Senior Front End Developer (#26-118)

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/TypeScript 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 (WebSocket/SSE), so the interface stays responsive while the backend is still working

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