Senior Software Engineer - Frontend/React (USA Only - 100% Remote)

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Location: United States
Job Type: full-time
Salary: $140K – $210K
Posted: March 7, 2026

Job Description

About the Role

You would be joining one of our six cross-functional product development teams. These include the CRM, Growth, Conversations, Messaging & Scheduling, Automations & Integrations and Data Insights teams. You will be working with other Frontend Engineers as well as Backend Engineers, Product Managers, Designers and other functional teams here at Close to drive initiatives across the finish line.

Come help us with projects like...

Conceiving, designing, building, and launching new user-facing features
Implementing new AI features to turbocharge our customers’ daily tasks
Working with Twilio's API, WebSockets, and WebRTC to improve our calling and SMS features
Building user-facing analytics features that provide actionable insights based on sales activity data
Enhancing our web app with real-time updates powered by GraphQL Subscriptions
Improving real-time collaboration user experience
Leveraging the latest AI LLMs from providers like OpenAI, Claude Code, and AssemblyAI
Expanding our frontend GraphQL usage
Extending our React component library

About You

We're looking for an experienced full-time Frontend Software Engineer to join our engineering team. Someone who has a solid understanding of web technologies and wants to help design, implement, and launch major user-facing features.

You’re comfortable working in a fast-paced environment with a small and talented team where you're supported in your efforts to grow professionally. You are able to manage your time well, communicate effectively and collaborate in a fully distributed team.

Senior 1 & 2 level candidates should have 5+ years experience building modern frontend single page applications in JavaScript, HTML, and CSS, with at least 3 years of that experience using React.
Staff level candidates should have 8+ years of experience.
You should have significant experience designing, debugging, and optimizing frontend applications to make them fast and reliable.
You have significant experience with REST APIs and thoroughly understand HTTP requests.
You have experience participating in code reviews and providing overall code quality suggestions to help maintain the structure and quality of the codebase.
You should have great product sense and be able to think through user experience issues before diving into the code, and you exhibit a love for great UI.
You care about the craftsmanship of the code and systems you produce.
You are located in the USA (ET, CT, MT, PT time zones).

Bonus points if you have…

Experience implementing real-time (e.g. websockets, polling, etc.) web apps
Experience working with GraphQL endpoints
Utilized models from AI companies like OpenAI, Anthropic and AssemblyAI in a production web app
An eye for design and experience with Figma, Sketch, Abstract, Photoshop, or similar
Led small project teams building and launching features
Contributed open source code (core or plugins) for a popular frontend framework such as React, Vue, or Angular
Built B2B SaaS products
Experience with sales or sales tools

Benefits

Competitive compensation including an organization-wide goal-based bonus
Paid Time Off: 4+ weeks of PTO upon joining + 2 extra days of PTO for each year you're with the company.
Six paid US holidays, including team-wide Winter and Summer breaks
Paid Parental Leave for primary and secondary caregivers
Sabbatical: After 5 years with the team, you’re eligible for a 1 month paid sabbatical
Healthcare (US residents): Medical, Dental, Vision with HSA option (US residents), Dependent care FSA (US residents)
401k (US residents): We match 6% contributions with immediate vesting

Our Values

Build a house you want to live in - Examine long-term thinking and action

No BS - Practice transparency and honesty, especially when it’s hard

Invest in each other - Build successful relationships with your coworkers and customers

Discipline equals freedom - Keep your word to yourself and others

Strive for greatness - Constantly challenge yourself and others

🎯 Who is this job for?

This role is ideal for a Senior Frontend Engineer (React) with 5+ years of experience building modern TypeScript-based SPAs and strong expertise in performance, debugging, and UI architecture. It suits someone who enjoys shipping major user-facing features, working with real-time technologies (WebSockets/WebRTC), REST/GraphQL APIs, and design systems, while collaborating closely with product and design teams in a fully remote SaaS environment. You should have strong product sense, care about code craftsmanship and testing, and be comfortable integrating modern AI features and real-time collaboration capabilities into complex frontend applications.

💬 Potential Interview Questions

How would you architect a large-scale React + TypeScript single-page application for a CRM used by thousands of businesses?
I would design a modular architecture with reusable components, strong TypeScript typing, and well-defined data layers. Clear separation between UI, state management, and API services ensures scalability and maintainability.
How do you optimize performance in complex React applications with real-time updates?
I use techniques such as route-based code splitting, memoization, virtualization for large datasets, and efficient state updates. Monitoring performance metrics and analyzing rendering behavior helps identify and resolve bottlenecks.
How would you implement real-time features using WebSockets or GraphQL subscriptions in a web application?
I would establish persistent connections for real-time events and update client state incrementally when new data arrives. Proper reconnection logic, event handling, and state synchronization ensure reliability.
What strategies do you use to ensure maintainable and testable frontend code?
I focus on modular components, clear abstractions, and separation of business logic from presentation. Automated tests with tools like React Testing Library and Playwright ensure confidence in critical workflows.
How do you design and maintain a scalable design system for a React application?
I build reusable components with consistent styling patterns, design tokens, and documentation in tools like Storybook. Versioning and strict design guidelines ensure consistency across teams.
How do you integrate REST and GraphQL APIs into a frontend architecture?
I create typed API service layers and manage server state carefully to ensure predictable data flows. Proper error handling, caching, and loading states improve user experience.
How do you approach debugging complex issues in a production frontend environment?
I analyze logs, network requests, and monitoring data to trace the issue to its root cause. Once identified, I implement fixes and add safeguards such as improved error handling or tests.
How would you implement AI-powered features in a SaaS frontend product?
I design interfaces that integrate AI responses smoothly into user workflows while providing transparency and user control. Performance, reliability, and fallback mechanisms are essential for production AI features.
How do you collaborate with product and design teams to deliver high-quality user experiences?
I participate early in design discussions, review wireframes, and provide technical input on feasibility and trade-offs. Continuous communication ensures the final implementation matches both product goals and UX expectations.
How do you balance rapid feature delivery with long-term code quality in a growing SaaS platform?
I favor incremental improvements while maintaining strong architectural boundaries and test coverage. This approach allows teams to ship quickly without accumulating excessive technical debt.

📋 Job Summary

Close is a profitable, fully remote SaaS company building a communication-first CRM that helps SMB sales teams work faster and close more deals. We’re hiring a Senior Software Engineer – Frontend (React) to design and ship major user-facing features in a real-time, high-performance single-page app built with React, TypeScript, GraphQL, and modern tooling like Vite and Playwright. You’ll collaborate with product, design, and backend teams to build scalable UI, integrate AI-powered features, and improve real-time collaboration and analytics experiences. This 100% remote US role offers $140K–$210K compensation plus bonus, strong benefits, and the opportunity to craft a polished product used by thousands of sales teams worldwide.