Principal Software Engineer

Join our innovative team at STR as a Principal Model-Based Systems Engineer (MBSE) in Arlington, VA (also available in Woburn, MA and Dayton, OH) and play a pivotal role across a diverse array of Department of Defense (DoD) mission areas. We seek a seasoned Systems Engineer with a proven track record in leading teams, architecting complex systems, and naviga…

STR is actively seeking a Senior Lead Model-Based Systems Engineer (MBSE) to join our dynamic team in Arlington, VA. This pivotal role involves engaging with a diverse range of Department of Defense (DoD) mission areas, where you will leverage your expertise in systems architecture and the Systems Engineering Lifecycle. The ideal candidate will possess a profound understanding of Systems Engineering principles, reverse engineering techniques, and the capacity to navigate complex software systems. Your contributions will enhance architectural integrity and ensure traceability from requirements analysis to system and software development, culminating in successful production deployment. This role offers an exceptional opportunity to collaborate with leading experts in national security, tackling some of the most pressing challenges in the field. You will be part of a passionate team composed of professionals with backgrounds in engineering, computer science, mathematics, physics, and data science, committed to continuous growth and innovation in MBSE practices.

Quartermaster AI develops AI and robotics systems focused on ocean safety and sustainable management. The team creates distributed open-ocean platforms that allow vessels to sense, compute, and communicate, supporting maritime domain awareness in critical situations. Role overview The Principal Platform Systems Engineer - Test Automation Lead sets the foundation for reliable development across cloud infrastructure, edge computing, and hardware-in-the-loop (HIL) testing. Reporting to the Head of Platform, this role supports the hardware, machine learning, and robotics teams as they deploy in demanding maritime environments. Success in this position requires a systems generalist who is comfortable with AWS pipelines, lab automation, and embedded edge devices. What you will do Design and manage HIL and software-in-the-loop (SIL) test environments, automating lab workflows and hardware bring-up to ensure thorough regression testing. Develop and maintain deployment pipelines with custom release gating for embedded and edge platforms, including NVIDIA Jetson, to support reliable hardware-dependent software updates. Build internal tools and simulation or replay pipelines to accelerate and stabilize development cycles for robotics and ML teams. Implement observability across lab and edge deployments, and provide technical leadership on architecture, standards, and quality controls across teams. Requirements Minimum 10 years in systems or platform engineering, developer experience (DevEx), or embedded infrastructure, with a record of results in startup-like settings. Strong background in Linux systems engineering, networking, and troubleshooting production environments for containerized and reproducible systems. Direct experience with hardware interfaces such as UART, SPI, I2C, CAN, low-level device communication, and integrating lab instrumentation into automated test frameworks. Familiarity with NVIDIA Jetson, software-defined radio (SDR) or RF validation, or deploying AI/ML workloads at the edge in maritime or similarly challenging environments. Benefits Competitive salary and performance-based bonuses Health insurance and wellness programs 401k plan with company matching Generous paid time off and flexible hours Location: Arlington, VA

Join the ARSIEM Corporation TeamAt ARSIEM Corporation, we are dedicated to building strong and trustworthy relationships with our government clients. Our team provides exceptional support to various agencies across the U.S. government. With a highly skilled workforce of professionals, we aim to deliver optimal support and innovative solutions.As the demand for our services grows, we continue to offer advanced technical solutions that provide the best value to our clients. This role offers a fantastic opportunity to advance your career and make a significant impact on the clients you serve.Position Overview: ARSIEM is seeking a Host Based Systems Analyst III to join our team. This role will involve providing frontline support for digital forensics and incident response (DFIR), as well as actively seeking out malicious cyber activities. This position will specifically support one of our government clients located in Arlington, VA.

Systems Technology Research is seeking a talented and experienced Senior Systems Engineer to join our dynamic team in Arlington, VA. In this role, you will be responsible for designing, implementing, and optimizing complex systems and solutions that meet our clients' needs. You will collaborate with cross-functional teams and leverage your expertise to drive innovation and enhance system performance.

