Backend Engineer at Twenty | Washington DC

About TwentyAt Twenty, we are dedicated to addressing one of the foremost challenges of our era: safeguarding democracies in the digital landscape. Our innovative technologies operate at the nexus of cyber and electromagnetic domains, where operational speed surpasses human perception and complexity defies traditional limits. Our team is not just about probl…

Join Our Mission at TwentyAt Twenty, we are committed to tackling one of the most pressing challenges of our era: safeguarding democracies in the digital landscape. We create innovative technologies that merge the realms of cyber and electromagnetic domains, where the pace of operations surpasses human perception and complexity goes beyond traditional limits. Our team not only addresses problems but also delivers transformative outcomes that significantly enhance national security. We embody a spirit of pragmatic optimism, believing that while our mission to protect America and its allies is formidable, it is indeed achievable.Position OverviewAs an Applied AI Engineer, you will develop and implement language-model-driven systems that bolster Twenty's vital cyber capabilities for U.S. national security. You will manage the complete workflow—from curating specialized datasets and post-training models to deploying dependable inference and retrieval systems in live environments. Collaborating closely with product and engineering teams, you will convert real operational demands into high-performance AI features, operating seamlessly across cloud and on-premises environments where speed, accuracy, and security are paramount.Your ProfileYou are driven by tangible outcomes and aspire for your work to directly influence national security initiatives.You prioritize rigor: clean data, quantifiable evaluations, and reproducible experiments take precedence over mere demonstrations.You strike a balance between research curiosity and product intuition—you ship, analyze, iterate, and refine.You are adept at navigating both cloud and on-premises constraints and can adjust to various environments.You convey ideas clearly to both technical and non-ML stakeholders, and your documentation is user-friendly.You understand systems thinking: models, retrieval, infrastructure, and feedback loops must function cohesively.You excel in dynamic teams with high standards, open feedback, and a strong sense of ownership.Key ResponsibilitiesDevelop, clean, and sustain high-quality training and evaluation datasets tailored for specialized AI applications.Fine-tune language models (ranging from small specialized to medium foundation models) according to mission requirements.Apply post-training and alignment techniques to enhance task performance and reliability.Construct retrieval-augmented generation (RAG) systems that integrate model outputs with external knowledge.Enhance and optimize model serving infrastructure for production deployment.

About TwentyAt Twenty, we are tackling one of the most pressing challenges of our era: safeguarding democracies in the digital landscape. Our innovative technologies bridge the cyber and electromagnetic domains, where operational speed surpasses human perception and complexity exceeds traditional limits. Our dedicated team goes beyond conventional problem-solving; we produce transformative results that significantly enhance national security. As pragmatic optimists, we are aware that while our mission to protect America and its allies is formidable, achieving success is within our reach.Role OverviewIn this pivotal role, you will spearhead and define the direction of Twenty’s offensive cyber research division—crafting strategies, building a top-tier team, and ensuring that our capabilities align with genuine operational demands. You will supervise both forward-deployed analysts collaborating with government mission teams and research engineers developing next-gen offensive capabilities from our Arlington headquarters. Your collaboration with product, engineering, and business leaders will be crucial, and you will represent Twenty in engagements with senior government stakeholders. This role is uniquely positioned at the convergence of innovative research, disciplined execution, and impactful mission outcomes.

About UsHelsing is at the forefront of defense AI technology, dedicated to safeguarding our democratic values. Our goal is to establish technological supremacy that empowers open societies to make independent choices and uphold their ethical standards.As a defender of democracy, we recognize our unique obligation to thoughtfully develop and implement transformative technologies like AI. We take this duty with utmost seriousness.We are a passionate and dedicated team of engineers, AI experts, and program managers, seeking mission-driven individuals to join our European teams and leverage their skills to tackle some of the most challenging and significant issues. We foster a transparent and open culture that encourages constructive discussions about the application of technology in defense, its advantages, and its ethical considerations.The RoleAs an IT Engineer, you will oversee Helsing's IT and infrastructure in the United States. Your responsibilities will span across teams and locations to create a secure and reliable infrastructure that supports collaborative efforts focused on the transmission, development, and delivery of defense technologies in compliance with relevant regulations, standards, and industry best practices. You will play a critical role in enabling Helsing to provide advanced systems that address the challenges of future battlefields.Daily ResponsibilitiesConfigure and manage endpoints, including workstations, laptops, and servers.Provide support for an office consisting of approximately 10-25 employees.Establish and maintain on-premises computer environments primarily based on Linux.Manage and configure our network and VPN infrastructure.Collaborate with Helsing's broader IT team to optimize the operational efficiency of Helsing US's corporate, development, and customer environments, largely utilizing Microsoft 365, Azure, and other SaaS solutions.

