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November 3, 2026
Senior Full-Stack Mobile Engineer (Kotlin Multiplatform/Java)
Senior • Remote
7,000 - 7,500 EUR/yr
Warsaw, Poland
Quick Facts
- Role: Senior Full-Stack Mobile Engineer (Kotlin Multiplatform/Java)
Description
Join a team building large-scale digital financial products used by millions and processing real-time financial transactions at high volume. As a Senior KMP Engineer, you will contribute end-to-end across shared Kotlin Multiplatform logic, mobile applications, backend services/APIs, and cloud/production systems. The core stack includes Kotlin, Kotlin Multiplatform (KMP), Java, and Spring Boot.
Responsibilities
- Develop shared business logic across mobile platforms using Kotlin Multiplatform (KMP)
- Design and build backend services and APIs using Java, Kotlin, and Spring Boot
- Build and enhance customer-facing mobile features used by real customers every day
- Work with cloud services, CI/CD, observability, monitoring, and production systems
- Improve scalability, reliability, performance, security, and user experience
- Collaborate with product, design, architecture, security, and platform teams
- Drive engineering excellence through technical leadership, mentoring, and best practices
Requirements
- Strong commercial experience in mobile application development with Kotlin or Kotlin Multiplatform
- Deep understanding of modern Android or iOS architectures and software design principles
- Strong Kotlin skills and experience building production-grade applications
- Some backend development experience with Java, Spring Boot, APIs, and microservices
- Familiarity with distributed systems, event-driven architectures, and modern engineering practices
- Experience with CI/CD, automated testing, and production environments
- Ability to take end-to-end ownership of features from design through production
- Strong communication and collaboration skills
Benefits
- Cafeteria benefits package (including private healthcare or a Multisport card)
- Access to learning and language training platforms
- Company events and birthday celebrations
- MacBook as your primary work device
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