Principal Optical Engineer Avantus FederalPrincipal Optical EngineerLorton, VA$164,500–$213,500 / yearYou'll support programs to provide our customers with capabilities like long-range optics for scout surveillance and fires support, body-worn EOIR sensors, fire control, and more- you'll help provide the sensing capability that enables the 'observe' stage of the OODA (observe, orient, decide, act) loop. QinetiQ US is looking for a Principal Optical Engineer experienced in electro-optic/ infrared (EOIR) imaging sensor optical design, laboratory optical characterization, and prototype integration with a willingness to learn new skills to join our team.
NewSenior Software Engineer - Front End/Back End (Library of Congress) Ad HocSenior Software Engineer - Front End/Back End (Library of Congress)Mc Lean, VARemote$120,000–$140,000 / yearPrimary expectations of a Senior Software Engineer - Front End/Back End include: Design, develop, and deploy high-quality features across frontend or backend systems within a cloud-native microservice architecture, with strong ownership of your area of the codebase. We partner with these agencies to build new capabilities, deliver products, establish data as a strategic asset for informed decision-making, modernize legacy systems, and build the digital service infrastructure necessary to scale their mission impact.
NewSenior Software Engineer FS - backend focused Ad HocSenior Software Engineer FS - backend focusedMc Lean, VARemote$125,000–$145,000 / yearWe partner with these agencies to build new capabilities, deliver products, establish data as a strategic asset for informed decision-making, modernize legacy systems, and build the digital service infrastructure necessary to scale their mission impact. In support of various state and city equal pay transparency laws, Ad Hoc job descriptions feature the starting range we reasonably expect to pay to candidates who would join our team with little to no need for training on the responsibilities we've outlined above.
Principal Hardware Engineer - TeraWave Network Switch Platform Blue Origin Enterprises LPPrincipal Hardware Engineer - TeraWave Network Switch PlatformReston, VA$183,193–$256,469.85 / yearBlue Origin's Emerging Systems business unit is building TeraWave, a satellite communications constellation powered by the most advanced optical communications architecture ever attempted: thousands of optically interconnected satellites delivering symmetrical data speeds of up to 6 Tbps anywhere on Earth, providing enterprise and hyperscale customers with resilient, scalable connectivity for critical operations where terrestrial infrastructure cannot reach. and/or transports placardable amounts of hazardous materials by ground in any vehicle on a public road while in commerce, may be subject to additional Federal Motor Carrier Safety Regulations including: Driver Qualification Files, Medical Certification (obtained before onboarding), Road Test, Hours of Service, Drug and Alcohol Testing (CDL drivers only), vehicle inspection requirements, CDL requirements (if applicable) and hazardous materials transportation/shipping training.
Principal Structural Engineer 4 M.C. Dean IncPrincipal Structural Engineer 4Richmond, VAHeadquarters in Tysons, Virginia, M.C. Dean delivers resilient, secure, and innovative power and technology solutions through engineering expertise and smart systems integration. With over 7,000 employees, our capabilities span electrical, electronic security, telecommunications, life safety, automation and controls, audiovisual, and IT systems.
Senior Software Engineer - NatSec SnowflakeSenior Software Engineer - NatSecMcLean, VirginiaTo be successful in the area, you will need to have (and continue to build) a broad and in-depth knowledge base on cloud infrastructure, privacy, and governance, compliance controls, data security and data residency in various aspects of Snowflake. We look for low-ego individuals who thrive in dynamic and fast-moving environments and move with an experimental mindset — who rapidly test emerging capabilities to discover simpler, more powerful ways to deliver results.
Senior Software Engineer - Natsec SnowflakeSenior Software Engineer - NatsecMclean, VA$200,000–$287,500 / yearTo be successful in the area, you will need to have (and continue to build) a broad and in-depth knowledge base on cloud infrastructure, privacy, and governance, compliance controls, data security and data residency in various aspects of Snowflake. We look for low-ego individuals who thrive in dynamic and fast-moving environments and move with an experimental mindset - who rapidly test emerging capabilities to discover simpler, more powerful ways to deliver results.
Principal Cybersecurity Engineer - US Federal Workday IncPrincipal Cybersecurity Engineer - US FederalReston, VA$184,800–$277,200 / yearWe know that flexibility can take shape in many ways, so rather than a number of required days in-office each week, we simply spend at least half (50%) of our time each quarter in the office or in the field with our customers, prospects, and partners (depending on role). As a Fortune 500 company and a leading AI platform for managing people, money, and agents, we're shaping the future of work so teams can reach their potential and focus on what matters most.
Senior Software Engineer CoStar GroupSenior Software EngineerRichmond, Virginia$130,000–$170,000 / yearCoStar is investing heavily in artificial intelligence to accelerate software delivery, improve platform observability, automate research and business workflows, enhance product experiences through intelligent agents and skills, and improve data quality across enterprise systems. Included in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives.
