Java Developer

We are seeking an experienced Senior Java Developer with strong expertise in Connex Payment Switch to join our payment technology team in Chicago. The ideal candidate will have extensive experience in designing, developing, and supporting high-volume payment switching applications, along with a solid background in Java-based enterprise application development.

The role involves working closely with cross-functional teams to deliver secure, scalable, and high-performance payment solutions while supporting mission-critical payment processing systems., * Design, develop, enhance, and maintain applications built on the Connex Payment Switch platform.

• Develop and support payment transaction processing for credit, debit, ATM, POS, and digital payment channels.
• Build scalable backend services using Java and related technologies.
• Integrate payment switch applications with external banking and payment networks.
• Troubleshoot production issues, perform root cause analysis, and implement permanent fixes.
• Collaborate with product owners, business analysts, QA teams, and architects throughout the software development lifecycle.
• Participate in code reviews and ensure adherence to coding standards and best practices.
• Optimize application performance, scalability, and reliability.
• Support production releases and participate in on-call support as required.

• 8+ years of hands-on Java development experience.
• Strong experience with Connex Payment Switch development and support.
• Excellent knowledge of Core Java, Java 8/11/17, Spring Boot, and Microservices.
• Experience with REST APIs and enterprise integration patterns.
• Strong understanding of payment processing systems and transaction lifecycle.
• Experience with ISO 8583 messaging standards.
• Knowledge of EMV, card payments, ATM/POS transaction flows.
• Experience with Oracle, SQL Server, or PostgreSQL databases.
• Hands-on experience with Git, Maven/Gradle, Jenkins, and CI/CD pipelines.
• Familiarity with Linux/Unix environments.
• Strong debugging and production support skills.

Preferred Skills

• Experience with cloud platforms (AWS preferred).
• Docker and Kubernetes/OpenShift experience.
• Kafka or other messaging platforms.
• Exposure to Agile/Scrum development methodologies.
• Knowledge of payment security standards such as PCI DSS.
• Experience working with financial institutions or payment processors., * Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.
• Strong analytical and problem-solving skills.
• Excellent verbal and written communication skills.
• Ability to work effectively with globally distributed teams.

Nice to Have

• Experience with FIS payment products.
• Exposure to real-time payment systems.
• Experience in payment modernization or payment switch migration initiatives.
• Knowledge of DevOps practices and automated deployment pipelines.