Senior Java Engineer

1 week ago

Chicago, Illinois, United States Oscar Full time

Our client, a leading financial services firm in Chicago, is seeking a
Senior Java Engineer
to join their core engineering team. This engineer will design and build high-performance, scalable backend systems that support real-time financial applications. The ideal candidate has deep experience with distributed systems, messaging, and high-throughput environments.

Responsibilities

  • Design, develop, and maintain backend services using Java and the Spring ecosystem (Spring Boot, Spring MVC, Spring Data, etc.).
  • Build and optimize microservices supporting large-scale, low-latency financial platforms.
  • Develop real-time streaming and event-driven solutions using Apache Kafka.
  • Implement highly reliable, multi-threaded and concurrent systems for processing financial transactions/data.
  • Collaborate with cross-functional teams (DevOps, Product, Architecture, QA).
  • Ensure system reliability, performance, and scalability through profiling, tuning, and optimization.
  • Write clean, testable code and participate in peer code reviews.
  • Integrate with internal and external APIs, services, and distributed systems.
  • Support production systems, troubleshooting complex performance and reliability issues.

Required Qualifications

  • 5-8+ years of backend engineering experience with Java.
  • Strong command of Java 8+, including Streams, Lambdas, collections, and JVM internals.
  • Expert-level experience with multithreading, concurrency patterns, and asynchronous programming.
  • Hands-on experience building microservices using Spring Boot.
  • Production experience with Kafka (producers/consumers, partitions, schema management, message reliability).
  • Experience with relational databases (e.g., PostgreSQL, MySQL, Oracle) and ORM frameworks (e.g., Hibernate/JPA).
  • Strong understanding of RESTful APIs, distributed systems, and event-driven architectures.
  • Familiarity with CI/CD pipelines, Git, and automated testing frameworks (JUnit, Mockito).
  • Experience in financial services or other regulated, high-performance, low-latency environments (strong plus).

Desired Skills and Experience
Java, spring, kafka, SQL, multi-threading, concurrency

Oscar Associates Limited (US) is acting as an Employment Agency in relation to this vacancy.

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