Java Backend Developer with payments systems or blockchain

Position: Java Backend Developer with payments systems or blockchain

Location: NYC, NY/Lake Mary, FL/Pittsburgh, PA (Onsite/Hybrid)

Duration: Long Term

Employment Type: W2 / 1099 / C2C

Job Summary

We are looking for a strong Java Backend Developer with hands-on experience in payments systems or blockchain technologies. The ideal candidate will design, develop, and maintain scalable backend services supporting high-volume, secure financial transactions.

Key Responsibilities

·        Design and develop high-performance backend systems using Java (Spring Boot / Microservices)

·        Build and integrate payment processing systems (ACH, Wire, SWIFT, Cards, UPI, etc.)

·        Work on real-time transaction processing with high reliability and low latency

·        Develop APIs and services for blockchain-based applications (if applicable)

·        Ensure security, compliance, and data protection (PCI-DSS, encryption, tokenization)

·        Collaborate with product, QA, and DevOps teams for end-to-end delivery

·        Optimize applications for performance, scalability, and fault tolerance

Required Skills

·        Strong experience in Java, Spring Boot, Microservices architecture

·        Hands-on with REST APIs, Kafka / RabbitMQ

·        Experience with payment gateways/processors (Stripe, PayPal, Adyen, etc.)

·        Understanding of transaction lifecycle, reconciliation, settlements

·        Database experience: SQL (PostgreSQL, MySQL) + NoSQL

·        Cloud exposure: AWS / Azure / Google Cloud Platform

·        Good understanding of system design and distributed systems