We’re looking for a Senior Software Engineer who is comfortable working on large, complex systems and helping transition them into more modular, scalable solutions. You’ll play a key role in shaping architecture, driving technical standards, and ensuring the stability and reliability of business-critical services.Location: Fully remote within PolandEngagement: long-term (min. 6 months)Rate: 140–160 PLN/h net (B2B)Obowiązki Working with sizable monolithic applications and decomposing them into well-structured modules Designing solution architecture and contributing to long-term technical direction Creating and refining complex business logic in an insurance-focused environment Defining engineering standards and supporting the technical roadmap Collaborating closely with product managers, designers, and stakeholders to shape technical solutions Leading technical discussions, mentoring team members, and promoting strong engineering culture Participating in on-call rotations and contributing to high-availability system development Translating product and business requirements into robust technical designs Ensuring data integrity and reliability across business-critical systems Core Technologies Kotlin – minimum 5 years of hands-on experience Java – strong proficiency, used alongside Kotlin in existing systems Spring Framework – especially Spring Boot for building backend services Hibernate – ORM and data persistence AWS – experience with cloud-based infrastructure and services Architecture & System Skills: Working with large monolithic systems and gradually decomposing them into modular, service-oriented components Solid understanding of system architecture, including designing scalable and maintainable solutions Experience building high-availability systems and participating in on-call rotations Domain & Collaboration: Designing and implementing complex business logic (insurance domain is a plus) Ability to collaborate with product teams, designers, PMs, and cross-domain stakeholders Experience influencing technical strategy, setting coding standards, and mentoring other engineers Nice to have: Background in insurance/finance/banking Experience working with cross-domain teams (e.g., underwriting, triage)