Jobs at ExistX

Develop high-performance backend services and mission-critical software for cleared operational environments. Responsibilities include translating research designs into software, designing scalable systems, collaborating with technical experts, mentoring developers, shaping architectures and roadmaps, and maintaining technical documentation. The role requires strong backend programming skills, enterprise software experience, and active TS/SCI clearance with full-scope polygraph. Work requires onsite presence at client locations in Maryland, with hybrid arrangements determined by contract and security needs.

Coordinate government security accreditation and certification activities for cryptographic devices and embedded aircraft systems. Serve as a technical liaison among government agencies, prime contractors, and engineering teams; review security designs and deficiencies; support COMSEC key-management processes; develop and assess test plans; guide systems through ATO and DoD RMF processes; and perform hardware and software security assessments for embedded and cyber-physical systems.

The HR Generalist manages employee relations, recruiting, onboarding and offboarding, HR policies, benefits, HRIS records, performance programs, and workforce planning. The role supports cleared DoW/DoD and Intelligence Community employees, ensuring compliance with employment laws, contract requirements, FAR/DFARS obligations, and security-related processes. Responsibilities also include advising managers, handling confidential matters, supporting audits and organizational change, and analyzing HR metrics. The position partners with leadership, Security, Legal, and program teams.