.NET Full Stack Developer

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-ass…

Staff Full Stack EngineerAbout Pay-iAt Pay-i, we are tackling one of the most significant challenges in enterprise AI: demonstrating the ROI of Generative AI investments. With global spending on Generative AI projected to reach $600 billion by 2028, a staggering 72% of CIOs cite measurement and forecasting as their primary obstacle, and only 13% of business leaders report substantial enterprise-level benefits from Generative AI. Our unique platform converts every model call, prompt, and agent interaction into CFO-grade metrics, enabling enterprises to gain financial clarity, identify successful use cases, optimize costs, and demonstrate impact.Founded by former Microsoft executives with over 20 years of experience each, Pay-i is a seed-stage startup supported by five venture capital firms and C-suite angels from industry giants like Microsoft, Twilio, and Zoom. If you are eager to contribute to products that fundamentally transform how enterprises scale their AI initiatives, we invite you to help us launch the definitive system of record for Generative AI ROI.The OpportunityAs a Staff Full Stack Engineer at Pay-i, you will be a vital member of our team, collaborating closely with fellow Full Stack Engineers to craft our customer’s front-end experience. This role offers an exceptional opportunity to innovate and experiment alongside a seasoned team of GenAI leaders who value customer feedback.What You'll DoAre you passionate about developing groundbreaking products that address critical financial challenges in leveraging Generative AI? As our Staff Full Stack Engineer, your contributions will be instrumental in our mission. You will shape the user experience across our dashboards, websites, and products, while establishing a strong foundation for our future growth.Core Responsibilities:Collaborate with Pay-i's front-end and back-end engineers to swiftly deliver both prototype and production-quality productsDesign high-quality, enjoyable user experiences by creating interfaces that are intuitive, performant, and reliableMaintain high graphic standards and ensure brand consistency across all customer interactionsApply responsive design principles to guarantee seamless display on various devices and screen sizesRefactor existing code to enhance performance, structure, and readabilityUtilize state management libraries and patterns (e.g., Redux, Context API) to efficiently manage application state

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.

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.

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).

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 Aristotle as a Senior Full-Stack Developer, where you will leverage your expertise in designing and architecting sophisticated, data-centric systems. In this pivotal role, you will create and implement innovative applications, APIs, and services that manage large quantities of both structured and unstructured data. Your proficiency with AI and ML techniques—such as machine learning pipelines, natural language processing, and large-scale text analysis—will play a crucial role in advancing our technology for the future.Key ResponsibilitiesDesign, develop, and rigorously test applications utilizing Microsoft .NET, C#, ASP.NET, MS SQL Server, and modern front-end frameworks like Angular or comparable technologies.Build and sustain RESTful APIs and services that can effectively manage scalable, high-throughput data flows.Integrate cutting-edge technologies, focusing on AI/ML frameworks, NLP toolkits, and cloud-based data processing.Devise solutions for ingesting, transforming, and analyzing extensive datasets and texts.Contribute to architectural strategies, including microservices and distributed systems design.Create and configure CI/CD pipelines to ensure seamless integration and delivery.Provide ongoing production support for applications and services, including maintaining legacy systems.Document systems and processes to ensure continuity and scalability.Collaborate with stakeholders to analyze requirements and contribute to both functional and technical specifications.Mentor team members, conduct code reviews, and advocate for best practices in software development.

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.

