Kotlin Backend Engineer for Fintech Microservices

Sii Poland; Katowice; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Great Place to Work

Solid financial situation

Contracts with big brands

Centre of internal trainings

Many experts to learn from

Profit sharing

MySii app

Medical care

Job summary

Sii Poland is hiring for a backend-focused role on a modern fintech platform in Katowice. You will design, build, and maintain Kotlin-based microservices, collaborating across Platform and Services domains to deliver scalable solutions.

The ideal candidate has 3+ years of experience, solid Kotlin skills, and a good understanding of cloud environments, PostgreSQL, and observability tools. English proficiency and Polish residency are required.

Qualifications

• 3+ years of professional software development.
• Hands-on Kotlin experience in commercial projects.
• Experience building backend systems and microservices.
• Basic cloud experience (AWS, Kubernetes).
• Proficiency with PostgreSQL and testing/observability tools (JUnit, Grafana).
• Good command of English and Poland residency.

Responsibilities

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

Skills

Kotlin

Backend development

Microservices

Cloud (AWS/Kubernetes)

PostgreSQL

Testing/Observability (JUnit, Grafana)

English

Tools

Kubernetes

JUnit

Grafana

Job description

Sii Poland is hiring for a backend-focused role on a modern fintech platform in Katowice. You will design, build, and maintain Kotlin-based microservices, collaborating across Platform and Services domains to deliver scalable solutions.

The ideal candidate has 3+ years of experience, solid Kotlin skills, and a good understanding of cloud environments, PostgreSQL, and observability tools. English proficiency and Polish residency are required.