> Markdown version of [/jobs/ext/2298670-application-developer-senior](https://www.wearedevelopers.com/jobs/ext/2298670-application-developer-senior). 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). --- # Application Developer - Senior - **Company:** Synergy Rents, LLC - **Location:** Reston, VA, United States (Remote available) - **Experience:** Expert - **Salary:** $100,000.0 - $120,000.0 - **Contract:** Permanent contract - **Skills:** ASP.NET, JavaScript (Programming Language), Agile Methodology, Artificial Intelligence, Software Applications, JIRA, Unit Testing, C Sharp (Programming Language), Continuous Integration, Relational Databases, PostgreSQL, Machine Learning, Object-Relational Mapping, Oracle (Applications), Scrum Methodology, Systems Development Life Cycle, Software Engineering, SQL Databases, Systems Integration, TypeScript, Enterprise Software Applications, ReactJS, Large Language Models, Git, Vue.js, Containerization, AngularJS, Kubernetes, Bitbucket, Front End Software Development, Restful APIs, Es2015, Mocha, Software Version Control, Jasmine, Docker, Jenkins - **Published:** August 29, 2026 - **Apply:** https://diversityjobs.com/main/sendform/8/8/28176/1/18127633?backUrl=%2Fcareer%2F18127633%2FApplication-Developer-Senior-Virginia-Reston ## About the Role * Professional experience with a modern frontend framework - Angular (preferred), React, or Vue. * Strong proficiency in TypeScript and modern JavaScript (ES6+). * Node.js development experience with a solid grasp of RESTful API design and best practices. * Experience using an ORM for database access; TypeORM preferred. * Proficiency with SQL and relational database design; Oracle and PostgreSQL preferred. * Experience writing and maintaining unit tests with an established framework (e.g., Jest, Jasmine/Karma, Mocha). * Proficiency with Git and familiarity with Jira, Jenkins, and Bitbucket, or equivalent version control, CI/CD, and issue-tracking tools. * Working knowledge of the software development lifecycle and Agile methodologies. * Experience using AI-assisted development tools and effective prompting techniques. Preferred Qualifications: * Experience building or maintaining cross-platform desktop applications (Electron, Tauri, or similar). * C# and ASP.NET experience for maintaining and migrating legacy applications. * Containerization and orchestration experience (Docker/Podman, Kubernetes). * Experience remediating CVEs and security findings across frontend and microservice codebases. * Familiarity with LLMs and integrating AI/ML capabilities into applications. Education Requirements: * Required: Bachelors degree in a relevant field. Citizenship & Clearance Requirements: * Required: US citizen with Public Trust ## Description Synergy Business Innovation & Solutions, Inc. is seeking a highly qualified GIS Developer to support the United States Coast Guard (USCG). This role will design, develop, and maintain enterprise web and desktop applications across the full software development lifecycle. Collaborate within a cross-functional Agile team and directly with clients to translate requirements into reliable, secure, and maintainable solutions., * Design, develop, test, deploy, and maintain enterprise applications and services across the full SDLC. * Contribute to technical design decisions, architecture discussions, and solution planning. * Gather, clarify, communicate, and document requirements directly from clients and stakeholders. * Write clean, testable, well-documented code and participate in peer code reviews. * Troubleshoot and resolve defects and performance issues across production and pre-production environments. * Contribute to Agile/Scrum ceremonies including sprint planning, estimation, and delivery. ## Related Videos - [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) - [Test Driven Development with JavaScript](https://www.wearedevelopers.com/videos/222-test-driven-development-with-javascript) - [Improving quality with Agentic AI with Rovo Dev and Xray](https://www.wearedevelopers.com/videos/2005-improving-quality-with-agentic-ai-with-rovo-dev-and-xray) - [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) - [Navigating the Future of Junior Developers in Tech](https://www.wearedevelopers.com/videos/1280-navigating-the-future-of-junior-developers-in-tech) - [Form Validation. 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