Join ableserve as a Chief Engineer, where you will lead innovative engineering projects and spearhead the development of cutting-edge solutions. In this pivotal role, you will oversee engineering operations, manage a talented team, and ensure the successful execution of projects from conception to completion.

Join XMSTART, a leading company in the field of systems engineering, as we seek talented and strategic full-time Systems Engineers to join our dynamic team in Chantilly, VA or Washington, DC. This role requires 100% on-site presence to foster collaboration and innovation.Security Clearance Requirements:Active TS/SCI with Polygraph is mandatoryEducation:Bachelor's Degree is preferredQualifications:Proven technical experience with Intelligence Community (IC) analytic toolsStrong understanding of the system development lifecycle (SDLC)Hands-on experience with systems integration and configurationFamiliarity with programming languages such as Python and Java, along with scripting capabilitiesExpertise in operating systems including Windows and Linux, as well as knowledge of network protocolsResponsibilities:System Design and DevelopmentAssess user requirements and system specificationsCreate system architectures and detailed specificationsIntegrate hardware and software components to deliver fully functional systemsSystem ImplementationInstall, configure, and rigorously test system componentsDevelop and maintain critical documentation, including technical specifications and user manualsEnsure system compatibility and interoperabilitySystem Maintenance and OptimizationMonitor system performance and effectively troubleshoot issuesImplement necessary updates, patches, and upgradesOptimize system processes to enhance efficiency and reliabilityCollaboration and CommunicationCollaborate with cross-functional teams, including developers, network engineers, and project managersCommunicate complex technical concepts to non-technical stakeholdersProvide training and support to end-usersCompliance and SecurityEnsure adherence to industry standards and organizational policiesImplement robust security measures to safeguard system integrity and protect dataXMSTART Inc. is an Equal Opportunity Employer

Join the dynamic team at XMSTART, where we are actively seeking skilled and strategic full-time Systems Engineers based in either Chantilly, VA or Washington, DC. These roles require a commitment to working 100% onsite.Key Responsibilities:Analyze user requirements and system specifications to design effective solutions.Develop system architectures and detailed specifications tailored to client needs.Seamlessly integrate hardware and software components to produce operational systems.System Implementation:Install, configure, and rigorously test system components for optimal performance.Create and maintain comprehensive documentation, including technical specifications and user manuals.Ensure systems are compatible and interoperable with existing infrastructure.System Maintenance and Optimization:Continuously monitor system performance, troubleshoot issues, and implement necessary updates.Enhance system processes to boost efficiency and reliability.Collaboration and Communication:Engage with cross-functional teams including developers, network engineers, and project managers.Translate complex technical concepts into understandable terms for non-technical stakeholders.Provide training and support to end-users to ensure effective system utilization.Compliance and Security:Ensure all systems adhere to industry standards and internal policies.Implement robust security measures to safeguard system integrity and data privacy.XMSTART Inc. is committed to fostering a diverse and inclusive workplace.

Role Overview Viderity is seeking a DevOps Engineer based in Washington, DC. This role focuses on automating build, test, and deployment systems to support a range of codebases, tools, and platforms. What You Will Do Design and implement automated solutions for building, testing, and deploying applications across multiple environments and technologies. Work closely with both legacy and new project teams to improve development pipelines and streamline the software development lifecycle. Maintain and troubleshoot continuous integration systems to keep build and deployment processes running smoothly. Develop, maintain, and troubleshoot automated testing frameworks and tools for a variety of projects and methodologies, including Agile and Waterfall. Set standards for static code analysis and track related metrics across project teams. Architect cloud-based solutions, including configuring and launching virtual machines for application deployment. Work with both Linux and Windows systems, emphasizing automation and scalability. Communicate proactively with project teams to ensure coordination and efficient workflows. Identify and implement improvements to speed and efficiency as technologies evolve. Research new DevOps tools and trends, evaluating open-source options and industry developments for possible adoption.

