Senior Kotlin Microservices Lead – Fintech (Remote)

Sii Sp. z o.o.; Katowice; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Great Place to Work since 2015

Private healthcare

Benefits cafeteria platform

Car discounts

Remote work

Job summary

Sii Sp. z o.o. in Katowice is hiring a Kotlin Developer to join a fintech platform that supports company expense management.

You will design, build, and maintain scalable microservices using Kotlin while collaborating with cross‑functional teams across Platform, Services, SMB, and other domains. The role emphasizes reliability and performance, code quality via reviews and migrations, and mentoring of teammates.

Qualifications

• 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

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

Skills

Kotlin

AWS

Microservices

Kubernetes

React.js

TypeScript

Tools

Kotlin

AWS

Microservices

Kubernetes

React.js

TypeScript

Job description

Sii Sp. z o.o. in Katowice is hiring a Kotlin Developer to join a fintech platform that supports company expense management.

You will design, build, and maintain scalable microservices using Kotlin while collaborating with cross‑functional teams across Platform, Services, SMB, and other domains. The role emphasizes reliability and performance, code quality via reviews and migrations, and mentoring of teammates.