link="">paytient.com</a>, do not respond and report it to us immediately.<br><br></em></p></div>

Senior Full-Stack Software Engineer (Backend-Focused)

Senior Full-Stack Software Engineer

5+ years backend-focused software engineering; strong Java/Spring Boot or Kotlin; React knowledge; cloud-native; remote work.

<p><span><b>Our Purpose</b></span></p><p></p><p><i>Mastercard 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.</i></p><p></p><p><b>Title and Summary</b></p><h3></h3><p></p>Senior Software Engineer<h3></h3><p style="text-align:inherit"></p>Who is Mastercard? <br> <br>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 respect 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. <br><br><br>About the Role:<br><br>Responsible for the analysis, design, full-stack development, and delivery of software solutions.  <br><br>Define requirements for new applications and customization adhering to MasterCard standards, processes and best practices.  <br><br>Develop, customize, and test applications to integrate Mastercard’s specifications.  <br><br>Provide leadership, mentoring, and technical training to other team members. <br><br><br>Role:<br><br>- Plan, design, develop, and deliver technical solutions that meet business requirements in alignment with Mastercard standards, processes, and best practices. <br>- Lead day-to-day development and maintenance activities to meet SLAs, ensuring high-quality, scalable, cost-effective solutions with rapid time to market. <br>- Own the full System Development Life Cycle (SDLC), including requirements definition, design, development, testing strategy, performance benchmarking, release planning, deployment, and contingency/back-out plans, feasibility study, cost and time analysis and detailed estimates. <br>- Provide production support, including incident management, root cause analysis, remediation, and participation in on-call support rotations. <br>- Select and apply appropriate technical frameworks, tools, and delivery methodologies based on project and technology needs. <br>- Maintain and evolve solution architectures and technology roadmaps. <br>- Research, evaluate, and recommend emerging technologies, frameworks, and methodologies. <br>- Participate in Proofs of Concept (PoCs) and collaborate with vendors to support product and technology selection. <br>- Coordinate with offshore development teams to manage daily activities and delivery. <br>- Ensure adherence to Quality Assurance and Quality Control standards; continuously identify opportunities to improve processes and efficiency. <br>- Ensure adequate coverage across Unit Testing, System Testing/Integration Testing, and performance testing. <br>- Conduct quality inspections and reviews throughout the SDLC (requirements, design, code, security) to ensure compliance with Mastercard standards. <br>- Mentor, coach, and provide technical training to team members, including knowledge-sharing sessions on new technologies and practices. <br><br> <br>All About You: <br><br>Strong hands-on experience with:  <br><br>- Backend Development: Java, Spring Boot <br>- Frontend Development: Angular (preferred), Node.js or React required <br>- CI/CD tools (e.g., Jenkins, GitLab, Bitbucket, Azure DevOps) <br>- Oracle/SQL <br>- Messaging technologies (e.g., Apache Kafka or equivalent) <br>- Monitoring tools (e.g., Splunk, Dynatrace, CloudWatch or equivalent) <br>- Strong understanding of cloud architecture and end-to-end automated testing frameworks. <br>- Demonstrated experience building and supporting complex, enterprise-scale systems (financial services experience preferred). <br>- Solid understanding of software engineering concepts, design patterns, and modern development methodologies. <br>- Ability to take on new initiatives and work effectively in a matrixed, geographically distributed team environment. <br>- Possesses strong communication skills – both verbal and written  <br>- Willingness and ability to learn and take on challenging opportunities <br>- Bachelor's degree in Information Systems, Information Technology, Computer Science, Engineering, or equivalent practical experience preferred.<h3></h3><p style="text-align:inherit"></p>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><p style="text-align:inherit"></p><p style="text-align:left"><b>Corporate Security Responsibility</b></p><p style="text-align:left"><br />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:</p><ul><li><p style="text-align:left">Abide by Mastercard’s security policies and practices;</p></li><li><p style="text-align:left">Ensure the confidentiality and integrity of the information being accessed;</p></li><li><p style="text-align:left">Report any suspected information security violation or breach, and</p></li><li><p style="text-align:left">Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.</p></li></ul><p style="text-align:inherit"></p><p style="text-align:inherit"></p><h3></h3><p style="text-align:inherit"></p>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.<p style="text-align:inherit"></p><p style="text-align:left"><b>Pay Ranges</b></p>O'Fallon, Missouri: $115,000 - $184,000 USD<h3></h3><p style="text-align:inherit"></p><h3></h3><p style="text-align:inherit"></p><h3></h3><p style="text-align:inherit"></p><h3></h3><p style="text-align:inherit"></p>

Senior Software Engineer

Analyze, design, full-stack develop, and deliver software solutions; lead SDLC; mentor teammates; strong Java/Spring Boot, Angular/Node/React, CI/CD, Oracle SQL, Kafka; cloud and testing exposure.

Senior Full Stack Java React Developer Jobs in Montgomery City, MO, US | HiringCafe: every job on earth

Senior Full Stack Java React Developer Jobs in Montgomery City, MO, US

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