Java Developer, Sr. - 100% Remote

About the Company

The hiring organization is seeking an experienced software engineer to support the development of enterprise payment processing and merchant acquiring systems. The company name was not provided in the job listing.

About the Role

We are seeking a Senior Java Developer with strong experience in merchant acquiring, payment processing, and backend application development. This role focuses on building secure, scalable, and high-performance payment systems using modern Java technologies, microservices, and cloud-native architectures.

You will develop APIs and backend services that support payment authorization, capture, settlement, reconciliation, and transaction processing. Working closely with product managers, architects, QA, and engineering teams, you will contribute to technical design decisions, improve system performance and reliability, and help maintain high engineering standards. You will also mentor junior developers and support modern development and deployment practices.

Key Responsibilities

• Design, develop, and maintain scalable backend applications using Java.
• Build and enhance REST APIs and microservices for merchant acquiring and payment processing.
• Develop secure, high-performance solutions for payment authorization, capture, settlement, reconciliation, and transaction processing.
• Collaborate with product managers, architects, QA, and cross-functional engineering teams.
• Participate in system architecture discussions and technical design reviews.
• Optimize application performance, reliability, scalability, and maintainability.
• Write clean, well-tested code that follows established engineering practices.
• Support CI/CD pipelines and modern DevOps processes.
• Mentor junior developers and contribute to technical excellence across the engineering team.
• Apply secure application development practices and sound API design principles.

Required Qualifications

• At least 8 years of professional Java development experience.
• Strong expertise in Java 11 or later; Java 17 or Java 21 is preferred.
• Extensive experience with Spring Boot, REST APIs, microservices, and JPA/Hibernate.
• Hands-on experience with merchant acquiring, payment gateways, payment processing, or financial services.
• Understanding of payment transaction lifecycles, including authorization, capture, settlement, and reconciliation.
• Experience with relational databases such as PostgreSQL or Oracle.
• Strong understanding of secure application development and API design.
• Experience working in Agile/Scrum environments.
• Excellent communication and collaboration skills.
• Working knowledge of Git, Docker, AWS, CI/CD, and Agile/Scrum practices, as listed among the required skills.
• Current residence in the United States.
• Authorization to work in the United States without employer sponsorship.

Preferred Qualifications

• Experience with cloud platforms, particularly AWS.
• Experience with Docker and Kubernetes.
• Familiarity with Kafka or other messaging platforms.
• Knowledge of CI/CD tools such as Jenkins, Bamboo, or GitHub Actions.
• Experience with OAuth2, OpenID Connect, or modern authentication mechanisms.
• Previous experience with enterprise payment platforms or fintech organizations.
• Familiarity with card networks such as Visa, Mastercard, American Express, and Discover.
• Knowledge of PCI-DSS requirements.
• Experience with event-driven architecture and messaging technologies such as Kafka or RabbitMQ.
• Experience working with high-volume transactional systems.

Location and Work Arrangement

• Remote position within the United States.
• Candidates must currently reside in the United States and be authorized to work without sponsorship.