Join Our Team:The Sensors Division at Systems Technology Research (STR) is dedicated to pioneering technology for advanced sensor systems and platforms that bolster national security. Our work encompasses a diverse array of critical areas including airborne, surface, and space-based radar, electronic warfare, underwater acoustics, hyperspectral imaging, and electro-optical/infrared (EO/IR) sensing technologies. We are engaged in full system prototypes, experimental campaigns, and the development of next-gen technology components. Key technical domains include RF analog/digital hardware, acoustic hardware, signal processing algorithms, machine learning, tracking and fusion technologies, autonomous systems, and real-time embedded processor implementation.Your Role:We are seeking a skilled Researcher to become a vital part of our high-performing Systems Autonomy, Analysis, and Modeling (SAAM) Group. In this role, you will collaborate with scientists and engineers to design mission-critical scenarios, enhance complex simulation frameworks, and derive actionable insights from simulation outcomes. This position balances hands-on technical development—such as coding new functionalities and integrating models—with analytical reasoning to interpret results and effectively communicate findings to a variety of stakeholders, including program managers and senior leadership.

At Two Six Technologies, we are at the forefront of innovation, crafting, deploying, and implementing cutting-edge solutions to address some of the most intricate challenges the world faces today. With a commitment to unparalleled collaboration and steadfast trust, we redefine possibilities, empowering our team and enabling our clients to create a safer global environment.Opportunity Overview:We are currently in search of a talented Principal Software Engineer to join our dynamic team. This role involves working on multi-domain platforms that support essential national security functions utilizing the latest modern frameworks. You’ll be instrumental in resolving complex challenges related to large-scale data investigation and analysis, facilitating real-time collaboration, managing tasks and resources, and summarizing and visualizing high-dimensional data to help non-experts tackle sophisticated inquiries. The right candidate will possess a robust technical background, outstanding leadership abilities, and a fervor for delivering top-tier software that adheres to the highest quality standards.The role is hybrid, requiring the selected individual to be present in our Arlington, VA office up to three days a week.Key Responsibilities:Lead the comprehensive technical strategy for distributed systems, encompassing architecture and framework selection, implementation, and optimization, while mentoring engineers and enforcing engineering best practices.Collaborate with technical leadership to enhance developer ergonomics, software quality, and security while upholding engineering policies.Boost operational efficiency by refining processes, implementing scalable solutions, and proficiently managing expectations through effective change management.Present technical and programmatic designs, roadmaps, and achievements to both internal and external stakeholders.Design and construct complex platform architectures, including distributed or decentralized topologies, scalable and efficient data infrastructure, APIs, message queuing and event streaming, secure authentication and authorization, as well as containerization and orchestration.Oversee the development team to deliver capabilities and integrations aligned with business goals.Take an active role in recruiting and mentoring junior engineers, aligning project tasks with their career aspirations.

Join our dynamic team at Systems Technology Research as a Principal Program Manager. In this pivotal role, you will lead and oversee critical projects, ensuring their successful execution from inception to completion. Your expertise will facilitate collaboration across multidisciplinary teams, optimizing processes and driving innovation. You will be instrumental in aligning project goals with organizational objectives, while also mentoring junior staff and fostering a culture of continuous improvement.

About RabotRabot specializes in developing cutting-edge vision AI solutions tailored for warehouse packing operations. Our innovative system utilizes cameras to monitor packing lines, while our advanced software identifies inefficiencies and provides operators with real-time feedback, significantly enhancing productivity. Our clients value the measurable improvements we bring to their operations.As a venture-backed organization with partnerships among leading industry players, our proven product is ready for further development. We are seeking talented engineers to advance our real-time systems to the next level.The RoleIn this role, you will be responsible for developing and optimizing the software that powers our hardware systems. This includes managing the real-time pipeline involving cameras, on-device AI models, video processing, and edge computing, creating a seamless interface between the physical environment and our AI technology.You will collaborate closely with our hardware engineering team to enhance the entire perception and processing stack. Your focus will be on ensuring low latency and high reliability, as these systems operate in dynamic warehouse environments rather than controlled data centers.Candidates should possess a minimum of 3 years of relevant experience. We prioritize your achievements and the performance of your projects over the specific companies where you have worked.This position is based in Arlington, TX and is not available for remote work.

