Lead Java Developer (f/m/x)

Sii Polska is a company offering contracts with major brands and a diverse portfolio of clients. They provide an internal training center, mentoring and buddy programs, technology communities, and a variety of employee benefits including medical care, insurance, sport cards, language courses, and profit sharing. The company supports flexible forms of employment and has comfortable, well-equipped offices.

• At least 8 years of professional experience in software engineering with Java
• Previous experience as a Technical Lead, Lead Developer, Senior Developer with mentoring responsibilities, or a similar leadership role
• Strong expertise in Java 17+ and Spring Boot
• Solid understanding of software architecture, distributed systems, and RESTful API design
• Fluency in English and Polish
• Open to a hybrid working model with presence in the office 3 days per week
• Availability to support production releases approximately 1–2 times per month during weekends (around 2 hours per occurrence)
• Residing in Poland required

• Leading technical design discussions and driving architectural decisions across the team
• Evaluating and proposing technical solutions to ensure scalability, maintainability, and performance
• Providing technical guidance and support to developers throughout the software development lifecycle
• Designing and developing backend services and REST APIs using Java and Spring Boot
• Performing hands-on coding for complex features and critical system components
• Supporting production releases and ensuring platform stability

• Fluent Polish required
• Residing in Poland required
• Availability to support production releases approximately 1–2 times per month during weekends (around 2 hours per occurrence)