Lead Java Backend Architect – Cloud-Native Microservices

Infoplus Technologies UK Limited; Województwo małopolskie; Hybrid; PLN 180,000 - 300,000; Full time

Job summary

Infoplus Technologies UK Limited is seeking a senior software engineer in Krakow to lead a skilled team in a hybrid work model (min 3 days on-site). You will guide design choices and engineering standards while mentoring peers.

The role focuses on Java 8–21 and Kotlin Spring Boot microservices, Kafka-based event flows, and cloud-native deployments on GCP, with emphasis on performance, reliability, and secure SDLC practices.

Qualifications

• 8+ years of hands-on Java software engineering in large-scale or complex environments, including experience in a technical lead role.
• Experience delivering scalable microservices with Spring Boot and designing REST APIs; Kotlin experience is a plus.
• Strong knowledge of Java versions (8/11/17/21) and migrating apps across versions.
• Proficiency with Kafka/Kafka Streams and relational data stores (PostgreSQL).

Responsibilities

• Provide hands-on technical leadership to engineers, guiding design, implementation, and engineering standards.
• Design, build, and evolve Java (8-21) and Kotlin Spring Boot microservices and REST APIs across the order/trade lifecycle.
• Build event-driven flows using Kafka and Kafka Streams for real-time processing.
• Deliver containerized services with Docker and Kubernetes on GCP; manage data on PostgreSQL.
• Apply CI/CD, secure SDLC, and automated testing with JUnit and Mockito.
• Own L3 production support including performance profiling and root-cause analysis.
• Use GenAI-assisted development to improve productivity and code quality.
• Collaborate with Product Owners, Architects, and engineers; lead code reviews and testing strategies.
• Drive modernization toward modular, cloud-native, event-driven architectures on GCP.

Skills

Java

Spring Boot

Kafka

Kubernetes

Docker

PostgreSQL

CI/CD

Unit testing

GenAI tools

Technical leadership

Education

Bachelor's or Master's degree in CS/Engineering

Tools

Claude Code

Job description

Infoplus Technologies UK Limited is seeking a senior software engineer in Krakow to lead a skilled team in a hybrid work model (min 3 days on-site). You will guide design choices and engineering standards while mentoring peers.

The role focuses on Java 8–21 and Kotlin Spring Boot microservices, Kafka-based event flows, and cloud-native deployments on GCP, with emphasis on performance, reliability, and secure SDLC practices.