Kotlin Developer (f/m/x)

Wymagania: - Expertise in server-side languages, especially Kotlin, and experience with distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes) - Proficiency with relational databases like PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like Grafana - Strong problem-solving skills and a collaborative mindset to mentor and upskill your teammates - Very good knowledge of English - min. B2 level - Fluent Polish required - Residing in Poland required Mile widziane: - Previous work in the fintech industry or with financial products - Knowledge of topics related to payments, cards, or accounting - Experience working in a scale-up environment O firmie: - Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment. - Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment. Zakres obowiązków: - Leading initiatives to design, build, and maintain scalable microservices primarily using Kotlin - Collaborating with cross-functional teams to develop innovative solutions across Platform, Services, SMB, and other domains - Analyzing system performance and implementing optimizations to ensure high reliability and scalability - Participating in code reviews, post-mortems, and providing mentorship to other engineers - Proactively addressing technical debt and guiding the team through technical challenges and migrations Oferujemy: - Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas - Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market - We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 - Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more - Comfortable workplace – class A offices or remote work - Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application - PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers - Investment in your growth – meetups, webinars, training platform and technology blog – you choose - Fantastic atmosphere created by all Sii Power People