Senior Mobile & Full-Stack Engineer (KMP, AI)

N-iX; Poland; Hybrid; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Flexible working format

Competitive salary

Mentorship program

Tech talks & trainings

Job summary

N-iX in Poland is seeking a Senior Full Stack Mobile Developer to join Clint`s team. You will craft modern mobile products end‑to‑end—from app UX to backend services and cloud integration—while embracing AI tools to accelerate delivery and learning.

You will work across mobile app, shared logic, backend services and production systems, contributing to high‑quality, scalable fintech-like products and collaborating with cross‑functional teams to improve engineering practices.

Qualifications

• Strong experience in mobile application development.
• Experience with cross‑platform frameworks (KMP, Flutter, React Native).
• Knowledge of Kotlin Multiplatform architecture and best practices.

Responsibilities

• Build and improve mobile features used by real customers.
• Develop shared business logic for mobile platforms, mainly using Kotlin Multiplatform (KMP).
• Build backend services and APIs using Java/Kotlin and Spring Boot.
• Work with cloud services, CI/CD pipelines, monitoring and production support.
• Improve performance, reliability, security and user experience.
• Use AI coding tools to help with development, testing, documentation and troubleshooting.
• Work closely with product, design, architecture, security and platform teams.
• Help define good engineering practices and mentor other developers.

Skills

Kotlin Multiplatform

Mobile development

Kotlin

iOS Architecture Components

Android Architecture Components

Java/Kotlin backend

CI/CD

AI tools

Team collaboration

Spring Boot

Tools

Spring Boot

Kafka

AWS

Job description

N-iX in Poland is seeking a Senior Full Stack Mobile Developer to join Clint`s team. You will craft modern mobile products end‑to‑end—from app UX to backend services and cloud integration—while embracing AI tools to accelerate delivery and learning.

You will work across mobile app, shared logic, backend services and production systems, contributing to high‑quality, scalable fintech-like products and collaborating with cross‑functional teams to improve engineering practices.