Join Our Innovative AI Lab as a DevOps Engineer!At Cognition, we are at the forefront of applied artificial intelligence, creating cutting-edge software agents that transform the engineering landscape. Our flagship products, Devin—the world's first AI software engineer—and Windsurf, an AI-native integrated development environment (IDE), embody our vision for collaborative AI that allows engineers to tackle more challenging and rewarding problems.Our team is a powerhouse of talent, featuring elite competitive programmers, former entrepreneurs, and leaders from top-tier AI companies such as Scale AI, Palantir, Waymo, Tesla, and Google DeepMind.While we have successfully developed Devin and Windsurf, we recognize that our most significant challenges are still ahead. If you are passionate about solving major global issues and developing AI that can reason through real-world tasks, we invite you to become a part of our journey.About the RoleThis is an exceptional opportunity to become a foundational engineer within our newly established federal division. As one of the pioneering engineers in this vital area, you will have a significant impact on shaping our technical direction and achieving initial project milestones. You will also be crucial in guiding the strategic growth and scalability of our federal engineering team, establishing essential engineering practices, defining our technical stack for federal clients, and influencing the culture of a mission-driven team.As a Federal DevOps Engineer, you will be a full-stack deployment expert, responsible for managing the technical lifecycle of our key federal enterprise deployments.You will lead a focused set of strategic deployments, collaborating directly with customer engineering teams to outline complex deployment requirements, ensure adherence to security protocols, and implement necessary platform modifications.A pivotal aspect of this role is enhancing our products from a deployability and operability perspective. You will make direct modifications to the core codebase, ensuring our products can be deployed efficiently and reliably across various environments. You will identify deployment patterns in the field and translate those insights into actionable requirements that guide future core engineering developments. When customers encounter challenges that our product does not address, you will be the problem-solver who identifies the necessary solutions and brings them to fruition.You will steer the technical strategy of our deployments, making critical decisions that influence long-term adoption, architectural design, and the evolution of the Cognition platform in real-world applications.

Sigma Defense is hiring a Systems Engineer in Washington, DC to support Navy Above Water Sensor and Combat System projects. This position covers the full system lifecycle, from shaping early requirements through delivery and evaluation. The role involves close collaboration with government stakeholders, industry partners, and cross-functional teams. What you will do Perform engineering analyses and help develop requirements Contribute to system design and participate in technical reviews Apply Model-Based Systems Engineering and digital engineering methods Assist with risk management, trade studies, and technology assessments Evaluate system performance and help plan testing and evaluation Support modeling and simulation activities Assist with cybersecurity engineering and RMF documentation Provide technical input for acquisition milestones Work closely with stakeholders and project teams Location This position is based in Washington, District of Columbia, United States. Additional details Employment is contingent upon the successful award of a contract. Offers will be extended once the contract is finalized. Equal Opportunity Sigma Defense is an Equal Opportunity Employer/Veterans/Disabled. All qualified applicants will be considered for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status. Sigma Defense does not discriminate on the basis of disability.

About UsAt Helsing, we are pioneering the future of defense through artificial intelligence. Our mission is clear: to safeguard our democracies and ensure that open societies retain the authority to make sovereign decisions while upholding their ethical standards.We recognize the profound responsibility that comes with developing and deploying powerful technologies such as AI. Our commitment to thoughtful innovation is unwavering.As a dynamic and dedicated team of engineers, AI experts, and program managers, we invite mission-driven individuals to join us in addressing some of the most intricate and impactful challenges in the defense sector. Our culture fosters openness and transparency, encouraging constructive debates about technology use in defense, its advantages, and ethical considerations.Your RoleJoin us as we establish our first engineering team in the U.S. based in Washington, DC. As a key early member, you will play a crucial role in creating a secure infrastructure for our applications and cloud architecture. Your responsibilities will bridge security and engineering, encompassing cloud architecture, application SBOM, vulnerability scanning, and continuous monitoring of our cloud infrastructure (AWS/Azure/GCP).This position serves as a vital link between engineering and security operations, focusing on risk identification, designing and implementing security controls (firewalls, IAM, encryption), and performing in-depth analyses of cloud-native security logs to detect and address threats.Daily ResponsibilitiesCloud Infrastructure Security Design: Architect and implement secure cloud infrastructure while ensuring compliance with leading security frameworks (NIST, CIS Benchmarks, ISO 27001).Security Operations Collaboration: Collaborate closely with engineering teams to integrate security best practices into all phases of the software development lifecycle.Vulnerability Management: Conduct regular assessments and penetration tests to identify vulnerabilities and implement remediation strategies.Threat Intelligence: Stay updated on emerging threats and security trends, providing recommendations for proactive measures.

