Kotlin Backend Engineer – Fintech Microservices, AWS

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

Benefits offered by this job

Great Place to Work

Centre of internal trainings

Profit sharing

Medical care

Office in Poland

Job summary

Sii Poland is seeking an experienced backend engineer to design, build and maintain microservices using Kotlin. You will collaborate with cross-functional teams across multiple domains and help improve reliability and scalability of our fintech platform.

The role requires strong code quality standards and hands-on cloud experience. You will work on integrating financial tools and payments-related features, with opportunities to learn from a broad team of experts and contribute to a diverse,

Qualifications

• 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).

Responsibilities

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

Backend development

Microservices

English

Software design

Tools

AWS

Kubernetes

PostgreSQL

JUnit

Grafana

Job description

Sii Poland is seeking an experienced backend engineer to design, build and maintain microservices using Kotlin. You will collaborate with cross-functional teams across multiple domains and help improve reliability and scalability of our fintech platform.

The role requires strong code quality standards and hands-on cloud experience. You will work on integrating financial tools and payments-related features, with opportunities to learn from a broad team of experts and contribute to a diverse,