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

About the Role

You will be joining one of our six cross-functional teams.

These are the CRM, Admin & Onboarding, 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 You

We’re looking for high achieving, full‑time Software Engineers to join our engineering team.

Someone who has a good understanding in web technologies and wants 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 your 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 features
• Implementing new AI features to turbocharge our customers’ daily tasks
• Improving the performance and scalability of our Graph QL and REST API
• Improving how we sync millions of sales emails and calendar events each month
• Working with Twilio’s API, Web Sockets, and Web RTC 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 Saa S platforms like Google’s G Suite, Zapier, and web conferencing providers Enhancing our web app with real‑time updates powered by Graph QL Subscriptions
• Leveraging the latest AI LLMs from providers like Open AI, Groq and Assembly AI
• Help manage our ever growing data processing needs…
• Billions of Mongo documents
• Millions and millions of rows of Postgre SQL 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…

• Senior 1 & 2 level candidates should have 5+ years of experience building modern back‑end systems.
• 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.
• 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.
• You have built web APIs that were Internet facing or supported other high volume loads.
• You have hands‑on production experience working with Mongo DB, Postgre SQL, Elasticsearch, or similar data stores.
• You have experience designing, scaling, debugging, and optimizing systems to make them fast and reliable.
• You have participated in code reviews and provided overall code quality suggestions to help maintain the structure and quality of the codebase.
• You care about the craftsmanship of the code and systems you produce.
• You are able to speak and write in English
• You are located in the USA (ET, CT, MT, PT)
• Bonus point if you have…
• Contributed open source code related to our tech stack.
• Led small project teams building and launching features.
• Built B2B Saa S products.
• Implemented features that leveraged AI to deliver unimaginable new product capabilities.
• Worked with complex architectures that support multiple APIs (e. g. REST, GQL, Web Sockets) as well as async task and event processing frameworks.

Benefits

• Competitive compensation including an organization‑wide goal‑based bonus
• Paid Time Off: 5 Weeks PTO upon joining + Winter Holiday Break and Summer Holiday Break. Each year with the company, you’ll receive 2 additional PTO days
• 80% Work Option: Work with your manager to choose between working 5 day weeks (standard full‑time) or 4 day weeks @ 80% pay
• 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

Compensation

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