Optomi, in partnership with a leading logistics company is seeking a Senior Full Stack Java Developer (Java / Kafka / Spring Boot / AWS) to support and modernize critical systems within the Mechanical organization. This team maintains locomotives, railcars, and detector systems that capture millions of operational and safety data points across the network. About the Position: The role focuses on refactoring legacy microservices, scaling event-driven architectures, re-platforming rules engines, and building cloud-native, resilient, high-volume IoT data pipelines. This is a high-impact engineering role where your work directly influences safety, reliability, and operational efficiency across one of the largest transport networks in the US.Apply Today if your Background Includes: 6+ years of Full Stack experience with a backend emphasis in Java Spring Boot development. Strong event-driven architecture + Kafka experience Proven experience modernizing legacy microservices & distributed systems AWS Cloud experience Hands-on Python experience for backend/data workflows DevSecOps mindset: automated testing, CI/CD, secure coding Experience supporting both greenfield and legacy systems Strong relational DB experience (Postgres preferred) Experience handling IoT or high-volume sensor data pipelines Familiarity with open-source tooling and cloud-agnostic architectures Ability to mentor junior engineers and provide technical leadership What the Right Professional Will Enjoy!Fully remote work opportunity with up to 20% travel.Opportunity to work with a fast-growing team focused on modernization, cloud adoption, and automation. Direct impact on safety, rail operations, and national freight logistics. Work on high-volume IoT, event-driven architectures, cloud-native systems.Exposure to AI/GenAI, automation, and open-source tooling Leadership opportunities with junior developers Responsibilities: Modernize legacy microservices and distributed systems supporting mechanical operations and detector networks.Design and implement backend services using Java, Spring Boot, event-driven patterns, and Kafka.Scale and optimize high-volume IoT data pipelines (30M+ incoming data points from sensors/detectors). Lead architecture, design, and deployment efforts for new and existing services.Refactor and support large rules-engine frameworks (600+ rulesets).Contribute to cloud-native development (AWS preferred; Azure acceptable; cloud agnostic mindset encouraged). Use Python for backend workflows, automation, and data processing tasks. Build automated CI/CD and testing frameworks following DevSecOps best practices. Work with Postgres and relational databases to tune, model, and integrate data. Mentor junior developers and support a strong engineering culture focused on speed, clarity, and automation. Collaborate across teams to build scalable, modern systems.Support both new development and the existing application footprint.