Join to apply for the Senior Android Engineer, Bitkey role at Block Join to apply for the Senior Android Engineer, Bitkey role at Block Get AI-powered advice on this job and more exclusive features. Proto is accelerating the world's transition to an open economy with products that increase access and independence for everyone. We're building Bitkey, a simple and safe self-custody bitcoin wallet that will put customers in control, as well as hardware and software that will help decentralize bitcoin mining and enable new and innovative use cases for bitcoin mining. We're developing these products in the open - you can read more about them at bitkey.build and mining.build. Within Proto, our Bitcoin Products team delivers the product and go-to-market strategy, software, firmware, and custom silicon needed to make Bitkey and our ambitious mining initiatives a reality. Come build the future of money with us! The Role Bitkey is a self-custody Bitcoin wallet designed to bring financial ownership to a global audience. We are a small, high-impact team within the Proto organization at Block, working in the open to advance the principles of Bitcoin—individual sovereignty, decentralization, and permissionless access to money. We're looking for a Senior Android Engineer to help scale our Kotlin Multiplatform (KMP) architecture and deliver new product experiences that empower people to own and control their money. In this role, you'll bring deep mobile expertise—either in Android or KMP—and help shape the evolution of our multiplatform codebase and delivery pipeline. You'll collaborate across design, product, and backend teams to ship features end-to-end, from architecture to post-launch observability and iteration. We are looking for an engineer who thrives on building trustworthy, user-first experiences—and who's excited about the technical challenges of delivering a product where security and reliability are critical, to people around the world. You Will Work across disciplines to ship critical features across Android and iOS using Kotlin Multiplatform Join architecture and platform evolution discussions to improve the developer ergonomics of our mobile codebase, and to enhance its testability, performance, and security Mentor and collaborate with mobile engineers across the team to raise the bar on design, code quality, and system resilience Extend and improve our mobile CI/CD pipeline and build infrastructure, with a focus on reliability, automation, and developer experience You Have 8+ years of experience in Android development Deep experience architecting Android applications at scale and/or strong experience with Kotlin Multiplatform in production Interest in contributing to the design and evolution of multi-platform codebases and development patterns Familiarity with modern Android build systems and tooling such as Gradle, CI/CD automation, performance tuning, and static analysis tools Experience collaborating with backend teams to design robust, scalable mobile APIs Passion for financial empowerment and an interest in Bitcoin, decentralized technologies, or digital identity Interest in exploring and applying AI tools to improve mobile development workflows and in helping define best practices for integrating them into our mobile engineering pipeline Technologies We Use and Teach Kotlin & Kotlin Multiplatform Compose Multiplatform Swift SQLite / SQLDelight Rust We're working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis. We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know. Want to learn more about what we're doing to build an inclusive workplace? Check out our Inclusion & Diversity page . Block takes a market-based approach to pay, and pay may vary depending on your location. U.S. locations are categorized into one of four zones based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future. To find a location’s zone designation, please refer to this resource. If a location of interest is not listed, please speak with a recruiter for additional information. Zone A
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