Java developer for mainframe systems

act digital EMEA - Alter Solutions; Warszawa; On-site; PLN 216,000 - 308,000; Full time

Benefits offered by this job

Medicover/health coverage

Multisport card

Mobility Program

Training and certifications co-finance

Referral bonus up to PLN 6,000

Team events

Job summary

act digital EMEA - Alter Solutions приглашает опытного Java-разработчика в команду международных проектов. Ваша роль — проектирование и разработка REST API на Java и Spring Boot, работа по контракту OpenAPI/Swagger, интеграция через IBM MQ, наставничество коллег и участие в миграции архитектуры.

Работа предполагает работу в среде PaaS/контейнерах, англоязычное взаимодействие с командой в Дании. Гибкость по форме сотрудничества: employment или B2B, продвижение и обучение за счет компании, бонусы

Qualifications

• Опыт разработки ПО не менее 5 лет.
• Глубокие знания Java и Spring Boot, подтвержденный практикой.
• Опыт проектирования и реализации REST API.
• Практические знания OpenAPI/Swagger и контрактов API.
• Опыт работы с IBM MQ или аналогичными технологиями обмена сообщениями.

Responsibilities

• Разработка и дизайн REST API на Java/Spring Boot.
• Создание API по контракту с OpenAPI/Swagger.
• Интеграционные и транспортные сервисы через IBM MQ.
• Участие в миграциях архитектуры.
• Менторство коллег и передача знаний.
• Поддержка развёртываний на PaaS и в контейнеризованных средах.

Skills

Java

Spring Boot

REST API design

OpenAPI/Swagger

IBM MQ

Integration patterns

Containerized environments / PaaS

Mentoring

English proficiency

Tools

IBM MQ

OpenAPI/Swagger

Job description

Описание:

Our mission as an IT services company is to deliver the best solutions to our clients around the world. We achieve this by analyzing our clients' needs and matching them with the skills and aspirations of our employees. That is why one of our main motivations is to ensure a satisfying experience for every Employee and Consultant. Joining us means becoming part of a community of diverse personalities. Start your journey with act digital!

Задачи:

• Designing and developing REST APIs using Java and Spring Boot.
• Creating APIs using a contract-first approach with OpenAPI/Swagger.
• Developing integration and transport services connecting digital solutions with mainframe systems via IBM MQ.
• Mapping and validating data, handling errors, and ensuring reliable message exchange.
• Supporting deployments on PaaS platforms and in containerized environments.
• Participating in a potential migration from a single-cluster to a multi-cluster architecture.
• Mentoring and training other developers.
• Preparing an orderly handover of solutions and technical knowledge.

Требования:

• At least 5 years of software development experience.
• Very good knowledge of Java and Spring Boot, supported by practical experience.
• Experience designing and implementing REST APIs.
• Practical knowledge of OpenAPI/Swagger and API contracts.
• Experience working with IBM MQ or similar communication technologies.
• Knowledge of integration patterns and asynchronous communication.
• Experience in containerized environments and/or on PaaS platforms.
• Ability and willingness to mentor and train developers and share knowledge.
• Fluent spoken and written English, essential for daily collaboration with the team in Denmark.
• Будет плюсом: Knowledge of COBOL and practical experience developing mainframe systems; Experience integrating Java applications with COBOL/mainframe systems; Experience in the banking or payments sector

Условия:

• Contract: B2B.
• Rate: up to PLN 190/hour net + VAT.
• Project start: December 2026.
• Access to local and international projects - clients from France, Germany, Portugal, the United Kingdom, and the Benelux countries.
• Support for professional development - training, technical certifications, participation in conferences, foreign language lessons, and soft skills training co-financed up to PLN 2,000.
• Flexibility - you choose the form of cooperation: an employment contract or a business-to-business contract.
• Referral bonus for recommending candidates of up to PLN 6,000.
• Fully paid Medicover card.
• Multisport card.
• Regular team events and gifts.
• Mobility Program.
• Long-term cooperation.