Senior Backend Java Engineer - Hybrid (Warsaw, 3x/wk)

Mr Wolf Sp. z o.o.; Warszawa; Hybrid; PLN 240,000 - 360,000; Full time

Job summary

Mr Wolf Sp. z o.o. is seeking a Software Engineer III – Backend Java to join an international tech company building a large-scale E-Commerce Platform.

The role focuses on backend services for purchasing, subscriptions and account management across multiple markets, prioritizing scalability, reliability and availability. You will work on expanding the platform while modernizing its tech stack, influencing architecture decisions and collaborating with Product and Engineering teams.

Qualifications

• 4+ years of professional software development experience.
• Strong commercial experience with Java and Spring Boot.
• Hands-on experience building highly scalable distributed systems.
• Solid understanding of algorithms, data structures and software design.
• Experience with automated testing principles and frameworks.
• Professional working proficiency in English.

Responsibilities

• Develop high-quality, scalable backend services using modern technologies.
• Build and evolve highly scalable distributed systems.
• Write clean, efficient and maintainable code following best practices.
• Contribute to technical design and architecture decisions.
• Take ownership from investigation to production deployment.
• Collaborate with Product Managers and cross-functional teams.
• Participate in code reviews and mentor others.
• Support on-call rotation and production issues.

Skills

Java

Spring Boot

Distributed systems

Algorithms

Observability

Automated testing

Mentoring

English proficiency

Tools

Jira

Confluence

GitHub

PHP

Job description

Mr Wolf Sp. z o.o. is seeking a Software Engineer III – Backend Java to join an international tech company building a large-scale E-Commerce Platform.

The role focuses on backend services for purchasing, subscriptions and account management across multiple markets, prioritizing scalability, reliability and availability. You will work on expanding the platform while modernizing its tech stack, influencing architecture decisions and collaborating with Product and Engineering teams.