Senior Java Developer (Microservices)

Luxoft Poland; Kraków; On-site; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Private Medical & Dental care

Life Insurance

MyBenefit program

Internal Mobility program

Job summary

Luxoft Poland in Kraków seeks an experienced back-end developer to join a long-term enterprise project in investment banking. You will build and evolve mission-critical services using Java 11+ and Spring Boot, collaborating with architects, QA, DevOps, and product owners.

You will design distributed microservices, implement REST and SOAP APIs, and enable event-driven processing with Kafka. The role emphasizes security, scalability, and maintainability in a cloud-enabled, containerized

Qualifications

• 7+ years enterprise backend development experience.
• Strong Java/Spring Boot with microservices.
• Experience with distributed systems and cloud.
• Experience with OAuth2/JWT/Spring Security.
• Experience with BPM engines (Flowable).
• Experience with Kafka and data stores.

Responsibilities

• Design, develop and maintain enterprise-grade backend services.
• Contribute to the design and evolution of distributed microservices architectures.
• Implement REST and SOAP APIs and event-driven solutions using Kafka.
• Develop BPM workflows using a BPM engine (Flowable).
• Ensure high standards of code quality with SOLID, Clean Code and patterns.
• Write and maintain unit/integration tests (JUnit/TestNG/Mockito/WireMock).
• Work with PostgreSQL, MongoDB, and Azure Cosmos DB.
• Collaborate with DevOps on Docker/Kubernetes deployments.
• Provide technical guidance, perform code reviews, and advocate best practices.
• Collaborate with cross-functional teams (QA, DevOps, product owners).

Skills

Java 11+

Spring Boot

Microservices

Kafka

Flowable BPM

Testing frameworks (JUnit/TestNG/WireJ

SQL/NoSQL databases

OAuth2/JWT/Spring Security

Docker/Kubernetes

Cloud basics

Tools

Flowable BPM

Docker

Kubernetes

PostgreSQL

MongoDB

Azure Cosmos DB

Kafka

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

(Opportunity for Poland-based candidates)

Tax-deductible costs on a contract of employment for all development roles

Stable employment based on an employment contract

Private Medical & Dental care & Life Insurance

MyBenefit program (sports card, well-being program etc.)

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