Regular Kotlin Developer (f/m/x)

Sii Poland

Kraków

On-site

PLN 180,000 - 240,000

Full time

8 days ago

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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 backend-focused role on a modern fintech platform in Kraków. You will design, build, and maintain microservices in Kotlin and collaborate with cross-functional teams across Platform, Services, SMB, and other domains.

You'll work on performance monitoring, reliability, and scalability enhancements, participate in code reviews, and help raise overall code quality and system architecture. English proficiency is required; residency in Poland is mandatory.

Qualifications

At least 3 years of professional software development experience.
Hands-on Kotlin in commercial projects required.
Experience building backend systems and microservices is essential.
Basic experience with cloud environments (e.g., AWS, Kubernetes).
Experience with relational databases (PostgreSQL) and with testing/observability tools (JUnit, Grafana).
Good command of English; resident 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 improvements in code quality and system architecture.
Troubleshoot and resolve technical issues as they arise.

Skills

Kotlin

Backend development

Microservices architecture

Cloud environments

Relational databases

Testing & observability

English

Tools

JUnit

Grafana

PostgreSQL

AWS

Kubernetes

Job description

Join a team working on a modern fintech platform that supports company expense management.

The project focuses on developing a finance solution that enables seamless integration of financial tools (including payment cards, expense management, and invoice handling) directly into partner systems such as banks, accounting platforms, and HR solutions. The product allows companies to simplify financial processes, automate settlements, and gain full real-time control over their spending.

Your tasks

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

Requirements

Minimum 3 years of professional experience in software development
Hands-on experience with Kotlin in commercial projects
Experience building backend systems and working with microservices architecture
Basic experience with cloud environments (\"e.g., AWS, Kubernetes\")
Experience with relational databases (\"e.g., PostgreSQL\") as well as testing and observability tools (\"e.g., JUnit, Grafana\")
Good command of English
Residing in Poland required

Job no. JOB-R7LMQ

Sii ensures that all hiring decisions are made solely on the basis of qualifications and competence. We are committed to equal and fair treatment of all, regardless of legally protected characteristics. At Sii, we promote a diverse and inclusive work environment, in full compliance with applicable anti-discrimination laws.

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