Senior Java Developer (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

Private Medical & Dental care & Life Insurance covered

Internal Mobility program - possibility of rotation between projects, locations, accounts

...and more!

Project Description:

You will join a long-term, enterprise-scale project for a global client in the investment banking domain. The project focuses on building and evolving a set of mission-critical backend services that support complex business workflows, regulatory processes, and system integrations across the bank's ecosystem.

The platform is based on a distributed microservices architecture, leveraging Spring Boot, event-driven communication, and BPM-driven process orchestration. The system operates in a cloud-enabled, containerized environment, with a strong emphasis on security, scalability, resiliency, and maintainability.

You will work closely with architects, QA engineers, DevOps, and business stakeholders in an agile setup, contributing not only code but also technical direction, best practices, and mentoring.

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

Mandatory Skills Description:

• 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

Nice-to-Have Skills Description:

• experience in or willing to learn Java reactive programming/ Spring Webflux
• springboot Microservices
• experience with NoSQL databases (ideally MongoDB or CosmosDB)