About UltraViolet Cyber UltraViolet Cyber delivers unified security operations for organizations facing complex cyber threats. Founded by experienced security professionals, the company blends advanced technology with hands-on expertise to provide real-time solutions that connect red and blue team operations. Clients include Fortune 500 companies, federal agencies, and commercial organizations. Headquartered in McLean, Virginia, UltraViolet Cyber also operates in the U.S. and India, aiming to make advanced cybersecurity widely available. Role Overview: Principal Security Engineer (Zscaler SME) This Arlington, VA-based position focuses on supporting large federal clients as a Zscaler Subject Matter Expert. The Principal Security Engineer works closely with network and security teams to deliver reliable, efficient, and high-performing Zscaler deployments. What You Will Do Oversee deployment and operational support for the Zscaler product suite, including ZPA, ZIA, ZDX, and ZCC. Update documentation as network designs change to keep records accurate and useful. Collaborate with stakeholders to test systems and validate performance. Ensure application migrations align with security and performance requirements. Location Arlington, VA

Delaware Nation Industries is on the lookout for an accomplished Senior Electrical and Energy Systems Engineer to spearhead the design, optimization, and seamless integration of cutting-edge energy solutions across both utility-scale and distributed energy systems. This pivotal role demands extensive expertise in electrical engineering, energy management, renewable energy technologies, and utility operations. The successful candidate will be instrumental in shaping technical strategy, advancing grid modernization efforts, and delivering dependable, efficient, and sustainable energy solutions.Oversee the design, analysis, and implementation of electrical systems for innovative renewable energy projects, including solar, wind, storage, and microgrids.Develop and enhance Energy Management Systems (EMS) to boost efficiency, reliability, and cost-effectiveness.Collaborate with utility stakeholders to ensure adherence to grid interconnection requirements, standards, and regulations.Conduct comprehensive power system studies, encompassing load flow, short-circuit, protection coordination, and stability analysis.Facilitate grid integration of distributed energy resources (DERs), such as battery storage and demand response systems.Provide technical leadership to cross-functional teams, mentoring junior engineers and steering project execution.Assess emerging technologies and propose solutions that align with decarbonization and grid modernization objectives.Guarantee compliance with industry standards (IEEE, NEC, NERC, FERC, etc.).Lead troubleshooting and root cause analysis for complex electrical and energy system challenges.Contribute to business development initiatives, including proposal development and client engagement.

Join STR as a Lead All-Source Analyst and Modeling Engineer, where your expertise in cyber-physical systems will drive innovative research and development. This role requires a passionate individual who thrives on solving complex challenges and can work collaboratively on-site in Arlington, VA. You will develop advanced tools to analyze extensive datasets, create detailed system models, and contribute to multi-disciplinary teams focused on enhancing national security through innovative cybersecurity solutions. Your ability to document, present, and demonstrate your research will be crucial.

Join Aledade as an Account-Based Marketing Specialist and play a vital role in driving our growth by engaging key stakeholders within strategic accounts. In this role, you will be responsible for creating detailed persona maps, nurturing buying committees, and implementing targeted account-based marketing initiatives designed to foster new business opportunities. Collaborating closely with our Strategic Sales and Marketing teams, you will lead campaigns, ensure precise CRM documentation, and facilitate seamless lead transitions, thereby enhancing pipeline growth and account engagement.We offer flexibility in terms of geographic location, with the ideal candidate having the option to work remotely from anywhere in the US or from our Bethesda, MD office.

About the TeamThe Analytics & C2 (AC2) Division at Systems Technology Research (STR) is dedicated to developing groundbreaking technologies that address complex national security challenges through advanced analytics, sense-making, and autonomy solutions. Our team is composed of enthusiastic and skilled professionals with diverse backgrounds in engineering, computer science, mathematics, physics, and data science. We leverage our collective expertise and innovative thinking to evolve ideas from initial conception to full-scale implementation, thereby enhancing mission success for our clients.The Collaborative Autonomy and Controls (CAC) Group within the AC2 Division focuses on creating multi-agent autonomous systems capable of executing multiple missions across various operational environments. Utilizing our proficiency in machine learning, advanced algorithms, and best practices in software development, we craft technologies that revolutionize reconnaissance, tactical operations, and other mission-critical areas.The Role:As a Chief Engineer, you will collaborate closely with leadership in the CAC group to conceptualize, market, and secure programs that propel the group’s technology advancements. You will lead cohesive teams to design, develop, implement, and showcase cutting-edge systems. Your responsibilities will include developing system architectures and implementation strategies for program technologies, engaging with customers to define problems, ideate solutions, and integrate concepts into broader capability ecosystems. You will work with a diverse array of customers, tackling various challenges across technology domains and engineering disciplines, while conducting software architecture and design reviews as part of our agile development process.This position offers the flexibility of STR’s hybrid work environment, allowing for remote work when physical presence at STR’s facilities is not necessary.

