Senior Java Developer - Payment Systems

Greymatterinnovationz — United States · Posted ~2 hours ago

Senior Full-time Hybrid

Skills

Java Spring Boot microservices REST APIs payment systems REST Microservices

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Summary ✨ AI‑Generated

A senior Java engineering position focused on building reliable payment-related applications, scalable services, and integrations with external financial systems.

Highlights

Senior role working on high-volume transaction systems with opportunities in architecture, optimization, and critical application development.

Description

Greymatter Innovationz helps you stay digitally relevant across domains, technologies, and skillsets, every day. We are looking for: Senior Java Developer with expertise in Connex Payment Switch Location: Riverwoods, IL/ Remote or Hybrid Experience Required: 8+ years in Java Development Key Responsibilities Design, develop, and maintain high-volume applications on the Connex Payment Switch platform.Support transaction processing for credit, debit, ATM, POS, and digital payment channels.Build scalable Java/Spring Boot microservices and integrate switch applications with external banking networks.Handle production support, root cause analysis, and performance optimization for mission-critical systems.In Connex – we need - In enterprise computing and hardware engineering, this refers to Mellanox/NVIDIA ConnectX network cards used in Open Compute Project (OCP) server architectures Required Experience & Technical Skills Core Tech Stack: Core Java (8/11/17), Spring Boot, Microservices, REST APIs, CI/CD, Git, Linux/Unix.Domain Expertise: Connex Payment Switch, ISO 8583 messaging standards, EMV, card payments, ATM/POS transaction flows.Databases: Oracle, SQL Server, or PostgreSQL. Nice to Have / Preferred AWS, Docker, Kubernetes, or Kafka experience.PCI DSS compliance knowledge and FIS payment products experience.Background in payment switch migration or modernization projects. Interested candidates can apply directly or send their updated resume to vik@greymatterinnovationz.com #JavaDeveloper #ConnexSwitch #PaymentSystems #Hiring #TechJobs #ChicagoJobs #SoftwareEngineering #FintechJobs At Greymatter Innovationz, We offer: Motivating Work Environment. Excellent Work Culture. Help you to upgrade yourself to the next level. And More!!!