Senior Backend Engineer - Java

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June 13

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CashJar.com

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Fintech • eCommerce • SaaS

CashJar. com is a payment software development company focused on creating innovative, secure, and reliable payment solutions. Their platform simplifies payment processing, offering a suite of features such as project analytics, real-time project tracking, and Kanban task management. CashJar. com aims to enhance the customer experience while ensuring the security and reliability of financial transactions.

11 - 50 employees

💳 Fintech

🛍️ eCommerce

☁️ SaaS

📋 Description

• Develop and maintain assigned gateway project microservices using Java, Spring Framework, and AWS services • Build RESTful APIs, webhook systems, and processor adapter interfaces per OpenAPI specifications • Implement data access layers, JPA/Hibernate models, and database integration logic • Build integrations with TicketSocket HPP, ProPay APIs, and internal gateway project services • Ensure services meet performance SLAs including <100ms response times and high throughput • Implement PCI-DSS compliant code including encryption, tokenization, and secure data handling • Write comprehensive unit tests, integration tests, and participate in code review processes • Maintain technical documentation, API specifications, and troubleshooting guides

🎯 Requirements

• 5+ years Java development experience with Spring Framework (Spring Boot, Spring Security, Spring Data) • Hands-on experience with AWS services including EC2, RDS, Lambda, API Gateway, SQS, SNS, and S3 • Advanced experience with PostgreSQL or MySQL, JPA/Hibernate, and data modeling skills • RESTful API design using Spring Boot, OpenAPI documentation, and webhook implementation • Experience with distributed systems, service communication, and event-driven architectures • Understanding of encryption, authentication, authorization, and secure coding practices • Unit testing with JUnit/TestNG, integration testing, and mocking frameworks (Mockito)