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

Close is a bootstrapped, profitable company with a 100% remote team focused on building a communication-focused CRM for small scaling businesses. The Senior Software Engineer will collaborate with cross-functional teams to design, implement, and launch user-facing features while improving backend systems and performance.

Responsibilities:

• Conceiving, designing, building, and launching new user-facing features
• Implementing new AI features to turbocharge our customers’ daily tasks
• Improving the performance and scalability of our GraphQL and REST API
• Improving how we sync millions of sales emails and calendar events each month
• Working with Twilio's API, WebSockets, and WebRTC to improve our calling features
• Building user-facing analytics features that provide actionable insights based on sales activity data
• Improving our Elasticsearch-backed powerful search features
• Improving 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 providers
• Enhancing our web app with real-time updates powered by GraphQL Subscriptions
• Leveraging the latest AI LLMs from providers like OpenAI, Groq and AssemblyAI
• Help manage our ever growing data processing needs
• Billions of Mongo documents
• Millions and millions of rows of PostgreSQL data
• 55 Terabytes of logs / month
• 500 billion OTEL spans over the last 30 days
• 10+ million events / day
• Tens of thousands of docker containers
• 7 million minutes of call recordings / month
• Petabytes / month of network traffic

Requirements:

• 5+ years of experience building modern back-end systems for Senior 1 & 2 level candidates; 8+ years for Staff level candidates
• Professional Python experience is preferred but a working knowledge of Python with additional experience in other languages is acceptable if you have a desire to work with Python
• Experience building web APIs that were Internet facing or supported other high volume loads
• Hands-on production experience working with MongoDB, PostgreSQL, Elasticsearch, or similar data stores
• Experience designing, scaling, debugging, and optimizing systems to make them fast and reliable
• Participation in code reviews and providing overall code quality suggestions to help maintain the structure and quality of the codebase
• Care about the craftsmanship of the code and systems you produce
• Ability to speak and write in English
• Located in the USA (ET, CT, MT, PT)
• Contributed open source code related to our tech stack
• Led small project teams building and launching features
• Built B2B SaaS products
• Implemented features that leveraged AI to deliver unimaginable new product capabilities
• Worked with complex architectures that support multiple APIs (e.g. REST, GQL, WebSockets) as well as async task and event processing frameworks