Senior Java Developer (Microservices)

Luxoft Poland; Kraków; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

Luxoft Poland in Kraków is seeking a skilled Java backend engineer for a long-term enterprise project in the investment banking sector. You will design, build, and evolve backend services using Java 11+ and Spring Boot within a distributed microservices environment.

You will collaborate with architects, QA, DevOps, and product owners in an Agile setup, implementing REST/SOAP APIs, Kafka messaging, and BPM-driven workflows with Flowable.

Qualifications

• Solid experience in JVM languages (Java11+).
• Spring Boot and enterprise backend development.
• Experience with distributed microservices architectures.
• Experience with relational and NoSQL databases (PostgreSQL, MongoDB, Cosmos DB).
• Testing frameworks: JUnit/TestNG/Mockito/WireMock.
• Security: OAuth2/JWT, Spring Security.
• Agile practices and collaboration in cross-functional teams.
• Cloud technologies familiarity.

Responsibilities

• Design, develop, and maintain enterprise backend services with Java 11+ and Spring Boot.
• Contribute to distributed microservices architecture design and evolution.
• Implement REST and SOAP APIs and event-driven solutions using Kafka.
• Develop BPM workflows with a BPM engine (Flowable preferred).
• Ensure code quality using SOLID, Clean Code, and design patterns; conduct reviews.
• Write unit and integration tests with JUnit/TestNG/Mockito/WireMock.
• Work with PostgreSQL, MongoDB, and Cosmos DB; engage in cloud/container environments.
• Implement security/authentication via OAuth2, JWT, Spring Security.
• Collaborate with DevOps on Docker/Kubernetes deployment; mentor peers.

Skills

Java 11+

Spring Boot

Microservices

PostgreSQL

MongoDB

Cosmos DB

OAuth2/JWT

Spring Security

JUnit/TestNG

Kafka

Docker

Kubernetes

Agile

Cloud basics

Tools

Flowable BPM

Kafka

Docker

Kubernetes

Job description

hybrid work - 3 days/week from the office Fabryczna Office Park, Krakow

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)