Fullstack Mobile Developer

Salary: $50/hour on B2B
Remote: 100%

Description

Join an international technology group delivering large-scale digital solutions for the financial sector. The engineering organization is moving toward smaller teams with broader ownership, more code sharing across mobile platforms, and pragmatic use of AI in everyday development.

Work on customer-facing banking products across the mobile application, logic shared between mobile platforms, and the services and infrastructure that support them. This is a senior individual contributor role with end-to-end scope, from technical design through release and production support, while helping evolve mobile architecture and shared code.

Working Stack

• Kotlin
• Kotlin Multiplatform
• Java
• Spring Boot
• AWS
• Kafka

Requirements

• Solid track record of shipping production mobile applications and deep knowledge of Android and iOS architecture components
• Advanced Kotlin skills and command of modern mobile architecture patterns
• Hands-on backend development with Java 7+ or Kotlin and Spring Boot, building REST APIs
• Familiarity with microservices, distributed systems, and event-driven design
• Practical experience with CI/CD, automated testing, and operating production systems
• Ability to own a feature end-to-end, from design through deployment and beyond
• Strong communication skills and experience collaborating with product, design, security, and platform teams
• Daily use of AI coding assistants, such as Copilot, Cursor, Claude Code, or similar, with critical review of generated output for quality, security, and performance
• Fluent written and spoken English

Nice to Have

• Kotlin Multiplatform in production
• Flutter or React Native background and willingness to learn Kotlin Multiplatform
• Kafka or comparable event-streaming technologies
• AWS or another major cloud platform
• Fintech, banking, payments, or other regulated-industry experience
• Apple Pay, Google Pay, or wallet/payment integrations
• Modular mobile architecture or shared SDKs/libraries
• Observability, performance profiling, and production incident analysis
• Experience working with specifications, examples, and tests as drivers of implementation

Key Responsibilities

• Design, build, and refine mobile features used by a large customer base
• Develop shared cross-platform business logic, primarily with Kotlin Multiplatform
• Build and maintain backend services and APIs in Java/Kotlin with Spring Boot
• Contribute to cloud infrastructure, delivery pipelines, monitoring, and production support
• Apply AI tooling across code, tests, documentation, and debugging while maintaining quality, security, and maintainability
• Collaborate with product, design, architecture, security, and platform teams
• Mentor engineers and help define team-wide engineering practices
• Continuously improve performance, reliability, security, and user experience