Senior Full Stack Engineer; Front End

eSimplicity is a modern digital services company that works across government, partnering with our clients to improve the health and lives of millions of Americans, ensure the security of all Americans—from soldiers and veterans to kids and the elderly, and defend national interests on the battlefield. Our engineers, designers, and strategists cut through complexity to create intuitive products and services that courageously equip Federal agencies with solutions to transform today for a better tomorrow for all Americans.

Full‑time

We are seeking a Senior Full Stack Engineer (Front End) to serve as a consultative partner to internal teams and clients on Agentic AI and modern web delivery. You will lead discovery conversations, translate ambiguous needs into clear technical options, and propose pragmatic solutions—then help prototype and ship them end‑to‑end. You will help define engineering practices and standards at eSimplicity while staying hands‑on across the stack with a strong front‑end focus and adapting as project needs change.

• Lead discovery and consulting sessions with clients and internal teams to clarify goals, constraints, and success metrics; separate true needs from wants.
• Propose Agentic AI‑enabled solutions: identify high‑ROI opportunities; outline architectures for agent orchestration, tool integrations, data access, and guardrails; communicate tradeoffs and risks.
• Prototype and deliver frontend‑first experiences in React/Type Script with Tailwind or CSS‑in‑JS; build accessible, reusable components and maintain design system consistency.
• Design, build, and iterate on secure APIs (REST/Graph
  
  QL; OpenAPI), integrations, and data flows using Node.js (preferred) or Python; leverage Postgres and Redis.
• Drive consistency and quality across front‑end implementations in multi‑app or micro‑frontend environments.
• Communicate clearly: author decision records, design docs, runbooks, and client‑facing summaries; present options and recommendations to mixed audiences.
• Participate in Agile processes including daily standups, demos, retrospectives, and sprint planning; collaborate closely across engineering, Dev Ops, UX, Product, and Scrum Master roles.

• Minimum of 7 years related experience delivering production web applications on small, cross‑functional teams.
• Exceptional communication and writing skills; adept at facilitation, stakeholder alignment, and translating complex topics for mixed audiences.
• Demonstrated consultative problem‑solving: discovery, option framing, impact/risk analysis, and solution proposals.
• Hands‑on experience enabling Agentic AI solutions (e.g., multi‑step/agent orchestration, tool‑use integration, prompt/eval harnesses, safety/guardrails).
• Expert‑level proficiency in at least one of the following languages:
  Type Script, JavaScript, Python.
• Proficiency in front‑end tooling such as Vite, Webpack, Storybook, ESLint, Prettier.
• Experience building dynamic forms and admin panels using JSON Schema and React‑based builders.
• Experience with Tailwind CSS, CSS‑in‑JS patterns, and responsive mobile‑first development.
• Familiarity with web accessibility (WCAG and Section 508) and performance optimization best practices.
• Experience with modern web application frameworks such as React.js, Next.js, and Node.js.
• Testing with Jest and Testing Library plus Playwright or Cypress; BDD with Cucumber is a plus.
• Deep understanding of APIs; familiarity with JSON, Web APIs, REST APIs, JSON‑RPC, RESTful practices, and Graph
  
  QL; experience defining APIs with OpenAPI.
• Experience using modern, open‑source software frameworks to prototype and deploy full‑stack web applications, including all aspects of server‑side processing, data storage, networking, content delivery, and monitoring.
• Experience with Docker containerization and deployments.
• Extensive experience using Git and CI/CD platforms to deliver safe releases at a rapid rate.
• Hands‑on experience with AWS cloud services.
• Experience working on a fully integrated Agile product team smaller than 10 people.
• A demonstrated preference for the right amount of unit and integration tests, across a variety of…