Backend Software Engineering

Join to apply for the Senior Software Engineer - Backend role at Retell AI .
This range is provided by Retell AI. About Retell AI
Retell AI is using first principles to reimagine the call center with cutting edge voice AI. Our mission is to bring intelligence, empathy, and speed to every phone conversation between businesses and their customers.
Since launching 18 months ago, thousands of companies now utilize Retells AI voice agents to handle sales, support, and logistics calls that once required large teams of human agents. Now, were scaling fast, and were looking for bold, ambitious people to help us build the gold standard for voice automation. If you want to work on deeply technical challenges, move fast, and make an outsized impact at one of the fastest-growing Voice AI startups in the world, youll love it here.
Were a top 50 AI app in a16z list: link
Customer obsession. We start with the customer and work backwards. Every job and task matters only if it ultimately benefits the customer.
Insist on the Highest Standards: We ship products youre proud to show everyone even if it means spending more time perfecting them.
As a Senior Backend Engineer, youll shape the core systems powering millions of AI-driven conversations. Youll tackle real-time audio, global telephony, and developer tooling, working across the stack with the founding team. This high-impact role offers rapid feedback loops, customer collaboration, and the chance to define a category-leading product.
Build foundational architecture for Retell's platform, such as prompt orchestration, testing frameworks, observability dashboards, and telephony integrations.
Design scalable backend systems and DevOps workflows for reliable performance across millions of calls.
Lead complex projects from architecture to production, driving delivery and monitoring.
Collaborate with product and design teams to create intuitive APIs and interfaces for quick customer onboarding.
Support customer onboarding, troubleshoot issues, and turn feedback into product improvements.
Have 2+ years of backend development experience and a strong foundation in CS fundamentals (CS/CE/EE degree or equivalent).
Have worked on scalable, high-performance backend systems especially anything involving concurrency, data, storage, or distributed components.
Take ownership like a founder and enjoy building core systems that need to be fast, reliable, and correct.
Have startup experience or the grit to operate in a high-velocity environment bonus points if youve worked on infrastructure, databases, or large-scale backend systems.
Cash: 215k - 290k
Equity: Offer Equity
US Visas: Retell AI is open to sponsoring work authorization for qualified candidates, including H1B, TN, L1, E3, F1 (OPT/CPT), and O1 visas.
100% coverage for medical, dental, and vision insurance
~$200/month wellness reimbursement (gym, fitness classes, etc.)
~$300/month commuter reimbursement (gas, Caltrain, etc.)
~$75/month phone bill reimbursement
~$50/month internet reimbursement

1M revenue/employee, and significant equity.
~ Offers tied to interview performance, not experience or past salaries.

Online Assessment: Coding questions on practical problemsolving (7 days to complete).
Practical coding session focused on code fluency and system design (For frontend roles, we will focus on Reactspecific questions. For backend roles, we take a technologyagnostic approach.)
A deep dive into your backend chops and how you think through systems design.
Onsite/Virtual Interviews (23hrs): Hosted in our office if located in the Bay Area or virtual, with three rounds:

Practical Coding: Tackle realworld coding tasks with debugging.
Build automations or improve workflows in any basic environment setup like python, java, node.js, etc.

Fulltime
Engineering and Information Technology
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