Kotlin Backend Engineer for Fintech Microservices

Sii Poland

Warszawa

On-site

PLN 180,000 - 240,000

Full time

4 days ago
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Benefits offered by this job

Great Place to Work
Profit sharing
Centre of internal trainings
Many experts you can learn from
Open and accessible management team
Regular integration events and trips
Comfortable and well-equipped offices
MySii app
Medical care

Job summary

Sii Poland is seeking a Kotlin backend developer to design, build, and maintain microservices for a modern fintech platform in Warsaw. You will collaborate with cross-functional teams across Platform, Services, SMB, and other domains to deliver scalable backend solutions.

The role requires at least 3 years of professional software development experience, with hands-on Kotlin, cloud (AWS/Kubernetes), and PostgreSQL expertise. Excellent English is essential; Poland residency is required.

Qualifications

  • 3+ years of professional software development experience.
  • Proficient with Kotlin in commercial projects.
  • Experience building backend systems with microservices.
  • Knowledge of cloud environments (AWS, Kubernetes) preferred.
  • Experience with relational DB (PostgreSQL) and testing/observability tools (JUnit, Grafana).
  • Strong command of English and residing in Poland 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
Microservices
Backend development
AWS/Kubernetes
PostgreSQL
JUnit/Grafana
English

Tools

AWS
Kubernetes
PostgreSQL
JUnit
Grafana

Job description

Sii Poland is seeking a Kotlin backend developer to design, build, and maintain microservices for a modern fintech platform in Warsaw. You will collaborate with cross-functional teams across Platform, Services, SMB, and other domains to deliver scalable backend solutions.

The role requires at least 3 years of professional software development experience, with hands-on Kotlin, cloud (AWS/Kubernetes), and PostgreSQL expertise. Excellent English is essential; Poland residency is required.

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