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Founding Senior Software Engineer (Backend)
Retell AI
Redwood City, USA
Full-time
Senior · 2+ years experience
Hybrid
USD 215000-290000 yearly / year
Discovered 1 weeks ago
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Role Overview
As a Founding Senior Backend Engineer, you’ll shape the core systems powering millions of AI-driven conversations. You’ll 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.
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Full Job Posting
ABOUT RETELL AI
Retell AI is using the first principles to reimagine the call center with cutting edge voice AI.
We believe voice is still the most natural way humans communicate, yet it has been trapped in outdated call centers for decades. 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 Retell’s AI voice agents to handle sales, support, and logistics calls that once required large teams of human agents. Backed by Y Combinator, Altman Capital, and other leading investors, we have scaled to $30M ARR with a team of 20 people, up from $5M at the start of 2025.
Now, we’re scaling fast, and we’re 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, you’ll love it here.
Let’s build the future of voice automation together.
We’re a top 50 AI app in a16z list: https://tinyurl.com/5853dt2x
We're also one of the top ranking startups on: https:// leanaileaderboard.com/
ABOUT THE ROLE
As a Founding Senior Backend Engineer, you’ll shape the core systems powering millions of AI-driven conversations. You’ll 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.
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