Senior Java Engineer - Hybrid, 4‑Day Office Week

StoneX Group Inc.; Kraków; Hybrid; PLN 180,000 - 260,000; Full time

Job summary

StoneX Group Inc. is hiring a Senior Java Software Engineer in Kraków for the EIT Dev Technology Internal Hub. You will contribute across the full development lifecycle, design and architect solutions, mentor teammates, and deliver robust, scalable code in an Agile environment.

The role requires strong Java expertise, REST/microservices experience, and a proactive, collaborative attitude. Hybrid work arrangement and a 12-month B2B contract are offered.

Qualifications

• Advanced English speaking/writing.
• 5+ years of Java experience in a professional environment.
• 5+ years of relational database experience (SQL).
• 5+ years of REST APIs, micro-services, databases, unit testing, version control (Git) and Agile methodology.
• Great knowledge/experience in messaging platforms (Kafka, RedPanda).
• Can do attitude to work.
• Take accountability for technical designs and justify solutions.
• Professionalism in handling constructive feedback and learn/adapt.
• Strong work ethic and attention to detail.

Responsibilities

• Contribute to all phases of the development lifecycle within Agile methodology.
• Take responsibility for the design and architecture of technical solutions.
• Mentor other technical members in the team.
• Write well designed, testable and efficient code.
• Ensure designs follow specifications and review procedures.
• Collaborate with other developers, BAs, and QAs.
• Document all components/methodologies as required.

Skills

Advanced English communication

5+ years Java experience

5+ years relational databases

5+ years REST APIs & microservices

Agile methodology

Strong problem solving

Effective interpersonal skills

Education

University degree in Computer Science or Software Engineering

Tools

Spring Boot

Kafka/Redpanda

PostgreSQL

MSSQL

Git

CI/CD DevOps

Azure

gRPC

Unit/Integration Testing

Job description

StoneX Group Inc. is hiring a Senior Java Software Engineer in Kraków for the EIT Dev Technology Internal Hub. You will contribute across the full development lifecycle, design and architect solutions, mentor teammates, and deliver robust, scalable code in an Agile environment.

The role requires strong Java expertise, REST/microservices experience, and a proactive, collaborative attitude. Hybrid work arrangement and a 12-month B2B contract are offered.