Applied AI Engineer (Customer Facing

ABOUT RETELL AI

Retell AI is using first-principles thinking to reimagine the call center with cutting-edge voice AI. Thousands of companies now use Retell's AI voice agents to handle sales, support, and logistics calls that once required large teams of human agents. Backed by Y Combinator, Alt Capital, and other leading investors, we've scaled to $80M in ARR with a team of 50, up from $5M at the start of 2025, and are now valued at over $1.5B.

Our vision for 2026 is to build a modern CX platform where entire contact centers are powered by AI. Instead of basic automation that needs constant human tuning, we're creating intelligent AI “workers” that act as frontline agents, QA analysts, and managers, continuously executing, monitoring, and improving every customer interaction.

We're growing fast and looking for ambitious builders who want to tackle hard technical problems, move quickly, and have a real impact on one of the fastest-growing voice AI companies in the world.

Let's build the future together.

• No. 1 Best Places to Work in the Bay Area, San Francisco Business Times 2026

• Top 50 AI Apps, a16z (2025)

• #3 Fastest-Growing Software Company, G2 Best Software Awards 2026

• Best Agentic AI Software, G2 Best Software Awards 2026

• #4 Fastest-Growing Software Vendor, Brex Benchmark 2025

• Enterprise Tech 30 Class of 2026, Nasdaq & Wing VC

• Top-Ranked Startup, Lean AI Leader board

• Backed by Y Combinator

Retell AI is transforming customer experience with Voice AI for enterprises, including customers like CVS/Aetna, American Airlines, Lenovo, and Grab. We're building the infrastructure that powers millions of AI-powered phone conversations every month—and we're just getting started.

We're hiring an Applied AI Engineer to work directly with enterprise customers to design, build, and deploy production AI voice applications.

As an Applied AI Engineer, you'll sit at the intersection of AI, software engineering, and customer success. You'll partner closely with customer engineering teams to integrate Retell into their products, solve complex technical challenges, optimize AI workflows, and help customers successfully launch and scale Voice AI in production.

This is an ideal role for someone who enjoys building software, solving ambiguous technical problems, and working directly with customers. You'll collaborate daily with Engineering, Product, and Customer Success while helping shape the future of enterprise AI.

This is a full-time position based in our Redwood City headquarters.

• Design, build, and deploy production AI voice applications.

• Partner with customer engineering teams to integrate Retell APIs and SDKs.

• Develop custom workflows, automations, and conversational AI experiences.

• Help customers architect scalable AI systems for production.

• Debug production issues across APIs, webhooks, telephony, SIP, authentication, latency, and infrastructure.

• Investigate AI behavior and improve prompt quality, reliability, and performance.

• Work directly in customer codebases when needed.

• Own technical implementation from proof of concept through production launch.

• Lead technical onboarding for enterprise customers.

• Serve as the primary technical advisor during implementation.

• Guide customers on AI best practices, architecture, and deployment strategies.

• Help customers expand into new AI use cases across their organizations.

• Partner closely with Product and Engineering to improve the platform.

• Turn customer feedback into product improvements.

• Identify recurring customer pain points and propose scalable solutions.

• Help define best practices for deploying enterprise Voice AI.

• Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, or a related technical field.

• 2+ years of software engineering or customer-facing technical experience building and deploying production applications.

• Strong programming skills in Python, Type Script, or similar languages.

• Experience working with APIs, SDKs, and distributed systems.

• Excellent debugging and…