Software Engineer, Agent Platform

Radical AI is seeking a Senior or Staff Software Engineer to build the agent platform powering materials discovery. The role focuses on developing production LLM-based agents, evaluation and infrastructure systems, end-to-end product features, data pipelines, and interfaces used by scientists and customers.

Responsibilities:

• Build the agents that design materials discovery campaigns, proposing novel compositions that are made and measured in our lab
• Build the tools and workflows behind them, such as scientific literature search, simulations and data analysis in a sandbox
• Build the evals that measure our agents, from benchmarks to LLM judges, and hill-climb against them to improve agent quality
• Instrument agents with tracing, token and cost accounting, and structured logs so you can debug them in production
• Work across model providers and adapt our agents as new models change what they can do
• Build Tetra, our SvelteKit application where customers follow and steer their campaigns
• Build Sentinel, our lab control panel
• Build how people chat with agents and review their work in both apps
• Evolve the Cortex data model for campaigns and experiments: protobuf schemas, MongoDB documents and migrations
• Build the pipelines that ingest and process scientific documents for our agents
• Ship each feature across every layer it touches: the data model, the agent, the API and the UI
• Write automated tests and evals on both sides of the API and contribute to CI/CD pipelines