# Software Engineer

**Company:** [Mosaic](https://hotfix.jobs/companies/mosaic)
**Location:** New York, NY
**Role:** Fullstack Engineering
**Experience:** 2+ years
**Skills:** React, Node.js, Python, Go, Relational Databases, Cloud Infrastructure, APIs, LLMs, Observability, AI Agents
**Posted:** 2026-01-20

> 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.

## Job Description

## 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

## Similar roles

- [Software Engineer](https://hotfix.jobs/jobs/b0b9b3b7-23d6-4e8a-9f75-3a5a2de4bf30) - Hudl - Lexington, KY - $90k – $130k/yr
- [Full Stack Engineer, Link](https://hotfix.jobs/jobs/c5b0b835-f2b0-4b5e-a592-8b2f6ffd8fa9) - Stripe - New York, NY
- [Software Engineer 3, Documentation Platform](https://hotfix.jobs/jobs/8b499105-5345-417b-b016-31fa3a91e79c) - MongoDB - New York, NY - $106k – $209k/yr
- [Software Engineer](https://hotfix.jobs/jobs/45f21207-4a96-4a75-966c-e85be6558b67) - Traba - New York, NY - $140k – $200k/yr
- [Fullstack Engineer, Integrations](https://hotfix.jobs/jobs/00a02b7d-a170-4fb1-8537-2bbf99c3bbf3) - Commure - Mountain View, CA - $130k – $170k/yr

**Apply:** https://hotfix.jobs/jobs/c12694ec-516b-492b-b9e9-d17160d611f0
**Canonical:** https://hotfix.jobs/jobs/c12694ec-516b-492b-b9e9-d17160d611f0