Senior Full-Stack Developer at Aristotle | Washington, DC

Security Clearance Requirement Active DOD/DSS SECRET security clearance or higher is required for this role. Interim clearance is acceptable. Location Requirement This position is onsite in downtown Washington, DC. Candidates must live in DC, Maryland, or Virginia. Remote work is not available. Role Overview Akumen Inc. seeks a Senior Full Stack Java Developer to join the software development team. This role covers all phases of the software development lifecycle, with emphasis on architecture, design, quality, and implementation. A major focus is upgrading, managing, and maintaining cloud-based applications. Success in this position requires strong experience with Java, Angular, C#, and related technologies. The ideal candidate is analytical, self-motivated, and communicates well while handling both front-end and back-end projects. Key Responsibilities Design, configure, and implement application environments. Develop release management procedures and provide production support. Write and refine software code, conduct unit testing, and perform peer reviews to maintain coding standards and quality. Work with team members on software design, deliver accurate work estimates, and implement new features, including user interfaces and data transformation components. Lead upgrades for complex Angular (v9), C#, and Java (v11) applications to current stable releases, focusing on compatibility, performance, and security. Coordinate with development, infrastructure, and operations teams. Ensure all development activities comply with security policies and practices. Independently address security vulnerabilities found in code scans. Collaborate with Business Analysts, Product Managers, and stakeholders to understand and implement business requirements. Communicate updates to program, project, and team leads about risks or needed adjustments to project plans. Keep current with emerging technologies and best practices. Debug and develop across Java, Spring Boot, Angular, and .NET technologies.

Role Overview Akumen Inc. seeks a Senior Full Stack Java Developer to join its team in downtown Washington, DC. This is an onsite position for candidates living in DC, Maryland, or Virginia. Active DOD/DSS SECRET security clearance (or higher) is required; interim clearance is acceptable. This senior developer will work across the full software lifecycle, with a strong focus on backend Java (Spring Boot) and modern frontend frameworks, especially Angular. The role involves building, maintaining, and modernizing scalable cloud-based applications, always with an eye on performance, security, and code quality. What You Will Do Design, develop, and maintain applications using Java (Spring Boot) and Angular. Build and support scalable, cloud-based environments and production systems. Write maintainable code, perform unit testing, and participate in peer reviews. Work with teammates to design system architecture, APIs, and data models. Modernize and develop RESTful APIs, including migrating legacy SOAP/XML services to JSON-based services. Lead or support modernization projects, such as upgrading Java and Angular frameworks. Troubleshoot and resolve issues across the stack: frontend, backend, and integrations. Follow security best practices and address vulnerabilities found in code scans. Collaborate with Business Analysts, Product Managers, and stakeholders to turn business needs into technical solutions. Estimate work accurately and communicate risks or blockers as they arise. Keep current with new technologies, tools, and industry best practices. Requirements Active DOD/DSS SECRET security clearance or higher (interim acceptable). Residence in DC, Maryland, or Virginia. Ability to work onsite in downtown Washington, DC (not a remote position).

Join our dynamic team at usm2 as a Full Stack Java Developer, where you will play a pivotal role in designing and developing innovative software solutions. We are looking for a talented individual with a strong background in Java development, who is passionate about leveraging technology to solve complex challenges. In this role, you will collaborate closely with cross-functional teams to deliver exceptional products that meet user needs.

Join us as a Senior Full Stack Developer I to play a pivotal role in a high-profile, AI-driven financial compliance program for the Department of War. This essential initiative is focused on modernizing compliance and audit workflows for over 180 systems. You will be responsible for architecting and securing the deployment infrastructure that supports AI-assisted compliance validation, semantic search, and enterprise governance within restricted Department of War environments.This position offers a hybrid work model, with a preference for candidates based in the D.C. metro area who can participate in in-person meetings as necessary.At MetroStar, we believe that exceptional technology services are built from the ground up by amazing individuals. For over two decades, we have cultivated a legacy of assembling the brightest teams. Our commitment to our people is unwavering, as we are driven by a mission that emphasizes a passion for our people and a dedication to our customers.If you see yourself contributing to our mission and helping us achieve our goals, we encourage you to explore the details of this opportunity below!

About BLENThe BLEN team is dedicated to harnessing the power of technology to address real-world challenges. With over 20 years of experience, we have been at the forefront of helping government entities and businesses evolve their digital landscape. We infuse innovative thinking into each project, whether it's revitalizing outdated systems, developing cloud-native applications, or exploring emerging technologies. Our emphasis on building lasting partnerships enables us to tackle complex issues by prioritizing human-centered design in all our solutions.About the RoleAs a Senior Software Developer at BLEN, you will be instrumental in crafting robust and efficient digital solutions. You will leverage your extensive expertise in both front-end and back-end technologies, along with your leadership capabilities, to drive projects from initial concept through to successful implementation. Our engineering team is responsible for making critical technical decisions, ensuring effective communication with all stakeholders, and utilizing state-of-the-art technologies to deliver high-quality solutions. You will play a key role in ensuring that our products not only meet client specifications but also align with overarching business objectives while maintaining exceptional standards of performance and scalability.

