Arca - Member of Technical Staff, Agent Platform

deCircle•New York, NY

11d•$200,000 - $300,000•Onsite

About The Position

As a Member of Technical Staff focused on Applied AI, you'll own Arca's AI stack end to end. One framing the team keeps coming back to: agents are the primary users of the system of record. Everything built (the data models, the APIs, the UI) has to work for a non-human user that operates at scale, across every client, all the time.

Requirements

4 - 10 years of experience in full-stack or backend engineering, building LLM-powered agent systems
Comfortable where "correct" isn't always obvious; energized by probabilistic systems and rigorous about evaluation infrastructure
Careful with consequences: agents here touch real retirement savings and estate plans
Moves fast and treats evaluation and iteration as part of shipping
High bar for quality; spots AI slop instantly and leaves systems better instrumented than found
Kind, direct, low-ego; gives candid feedback and thrives in an in-person team

Responsibilities

Build a general agent capable of complex, multi-step tasks (planning, sandboxed code execution, web search, retrieval) that powers a "do anything" experience for advisors.
Develop ambient agents that act on behalf of clients and advisors: triaging email, processing meetings, drafting communications, surfacing what needs attention before anyone asks.
Create the agent harness that orchestrates LLMs, context, tools, retrieval, and business logic into something coherent and reliable.
Design generative UI and human-in-the-loop interfaces where the agent and advisor genuinely collaborate, not just take turns.
Implement evaluation infrastructure that holds two bars at once: high-correctness financial data and subjective, judgment-heavy tasks.