As a Fullstack Engineer at Mosaic, you’ll build product experiences that investors and bankers rely on to run high-stakes deal processes. You’ll work across the stack—from sleek, high-trust interfaces to backend services that power modeling, ingestion, collaboration, and workflow automation.
This is a role for builders who want real ownership. You’ll ship features end-to-end, collaborate tightly with product and design, and help establish the technical foundations for a platform used in mission-critical environments. You’ll tackle challenging problems like structured financial computation, document ingestion, auditability, permissions, real-time collaboration, and performance at scale.
Your work will directly impact how the world’s most sophisticated financial teams evaluate acquisitions, credit investments, and major corporate decisions.
Key Responsibilities
Build End-to-End Product Experiences
Own features from idea → design → implementation → testing → deployment
Build intuitive, polished UI workflows that feel fast and trustworthy
Ship backend APIs and services that support complex user actions and data flows
Design Systems that Scale
Improve the architecture of core systems powering modeling and analysis
Write clean, maintainable, well-tested code that raises the team’s bar
Ensure performance and reliability for workflows used in live deal environments
Work in a High-Trust, High-Accuracy Domain
Build with auditability and correctness in mind
Help define patterns for permissions, versioning, and reproducibility
Balance velocity with quality in a product where accuracy matters
Collaborate Deeply with Product & Customers
Partner with product, design, and GTM teams to translate needs into product
Incorporate feedback from real customer workflows (often built in Excel)
Contribute to roadmap shaping through technical insight and execution
Drive Engineering Excellence
Participate in code reviews, technical design discussions, and system planning
Improve developer tooling, observability, and internal infrastructure
Help define best practices as the engineering org scales
Who We’re Looking For
Fullstack Product Builder
2–6+ years of experience building modern web applications
Comfortable working across frontend + backend and owning features end-to-end
Strong Frontend Fundamentals
Experience building clean UIs with modern frameworks (React preferred)
Strong instincts around usability, quality, and UI performance
Backend & Systems Capability
Experience building APIs and services (Node, Python, Go, etc.)
Strong data modeling instincts and comfort working with relational databases
Familiarity with cloud infrastructure and production systems
High Ownership / Startup Mentality
Self-starter who thrives in fast-moving, unstructured environments
Bias toward action, shipping, and iterating quickly with the team
Thoughtful Collaborator
Clear communicator who enjoys working cross-functionally
Excited to pair, review code, and build internal momentum
Bonus (Not Required)
Experience building tools for finance, analytics, or high-compliance workflows
Familiarity with AI product patterns (LLMs, agents, structured extraction)
Experience with workflows involving spreadsheet-like interactions
Exposure to observability tooling, performance profiling, or infra work
Why Join Mosaic?
Build the AI-powered modeling and workflow platform for private markets
Work on hard technical problems with real-world stakes and complexity
Join a team of top-tier operators across finance and technology
Have major product and technical influence as the company scales
Ship software that immediately impacts how the world’s top firms make decisions
Play a key role in shaping Mosaic’s product roadmap and influencing its growth.
Enjoy opportunities for career growth and leadership in a dynamic, fast-paced environment.
Make a tangible impact by helping customers succeed and drive innovation in the industry.
What’s in it for you?
This is a full-time position with
A competitive base salary; and
An early-stage start-up equity package designed to create life-changing wealth when we win as a team.
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!