Metrostar Systems is looking for a Senior Full Stack .NET Developer in Washington, DC. This position centers on designing and building software solutions that support client projects and business goals. Role overview As a Senior Full Stack .NET Developer, you will collaborate with colleagues from different disciplines to deliver applications that align with client requirements. The work involves both front-end and back-end development, using .NET technologies as a foundation. What you will do Design, develop, and implement software using .NET frameworks Work with cross-functional teams throughout the project lifecycle Apply modern development practices to create scalable solutions Contribute to cloud-based application development as needed What we value Metrostar emphasizes creativity and technical skill. The team encourages new ideas and high standards in software development. Experience with .NET, cloud services, and up-to-date engineering methods is important for success in this role.

Key Responsibilities:Engage with business partners to offer strategic insights on technology choices, including system design and modifications.Collaborate with development and project teams to devise technical resolutions for intricate challenges.Establish and uphold standards for design, development, testing, and documentation, ensuring high-quality, dependable systems that align with business objectives.Define the scope, objectives, and technical direction for new or modified web applications, leading the analysis, design, development, and implementation processes.Provide mentorship and technical guidance to junior developers.Ensure that application design aligns with the overarching vision and future state of existing systems.Experience Requirements:Minimum of 7 years of hands-on experience with the Microsoft .NET framework and C#.Over 1 year of experience with Web API and Entity Framework preferred.Experience with AWS and building disconnected applications using MSMQ is a plus.Proficiency in Windows PowerShell scripting preferred.Solid understanding of application architecture in .NET/Service Oriented models, .NET framework, CLR, and VS.NET for over 7 years.Extensive experience with Microsoft SQL Server, SSIS, and complex SQL stored procedures (7+ years).In-depth knowledge of design patterns and object-oriented design principles (7+ years).Experience with Git and Team Foundation Server preferred.Technical expertise in operating systems, software integration, systems design, and development methodologies, including business requirements analysis.Proven track record of successful project leadership (4 years).Experience in an Agile/Scrum development environment (1+ years).Preferred: Experience with Azure ServiceBus, DocumentDB, nServiceBus, MSMQ.

About BLENAt BLEN, we are driven by a passion for leveraging technology to address real-world challenges. For over two decades, we have partnered with government entities and businesses to enhance their digital transformation journeys. Our innovative approach encompasses everything from updating legacy systems to crafting cutting-edge cloud-native applications, as well as exploring emerging technologies. We prioritize building lasting partnerships and putting human experience at the forefront of our projects. Our team excels in transforming complex problems into practical, accessible, and high-performance solutions.Position OverviewAs a Senior Full Stack Software Developer II at BLEN, you will play a pivotal role in the design, architecture, and development of scalable and robust digital solutions. This position requires a blend of extensive technical skills in both front-end and back-end technologies, along with the capability to collaborate closely with technical leads and, at times, assume tech lead responsibilities. You will be expected to adopt a strategic mindset, mentor fellow team members, and deliver impactful solutions while taking ownership of your work. A strong background in cloud services, system architecture, AI tooling, and a strong drive for innovation through prototyping and transforming concepts into production-ready features is essential for success in this role.

Full Stack Developer - Join our dynamic team at Alitheon as we innovate scalable software solutions for both cloud and on-premise deployment of our cutting-edge authentication services. You will play a critical role in a cross-functional team that oversees the entire software development life cycle, from ideation to deployment, ensuring our solutions meet the highest standards.

Senior Full Stack Developer / ArchitectLocation – Seattle, WADuration – 12 monthsJob Description:We are seeking a talented Senior Full Stack Developer/Architect to join our dynamic team. The ideal candidate will possess strong proficiency in C# and have extensive experience in developing applications from the ground up. Expertise in RESTful web services is essential, along with a deep understanding of Azure for deploying large-scale services that operate in production environments. Key Responsibilities:• Collaborate with business partners to provide insights and recommendations for technology solutions, encompassing package selection and system design modifications. • Partner with development and project teams to troubleshoot and devise technical solutions for complex challenges. • Establish and uphold standards and procedures for design, development, testing, and documentation, ensuring the delivery of quality systems that meet business requirements. • Define scope, objectives, and technical direction for new or updated web applications, leading systems analysis, design, development, and implementation efforts. • Offer technical mentorship and guidance to junior staff. • Ensure that application design aligns with the overarching vision and future state of existing systems.Required Qualifications:• Minimum of 7 years of hands-on experience with the Microsoft .NET framework and C#. • At least 1 year of experience with Web API and Entity Framework is preferred. • Familiarity with AWS is a plus (1+ year). • Experience in building disconnected applications using MSMQ is desirable (1+ year). • Proficiency in Windows PowerShell scripting is preferred (1+ year). • Comprehensive understanding of application architecture and development within .NET/Service Oriented models, .NET framework, CLR, and VS.NET (7+ years). • Solid experience with Microsoft SQL Server, SSIS, and the implementation of complex SQL stored procedures (7+ years). • Extensive knowledge of design patterns and object-oriented design principles (7+ years). • Familiarity with Git and Team Foundation Server (1+ year). • Technical experience across operating systems, tools, software integration, systems design, application design, and development methodologies. • Proven ability to analyze business requirements and identify IT solutions for process improvements (8 years). • Experience in mentoring developers and leading projects to successful completion (4 years). • Familiarity with working in a Scrum or agile development environment (1+ years). • Highly preferred: AZURE ServiceBus, DocumentDB, nServiceBus, MSMQ.

