Kotlin Backend Engineer – Fintech Microservices

Sii Poland; Piła; On-site; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Great Place to Work

Solid financial situation

Contracts with the biggest brands

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Profit sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care

Job summary

Sii Poland is hiring for a fintech platform focused on expense management and integration with banks, accounting platforms, and HR solutions. The role emphasizes building backend microservices with Kotlin, collaborating across multiple domains, and ensuring performance, reliability, and scalability.

The ideal candidate has at least 3 years of experience in software development, hands-on Kotlin, cloud basics, and strong English, with residency in Poland required.

Qualifications

• Minimum 3 years of professional software development experience.

Responsibilities

• Design, build, and maintain microservices using Kotlin.
• Collaborate with cross-functional teams 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

Microservices

Backend development

AWS

Kubernetes

PostgreSQL

JUnit

Grafana

English

Polish residency

Tools

JUnit

Grafana

Job description

Sii Poland is hiring for a fintech platform focused on expense management and integration with banks, accounting platforms, and HR solutions. The role emphasizes building backend microservices with Kotlin, collaborating across multiple domains, and ensuring performance, reliability, and scalability.

The ideal candidate has at least 3 years of experience in software development, hands-on Kotlin, cloud basics, and strong English, with residency in Poland required.