Senior Java Developer

Job Title:Sr Java Developer

Location: Chicago, IL

Type: W2 Contract

Education Requirements

• High School diploma or equivalent

Preferred Education

• Bachelor's degree

Core Development Required Skills for the Senior Java Developer:

• 8+ years of hands-on experience with Java (J2EE), Spring Boot, and Microservices
• Proven experience developing and supporting cloud-native applications on Microsoft Azure
• Strong expertise in distributed systems, event-driven architectures, and asynchronous processing
• Experience working in Agile and onsite/offshore delivery models

Event Streaming & Messaging (Must Have)

• Extensive hands-on experience with Apache Kafka, including:
• Kafka Producers, Consumers, Topics, Partitions, and Consumer Groups
• Kafka Streams and Event Processing
• Message Ordering, Delivery Guarantees, and Scaling Strategies
• Schema Registry and Event Versioning

Strong Experience With Enterprise Messaging Platforms Such As

• Kafka
• Solace PubSub+
• IBM MQ
• Azure Service Bus
• Event Hubs

Deep Understanding Of

• Event-Driven Architecture (EDA)
• Publish/Subscribe Patterns
• Event Sourcing
• CQRS
• Saga Pattern
• Message Reliability and Error Handling
• Dead Letter Queues (DLQ)
• Event Replay and Recovery Strategies
• Experience designing and implementing high-throughput, low-latency messaging systems
• API & Integration
• Strong hands-on experience with REST APIs, SOAP Services, and Event-Based Integrations
• Strong understanding of API lifecycle management and service integrations

Mandatory Experience With API Security, Including

• OAuth 2.0
• JWT Validation
• Secure Service-to-Service Communication

Azure Cloud

• Azure Kubernetes Service (AKS)
• Azure Container Apps
• Azure Service Bus
• Azure Event Hubs
• Azure Functions
• Azure Storage
• Strong understanding of Azure networking and cloud-native architecture patterns

DevOps & Automation

• Experience with CI/CD pipelines using: GitHub Actions; Jenkins; Terraform
• Strong experience integrating automated testing, security scanning, and deployment automation
• Experience provisioning Azure infrastructure using Infrastructure as Code (Terraform)

Databases

• Experience with Azure SQL, Cosmos DB, PostgreSQL, or other Azure-hosted databases
• Understanding of data consistency models and transactional patterns in distributed systems

Backend Development Experience With

• Python
• Node.js

Preferred Skills

• Experience with Confluent Platform
• Experience implementing Event Mesh architecture using Solace
• Knowledge of Domain-Driven Design (DDD)
• Experience with GraphQL
• Experience with observability and monitoring tools (Dynatrace, Azure Monitor, Log Analytics)
• Linux and Shell Scripting
• Understanding of TDD and BDD practices
• Experience with Control-M, SFTP, and Mainframe integration patterns

Senior Java Developer Overview We are seeking a Senior Java Developer specializing in Event-Driven Architecture and Enterprise Messaging to design, develop, test, and deploy scalable cloud-native applications on Azure. The ideal candidate will have deep expertise in asynchronous processing, event streaming, distributed systems, and enterprise messaging platforms, enabling highly resilient and scalable solutions. You will be responsible for designing and implementing event-driven microservices, messaging solutions, and cloud-native applications using Java, Spring Boot, and Azure services. You will collaborate with cross-functional Agile teams to build highly scalable, secure, and resilient systems leveraging Kafka, Solace, IBM MQ, and Azure messaging technologies.

Responsibilities

• Design and develop scalable event-driven microservices and messaging solutions
• Build, enhance, and support enterprise-grade applications utilizing Kafka, Solace, IBM MQ, and Azure messaging services
• Design event schemas, topics, queues, and integration patterns for highly distributed systems
• Ensure reliability, scalability, observability, and security of messaging platforms and integrations
• Develop and execute unit, integration, and performance testing for messaging-based solutions
• Collaborate with architects and technical leads on event-driven solution design and implementation
• Document architecture, event flows, message contracts, and operational procedures
• Support production deployments and troubleshooting of messaging infrastructure and applications
• Ensure non-functional requirements including security, performance, scalability, resiliency, and maintainability are incorporated into all solutions
• Proactively identify risks, bottlenecks, and dependencies impacting project deliverables