Fullstack Mobile Developer

Senior Full-Stack Mobile Developer💰 Salary: $50/hour on B2B💻 100% RemoteWe're looking for a Senior Full Stack Mobile Developer for an international technology group delivering large-scale digital solutions to the financial sector. Their engineering organization is moving toward smaller teams with broader ownership, more code sharing across mobile platforms, and pragmatic use of AI in everyday development. You'd join the group behind customer-facing banking products - working across the app itself, the logic shared between mobile platforms, and the services and infrastructure that power it.Working stack: Kotlin, Kotlin Multiplatform, Java, Spring Boot, AWS, Kafka.A senior individual contributor role with real end-to-end scope. You'll carry features from technical design through release and production support, and help shape how mobile architecture and shared code evolve across the team.Requirements:Solid track record of shipping production mobile applications, with a deep grasp of Android and iOS architecture componentsAdvanced Kotlin skills and command of modern mobile architecture patternsHands-on backend development with Java 7+ (or Kotlin) and Spring Boot, building REST APIsFamiliarity with microservices, distributed systems, and event-driven designPractical experience with CI/CD, automated testing, and operating production systemsComfort owning a feature end-to-end - from design through deployment and beyondStrong communication skills and experience collaborating across product, design, security, and platform teamsDay-to-day use of AI coding assistants (Copilot, Cursor, Claude Code, or similar), paired with critical review of generated output for quality, security, and performanceFluent written and spoken EnglishNice to Have:Kotlin Multiplatform in production - a strong advantageFlutter or React Native background, with willingness to pick up KMPKafka or comparable event-streaming technologiesAWS or another major cloud platformFintech, banking, payments, or other regulated-industry experienceApple Pay, Google Pay, or wallet/payment integrationsModular mobile architecture or shared SDKs/librariesObservability, performance profiling, and production incident analysisExperience working with specs, examples, and tests as the driver of implementationKey Responsibilities:Design, build, and refine mobile features used by a large customer baseDevelop shared cross-platform business logic, primarily with Kotlin MultiplatformBuild and maintain backend services and APIs in Java/Kotlin with Spring BootContribute to cloud infrastructure, delivery pipelines, monitoring, and production supportApply AI tooling across the development lifecycle - code, tests, documentation, debugging - while holding a high bar for quality, security, and maintainabilityCollaborate closely with product, design, architecture, security, and platform teamsMentor other engineers and help define team-wide engineering practicesContinuously improve performance, reliability, security, and user experience