At Close, we're building the sales communication platform of the future. With our roots as the very first sales CRM to include built-in calling, we're leading the industry toward eliminating manual processes and helping companies to close more deals (faster). Since our founding in 2013, we've grown to become a profitable, 100% globally distributed team of 90+ high-performing, happy people that are dedicated to building a product our customers love.

Our backend tech stack currently consists primarily of Python Flask web apps with our TaskTiger scheduler handling many of the backend asynchronous task processing chores. Our data stores include MongoDB, PostgreSQL, Elasticsearch, and Redis. The underlying infrastructure runs on AWS using a combination of managed services like EKS, MSK, RDS and ElasticCache and non-managed services running on EC2 instances. All of our compute runs through CI/CD pipelines that build Docker images, run automated tests and deploy to our Kubernetes clusters.

Our backend primarily serves a well-documented public API and GraphQL endpoint that our front-end JavaScript app consumes. Our infrastructure is heavily automated using Terraform, Ansible and other AWS tools.

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 Webpack and target only modern browsers. We test with Jest, React Testing Library, and Playwright. Our UI updates in near real-time and is written in LESS/CSS (with flexbox and grid layout) using CSS modules and takes advantage of fun technologies like Websockets and WebRTC.

We care about performance (e.g. route-based code splitting), 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.

• The Making of Close – Our behind-the-scenes Product & Engineering blog
• Jobs at Close – We're hiring for our 100% remote team
• About Us – Learn about us
• API – Our REST API for developers wanting to integrate with Close