Senior Kotlin Engineer - Fintech Microservices (Remote)

Sii Sp. z o.o.; Kraków; On-site; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Great Place to Work

Private healthcare

Remote work option

Profit sharing

Job summary

Sii Sp. z o.o. in Kraków is seeking a Kotlin Developer (f/m/x) to design, implement and maintain scalable microservices using Kotlin, AWS, and cloud-native patterns.

You will collaborate with cross-functional teams across Platform, Services, and SMB to deliver robust fintech solutions and integrations with banks, accounting platforms, and HR tools. The role emphasizes mentoring, code reviews, and performance tuning to ensure reliability and scalability, with English proficiency and 5+ years of

Qualifications

• 5+ years of professional software development experience.
• Expertise in server-side languages, especially Kotlin, and distributed systems/microservices.
• Experience with cloud environments (AWS) and Kubernetes.
• Proficiency with PostgreSQL, testing tools (JUnit, Testcontainers), and observability (Grafana).
• Strong problem solving and collaboration; able to mentor teammates.

Responsibilities

• Lead design, build, and maintenance of scalable microservices using Kotlin.
• Collaborate with cross-functional teams across Platform, Services, SMB, and others.
• Analyze performance and implement optimizations for reliability and scalability.
• Participate in code reviews, post-mortems, and mentor engineers.
• Drive architectural improvements and migrations.

Skills

Kotlin

AWS

Microservices

Kubernetes

Tools

React.js

TypeScript

Job description

Sii Sp. z o.o. in Kraków is seeking a Kotlin Developer (f/m/x) to design, implement and maintain scalable microservices using Kotlin, AWS, and cloud-native patterns.

You will collaborate with cross-functional teams across Platform, Services, and SMB to deliver robust fintech solutions and integrations with banks, accounting platforms, and HR tools. The role emphasizes mentoring, code reviews, and performance tuning to ensure reliability and scalability, with English proficiency and 5+ years of