Senior Software Engineer Java

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Senior Software Engineer Java

St. Louis, MO

6+ months

5+ Years

We are looking for a highly skilled Senior Software Engineer (Java) to join an elite engineering team working on high-scale, mission-critical systems. This role is ideal for engineers who enjoy solving complex problems, care deeply about code quality, and take a craftsman-like approach to software engineering.

You will work on platforms that operate at extreme throughput (TPS), handle critical workloads, and demand thoughtful system design, reliability, and performance at scale.

• Design, build, and maintain high-performance, scalable backend systems using Java
• Solve complex technical problems using a consultative and analytical mindset
• Collaborate with experienced engineers to evolve architecture and system design
• Ensure engineering excellence through clean code, testing, reviews, and automation
• Recommend technical improvements and defend design decisions with data and reasoning
• Contribute to system reliability, resilience, and observability in high-TPS environments

Core Technologies: Strong hands-on experience with Java 8 / Java 11

• Lambda expressions
• Stream API
• Completable Future & async programming

Deep understanding of Kafka, including:

• Core concepts & messaging semantics
• Replication, reliability, and durability
• Kafka internals, infrastructure, and control
• Data retention strategies

Experience with Mongo

DB (data modeling, performance, and scalability)

Familiarity with Sonar for code quality and technical debt management

CI/CD experience using Jenkins

Databases:
Experience with one or more of the following enterprise databases:
Oracle DB / Sybase IQ / DB2

Rules Engines:
Hands-on experience with Drools or any equivalent rules engine

Java 8 / Java 11, Lambda, Stream API, Kafka, Drools Rules Engine