Senior Software Engineer (Mobile Fullstack) at Butterflymx

OUR MISSION: ButterflyMX is on a mission to empower people to open and manage doors & gates from a smartphone. Our products are installed in more than 20,000+ multifamily, commercial, gated communities, and student-housing properties worldwide, including properties developed, owned, and managed by the most trusted names in real estate. Our features are designed for developers, owners, property managers, and tenants and our products lower operating costs and improve tenant satisfaction. OUR SOLUTION: Developers and owners no longer need to run building wiring or install in-unit hardware. Property managers can grant building access, revoke permissions, and review entry logs from an online dashboard. Residents can open doors from their smartphones, issue visitor access, and see who is trying to enter the building. OUR CULTURE & VALUES: Fantastic people are the key to our success. As a distributed, primarily remote workforce, we’re looking for more intelligent, passionate, collaborative, ai-forward, and down-to-earth individuals to join our growing team. We’re driven by a shared commitment to excellence and innovation, grounded in our core values: We delight our customers, We take ownership, We are a community of collaborators, We speak up, We think big and do small, and We are tenacious. RESPONSIBILITIES: - Partner with Product, Design, and other Engineering teams to help design, build, and evolve the APIs, services, and mobile applications that power our products - Architect and build high-performance, cross-platform mobile applications for iOS and Android using React Native, delivering a native-quality user experience from a shared codebase - Lead large-scale projects from ideation to launch with a customer-first mindset, spanning both mobile and backend layers - Design, build, and maintain efficient, reusable, reliable, and testable code across the full stack - Integrate with native device capabilities (push notifications, Bluetooth/NFC for access control, camera, GPS) using native modules and bridging where necessary - Identify bottlenecks and bugs across mobile and backend systems, devise solutions and propose optimizations for performance, reliability, and user experience - Work comfortably across front-end, mobile, and back-end layers of the architecture - Implement patterns and systems allowing for independently deployable full-stack services at a level of granularity appropriate for team composition and business value - Own the mobile build and release pipeline, including App Store and Google Play submission processes, code signing, and over-the-air update strategies - Help maintain code quality, organization, and automatization - Write new and improve current documentation - Lead by example for other members of the team as a dedicated, passionate, and flexible technologist who is constantly striving to improve code quality, design, and system architecture - Help define, document, evolve, and evangelize high engineering standards and best practices across mobile and backend development REQUIREMENTS: - 5+ years of professional development experience - 4+ years of professional development experience in TypeScript, JavaScript - 2+ years of hands-on experience building and shipping production React Native applications on both iOS and Android - Strong understanding of React Native internals, navigation patterns (React Navigation), and state management (Redux, Zustand, or similar) - Experience with mobile app distribution workflows: App Store Connect, Google Play Console, code signing, TestFlight, and OTA updates (e.g., CodePush or EAS Update) - Strong experience with automated CI/CD pipelines, including mobile-specific CI - Strong experience working in and advocating for Agile environments - Deep understanding of testing and what, when, and how to test, including mobile-specific testing strategies (Jest, Detox, or Appium for E2E) - Extensive experience with developing and maintaining APIs, as well as integrating with 3rd party APIs - Hands-on experience working in a Distributed/Cloud-based environment (e.g. Amazon EC2/ECS, Lambdas, No-SQL DB, Azure, etc.) within a service-oriented architecture - Experience working with relational databases and writing SQL queries - Excellent verbal and written communication and collaboration skills to effectively communicate with both business and technical teams - Comfortable working in a fast-paced, results-oriented environment - Experience with the following: GraphQL, IoT device development - Motivated by the desire to learn and collaborate, to own and improve, and to focus on what helps the business succeed - Well versed in the disciplines of security, reliability, and scalability - Well versed with Agile methodology and who believes in the value of a well written and appropriately defined user story - User-focused with a keen sense of how your code will impact the user’s experience in terms of performance, security, and usability — especially on mobile where latency, battery life, and offline resilience directly affect user trust - Passionate about frequent value delivery through collaboration with product owners, preferring MVPs and tight build-measure-learn loops to maximize value - Someone who truly cares about leading and mentoring engineers - Proven experience with leveraging AI tools in both professional and personal settings. ButterflyMX is an AI-forward organization and the ability to optimize efficiency using AI is crucial in every role. NICE TO HAVE: - Experience with Bluetooth Low Energy (BLE) or NFC integrations for physical access control or IoT - Open-minded approach to choosing the right tool for the job - Familiarity with real-time communication protocols (WebSockets) for device-to-app interaction - Experience with React Native performance profiling tools (Flipper, Hermes, React DevTools) - Contributions to or experience with React Native’s New Architecture (Fabric, TurboModules) BENEFITS - Comprehensive Medical, Dental and Vision plans (ButterflyMX covers 80% of the cost) starting day 1 - 401(k) plan with a match - 10 paid holidays, 20 vacation days, 5 sick days, 3 floating holidays - Basic Life and Accidental Death and Dismemberment Insurance (ButterflyMX covers 100% of the cost) - Short and Long Term Disability (ButterflyMX covers 100% of the cost) - Paid Family Leave - Employee Assistance Program - Quarterly self-care stipends - Access to optional benefits including pre-tax flexible healthcare spending accounts (FSA and HSA), Dependent Care FSA, and Commuter Benefits, as well as optional Supplemental Life, AD&D, Hospital Indemnity, Legal, Accident, Critical Illness, Pet, and Personal Liability Insurance - And more! ButterflyMX is an equal opportunity employer and we value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. You must have the authorization to work in the US to become an employee. We strive to create an accessible and inclusive experience for all candidates and employees. If you need reasonable accommodations during the application or the recruiting process, please let our recruiting team know.