Senior Frontend Engineer

About the Role

We’re looking for a seasoned engineer and frontend technical lead - someone who can design and ship complex product features from the first line of code to production launch.

This is a frontend-heavy role that demands full-stack fluency and a product mindset. You won’t just implement designs - you’ll work directly with product and design to shape them, making smart, user-focused tradeoffs along the way. You’ll spend much of your time in TypeScript + React, but you’ll also model data in Postgres, debug backend services, and work on integrations with the systems our customers rely on.

We’re a small, senior team building Siteline - a billing platform for the construction industry. The problems here are complex and nuanced, but rewarding: modeling deeply nested financial data, orchestrating complex API syncs, and making it all feel effortless for the user.

This position is based in our San Francisco office where our engineering team collaborates in-office 4 days a week. We're big believers in trust and in a healthy work/life balance: we want you to be productive and connected with the team, but we're not here to micromanage.

What You’ll Do

• Weigh in on product direction - collaborate with product and design to shape features, make tradeoffs, and ensure we’re solving the right problems for our users
• Build high-impact product features in TypeScript + React (functional components, hooks, MaterialUI)
• Apply a deep understanding of React state management & lifecycle to architect predictable, maintainable UIs
• Use GraphQL (Apollo) to power type-safe data flows between frontend and backend
• Model and manage complex nested/relational datasets for billing, compliance, and analytics
• Contribute to backend services to support frontend features
• Write clear design docs, QA plans, and deployment strategies for your projects

What We’re Looking For

• 4+ years of professional software engineering experience
• Proficiency in React - especially state management, lifecycle patterns, and Hooks
• Strong full-stack fluency - comfortable making schema changes, debugging API calls, and tuning backend queries
• Track record as a product engineer - you think deeply about user workflows, not just code paths
• Experience modeling relational data
• Proven ability to deliver projects end-to-end: from architecture to production
• Strong collaboration skills and a desire to work in a small, senior, high-trust team

Bonus points for:

• Experience in SaaS or complex web applications
• Construction tech, ERP, or billing/payments domain knowledge
• Accessibility best practices, or advanced PDF/file handling
• Building shared libraries or developer tooling
• Creativity - You like to express yourself creatively through hobbies or interests outside of coding

Why Siteline

• Small but mighty - everyone here is excellent at what they do
• Impact from day one - you’ll shape product decisions and see your work live quickly
• Challenging problems - not “yet another CRUD app”
• In-office with purpose - we collaborate in-person in our SF office centrally located near Union Square 4 days a week, with weekly team lunch
• Low-ego culture - smart, kind teammates who care about doing great work (and are really fun to be around)