Summary  Join Aperia Solutions, a leader in SaaS solutions for the Payments and Compliance industries. Aperia is a Texas-based fintech and managed consultancy firm that creates custom SaaS applications and other software-based solutions for the payments, banking, and processing industry. Founded in 1999, Aperia offers business intelligence, risk management, compliance, and customer intelligence platforms. With offices in Dallas, Washington DC, and Vietnam, Aperia is a fast-paced, global organization that strives to improve efficiency in compliance, risk, and customer service operations. Aperia’s clients include banks, processors, payment facilitators, merchant service providers, independent sales organizations, and government entities. A career at Aperia promises a great challenge, culture, and opportunities to forge your own path. Job Description At Aperia, we thrive on innovation and the strength of our dynamic development team. We are currently seeking a (Senior/Middle) Full Stack Developer (Java, ReactJS) with a strong background in Java and J2EE who is passionate about modern technologies, cloud-native architecture, and secure, scalable systems. If you’re eager to push boundaries and drive meaningful impact in a fast-paced fintech environment, we want to hear from you. Core Responsibilities * Full lifecycle - analysis, design, development, testing and implementation- of new or enhancements to middleware (micro) services * Maintain middleware modules and services with code quality standards * Keep applications free of security vulnerabilities in compliance with organization’s security policies * Assist in troubleshooting and resolving production issues. Provide suggestions for preventative steps * Incorporate suggestions for improvements and enhancements where meaningful * May assist/lead in developing and maintaining technical documentation and store it in central locations (like Confluence, SharePoint) for accessible to team members. Technical Skills: * 4+ years of hands-on experience in Java/J2EE development. * Expertise in Spring, Spring Boot, Spring Cloud, Spring Security, Spring Data, and RESTful APIs. * Exposure to ReactJS on the frontend. * Working knowledge of RabbitMQ or similar message brokers. * Proficiency in Oracle PL/SQL. * Strong unit testing skills with JUnit. * Experience with build tools like Maven, and artifact repositories like Nexus. * Familiarity with Postman for API testing and PCF (Pivotal Cloud Foundry). * Demonstrated experience in addressing security vulnerabilities and managing open-source dependencies. * Maintain high code quality using tools like SonarQube. * Version control and CI/CD experience using GitLab. * Proficient with Atlassian tools including JIRA and Confluence. * Solid understanding of Linux environments Things that will separate you from the rest: * Experience with JIRA integration and custom workflows. * Familiarity with logging and monitoring tools like Splunk. * Ability to collaborate effectively with onshore and offshore teams. * Background in the finance or banking industry. * Strong problem-solving, debugging, and communication skills (written and verbal). Job Type * Full-Time Schedule * Monday to Friday Work Location  * HCMC: The Six8 Building: 24-26 Phan Dinh Giot, Tan Son Hoa ward. * Danang: VDB Tower: 74 Quang Trung, Hai Chau District Benefits * Competitive Salary Package – Enjoy a rewarding income from day one. * Security from the Start – Full salary during probation plus complete social insurance coverage. * Premium Health Insurance – Comprehensive protection for you and your loved one (spouse/children). * Family-Friendly Benefits – Monthly childcare support to make parenting easier. * Generous Leave Policies – 15 days annual leave, 6 weeks paternity leave, and 10 days bereavement leave. * Active Lifestyle – Join our vibrant clubs: Football, Billiards, Badminton, and E-sports... This job description is not intended to be all-inclusive. An employee may also perform other reasonable related business duties as assigned by their immediate supervisor or management. Principals only. Recruiters please don't contact this job poster. DO NOT contact us with unsolicited services or offers.