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Sii Sp. z o.o.

Kotlin Developer (f/m/x)

Sii Sp. z o.o. Show all offers
B2B
Hybrid
Senior
Szczecin
Piła
Wrocław
Rzeszów
+10
Expires Sep 26, 2026
22 days ago

In short

Kotlin Developer role in Szczecin. Responsibilities include designing, building, and maintaining microservices, collaborating with teams, and optimizing system performance. Requires 5+ years of experience, Kotlin, distributed systems, microservices, AWS, Kubernetes, PostgreSQL, and JUnit. Offers remote work option, attractive benefits, and development opportunities.

Keywords

Kotlin Microservices AWS Kubernetes PostgreSQL JUnit Software Development System Performance

AI-written summary based on the listing content.

Technologies we use

About the project

Your responsibilities

  • 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 improving the architecture and quality of solutions, and leading the team through technical challenges and migrations

Our requirements

  • Minimum 5 years of professional experience in software development
  • 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
  • Residing in Poland required

Optional

  • 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
  • Proficiency in one of the following front-end technologies: React or TypeScript

What we offer

  • 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
Published 2026-08-27
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