Senior Software Engineer - Quality Engineering CoStar GroupSenior Software Engineer - Quality EngineeringRichmond, VirginiaDesigns, documents, and implements testing procedures and techniques aligned with departmental SQA Methodology, evaluating software and business risk, accuracy, completeness, internal integrity, testability, and overall quality across business systems and SDLC processes. Creates and maintains SQA deliverables including test plans, test cases, test data, project test progress and release reports, application turnover documents and test schedules.
Senior Software Engineer- CoStar Suite- Arlington, VA CoStar GroupSenior Software Engineer- CoStar Suite- Arlington, VAArlington, Virginia$124,000–$187,000 / yearIncluded in the S&P 500 Index, CoStar Group is on a mission to digitize the world’s real estate, empowering all people to discover properties, insights and connections that improve their businesses and lives. . 5+ years of production development experience in modern technologies, like React, Vue, TypeScript, NodeJS, C#, Net, OpenSearch, Kafka, SQL, NoSQL.
26-5028: Sr Software Engineer - .Net Navitas Business Consulting26-5028: Sr Software Engineer - .NetHerndon,, VAFull timeMaster’s degree or foreign equivalent degree in Computer Science, Information Technology, Information Systems, Computer Applications, Electrical/Electronics Engineering, Business Administration, Management, Engineering (any), or a related field, plus two (2) years of experience in any position/title providing experience in. With proven solutions, award-winning technologies, and a team of expert problem solvers, Navitas has consistently empowered customers to use technology as a competitive advantage and deliver cutting-edge transformative solutions.
Senior Software Engineer UnissantSenior Software EngineerAshburn, VARemoteFull timeCommunication Skills:Excellent verbal and written communication skills, with the ability to explain architecture, technical risks, accessibility considerations, and solution tradeoffs to technical and nontechnical audiences. Build user interfaces, APIs, middleware, data services, and back-end components for RAG/chatbot, document-processing, predictive-analytics, and enterprise-automation solutions.
Senior Software Engineer GovServicesHubSenior Software EngineerWest Mclean, VirginiaWe are seeking a highly experienced hands-on Full Stack Engineer to design and development of cutting-edge AI Agents, Agentic Workflows, and Gen AI Applications that solve complex business problems. You will serve as a hands-on engineer, working alongside Gen AI scientists, UX designers, product managers, and data engineers to shape and implement enterprise-grade Gen AI solutions.
Senior Software Engineer (Leadership) 2026-0138 Acclaim Technical ServicesSenior Software Engineer (Leadership) 2026-0138Chantilly, VAFull timeAcclaim Technical Services, founded in 2000, is a leading cyber operations, intelligence solutions and operations, network infrastructure, engineering and business enablement and enterprise operations company supporting a wide range of U.S. Federal agencies. You will take direct ownership of the control plane, administrative interfaces, user and role management, and peripheral/device management services, enabling the broader platform to be deployed and operated consistently in the field.
Senior Software Engineer Seekr Technologies IncSenior Software EngineerReston, VAAvailable across cloud, on-premises, and edge environments, SeekrFlow reduces bias, strengthens data integrity, and simplifies model oversight so organizations can rely on trusted AI decisions in high-stakes settings that impact society's most sensitive and vital systems. Trusted by leading enterprises and government agencies, we partner with defense, finance, telecom, and critical infrastructure leaders to enable AI solutions that drive real-world results with unmatched transparency and control.
NewSenior Software Engineer GrvtySenior Software EngineerChantilly, Virginia$200,000–$270,000 / yearPay Range: At GRVTY, we understand that compensation is influenced by many factors—such as geographic location, federal contract labor categories, wage rates, prior experience, skillsets, education, and certifications. The Senior Software Engineer will be responsible for working within Cloud Services for the Sponsor, using Python, Javascript, and other tools to provide software development support.
Senior Software Engineer CyberMedia TechnologiesSenior Software EngineerMcLean, VADeterministic Guardrail Design: Build "Validation Services" that sit between AI outputs and core systems to enforce rigid business rules, Data-Intensive Development: Use Python and PySpark to build robust data pipelines that feed high-context information into AI models while maintaining traditional SQL-based transactional integrity. CTEC develops and delivers innovative customer-centric technologies and solutions that support the Office of Personnel Management's (OPM) Health and Insurance business unit and Office of the Chief Information Officer (OCIO).
Sr. Software Engineer KBRSr. Software EngineerChantilly, VA$156,400–$215,100 / year10+ years of experience in software development, object-oriented design, architecture, coding, and testing, with substantial experience implementing DevOps practices including CI/CD automation, containerization, orchestration, configuration management, security, and cloud technologies. GED plays a critical role in enabling the Intelligence Community Customer to plan and execute intelligence-gathering missions, transforming collected data into useful information for the Intelligence Community (IC) and Department of Defense (DoD) users.
Senior Software Engineer AppianSenior Software EngineerMclean, VA$125,000–$250,000 / yearGrowth Opportunities: Appian provides a diverse array of growth and development opportunities, including our leadership program tailored for new and aspiring managers, a comprehensive library of specialized department training through Appian University, skills based training, and tuition reimbursement for those aiming to advance their education. As a performance-focused Mid to Senior level Software Engineer at Appian you will help build tools to solve complex performance problems and tackle our most challenging technical problems alongside other brilliant engineers.