Senior Android Engineer - FTC

We are looking for a Senior Android Engineer to join a small, single-threaded mission team that builds new business-calling capabilities into a mobile calling app. You will work in Kotlin, move quickly, test ideas with real users, and use AI tools as a normal part of how you build. Android depth matters most. You also need to be willing to work in an agentic way and to communicate clearly with product, QA and backend colleagues. ** Please note this is a 6 month fixed-term contract THE CLIENT AND THE PROJECT Growing the business side of a calling app Our client is an international calling company with a mobile app for consumers and small businesses. Its product and engineering team is small and spread across more than one location. The mission is to grow the business-customer side of the product. The mission team will improve existing business features and add new ones to the core mobile app over roughly the next two quarters, working closely with a client backend engineer and the client's engineering, product and revenue leaders. Android is built first; iOS follows later. Roadmap the engineer will work against First quarter : a more tailored app experience for business users, spending limits and top-ups, balance alerts and automatic top-ups, in-app, push and email messaging, and the design of shared business accounts. Second quarter: build of shared business accounts, usage history and reporting, support for several numbers, invoicing, and a web-based version of the calling f