Senior Software Engineer - Backend/Python (USA Only - 100% Remote)

About UsClose is a bootstrapped, profitable, 100% remote, ~100 person team of thoughtful individuals who prioritize taking ownership and making a meaningful impact. We’re eager to make a product our customers fall in love with over and over again.We 💛 small scaling businesses. Since 2013, we’ve been building a CRM that focuses on better communication, without the hassle of manual data entry or a complex UI. We are out to supercharge sales productivity with the most modern, thoughtfully designed, all-in-one, communication-focused CRM. Our backend tech stack 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. We have CI/CD pipelines that build Docker images, run automated tests and deploy to Kubernetes clusters. We also use these images in our local development environment allowing coding locally against all of our services. We have a well-documented public API that is consumed by our front-end JavaScript app as well as numerous integrations. Our infrastructure is heavily automated using Terraform, Ansible and other AWS tools.We love open sourcing our code and ideas on our GitHub and on The Making of Close, our behind-the-scenes Product & Engineering blog. Check out our open source projects like SocketShark, TaskTiger, LimitLion and ciso8601.About the RoleYou will be joining one of our six cross-functional teams. These are the CRM, Growth, Conversations, Messaging & Scheduling, Automations & Integrations and Data Insights teams. You will be regularly collaborating with other backend & frontend engineers, product managers, designers, and other teams here at Close.About YouYou are a curiosity-led, high-performing, full-time Software Engineer who is impassioned by the impact your work can have on your fellow team members and, ultimately, our end users. You value collaboration, knowledge sharing, and have a good understanding of web technologies and want to help design, implement, launch, and scale major systems and 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're able to manage time well, communicate effectively, and collaborate in a fully distributed team.Come help us with projects like...Conceiving, designing, building, and launching new user-facing featuresImplementing new AI features to turbocharge our customers’ daily tasksImproving the performance and scalability of our GraphQL and REST APIImproving how we sync millions of sales emails and calendar events each monthWorking with Twilio's API, WebSockets, and WebRTC to improve our calling featuresBuilding user-facing analytics features that provide actionable insights based on sales activity dataImproving our Elasticsearch-backed powerful search featuresImproving our internal messaging infrastructure using streaming technologies like Kafka and Redis Building new and enhancing existing integrations with other SaaS platforms like Google’s G Suite, Zapier, and web conferencing providersEnhancing our web app with real-time updates powered by GraphQL SubscriptionsLeveraging the latest AI LLMs from providers like OpenAI, Groq and AssemblyAIHelp manage our ever growing data processing needs…Billions of Mongo documentsMillions and millions of rows of PostgreSQL data55 Terabytes of logs / month500 billion OTEL spans over the last 30 days10+ million events / dayTens of thousands of docker containers7 million minutes of call recordings / monthPetabytes / month of network trafficRequirements...Senior 1 & 2 level candidates should have 5+ years of experience building modern back-end systems. Staff level candidates should have 8+ years of exper ... (truncated, view full listing at source)