Kotlin Backend Engineer — Fintech Microservices

Sii Poland

Bydgoszcz

On-site

PLN 180,000 - 240,000

Full time

4 days ago

Be an early applicant

Application generator

Get a reply from this employer — a resume and cover letter tailored to exactly what they’re hiring for.

Get past ATS filters

Benefits offered by this job

Private medical care

Professional training

On-site team events

Job summary

Sii Poland is hiring a backend developer to join a modern fintech platform that supports company expense management and seamless integration with banks, accounting tools and HR solutions. You will design, build and maintain Kotlin-based microservices, collaborate with cross-functional teams across Platform, Services and SMB, and contribute to system reliability, scalability and code quality.

Requirements include 3+ years of professional experience, Kotlin in production, PostgreSQL,

Qualifications

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