
Lead Java Backend Engineer
INFOPLUS TECHNOLOGIES
Kraków, Poland • 12m ago • On-site
Senior
On-site
22,000 - 25,000 PLN/yr
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Quick Facts
Role: Lead Java Backend Engineer
Focus: Java/Kotlin microservices, event-driven processing (Kafka), cloud deployment on GCP, and L3 production support
Description
Lead hands-on development of Java (8–21) and Kotlin Spring Boot microservices and REST APIs across the order and trade lifecycle. Build Kafka/Kafka Streams event-driven workflows, deploy containerized services with Docker and Kubernetes on GCP via CI/CD, and manage data using PostgreSQL. Own L3 production support and help evolve legacy systems into modular, cloud-native, event-driven architectures.
Responsibilities
Provide hands-on technical leadership, guiding engineers on design, implementation, and engineering standards; mentor team members
Design, build, and enhance Java (8–21) and Kotlin Spring Boot microservices and REST APIs for order capture, validation, routing, execution, allocation, and booking
Build event-driven flows with Kafka and Kafka Streams for reliable real-time order and trade processing
Deliver containerized services with Docker and Kubernetes on GCP and manage data on PostgreSQL
Apply engineering best practices: clean code, CI/CD, secure SDLC, and automated testing with JUnit and Mockito
Own L3 production support, including performance profiling, incident resolution, and root cause analysis to keep low-latency/high-throughput trading services stable and resilient
Use GenAI-assisted development (e.g., Claude Code) to improve productivity and code quality
Collaborate with Product Owners, Architects, and engineers; lead code reviews, testing strategies, and complex issue troubleshooting
Drive modernization by evolving legacy systems toward modular, cloud-native, event-driven architectures on GCP
Requirements
8+ years of hands-on Java software engineering experience in large-scale or complex environments; technical lead experience
Strong hands-on Java 8, 11, 17, and 21 experience, including migrating applications across Java versions
Spring Boot microservices and REST API design experience; Kotlin experience
Event-driven architecture experience with Kafka and Kafka Streams
Relational data store experience with PostgreSQL
Containerized delivery experience with Docker and Kubernetes on GCP using CI/CD with automated testing
L3 production support experience: performance profiling, incident resolution, and root cause analysis
GenAI-assisted development experience using tools such as Claude Code
Technical leadership experience mentoring engineers while contributing hands-on
Bachelor’s or Master’s degree in Computer Science/Engineering (or equivalent experience)
Claude Certified Architect – Foundations certification
Benefits
Not specified in the provided posting.
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