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KellyMitchell Group · 19 hours ago

Java Springboot Developer

Hopkins, MN

Contract

Onsite

Senior Level, Lead/Staff

$48/hr - $69/hr

10+ years exp

KellyMitchell Group is seeking a Java Springboot Developer to join their team. The role involves designing, developing, and maintaining RESTful microservices and cloud-native services, while also mentoring engineers and driving performance optimization.

Human ResourcesInformation TechnologyStaffing Agency

H1B Sponsor Likely

Responsibilities

Design, develop, and maintain RESTful microservices using Java 17+ and Spring Boot 3.x

Build distributed, high-throughput systems using Apache Cassandra, including data modeling and query optimization

Develop and deploy cloud-native services on Microsoft Azure such as: AKS, Azure Functions and Service Bus

Implement event-driven architectures using Kafka, RabbitMQ, or Azure Event Hubs

Apply microservices patterns such as API Gateway, Circuit Breakers, Service Discovery, and Distributed Tracing

Containerize and orchestrate applications using Docker, Kubernetes, Helm, and service mesh technologies

Write high-quality unit and integration tests using JUnit 5, Mockito, and related frameworks

Lead code reviews, enforce secure coding practices, and drive performance optimization

Troubleshoot production issues, perform root cause analysis, and improve reliability with strong monitoring and alerting

Mentor engineers, contribute to technical direction, and help ensure overall team success

Maintain technical documentation including architecture diagrams, API specifications, and runbooks

Identify technical debt and propose scalable, best-practice solutions

Qualification

Java 17+Spring Boot 3.xMicroservices architectureApache CassandraMicrosoft AzureKafkaDockerKubernetesCI/CD pipelinesAPI securityCommunication skillsMentoring

Required

10+ years of experience designing and developing large, complex backend systems using Java and OOP principles

6+ years of experience building microservices architectures

5+ years of hands-on experience with Spring Boot and the Spring ecosystem such as: Spring Cloud, Data, Security, REST

3+ years working with streaming and messaging technologies such as: Kafka, RabbitMQ, Azure Service Bus

Proven experience with Apache Cassandra or other NoSQL databases, including production data modeling and performance tuning

Strong experience with containerization and cloud platforms

Experience building APIs using REST, JSON, and familiarity with gRPC and GraphQL

Hands-on experience with CI/CD pipelines

Solid understanding of API security and secure coding best practices

Experience using modern development tools

Strong communication skills and experience collaborating with US-based and global teams

Experience leading and mentoring engineers while remaining a strong individual contributor