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MosaicMosaicNew York, NY

Software Engineer

Builds end-to-end product experiences for AI-driven financial modeling platform, owning features across frontend UIs and backend services for deal analysis, collaboration, and workflows. Requires 2-6+ years fullstack experience with React, APIs, databases, and cloud systems in high-trust environments.

Salary not listed
On-site2+ YOEFullstack Engineering

About the role

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

Skills

ReactNode.jsPythonGoRelational DatabasesCloud InfrastructureAPIsLLMsObservabilityAI Agents
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