Marksman Security Jobs

Johns Hopkins Applied Physics Laboratory (APL) seeks a Senior NLCC Communication Systems Engineer to lead design, analysis, and integration of advanced communications systems supporting Nuclear Command, Control, and Communications (NC3) and related national security missions. You will architect robust end-to-end links, perform modeling and simulati...

Johns Hopkins Applied Physics Laboratory (APL) seeks a Senior Wireless Signal Processing Engineer to develop cutting-edge algorithms and architectures for RF and wireless systems supporting national security, space, and health missions. You will design and simulate advanced waveforms, detection and estimation algorithms, and robust communications i...

Johns Hopkins Applied Physics Laboratory (APL) seeks an Electromagnetic Modeling & Simulation Engineer to develop and apply advanced EM models supporting national security, space, and health missions. In this role, you will design and run high-fidelity simulations of RF systems, antennas, scattering, and propagation using state-of-the-art tools, an...

Mastercard seeks a Site Reliability Engineer I to support reliable, scalable software platforms in a dynamic, innovation-driven environment. In this entry-level role, you will help design, automate, and monitor infrastructure and applications, ensuring performance, availability, and security. You'll work closely with engineering teams to build CI/C...

Mastercard is seeking a Site Reliability Engineer II to enhance the reliability, scalability, and performance of critical IT systems. In this role, you will design and implement robust monitoring, automation, and incident response processes to support innovative, user focused software products. You will collaborate closely with development and infr...

Date Posted:2026-09-25Country:United States of America Location:US-MA-MARLBOROUGH-MA2 1001 Boston Post Rd BLDG 2 Position Role Type:Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are...

Are you a software development engineer who wants to build the systems that hundreds of thousands of AWS customers rely on to keep their cloud environments secure and compliant? The AWS Config Rules Platform team is looking for an SDE to work on the core evaluation engine that continuously assesses millions of resources across thousands of account...

Description: CarShield is seeking an experienced Network Engineer to join its growing Infrastructure team. In this role, you will design, implement, monitor, and manage the organization's local and wide area networks, helping maintain secure, reliable connectivity and maximum availability for users across the business.In this role, you will:Design ...

Johns Hopkins Applied Physics Laboratory (APL) seeks a Reverse Engineer and AI Workflow Developer to design and analyze complex software, firmware, and systems supporting national security and critical missions. You will decompile and analyze binaries, identify vulnerabilities, and build robust AI-driven workflows that automate reverse engineering,...

Johns Hopkins Applied Physics Laboratory (APL) seeks an Advanced Reentry Mission Engineer to design, analyze, and optimize atmospheric reentry systems supporting national security and space missions. You will develop trajectory and guidance solutions, model aero thermal environments, and integrate sensors and avionics into complex systems. Working ...