Senior Java Developer (Microservices)

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

Job summary

Luxoft Poland seeks a seasoned Java backend engineer to join a long-term, enterprise-scale project for a global investment banking client. You will design and evolve backend services, integrate microservices, and contribute to technical direction in an agile team.

You will work with Spring Boot, Java 11+, Kafka, BPM workflows, and cloud-enabled, containerized environments, focusing on security, scalability, and maintainability. Collaborate with architects, QA, DevOps, and product owners.

Qualifications

• Solid JVM experience and design patterns.
• Spring Boot framework expertise.
• Enterprise-level development with 7+ years track record.
• Understanding distributed microservices and communication patterns.
• Databases: PostgreSQL, MongoDB, Cosmos DB.
• Testing: JUnit, TestNG, Mockito, WireMock.
• Security: OAuth2, JWT, Spring Security.
• Agile methodologies and collaboration.
• Cloud familiarity and DevOps awareness.

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 BPM-driven workflows (Flowable) and ensure code quality via SOLID/clean code.
• Write comprehensive unit/integration tests (JUnit, TestNG, Mockito, WireMock).
• Work with PostgreSQL, MongoDB, Cosmos DB; ensure data integrity and performance.
• Implement security with OAuth2, JWT, Spring Security.
• Collaborate with DevOps on Docker/Kubernetes deployments.
• Provide technical guidance, code reviews, and engineering best practices.
• Coordinate with QA, product owners, and cross-functional teams.

Skills

Java 11+

Spring Boot

Microservices

PostgreSQL

MongoDB

Cosmos DB

JUnit

TestNG

Mockito

WireMock

OAuth2

JWT

Spring Security

Agile

Cloud

RESTful APIs

Tools

Flowable

Job 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)