Join Two Six Technologies as a Principal Cybersecurity Researcher, where you'll lead groundbreaking research efforts to enhance cybersecurity measures. Your expertise will drive innovation and protect vital systems from emerging threats.

Overview:We are on the lookout for a dedicated Account-Based Experience (ABX) Specialist for the Public Sector to enhance targeted account-based initiatives across federal, state, local, and educational domains. In this pivotal role, you will collaborate closely with sales, customer success, and marketing teams to foster effective engagement within prioritized public sector accounts.The ideal candidate will exhibit strong organizational skills, meticulous attention to detail, and a collaborative spirit, working alongside sales teams to facilitate account engagement, drive pipeline progression, and implement high-impact programs.

Zetier is on the lookout for a highly skilled Information Systems Security Engineer (ISSE) to join our team in Arlington, VA. This role is pivotal in leveraging your expertise in cloud automation, Infrastructure-as-Code, virtualization, and orchestration. You will be responsible for supporting, building, and securing cloud-based environments through innovative automation strategies, significantly enhancing our ability to rapidly deploy and manage scalable infrastructure solutions.

Are you ready to revolutionize connectivity through space, making it universally accessible, secure, and actionable? Join us at E-Space!At E-Space, we are pioneering the integration of Earth and space to facilitate massive deployments of Internet of Things (IoT) solutions and services. We are actively developing a cutting-edge low Earth orbit (LEO) space system that will transform the design, economics, manufacturing, and service delivery paradigms of traditional satellite and terrestrial IoT systems.Our team is intentional, curious, and wholly dedicated to innovating space-based communications, delivering actionable intelligence that will stimulate global economies, safeguard space and our planet, and elevate our collective quality of life.As a Senior Wireless Communication Systems Engineer, you will take charge of modeling, simulating, and designing the physical layer modem within a LEO satellite constellation communication network. Your expertise will be crucial in guaranteeing reliable and efficient data transmission in sophisticated satellite communication systems. You will utilize your knowledge in system analysis and modem design, including time/frequency unit analysis, FEC design, modulation, and demodulation processes in advanced wireless communication frameworks. This role reports to the Sr. Director of Product and System Integration, Silicon. You will collaborate closely with systems, software, hardware, and testing teams responsible for delivering the communications payload. This position is located in our Arlington, TX office.

Systems Technology Research (STR) is seeking a Principal Software Reverse Engineer who is passionate about researching and analyzing vulnerabilities in cyber-physical systems. This role is part of a multidisciplinary team of skilled researchers and engineers committed to creating innovative technologies that significantly impact national security. You'll have the opportunity to work at the intersection of computer systems and real-world applications, where your unique skills and perspectives will contribute to delivering cutting-edge solutions for our clients.Important: All work must be performed onsite, and an Active Top Secret (TS) Clearance is required.Key Responsibilities:Conduct reverse engineering on complex software or firmware, encompassing a range of targets from standard Windows/Linux binaries to embedded firmware on unconventional computer architectures and operating systems.Develop and utilize automated reverse engineering and binary analysis tools to characterize protocols, interfaces, and functionalities of target systems.Innovate and implement advanced cybersecurity solutions.Lead cross-functional teams to address challenging problems across various technologies, creating groundbreaking cybersecurity strategies.Engage in vulnerability weaponization, exploit development, payload creation, and exploit mitigation on diverse complex targets.Conduct technical marketing to both existing and prospective customers.Contribute to technical proposal development through idea generation, writing, reviewing, and editing.Document, demonstrate, and present research findings.Address real-world challenges that influence national security.