Founding Designer

About Mosaic

Mosaic is the AI-driven deal modeling platform for private markets, used by leading investors and advisors including Warburg Pincus, CVC, New Mountain, and Evercore. Mosaic automates and standardizes core deal analyses-such as LBOs and DCFs-so investment teams can move faster, reduce spreadsheet risk, and spend more time on investment judgment.

Mosaic's platform combines deterministic, rules-based calculations with AI-powered ingestion and agentic workflows to generate replicable, audit-ready outputs that private equity, private credit, and investment banking teams can trust across billion-dollar deals.

Mosaic is on a mission to build the AI-driven operating system for the world's most sophisticated investors and their advisors. We're growing quickly and are hiring across engineering, product, customer enablement, and go-to-market teams.

For those excited to sit at the intersection of high finance and technology, Mosaic offers a rare opportunity to shape how the industry operates for decades to come.

Read more about our story:

• Bloomberg
• Financial Times
• NY Post

About the Role

Mosaic is hiring a Founding Designer to shape the product experience from the ground up.

This is a high-ownership role for someone who wants to define design at a company building software for some of the most sophisticated decision-makers in the world. You'll work directly with product and engineering leadership to create an intuitive, high-trust platform that transforms how deals get analyzed, reviewed, and executed.

Private market investing runs on spreadsheets, documents, and legacy workflows-and Mosaic is building the next generation of tooling: AI-powered, auditable, and built for speed. As Founding Designer, you'll turn complex workflows into simple, elegant experiences and establish Mosaic's design principles, systems, and craft bar.

You'll be involved across the full lifecycle: customer discovery, workflow design, prototyping, UI systems, interaction design, and shipping product alongside engineers. The scope is broad, the pace is high, and your work will define how Mosaic feels for years to come.

Key Responsibilities
Own Design End-to-End

• Lead design for key product areas from early discovery through launch
• Translate messy real-world workflows into clear, intuitive product flows
• Produce high-quality UI and interaction design for core surfaces

Build a High-Trust, High-Performance Product Experience

• Design experiences that feel fast, precise, and dependable
• Create interfaces that support accuracy, auditability, and confidence
• Design for power users who live in tools all day (bankers, investors, and deal teams)

Develop Mosaic's Design System & Visual Language

• Establish foundational components, patterns, and UX principles
• Drive consistency across the product while keeping velocity high
• Raise the bar on craft, clarity, and usability across everything we ship

Partner Cross-Functionally and Influence the Roadmap

• Collaborate closely with product, engineering, and GTM teams
• Bring customer insight into product decisions and prioritization
• Use prototypes to explore directions, align stakeholders, and move quickly

Be a Builder in a Fast-Growing Startup

• Operate with high autonomy and ownership in an unstructured environment
• Move quickly and iteratively-shipping, learning, refining
• Help define how design works at Mosaic: process, tools, rituals, and culture

Who We're Looking For
Strong Product Designer with Founder-Level Ownership

• 4+ years of product design experience (or equivalent craft + portfolio)
• Excited to be hands-on, scrappy, and deeply embedded in the product

Systems + UX Thinking

• Strong instincts for information architecture, complex workflows, and usability
• Ability to design products that support expert users and dense concepts

Exceptional Craft

• High attention to detail across UI, interaction, typography, layout, and polish
• Ability to make complex software feel simple and calm

Collaborative and Clear Communicator

• Comfortable working directly with engineers and shipping together
• Ability to explain decisions, iterate with feedback, and build alignment

Customer-Obsessed Product Mindset

• Loves talking to users, watching workflows, and identifying what matters
• Can synthesize feedback into sharp product insights and design direction

Bonus (Not Required)

• Experience designing for fintech, B2B SaaS, or workflow-heavy products
• Familiarity with spreadsheet-like UI patterns and analytical tooling
• Comfort designing for AI-driven workflows (extraction, review, agents, automation)
• Some front-end fluency (you can speak dev, understand constraints, and move fast)

Why Join Mosaic?

• Define design at a company reinventing core workflows in private markets
• Work on high-impact, high-complexity product problems with real stakes
• Partner with a world-class team across engineering, product, and finance
• Shape the future of how investment firms execute deal analysis
• Build a product used by elite investors and advisors on billion-dollar decisions

What's in it for you?

This is a full-time position with:

• A competitive base salary
• A meaningful early-stage equity package designed to create life-changing wealth as Mosaic scales

Other perks & benefits:
Health, vision & dental coverage
Unlimited PTO
Unforgettable team building events, offsites, and happy hours (feel free to ask about it during the interview )

If you find yourself waking up every day seeking:

• To be challenged by your peers
• To grow your skillset in building technology businesses
• To experience the joys, learning opportunities, and growing pains of doing something completely new
• To have a shot at a generational wealth creation event

...then Mosaic is definitely the place for you.

We're looking to hire people who take ownership, communicate openly, have an entrepreneurial mindset, and are excited to bring a totally new technology to an incredible industry. We encourage all candidates to apply even if your experience doesn't exactly match up to our job description. We are committed to building a diverse and inclusive workspace where everyone (regardless of age, religion, ethnicity, gender, sexual orientation, and more) feels like they belong. We look forward to hearing from you!