Senior Java Backend Engineer - Spring Boot, Microservices

Luxoft; Kraków; On-site; PLN 180,000 - 270,000; Full time

Benefits offered by this job

Medical Insurance

Dental Insurance

Life Insurance

Internal mobility

Job summary

Luxoft Kraków is seeking an experienced backend engineer to build and evolve enterprise-grade Java services. You will design and implement distributed microservices using Spring Boot, expose REST/SOAP APIs, and orchestrate BPM-driven workflows with Flowable.

The role emphasizes secure authentication, scalable data stores (PostgreSQL/MongoDB/Cosmos), and cloud-native deployment with Docker and Kubernetes. You will collaborate with architects, QA, DevOps, and product owners in an agile

Qualifications

• Solid experience in JVM programming languages (ideally Java11+) and design patterns.
• Frameworks: Spring Boot
• Proven track record of enterprise level application development for 7+ years
• Understanding of distributed microservices architectures and communication patterns
• Experience with relational and document databases (PostgresSQL, MongoDB, Azure Cosmos)
• Testing Frameworks (JUnit, TestNG, Mockito, WireMock)
• Security & Authentication (OAuth2, JWT, Spring Security)
• Experience with Agile mode of working
• Excellent communication and collaboration skills
• Familiarity with Cloud based technologies

Responsibilities

• Design, develop, and maintain enterprise-grade backend services using Java 11+ and Spring Boot
• Contribute to the design and evolution of distributed microservices architectures
• Implement and integrate REST and SOAP APIs and event-driven solutions using Kafka
• Develop and maintain business process workflows using a BPM engine (preferably Flowable)
• Ensure high standards of code quality by applying SOLID principles, Clean Code, and design patterns
• Write and maintain comprehensive unit and integration tests using JUnit, TestNG, Mockito, and WireMock
• Work with relational and document databases such as PostgreSQL, MongoDB, and Azure Cosmos DB
• Implement security and authentication mechanisms using OAuth2, JWT, and Spring Security
• Collaborate with DevOps teams on containerization and deployment using Docker and Kubernetes
• Provide technical guidance, perform code reviews, and advocate for engineering best practices
• Collaborate closely with cross-functional teams, including QA, DevOps, and product owners

Skills

JVM / Java 11+

Spring Boot

Distributed microservices

Kafka

Flowable BPM

REST / SOAP APIs

JUnit / TestNG

OAuth2 / JWT / Spring Security

Docker / Kubernetes

Cloud technologies

Tools

PostgreSQL

MongoDB

Azure Cosmos DB

Kafka

Flowable

Docker

Kubernetes

Job description

Luxoft Kraków is seeking an experienced backend engineer to build and evolve enterprise-grade Java services. You will design and implement distributed microservices using Spring Boot, expose REST/SOAP APIs, and orchestrate BPM-driven workflows with Flowable.

The role emphasizes secure authentication, scalable data stores (PostgreSQL/MongoDB/Cosmos), and cloud-native deployment with Docker and Kubernetes. You will collaborate with architects, QA, DevOps, and product owners in an agile