Principal AI Engineer

Fidelity Investments • Smithfield, RI

1d

About The Position

Principal AI Engineer The Role Fidelity Labs is looking for a Full-stack Software Engineer to help us build Generative AI powered applications for investment. You will join a new startup team to apply cutting edge Agentic AI technologies to build exciting new products, from ideation to deployment. What You will Work on Design, build, and integrate agentic applications (LangGraph and/or Google ADK) end-to-end. Develop and maintain APIs with FastAPI and REST best practices. Implement prompt/context engineering for LLM agents. Create indexing and retrieval pipelines (embeddings, vector stores, RAG). Integrate external tools, services, and data sources into agent workflows. Build, connect, and maintain user-facing apps with React and Next.js. Lead UI architecture, state management, and performance optimization. Write clean, tested, production-quality code on both frontend and backend. The Experience and Skills You Bring Bachelor’s degree in computer science, engineering, or similar technical discipline 5–7 years full-stack engineering experience in Python and modern frontend (React/Next.js). 5+ years Python (features, packaging, testing, async). 4+ years React and Next.js (components, hooks, routing, SSR/SSG). 3+ years API development with FastAPI and REST. 1+ years with agent frameworks (LangGraph, Google ADK, or similar). Proven ability to develop full end-to-end integrations and connect backend services with frontend applications. Hands-on experience with: Prompt/context engineering, Vector databases/indexing and LLM orchestration frameworks Strong testing skills (unit and E2E) across frontend and backend. 1+ years DevOps (CI/CD, containerization, cloud, monitoring). Multi-agent systems, tool calling, workflow orchestration. Asynchronous/event-driven architectures. D3/Plotly graphing libraries. State management libraries like Redux. Experience with GraphQL. The Team We are Fidelity Labs, Fidelity Investments’ in-house fintech incubator with a mission to build new businesses to drive growth for Fidelity. We seek to craft the future of our industry by building new products and services to improve the lives of the diverse set of customers, businesses and financial institutions we serve. Fidelity Labs is a dynamic workplace that combines the best parts of startup life—building from scratch, adapting quickly, and moon-shot ambition—with the scale and stability of an industry leader. We provide a safe space for startup teams to explore new business ideas, quickly test them with customers, and scale the most promising concepts within an existing business unit, or as a new venture. Learn more at https://labs.fidelity.com/.

Requirements

• Bachelor’s degree in computer science, engineering, or similar technical discipline
• 5–7 years full-stack engineering experience in Python and modern frontend (React/Next.js).
• 5+ years Python (features, packaging, testing, async).
• 4+ years React and Next.js (components, hooks, routing, SSR/SSG).
• 3+ years API development with FastAPI and REST.
• 1+ years with agent frameworks (LangGraph, Google ADK, or similar).
• Proven ability to develop full end-to-end integrations and connect backend services with frontend applications.
• Hands-on experience with: Prompt/context engineering, Vector databases/indexing and LLM orchestration frameworks
• Strong testing skills (unit and E2E) across frontend and backend.
• 1+ years DevOps (CI/CD, containerization, cloud, monitoring).
• Multi-agent systems, tool calling, workflow orchestration.
• Asynchronous/event-driven architectures.
• D3/Plotly graphing libraries.
• State management libraries like Redux.
• Experience with GraphQL.

Responsibilities

• Design, build, and integrate agentic applications (LangGraph and/or Google ADK) end-to-end.
• Develop and maintain APIs with FastAPI and REST best practices.
• Implement prompt/context engineering for LLM agents.
• Create indexing and retrieval pipelines (embeddings, vector stores, RAG).
• Integrate external tools, services, and data sources into agent workflows.
• Build, connect, and maintain user-facing apps with React and Next.js.
• Lead UI architecture, state management, and performance optimization.
• Write clean, tested, production-quality code on both frontend and backend.

Benefits

• comprehensive health care coverage and emotional well-being support
• market-leading retirement
• generous paid time off and parental leave
• charitable giving employee match program
• educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career

What This Job Offers

• Job Type: Full-time
• Career Level: Principal