Kotlin Backend Engineer for Fintech Microservices - Remote

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

Benefits offered by this job

Private healthcare

Remote work

Profit sharing

Training platform

Tech blog

Career growth

Job summary

Sii Sp. z o.o. in Warsaw is seeking a Regular Kotlin Developer to design, build, and maintain Kotlin-based microservices within a fintech-oriented platform.

You will collaborate with cross-functional teams to deliver scalable backend solutions and help ensure performance and reliability across services. Ideal candidates have at least 3 years in software development, strong Kotlin experience, and familiarity with cloud services like AWS and Kubernetes.

Qualifications

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

Job description

Sii Sp. z o.o. in Warsaw is seeking a Regular Kotlin Developer to design, build, and maintain Kotlin-based microservices within a fintech-oriented platform.

You will collaborate with cross-functional teams to deliver scalable backend solutions and help ensure performance and reliability across services. Ideal candidates have at least 3 years in software development, strong Kotlin experience, and familiarity with cloud services like AWS and Kubernetes.