Job Title: Senior Solutions EngineerLocation: Washington, DCJob Description:Deliver expert technical support to the Data Center and Infrastructure Department in architecting robust solutions for infrastructure, databases, storage, systems, and backup layers.Develop and implement best practices for migration and upgrade projects, ensuring seamless transitions.Design and execute testing and quality assurance strategies while spearheading remediation efforts.Collaborate with project leads on infrastructure enhancement initiatives, including Virtual Desktop migrations, ISO process improvements, and disaster recovery/business continuity strategies.Address client inquiries and conduct analyses of various scenarios to provide data-driven recommendations.Work alongside IT infrastructure specialists to maximize infrastructure capabilities and enhance design and application performance.

Join Speechify as a Software Engineer on our Platform team, where you'll play a crucial role in developing and enhancing our innovative solutions. If you are passionate about technology and eager to make a difference, this is the perfect opportunity for you!In this role, you will collaborate with cross-functional teams to design, implement, and maintain scalable software solutions that will improve user experience and drive our mission forward. Your expertise will be key in ensuring the reliability and performance of our platform.

About Authorium Authorium builds software that helps agencies manage complex, document-heavy workflows. The platform brings together key administrative functions like budgeting, procurement, and contracting to streamline government operations. By combining data from documents, emails, and spreadsheets, Authorium improves visibility and provides actionable insights across organizations. The team partners with public-sector leaders to modernize compliance, policy, and scaling, focusing on collaboration and data-driven improvements. Role Overview: Associate Solutions Engineer The Associate Solutions Engineer (ASE) plays a hands-on role in delivering projects for Authorium’s clients. This position involves leading the execution of delivery tasks for important customer initiatives. The ASE participates in discovery sessions, translates design requirements, configures solutions for clients, and maintains detailed documentation of system decisions. Accuracy, clear communication, and meeting project deadlines are essential in this role. What You Will Do Lead and execute assigned project tasks for customer solutions Join discovery sessions to understand client needs Translate and document design requirements Configure and prepare solutions for client delivery Maintain thorough records of system decisions and changes Communicate clearly with internal teams and clients Ensure tasks are completed accurately and on schedule How the Team Works This role combines consulting with both independent and team-based work. As part of the Solutions team, the ASE collaborates with other business units to refine product features, improve engagement processes, and raise the quality of project delivery. Growth in this position means moving toward subject matter expertise while demonstrating Authorium’s C.A.R.E. values: Collaborate, Accountable, Resilient, Establish Excellence. Location Washington, DC

Paragon Cyber Solutions is excited to offer a fantastic opportunity for driven individuals ready to start a promising and dynamic career as a Network Engineer. Become a vital part of a team filled with bright, talented, and dedicated engineers who take pride in solving complex challenges while developing and delivering innovative solutions tailored to our clients' needs. In this position, you will design, develop, modify, assess, and implement state-of-the-art hardware systems while leading the technical aspects of a multi-disciplinary project team.Security ClearanceActive TS/SCI clearance required, with the ability to obtain and maintain a CI polygraphKey Responsibilities:Lead and mentor IT personnel, fostering development and training.Serve as a subject matter expert by configuring and supporting the IT network environment, including servers, clients, routers, virtual private networks, switches, and firewalls.Systematically troubleshoot technical issues and complex application, system, and network problems, addressing availability, utilization, throughput, and latency.Plan and execute the selection, installation, configuration, and testing of equipment.Develop and define IT policies and procedures.Provide management with feedback and reports on the status and availability of the IT network to ensure optimal function and identify trends.Maintain network performance through monitoring, analysis, and performance tuning.Analyze IT systems and prepare documentation related to performance, stability, interoperability, and lifecycle issues.Utilize various methods and techniques to assist in developing, implementing, and documenting impact assessments and architecture change recommendations.Enhance IT security by developing access controls, monitoring, and evaluation; maintaining documentation in accordance with DoD standards.Participate in designing and developing integrated solutions to meet customer requirements.Perform additional duties as assigned.Qualifications:Bachelor’s degree in Computer Science, Information Technology, or a related field.Master’s degree in Computer Science, Information Technology, or related field preferred.At least 4 years of relevant experience.Comprehensive knowledge of Internet Protocols, communication protocols, and data/network security.Strong understanding of federal government security standards, including FISMA and NIST guidelines.Additional Qualifications:Possession of current DoD 8570 IAT II certification and relevant certifications such as CCNA, CCNP, CCIE, or equivalent.

