Kotlin Backend Engineer – Fintech, Microservices & AWS

Sii Sp. z o.o.; Szczecin; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Great Place to Work recognition

Private healthcare

Flexible remote work

Job summary

Sii Sp. z o.o. in Szczecin is looking for a Regular Kotlin Developer (f/m/x) to design, build and maintain microservices using Kotlin within a fintech platform that supports company expense management. You will work on backend systems and collaborate with Platform, Services, SMB and other domains.

The role requires hands-on Kotlin experience, cloud familiarity (AWS/Kubernetes), and English language skills, with Poland residency to join a growing team in a global technology company.

Qualifications

• Minimum 3 years of professional software development experience.
• Hands-on Kotlin in commercial projects.
• Experience building backend systems 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 improvements in reliability and scalability
• Participating in code reviews and maintaining high code quality standards
• Contributing to the continuous improvement of code quality and system architecture
• Troubleshooting and resolving technical issues

Skills

English proficiency

Tools

Kotlin

AWS

Kubernetes

PostgreSQL

JUnit 5

Grafana

Job description

Sii Sp. z o.o. in Szczecin is looking for a Regular Kotlin Developer (f/m/x) to design, build and maintain microservices using Kotlin within a fintech platform that supports company expense management. You will work on backend systems and collaborate with Platform, Services, SMB and other domains.

The role requires hands-on Kotlin experience, cloud familiarity (AWS/Kubernetes), and English language skills, with Poland residency to join a growing team in a global technology company.