Senior Full Stack Mobile Developer

About the Position

N-iX is a global technology company that helps industry-leading companies and Fortune 500 firms build software products and scalable engineering solutions. We are currently looking for a Senior Full Stack Mobile Developer to join our client's team. The ideal candidate will build modern mobile products end-to-end: from the mobile app experience to backend services, APIs, cloud services, and production quality. This role is for someone who enjoys solving real product problems, writing clean code, learning new technologies, and using AI tools to work faster and better.

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.

Requirements

• Strong experience in mobile application development.
• Deep understanding of iOS & Android Architecture Components.
• Strong Kotlin skills and good understanding of modern mobile architecture.
• Experience building production-grade apps with good quality, performance, and maintainability.
• Backend development experience with Java 7+ and Spring Boot.
• Understanding of APIs, microservices, and event-driven systems.
• Experience with CI/CD, automated testing, and production systems.
• Ability to take ownership of a feature from design to production.
• Good communication skills and ability to work with multiple teams.

Nice to Have

• Experience in fintech, banking, payments, or other regulated environments.
• Experience with Apple Pay, Google Pay, or wallet/payment integrations.
• Experience building modular mobile apps or shared SDKs/libraries.
• Experience with observability, performance profiling, and production incident analysis.

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.

About the Company

N-iX is a global technology company that helps industry-leading companies and Fortune 500 firms build software products and scalable engineering solutions. Since 2002, we’ve become a team of 2,400+ tech professionals working across 40+ countries worldwide, now actively growing in LATAM. With our office in Medellín and a 100+ strong tech community in the region, we offer flexible work options, global collaboration, room to grow, and opportunities to contribute to meaningful global projects.