About HelionHelion is a pioneering fusion energy company located in Everett, WA, dedicated to the ambitious mission of constructing the world's first fusion power plant. Our goal is to facilitate a future powered by limitless clean energy, ensuring reliable and affordable electricity for all.Founded in 2013, Helion has successfully secured over $1 billion in funding from esteemed investors including Sam Altman, Mithril, Capricorn Investment Group, as well as new partners like SoftBank and Lightspeed, propelling our innovative endeavors forward. Our latest prototype, Trenta, has achieved remarkable milestones, completing 10,000 high-power pulses and reaching plasma temperatures of 100 million degrees Celsius (9 keV). We are currently advancing with Polaris, our next prototype, on the journey toward realizing the world's first fusion power plant.This is a critical moment to join Helion, where you will confront real-world challenges alongside a team that values urgency, thoroughness, accountability, and a commitment to transparency—principles vital to achieving unprecedented energy solutions. Together, we will reshape the future of energy, because the world cannot afford to wait.Your ResponsibilitiesAs a Senior Full Stack Software Engineer, you will be responsible for designing, developing, and operating secure, dependable, scalable, and user-friendly full-stack applications that enhance processes across mechanical and electrical engineering, supply chain, inventory management, manufacturing, and finance. You will integrate these applications with our internal data platform and external systems, playing a high-impact role within a cross-functional team dedicated to business-critical applications that amplify the effectiveness of various departments throughout the organization.Your Key Contributions Will Include:Designing and developing front-end interfaces, APIs, workflows, database architectures, and caching strategies.Operating as a part-time product manager and UX designer, gaining insights into user interactions and workflow processes.Monitoring and continuously enhancing system performance and reliability using leading observability tools.Collaborating with software engineers, data analysts, scientists, engineering teams, business leaders, and vendors to comprehend feature and data requirements and deliver effective solutions.Staying updated on emerging technologies while recommending proven solutions that align with strategic objectives.Participating in on-call rotations to uphold our service-level agreements and prevent interruptions in round-the-clock production schedules.

Senior Full Stack Software EngineerJoin AZX, a pioneering company dedicated to driving positive transformation in vital sectors through advanced AI solutions.We are rapidly expanding our reach, collaborating with industry leaders in real estate, energy, logistics, and utilities.As a public benefit corporation established in 2024, we have achieved profitability from day one by leveraging our consulting expertise.Our focus areas include clean energy innovation, decarbonization efforts, climate risk assessment, energy systems, and global economic strategies. We are committed to creating a workplace that attracts those who share our passion for AI and impactful change.Role OverviewWe are looking for a Senior Full Stack Software Engineer who will play a crucial role in delivering exceptional solutions to our clients and enhancing our internal platform. As one of the initial full-time engineers, your contributions will significantly shape our development process.You will engage in diverse projects, ranging from enterprise-level applications to rapid innovation cycles, while we simultaneously invest in our platform to enhance client value.Be part of a team led by seasoned professionals from the climate and AI sectors, including experts from Microsoft, AI2, ARM, and notable startups, as well as PhD-level researchers and former executives.Key ResponsibilitiesTransform vague client challenges into functional code.Lead projects from initial discovery through to deployment.Work collaboratively with both client and internal teams.Write clean, scalable, and maintainable code that meets quality standards.Incorporate AI technologies into our solutions, including analytical models and digital twins.Foster interdisciplinary collaboration.Promote engineering best practices and a positive development culture.

Aerostrat is seeking a Senior Full-Stack Software Engineer in Seattle. This position involves leading projects that influence the direction of our technology. The role calls for experience in both front-end and back-end development, with a focus on building applications that serve users effectively. Role overview As a Senior Full-Stack Software Engineer, you will work with teams across disciplines to design and implement scalable solutions. The position emphasizes collaboration and a commitment to refining our development processes. What you will do Lead and contribute to key software projects from concept to delivery Develop and maintain both front-end and back-end components Work closely with cross-functional teams to ensure applications meet user needs Help drive improvements in our engineering practices Requirements Strong background in full-stack development Experience building scalable web applications Ability to collaborate effectively with diverse teams

Axon is seeking a Senior Full Stack Engineer to join the team in Seattle, WA. This position involves building and maintaining applications that advance law enforcement and public safety. The work spans both front-end and back-end development, with an emphasis on practical solutions and thoughtful design. Key responsibilities Develop and maintain scalable applications across the technology stack Collaborate with engineers, designers, and cross-functional teams to deliver reliable features Contribute to the design, implementation, and ongoing support of complex systems Help advance Axon's mission to protect life and reduce harm using technology Location This role is based in Seattle, Washington.