Senior Front End Developer Security Clearance

Position: Senior Front End Developer with Security Clearance
Strategic Analysis, Inc. is an Equal Opportunity Employer. Senior Front End Developer (#26-118) Job Code:26-118

Location:

Washington, D.C.
FT/PT Status:

Full Time
Required Clearance:

Public Trust
Salary Range:$140k-$160k Strategic Analysis, Inc. (SA) Is seeking a Senior Front End Software Developer for the Advanced Research Projects Agency for Health (ARPA-H) Overview: GRACE is ARPA-H's production AI assistant. We've shipped the first generation of agentic AI, and now we're moving quickly to go deeper: user-built agents, multi-agent orchestration, and a platform teams can extend themselves. We are a small, startup-minded team that ships fast and owns what we build end-to-end.

We are looking for a senior front-end-leaning full-stack developer to own the experience layer of GRACE: the chat interface, the rich rendering of AI output, and the interaction patterns that make an agentic system feel trustworthy and fast. The front end is where users decide whether GRACE is reliable and worth using. You will own that surface, while operating within the privacy, security, and responsible-use requirements of our mission and the federal environment.

Responsibilities:
Own the Front-End Experience
• Own the GRACE front end end-to-end: the Chainlit-based chat application and the React/Type Script components and interaction patterns layered on top of it
• Own the rendering pipeline for rich AI output: streaming responses, markdown, code blocks, tables, citations, diagrams (Mermaid), maps (GeoJSON), and generated images, so that complex output is legible and trustworthy
• Design and build interaction patterns for agentic workflows: tool-call progress, multi-step reasoning states, human-in-the-loop confirmations, and graceful handling of long-running or partial responses
• Apply industry best practices and emerging front-end patterns specific to agentic AI: streaming UX, agent and tool-call visibility, and interfaces for user-built and multi-agent workflows
• Own client-side state, streaming, and real-time updates (Web Socket/SSE), so the interface stays responsive while the backend is still working
• Build file upload, document preview, and results-display experiences for GRACE's knowledge search and research workflows Work Across the Stack Work close to the application layer in Python where Chainlit lives; customize rendering, session handling, and interaction behavior beyond what the framework gives you out of the box
• Partner with backend engineers on the API contract the front end consumes; shape it so it serves the user experience, and implement the glue when the boundary is fuzzy
• Implement front-end-facing integrations with GRACE's data sources and APIs, including LLM provider outputs, knowledge search, and tool results
• Write production-quality code across the stack: readable, tested, reviewed, and documented Partner with a human-centered designer and own quality, performance and accessibility Requirements:
• Bachelor's or Master's in Computer Science, a related field, or equivalent practical experience
• 7+ years of professional software engineering experience building and operating production web applications, with a primary focus on the front end
• Experience designing and building for AI, LLM, chat, or agentic products: streaming responses, citation and source display, tool-call visibility, and building for uncertain or probabilistic output
• Working knowledge of industry best practices and front-end patterns specific to agentic AI (streaming UX, agent and tool-call visibility, human-in-the-loop, multi-agent workflows)
• Strong proficiency in Type Script/JavaScript and deep, hands-on expertise with React and its modern ecosystem (hooks, state management, component architecture)
• Working proficiency in at least one backend language (Python strongly preferred, given Chainlit) and comfort operating across the client/server boundary
• Proven experience shipping complex, interactive UIs in high-velocity environments where you owned features end-to-end
• Strong CSS and responsive design fundamentals
• Experience with real-time UI patterns: streaming responses, Web Sockets or SSE, and optimistic/partial…