Senior Java Backend Engineer – Blockchain / Payment Processing Systems

Job Title: Senior Java Backend Engineer – Blockchain / Payment Processing Systems

Location: Orlando,FL
Experience Required: 10+ Years

Job Summary

We are seeking a highly skilled Senior Java Backend Engineer with deep expertise in building high-performance, scalable backend systems and prior experience in Blockchain platforms OR Payment Transaction Processing ecosystems.

The ideal candidate should come from a core product engineering background and have hands-on experience designing low latency, highly secure, event-driven backend services that process large volumes of financial or distributed ledger transactions.

This role requires strong backend architecture capabilities, API/microservices development, database optimization, and a thorough understanding of secure transaction workflows.

Must Have Technical Skills

• Strong hands-on development experience in Java 8/11/17
• Expertise in Spring Boot, Spring MVC, Spring Cloud
• Strong experience building RESTful APIs & Microservices
• Hands-on with Distributed Systems / Event Driven Architecture
• Strong experience with Kafka / RabbitMQ / JMS messaging
• Expertise in SQL/NoSQL databases (Oracle, PostgreSQL, MongoDB, Cassandra)
• Experience with Docker, Kubernetes, CI/CD pipelines
• Strong knowledge of System Design, Performance Tuning, Concurrency, Multithreading
• Experience in secure backend transaction processing

Key Responsibilities

• Design and develop highly scalable Java backend microservices
• Build secure APIs/services for transaction lifecycle management
• Work on distributed asynchronous backend processing engines
• Implement low latency, fault tolerant backend architecture
• Integrate with external payment gateways/blockchain nodes/financial systems
• Optimize backend systems for throughput, resiliency, and reliability
• Develop reusable components for transaction validation, audit, and monitoring
• Collaborate with architects, DevOps, product, and security teams
• Ensure coding standards, automated testing, and CI/CD compliance

Required Experience

• 8+ years of strong backend Java development
• Minimum 3+ years in Blockchain backend OR Payment processing backend systems
• Strong experience in high volume transaction systems
• Hands-on coding experience is mandatory (not support/integration-only profiles)
• Strong understanding of secure data handling and financial-grade reliability