Sr. Mobile Developer

Salary: $212000 - 260000 per year Requirements: We require an active Secret security clearance or higher. We prefer a bachelors degree in a technical discipline, or equivalent professional experience. We require a certification that satisfies DoD 8140, such as Security+ or above. We need at least 5 years of professional experience developing cross-platform mobile applications for iOS and Android. We look for experience maintaining, integrating, optimizing, and debugging mobile applications in live operational settings. We require experience designing secure mobile architectures, including authentication, authorization, and data protection. We need experience integrating mobile apps with enterprise services and REST APIs. We look for experience supporting mobile device management and secure enterprise mobile rollouts. We need the ability to contribute right away with minimal onboarding in a mission-critical environment. Responsibilities: We design, develop, test, and maintain secure mobile applications using cross-platform frameworks and native iOS/Android technologies. We apply secure coding practices aligned with RMF, STIGs, and secure SDLC principles. We integrate mobile applications with backend APIs, enterprise systems, and identity and access management solutions. We support mobile device management integrations, including Samsung Knox and VMware AirWatch. We take part in Agile ceremonies and sprint delivery to provide mission-critical capabilities. We communicate progress, risks, and technical decisions to our teammates and leadership. We troubleshoot and resolve issues in high-security environments. We contribute to ongoing improvement and technical excellence across our team. Technologies: Android Backend Support Mobile REST Security VMware iOS AI More: We are hiring a Sr. Mobile Developer (Cross-Platform) for a remote role based in Washington, DC. This is a full-time, permanent opportunity with a competitive salary of $180,000 to $220,000 per year on a W2 basis, along with a comprehensive benefits package. We operate in a high-security environment supporting a highly visible federal customer, and our engineering team delivers mission-critical mobile solutions. Halcyon Labs is a strategic consulting firm with nearly 40 years of experience, focused on technology, business advisory, and life sciences solutions. We offer W2 benefits including medical, dental, vision, pre-tax accounts, voluntary life and disability coverage, a 401(k) with match, and sick time where required by law. We are committed to diversity, inclusion, and equal opportunity, and we value transparency in our hiring process. last updated 28 week of 2026