Principal AI Engineer

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/.

Placement in the range will vary based on job responsibilities and scope, geographic location, candidate’s relevant experience, and other factors.

Base salary is only part of the total compensation package. Depending on the position and eligibility requirements, the offer package may also include bonus or other variable compensation.   

We offer a wide range of benefits to meet your evolving needs and help you live your best life at work and at home.  These benefits include comprehensive health care coverage and emotional well-being support, market-leading retirement, generous paid time off and parental leave, charitable giving employee match program, and educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career.  Note, the application window closes when the position is filled or unposted.

Please be advised that Fidelity’s business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories.

Most roles at Fidelity are Hybrid, requiring associates to work onsite every other week (all business days, M-F) in a Fidelity office. This does not apply to Remote or fully Onsite roles. Please consult with your recruiter for the specific expectations for this position.