> Markdown version of [/jobs/ext/2185380-senior-fullstack-engineer-net-react-umbraco-cms-agency](https://www.wearedevelopers.com/jobs/ext/2185380-senior-fullstack-engineer-net-react-umbraco-cms-agency). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Fullstack Engineer (.NET/React + Umbraco CMS) - Agency - **Company:** Truelogic Software, LLC - **Location:** New York, NY, United States (Remote available) - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** HTML, JavaScript (Programming Language), .NET Framework, Web Accessibility, Application Programming Interfaces (APIs), Amazon Web Services, Cascading Style Sheets (CSS), Software Quality, Code Review, Continuous Integration, Microsoft SQL Server, Node.Js, Performance Tuning, Responsive Web Design, Software Engineering, Umbraco, Web Applications, Web Application Frameworks, Web Performance Optimization, ReactJS, Git, AngularJS, Material UI, Front End Software Development, Restful APIs - **Published:** August 22, 2026 - **Apply:** https://www.careerboard.com/us/en/find-jobs-in-United-States/-E683CD22DE942A53CF/ ## About the Role * 5+ years of experience as a developer * Strong professional experience with C# and .NET Core. * Strong Front End development experience with JavaScript and React (Angular experience is also acceptable). * Strong HTML, CSS, and JavaScript fundamentals. * Experience building and consuming REST APIs. * Hands-on professional experience with Umbraco CMS, including Umbraco 13 or a newer version. * Experience working with Microsoft SQL Server. * Experience using Git and CI/CD workflows. * Ability to work independently with minimal supervision and manage priorities effectively. * Advanced English communication skills, both written and verbal. Nice to Have * Familiarity with Node.js. * Experience using AI-assisted development tools as part of the software development workflow. * Experience optimizing web performance, page speed, and Front End user experience. * Experience building reusable Front End component libraries or design system implementations. * Experience working with AWS cloud services. * Previous experience in digital agencies or fast-paced client delivery environments. * Knowledge of accessibility standards and responsive design best practices. * Participation in architecture discussions and technical design decisions. * Strong ownership mindset with the ability to drive work from requirements through delivery. ## Description We are looking for a Senior Full-stack Engineer to contribute to multiple client-facing web projects, building and maintaining scalable applications using .NET technologies and modern Front End frameworks. This role is ideal for an engineer who enjoys working across the stack, developing Back End services and Front End experiences, integrating CMS-driven solutions, collaborating with multidisciplinary teams, and delivering high-quality technical implementations in a fast-paced agency environment. Responsibilities * Design, develop, and maintain full-stack web application features across multiple client projects. * Build scalable Back End services using C# and .NET Core. * Develop responsive and maintainable Front End applications using JavaScript and React or Angular. * Integrate CMS platforms, APIs, and third-party services to support content-driven digital experiences. * Participate in technical architecture discussions and contribute to technical decision-making. * Conduct and participate in code reviews to maintain engineering quality standards. * Collaborate closely with designers, strategists, producers, and fellow engineers throughout the development lifecycle. * Ensure code quality through testing, performance optimization, and adherence to development best practices. * Work independently while proactively communicating progress, risks, blockers, and recommendations. * Maintain technical documentation and support continuous improvement initiatives across projects. ## Related Videos - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [How a Small Team Shrank a Microsoft Monorepo by 94%](https://www.wearedevelopers.com/videos/1236-how-a-small-team-shrank-a-microsoft-monorepo-by-94) - [WeAreDevelopers LIVE – AI, Freelancing, Keeping Up with Tech and More](https://www.wearedevelopers.com/videos/1786-wearedevelopers-live-ai-freelancing-keeping-up-with-tech-and-more) - [NoLoJS - Avoiding JavaScript Cruft with HTML and CSS - Aaron T. Grogg](https://www.wearedevelopers.com/videos/1806-nolojs-avoiding-javascript-cruft-with-html-and-css-aaron-t-grogg) - [Web development best practices in 2021](https://www.wearedevelopers.com/videos/280-web-development-best-practices-in-2021) ## Related Articles - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [16 Best Free React UI Libraries in 2025](https://www.wearedevelopers.com/magazine/148-16-best-free-react-ui-libraries-in-2025) - [React Developer Salary [2023]](https://www.wearedevelopers.com/magazine/198-react-developer-salary-2023) - [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers) - [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)