Kotlin Backend Engineer | Fintech Microservices

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

Benefits offered by this job

Great Place to Work

Private healthcare

Flexible work options

Career development

Global projects

Job summary

Sii Sp. z o.o. in Poznań is looking for a Regular Kotlin Developer (f/m/x) to join a fintech platform team building modern microservices in Kotlin.

You will design, build, and maintain backend services, collaborate across Platform, Services and SMB domains, and contribute to reliability, performance monitoring, and scalable architectures using AWS, Kubernetes, PostgreSQL, and JUnit. English communication is required.

Qualifications

• Minimum 3 years of professional software development experience.
• Hands-on experience with Kotlin in commercial projects.
• Experience building backend systems and 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 is required.

Responsibilities

• Design, build, and maintain microservices using Kotlin.
• Collaborate with cross-functional teams across Platform, Services, SMB, and other domains.
• Support system performance monitoring and contribute to reliability and scalability improvements.
• Participate in code reviews and maintain high code quality standards.
• Contribute to continuous improvement of code quality and system architecture.
• Troubleshoot and resolve technical issues.

Skills

Kotlin

Backend development

Microservices

Cloud experience

PostgreSQL

JUnit

Grafana

English

Tools

AWS

Kubernetes

Job description

Sii Sp. z o.o. in Poznań is looking for a Regular Kotlin Developer (f/m/x) to join a fintech platform team building modern microservices in Kotlin.

You will design, build, and maintain backend services, collaborate across Platform, Services and SMB domains, and contribute to reliability, performance monitoring, and scalable architectures using AWS, Kubernetes, PostgreSQL, and JUnit. English communication is required.