Essential Skills Required:Proficient in C# - proficient in developing applications from the ground up with extensive experience in software development.Expertise in RESTful Web Services - comprehensive understanding and hands-on experience in developing RESTful APIs.Azure Development - experience in deploying large-scale services on Azure and utilizing them in production applications.Key Responsibilities:• Collaborate with business stakeholders to recommend technology solutions, including software package selection and system design modifications.• Consult with project teams to provide innovative technical solutions for complex challenges.• Establish and uphold design, development, testing, and documentation standards to ensure high-quality, reliable systems that meet business needs.• Define the scope, objectives, and technical direction for new or modified web applications, leading systems analysis, design, development, and implementation efforts.• Offer technical guidance and mentorship to development staff.• Ensure that application designs align with the broader vision and future state of existing systems.

Join our dynamic team at Sonsoft Inc. as a .NET Full Stack Developer. We are seeking a talented and driven individual who is passionate about technology and innovation. In this role, you will work on exciting projects, bringing your expertise in both front-end and back-end development to create robust applications.This position requires a solid understanding of the .NET framework, as well as proficiency in modern web technologies. You will collaborate with cross-functional teams to design, develop, and maintain scalable software solutions that meet our clients' needs.

Join our dynamic team at dev2 as a Lead Software Engineer specializing in full stack development. In this role, you will leverage your expertise in Java, Python, Angular, and React to design and implement innovative software solutions. You will lead a team of developers, ensuring high-quality code and fostering an environment of collaboration and continuous improvement.Your contributions will directly impact our projects, making a difference in the technology landscape.

At Stoke, we envision a flourishing space economy as a catalyst for a sustainable, equitable future on Earth. This is why we are developing Nova, our state-of-the-art, fully reusable launch vehicle, engineered for daily flights. Nova addresses the fundamental challenges of space transportation by significantly reducing costs, enhancing availability, and boosting reliability. By drastically lowering launch expenses and increasing flight frequency, we are paving the way for a truly scalable space industry.Our team is driven by a shared mission, thrives on collaboration, and is empowered to take full ownership of their contributions. If you are eager to work alongside some of the most dedicated and talented individuals in the industry, we would be thrilled to welcome you aboard.Position OverviewReusable launch systems are essential for seamlessly bridging Earth and space. A vital component of creating reusable launch vehicles is speed—this is our mission for Boltline by Stoke Space, our cutting-edge software platform designed to assist advanced hardware manufacturing teams in integrating, tracking, iterating, building, and testing efficiently.As a Senior Full-Stack Software Development Engineer on the Boltline team, you will be responsible for designing, developing, and maintaining scalable end-to-end features—from intuitive front-end interfaces to robust backend systems. You will work closely with designers, product managers, and hardware teams to create tools that drive innovation in advanced hardware development. The ideal candidate will exhibit a strong sense of ownership, technical proficiency, and a thirst for knowledge—effectively balancing rapid execution with thoughtful engineering.

Join our dynamic team at Sonsoft Inc. as a .NET Full Stack Developer! We are looking for a talented and motivated developer who is passionate about building high-quality software solutions. The ideal candidate will have a strong background in both front-end and back-end development, with a focus on .NET technologies.

Join Sonsoft Inc. as a .NET Full Stack Developer and be a key player in delivering cutting-edge software solutions. We are seeking a talented professional who thrives in a dynamic environment. You will be responsible for designing, developing, and maintaining high-quality applications across the full stack.Your main tasks will include collaborating with cross-functional teams to define, design, and ship new features, as well as troubleshooting and resolving issues in existing applications. If you have a passion for technology and a desire to make a significant impact, we want to hear from you!

Join our dynamic team at Sonsoft Inc. as a .NET Full Stack Developer. In this role, you will be responsible for designing, developing, and maintaining web applications using the latest technologies in the .NET framework. You will collaborate with cross-functional teams to deliver high-quality software solutions that meet the needs of our clients.

Join our dynamic team at 360IT Professionals as a Full Stack UI Developer. In this role, you will be responsible for designing and implementing user interfaces across various platforms, ensuring a seamless and engaging user experience. You will collaborate with cross-functional teams to create innovative solutions that meet our clients' needs.

Join our dynamic team at Comtech LLC as a Senior Java Developer. In this role, you will utilize your expertise in Java programming to design, develop, and maintain high-quality software solutions. You will be an integral part of our development team, contributing to innovative projects that drive our business forward.