Senior Mobile-First Full-Stack Engineer — Remote & Flexible

N-iX; Polska; Remote; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Flexible working format

Competitive salary

Career growth

Education reimbursement

Mentorship program

Tech talks and trainings

Active tech communities

Corporate events

Job summary

N-iX is seeking a mobile-first full stack developer to build customer-facing apps and connect them to robust backend services. You will learn Kotlin Multiplatform if needed and leverage AI tools as part of a modern development workflow.

The role emphasizes ownership, collaboration with product and architecture teams, and delivering high-quality, scalable software across platforms. Flexible remote options are available.

Qualifications

• Strong experience in mobile application development.
• Deep understanding of iOS & Android Architecture Components.
• Strong Kotlin skills and modern mobile architecture knowledge.
• Production-grade apps with performance and maintainability.
• Backend experience with Java 7+ and Spring Boot.
• Experience with APIs, microservices and event-driven systems.
• CI/CD, automated testing and production systems.
• Ownership of features from design to production.
• Good communication and cross-team collaboration.

Responsibilities

• Build and improve mobile features used by real customers.
• Develop shared business logic for mobile platforms, mainly Kotlin Multiplatform.
• 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 and documentation.
• Collaborate with product, design, security and platform teams.
• Mentor other developers and help define engineering practices.

Skills

Mobile development

Kotlin

Kotlin Multiplatform

Java/Spring Boot

CI/CD

REST APIs

Cloud AWS

AI-assisted development

Team collaboration

Tools

Kotlin/Java tooling

Spring Boot

AWS

GitHub Copilot

KMP tooling

Job description

N-iX is seeking a mobile-first full stack developer to build customer-facing apps and connect them to robust backend services. You will learn Kotlin Multiplatform if needed and leverage AI tools as part of a modern development workflow.

The role emphasizes ownership, collaboration with product and architecture teams, and delivering high-quality, scalable software across platforms. Flexible remote options are available.