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Founding Engineer

New York, NY (On-site)

About the job

Department: Engineering

About the Role

Multiplier is building an AI platform for professional investors, designed to bring all of their investment research, data, models, and workflows into one place. Think of it as an IDE for investors, allowing both humans and AI agents to work together more effectively.

The company believes AI should complement human expertise rather than replace it. Its platform brings together fundamental data, email, trade history, risk metrics, research, charting, portfolio information, and market news into a single workspace.

Launched in May, Multiplier is already live with six hedge funds and backed by Y Combinator, Lux Capital, the Chairman of Fortress, and co-CIOs of Bridgewater, among others.

This is a highly hands-on, full-stack engineering opportunity where you'll work directly on the product, solve complex technical challenges, and build features that directly impact how professional investors use AI. You'll have significant ownership from day one, working across infrastructure, AI integrations, product development, client implementations, and internal tooling.

What You'll Do

  • Build and improve a full-stack AI platform that brings together investment data, research, models, and workflows into one workspace.

  • Design and implement intuitive user experiences for non-technical users working with AI agents.

  • Work on AI infrastructure, including model routing, post-training providers, benchmarks, and prompt optimization.

  • Build and deploy custom AI workflows, agent capabilities, and factor models for different types of investors.

  • Develop internal tools and automation to improve client onboarding and streamline engineering workflows.

  • Build data pipelines for processing large volumes of documents and integrating alternative data sources.

  • Develop systems for managing authentication and integrations across multiple enterprise platforms.

  • Work directly with clients to understand their needs, solve technical challenges, and turn vague product requests into working features.

  • Debug and improve complex deployments, including on-premise environments and enterprise infrastructure.

  • Improve application performance, reliability, and overall product quality.

  • Review AI agent traces and outputs to identify opportunities to improve prompts and system behavior.

  • Incorporate manual quality assurance into automated testing and CI/CD workflows.

What You'll Bring

Required:

  • At least 2 years of professional software engineering experience.

  • Strong ability to work across the full stack, taking projects from initial concept through implementation and deployment.

  • Ability to move quickly, manage multiple priorities, and deliver high-quality work in a fast-paced environment.

  • Strong product instincts and the ability to make thoughtful UX decisions when building tools for non-technical users.

  • High ownership mentality and the ability to take responsibility for significant projects early on.

  • Ability to clearly explain technical decisions and complex concepts to non-technical audiences.

  • Willingness to work in-office five days per week and operate in a demanding, high-intensity environment.

  • Genuine interest in financial markets, investing, and learning the domain.

Nice to Have:

  • Experience in full-stack engineering roles.

  • Experience in client-facing engineering, product-focused engineering, or Forward Deployed Engineering (FDE) roles.

  • Experience building AI-powered products, working with AI agents, or integrating language models into applications.

  • Experience working directly with investors, financial data, hedge funds, or investment research.

  • Experience as a professional investor or stockpicker.

  • Interest in founding a company or working in an early-stage startup environment.

Why Join Multiplier

  • Significant Ownership: Take on major engineering projects early and have a direct impact on the product and company's direction.

  • Cutting-Edge AI Development: Work on an AI platform focused on bringing human expertise and AI agents together in a sophisticated industry.

  • Broad Technical Exposure: Work across full-stack development, AI infrastructure, model integrations, data pipelines, and enterprise systems.

  • Direct Client Impact: Work closely with demanding, sophisticated users and build solutions that solve real-world investment challenges.

  • Early-Stage Opportunity: Join a growing company that launched in May and is already working with six hedge funds.

  • Strong Backing: Work at a company backed by Y Combinator, Lux Capital, and prominent leaders in the investment industry.

Location: In-office, five days per week.

Multiplier is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, veteran status, or any other legally protected characteristic. Salary history is not required or considered during the hiring process. Criminal history will only be considered after a conditional offer of employment, consistent with the NYC Fair Chance Act.

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