Java Developer

Quick Facts

• Role: Java Developer

• Location/Work mode: Warsaw, hybrid (office presence 1x per week)

• Rate: up to 140 PLN/h + VAT (depending on experience and scope)

Description

Provide Java development services focused on designing, implementing, and maintaining API-based integrations between systems. Work on requirements analysis, solution design, defect fixing, and release planning while designing solutions that meet functional and non-functional needs (regulatory, performance, security, and maintainability). Ensure high quality using automated tests and code reviews, with AI/agentic AI tools applied throughout analysis, implementation, testing, documentation, and maintenance.

Responsibilities

• Design, implement, and maintain integrations between systems using APIs

• Analyze requirements, design solutions, remove defects, implement changes, and plan next product versions

• Contribute to system solution design considering functional/non-functional, regulatory, performance, security, and maintenance requirements

• Support data migration processes, environment integrations, and organizational preparation for launching and evolving a new platform

• Ensure solution quality by developing automated tests, participating in integration and system testing, and applying software engineering best practices

• Actively use AI and agentic AI tools in requirements analysis, solution design, implementation, testing, documentation, and maintenance

• Perform code review, configuration review, and integration solution reviews using tools that support quality, security, and architectural compliance

Requirements

• Minimum 5 years of experience in a Java Developer role

• Good knowledge of Apache Kafka

• At least 5 years of experience with Spring, Hibernate, Spring Boot, and Spring Cloud

• At least 5 years of experience with SQL

• Knowledge of software quality assurance, including unit testing frameworks (JUnit, TestNG, Spock) and integration testing frameworks (Testcontainers, WireMock)

• Knowledge of Domain-Driven Design (DDD) with practical experience applying it

• Knowledge of Functional Programming and Object-Oriented Programming paradigms

• Knowledge of application containerization

• Knowledge of process engines and BPMN

• Knowledge of resilience patterns/mechanisms for services in distributed systems

• Ability to use AI tools in the software development process

• Knowledge of tools for diagnosing and analyzing the performance of implemented solutions

• Nice to have: experience with AI agents and agentic AI tools, cloud solutions, Angular framework, and frontend application development

Benefits

• Work across diverse projects in Software, Embedded, Data, and Cloud Services

• Participation in additional pre-sales and expert initiatives

• Medical care, sports card, and access to a cafeteria platform according to applicable cooperation rules