Job Description
Job DescriptionSenior Frontend Engineer
New York City, NY · Washington, D.C. · Philadelphia, PA · Hybrid · Full-time
Compensation: $150,000–$190,000 + meaningful equity
About the Company
A seed-stage, AI-native startup building vertical AI for a high-stakes corner of the construction industry. The product pairs every client with an AI-powered assistant that compresses days of expert work into minutes — pulling scope from complex documents, managing back-and-forth, and generating polished output at a speed no individual could match. VC-backed, growing fast, with an aggressive plan to scale over the next year.
Founded 2023 · 11–50 people · Industry: Vertical AI / Construction Tech
The Role
You'll own the interface where clients work with their AI assistant, from onboarding through daily workflow. Today the product is built with a server-rendered HTMX + Flask approach; the team is splitting its internal and external portals, and the external experience is being rebuilt in React. A key part of this role is spearheading that migration — and the shift from a traditional software interface toward a human-plus-AI co-working workspace where users come in and actually finish the task, not just view data. This is an engineering role, not a design role: there is already a designer, and this person owns the frontend build.
What you'll be doing
- Own the end-to-end experience users rely on, from onboarding through daily workflow
- Design interaction patterns that surface what the AI is doing and keep expert users in control
- Build responsive, performant interfaces on HTMX, Flask templates, and modern CSS/JS, and spearhead the external move to React
- Partner closely with the designer and backend engineers to turn complex workflows into something that feels simple
- Own performance, accessibility, and polish — details close deals
Tech stack: HTMX, Flask (Python), modern CSS/JS; external product migrating to React
Requirements
- 5+ years product-facing frontend
- Strong HTML / CSS / JS fundamentals
- React (can lead HTMX to React migration)
- AI-native builder
- Hybrid: Philadelphia, New York, or DC
- Portfolio
Green Flags
- Coded pre-AI, so fundamentals are deep enough to pick up HTMX quickly, and now genuinely AI-native in how they build
- Early-stage team experience: collaborative, comfortable owning a piece end to end
- Understands the backend (Python) well enough to be effective, and translates design intent into polished frontend
- Simplifies complex workflows for users in a B2B setting, and can manage stakeholders (designer, backend, founder)
- Strong portfolio or side project, and real interest and opinions on human-AI co-working interfaces
Red Flags
- Purely B2C background with no complex-workflow or B2B experience
- Five years but purely IC at a large company, no 0-to-1 ownership, no compelling side project or portfolio
- Not genuinely AI-native in their building
- A product designer looking for a design role rather than an engineer who owns the build
- Cannot be based in or commute from Philadelphia, New York, or DC (remote-only is not a fit)
Why Join
- Meaningful equity on the generous side, as an early hire
- Hybrid schedule with a real HQ for in-person collaboration
- Visa sponsorship (H-1B transfer / F-1 OPT)
- Spearhead a greenfield React rebuild and shape genuinely novel human-AI co-working interfaces
Details
- Location — New York City, NY · Washington, D.C. · Philadelphia, PA
- Work policy — Hybrid (HQ for in-person collaboration; occasional HQ travel)
- Compensation — $150,000–$190,000 + equity
- Visa sponsorship — H-1B transfer / F-1 OPT
- Employment type — Full-time