Are you passionate about helping clients achieve their financial goals? Join Brighton Jones as an Advisor in Washington, DC. In this role, you will leverage your expertise to provide personalized financial advice, ensuring that our clients receive the highest level of service and guidance in their wealth management journey.

About Us: Nitra is dedicated to revolutionizing the healthcare sector through innovative technology solutions. Our mission is to create a streamlined ecosystem of fintech and software tools that empower healthcare professionals to efficiently manage their practices, allowing them to concentrate on what truly matters.At Nitra, we thrive on urgency, ambition, and a passion for excellence. We believe that the high standards we set are essential to harnessing the immense opportunities before us. We emphasize ownership and intellectual rigor, expecting all team members to be accountable for their contributions. We believe that a successful organization is built on trust and respect, where every voice is valued, and every contribution is essential. Together, we celebrate our successes.Currently, Nitra is on an exciting growth trajectory, aiming to achieve unicorn status this year and beyond. This growth is a testament to our disciplined execution, unwavering focus, and a team that strives for greatness. We are in the process of building a transformative company and seek individuals eager to engage in meaningful work.If you are seeking comfort, this may not be the right place for you. However, if you are driven by impact, ownership, and the opportunity to help shape a groundbreaking fintech enterprise, we welcome you.Nitra was founded by visionary entrepreneurs who have successfully scaled companies to thousands of clients and achieved over $1 billion in public offerings. Our team comprises ambitious professionals from renowned organizations such as American Express, Citi, PayPal, Capsule, Plaid, Bloomberg, and Meta. We are supported by leading venture capital firms and an exceptional advisory group, including co-founders of Square and Xendit, and former executives from Intuit.Nitra embraces a hybrid work model, with team members working from the office four days each week, and Wednesdays designated as remote workdays.

Data EngineerEmployment Type: Full-Time, Mid-levelDepartment: Business Intelligence CGS Federal is on the lookout for a dedicated and innovative Data Engineer to join our expanding Data Analytics and Business Intelligence team. This role focuses on delivering transformative solutions that enable our federal clients to convert data into meaningful insights. We seek a candidate who possesses critical thinking skills and a thirst for knowledge, eager to explore various technologies while tackling some of our clients' most significant challenges. At CGS Federal, we unite talented, creative professionals to address the government's most pressing issues using advanced technology. We are committed to fostering an environment where our employees are supported and encouraged to grow professionally through diverse learning opportunities. Key Responsibilities:- Drive the development of data pipelines to effectively store, manage, and provision data for users.- Actively participate as a collaborative member of an Agile/Scrum team, adhering to best practices.- Write robust code to optimize the performance and reliability of data extraction processes.- Facilitate continuous automation of data ingestion processes.- Promote technical excellence by adhering to lean-agile engineering principles, including API-first design, continuous integration, version control, and automated testing.- Collaborate with program management and engineering teams to implement and document complex requirements.- Foster a culture of customer service excellence, innovation, collaboration, and teamwork. Qualifications:- Must be a US Citizen.- Ability to secure a Public Trust Clearance.- 7+ years of IT experience, specifically in designing and managing large, complex data sets and models.- Proven experience in developing data pipelines from diverse sources, including structured and unstructured data.- Expertise in creating ETL processes and conducting thorough testing and validation.- Proficient in data manipulation using languages such as Python, R, SQL, and SAS.- Strong understanding of best practices in data engineering and analytics.

Join SpaceX as a Security Software Engineer and play a pivotal role in safeguarding our advanced technologies. You will be involved in developing, implementing, and maintaining cutting-edge security software solutions to counteract emerging cyber threats. Collaborate with a team of passionate engineers and contribute to the safety and security of SpaceX’s missions.

A. Morton Thomas and Associates, Inc. (AMT), a leading employee-owned consulting engineering firm, is on the lookout for a dedicated SUE Field Technician to become an integral part of our dynamic team in Washington, DC. This position also offers the flexibility to work from our Rockville, MD office.