Senior Software Engineer

Our app’s frontend is a single-page TypeScript web app mostly written in React (originally built with Backbone.js). Our mobile app is built using React Native. We bundle with Vite and target only modern browsers. We test with Vitest, React Testing Library, Playwright, and Chromatic (VRT). Our UI updates in near real-time and is styled via CSS modules and takes advantage of fun technologies like Websockets and WebRTC.

We care about performance (e.g. route-based code splitting or skeleton UI), maintainability, and testability of our frontend code. Our product development process is inspired by Shape Up. We sweat the UI/UX details and work collaboratively with the Product team throughout the design process. This means diving into lo-fi wireframes, and communicating continuously when those ideas are brought to life using Figma and code (Storybook).

Our frontend app is built on top of our REST API & GraphQL endpoints. Our backend tech stack consists of Python/Flask, MongoDB, Postgres, Elasticsearch, and Redis. We run our services in Docker on AWS.

We ❤️ open sourcing our code and ideas on our GitHub and on The Making of Close, our behind-the-scenes Product & Engineering blog. Check our projects such as react-custom-scroller, use-infinite-scroll, use-abortable-effect, and smart-tooltip-delay or insights from our day-to-day work on such as Under the Hood: Developing Close's AI-Powered Call Assistant, Cutting our Lead page LCP by half, and Highlights From a Complex Downshift.js Refactor.

About the Role

You would be joining one of our six cross-functional product development teams. These include the CRM, Admin & Onboarding, 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 teams here at Close.

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, Groq 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.
• Mid-level candidates should have ~3 years of similar experience and be eager to level up with the right opportunity.
• 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 (lower 48 timezones).
• Bonus points if you have...
• Experience implementing real-time (e.g. websockets, polling, etc.) web apps
• Experience working with GraphQL endpoints
• Utilized AI LLMs from providers like OpenAI, Groq 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

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