Kotlin Backend Engineer – Fintech Microservices (Remote)

Sii Sp. z o.o.; Toruń; On-site; PLN 140,000 - 190,000; Full time

Benefits offered by this job

Great Place to Work

Private healthcare

Remote work

Car discounts

Training platform

Profit sharing

Job summary

Sii Sp. z o.o. in Toruń is looking for a Regular Kotlin Developer to design, build, and maintain microservices using Kotlin for a modern fintech platform focused on expense management and seamless integration with partner systems.

You will collaborate with cross-functional teams across Platform, Services, and SMB, contribute to reliability and scalability, and participate in code reviews to maintain high quality.

Qualifications

• Minimum 3 years of professional experience in software development.
• Hands-on experience with Kotlin in commercial projects.
• Experience building backend systems and working with microservices architecture.
• Basic experience with cloud environments (e.g., AWS, Kubernetes).
• Experience with relational databases (e.g., PostgreSQL) and testing/observability tools (e.g., JUnit, Grafana).
• Good command of English.
• Residing in Poland required.

Responsibilities

• Designing, building, and maintaining microservices using Kotlin.
• Collaborating with cross-functional teams to deliver solutions across Platform, Services, SMB, and other domains.
• Supporting system performance monitoring and contributing to reliability and scalability improvements.
• Participating in code reviews and maintaining high code quality standards.
• Contributing to continuous improvement of code quality and system architecture.
• Troubleshooting and resolving technical issues.

Skills

Kotlin

AWS

Kubernetes

Microservices

PostgreSQL

JUnit 5

Tools

Grafana

Job description

Sii Sp. z o.o. in Toruń is looking for a Regular Kotlin Developer to design, build, and maintain microservices using Kotlin for a modern fintech platform focused on expense management and seamless integration with partner systems.

You will collaborate with cross-functional teams across Platform, Services, and SMB, contribute to reliability and scalability, and participate in code reviews to maintain high quality.