Lead Kotlin Multiplatform Developer

N-iX; Madrid; A distancia; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A global software development service company is seeking a Senior Mobile Developer to lead a Kotlin Multiplatform project. You will own the architecture and collaborate with teams to ensure technical excellence for both iOS and Android platforms. The ideal candidate has extensive experience in mobile development, particularly with Kotlin Multiplatform, and strong leadership skills in a Scrum environment. This role offers flexibility and competitive compensation.

Servicios

Flexible working format

Competitive salary

Personalized career growth

Professional development tools

Active tech communities

Education reimbursement

Anniversary presents

Corporate events and team buildings

Formación

• 7 years of experience in mobile app development, with at least 3 years in Kotlin Multiplatform (KMP).
• Experience in high-level product estimation and roadmap development.
• Proven record of delivering production-grade mobile applications for both iOS and Android using KMP.
• Expertise in Android (Jetpack Compose) and iOS (Swift / SwiftUI).
• Hands-on experience building CI / CD pipelines and managing app releases.

Responsabilidades

• Own the architecture and technical roadmap for the mobile product.
• Lead and mentor a small cross-functional mobile team.
• Define clean modular architecture using modern patterns.
• Make key technical decisions on frameworks and tools.
• Collaborate with backend engineers to define efficient API contracts.

Conocimientos

Kotlin Multiplatform (KMP)

Mobile app development

iOS development

Android development

CI / CD pipelines

Bluetooth / BLE protocols

Documentation

Performance tuning

Herramientas

Ktor Client

SQLDelight

GitHub Actions

Bitrise

Fastlane

Jenkins

Descripción del empleo

N-iX is a global software development service company that helps businesses across the globe create next-generation software products. Founded in 2002 we unite 2400 tech-savvy professionals across 40 countries working on impactful projects for industry leaders and Fortune 500 companies. Our expertise spans cloud data AI / ML embedded software IoT and more driving digital transformation across finance manufacturing telecom healthcare and other industries. Join N-iX and become part of a team where your ideas make a real impact.

About the Client

Our customer is a leading provider of onboard retail technology and mobile solutions for the travel and retail industries. The company designs and builds digital products that transform how airlines trains and retailers manage in-motion sales inventory and customer experiences. We are forming a dedicated Kotlin Multiplatform (KMP) team to build a new cross-platform mobile application from the ground up - one codebase two native experiences : iOS and Android.

Youll lead a small highly capable Scrum team (engineers QA designer) collaborate closely with backend and product teams and establish technical excellence in the mobile domain.

Responsibilities

• Own the architecture and technical roadmap for a new Kotlin Multiplatform (KMP) mobile product that powers both iOS and Android.
• Estimate MVP development and other product phases.
• Define clean modular architecture using modern patterns (Clean Architecture / MVI / MVVM / modularization).
• Lead and mentor a small cross-functional mobile team; perform code reviews and ensure adherence to best practices.
• Design and implement shared business logic and platform-specific layers ensuring native UX and optimal performance.
• Make key technical decisions on frameworks libraries CI / CD tools and delivery processes.
• Drive cross-platform UI strategy (Compose Multiplatform Jetpack Compose SwiftUI integration).
• Collaborate with backend engineers to define efficient API contracts (REST / GraphQL).
• Establish and maintain automated build testing and release pipelines for Android and iOS.
• Ensure robust app security observability and performance monitoring across both platforms.
• Promote engineering excellence : documentation testing culture DevOps alignment and continuous improvement.
• Act as a technical liaison between product management and engineering translating business goals into scalable mobile solutions.

Must-Have Skills

• 7 years of experience in mobile app development with at least 3 years in Kotlin Multiplatform (KMP)
• Experience in high-level product estimation and roadmap development.
• Proven record of delivering production-grade mobile applications for both iOS and Android using KMP.
• Deep understanding of Kotlin (coroutines flows multiplatform libraries shared data models serialization).
• Expertise in Android (Jetpack Compose) and iOS (Swift / SwiftUI) with a strong grasp of platform internals and performance tuning.
• Experience with device-to-device communication protocols especially Bluetooth / BLE .
• Strong architectural mindset experienced in designing scalable testable modular architectures.
• Proficiency with Ktor Client SQLDelight or similar for data and networking layers.
• Experience in offline-first architectures synchronization logic and push notifications.
• Hands-on experience building CI / CD pipelines (GitHub Actions Bitrise Fastlane Jenkins) and managing app releases (Play Store App Store).
• Solid understanding of security performance and offline-first mobile patterns.
• Demonstrated ability to lead teams perform technical reviews and mentor developers.
• Excellent communication and collaboration skills; comfortable working with international teams.
• Knowledge of observability stacks (Crashlytics Firebase Sentry).
• Professional fluency in English.
• Available for business trips to the customer side

Would be a plus

• Experience of mesh networking protocols and device-to-device communication.

We offer

• Flexible working format - remote office-based or flexible
• A competitive salary and good compensation package
• Personalized career growth
• Professional development tools (mentorship program tech talks and trainings centers of excellence and more)
• Active tech communities with regular knowledge sharing
• Education reimbursement
• Memorable anniversary presents
• Corporate events and team buildings
• Other location-specific benefits
• not applicable for freelancers

Key Skills: Administrative Skills,Facilities Management,Biotechnology,Creative Production,Design And Estimation,Architecture

Employment Type: Full Time

Experience: years

Vacancy: 1