Full-Time
Applied AI Engineer
Customer Facing
Updated on 9/11/2026
Retell AI
51-200 employees
Build, test, deploy AI voice agents
Compensation Overview
$180k - $300k/yr
H1B Sponsorship Available
Redwood City, CA, USA
Hybrid
Based in the Redwood City headquarters; relocation is provided. Travel up to 10% may be required for customer engagements.
Bachelor's
 Software Engineering (1) |
|---|
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- A bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, or a related technical field.
- At least 2 years of software engineering or customer-facing technical experience building and deploying production applications.
- Strong programming skills in Python, TypeScript, or similar languages.
- Experience working with application programming interfaces, software development kits, and distributed systems.
- Strong debugging and problem-solving abilities.
- Strong communication skills and the ability to work directly with technical customers.
- Availability to work standard U.S. business hours with overlap with the Pacific Time team and enterprise customers.
- Design, build, and deploy production artificial intelligence voice applications.
- Partner with customer engineering teams to integrate Retell application programming interfaces and software development kits.
- Develop custom workflows, automations, and conversational artificial intelligence experiences.
- Help customers architect scalable artificial intelligence systems for production.
- Debug production issues across application programming interfaces, webhooks, telephony, Session Initiation Protocol, authentication, latency, and infrastructure.
- Investigate artificial intelligence 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 artificial intelligence best practices, architecture, and deployment strategies.
- Help customers expand into new artificial intelligence use cases across their organizations.
- Partner 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.
- Experience building artificial intelligence or large-language-model-powered applications.
- Experience with Voice AI, speech technologies, or conversational AI.
- Experience with cloud infrastructure such as AWS, GCP, or Azure.
- Experience with telephony, Session Initiation Protocol, Twilio, or real-time communications.
- Startup experience.
- Customer-facing engineering, solutions engineering, or consulting experience.
- Willingness to travel up to 10% for customer workshops, launches, and onsite engagements.
Retell AI provides a platform for developers to build, test, deploy, and monitor AI-powered voice agents. It offers a voice AI API and an agent builder that lets users create custom voice agents to automate and optimize communication processes, designed to handle complex workflows and scale to production-ready levels. The platform works by giving developers an API plus a visual/programmable builder to design agents, integrate them into systems, and manage deployment and monitoring for production use. Its differentiators include an end-to-end lifecycle toolkit for AI voice agents, support for complex call workflows at scale, and ecosystem partnerships (e.g., Data Leaders, Cal.com) that expand integrations. Retell AI’s goal is to help businesses improve their call operations and customer interactions by adding reliable AI-driven voice capabilities through a scalable developer platform.
Company Size
51-200
Company Stage
Seed
Total Funding
$4.7M
Headquarters
Palo Alto, California
Founded
2023
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Simplify's Take
What believers are saying
- Conductor launched June 29, 2026, and now drives 70% of simulation tests.
- Retell reached $50 million ARR in 2025 and 55 million monthly calls.
- New GPT-5.6 support and lower pricing improve conversion, retention, and usage growth.
What critics are saying
- OpenAI GPT-5.6 and Realtime 2.1 compress Retell's voice-layer differentiation by 2026.
- Telephony outages or bad agent behavior create direct customer churn and liability.
- Enterprise buyers can move from Retell to in-house stacks once workflows stabilize.
What makes Retell AI unique
- Conductor gives graph-native review, testing, and approvals inside Retell's builder.
- Retell handles 55 million monthly calls with sub-600ms latency and 50-plus languages.
- Retell ships telephony, prompts, tools, analytics, and managed workflows in one platform.
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Benefits
Health Insurance
Wellness Program
Phone/Internet Stipend
Remote Work Options
Hybrid Work Options
Growth & Insights and Company News
6 month growth
↓ -2%1 year growth
↓ -5%2 year growth
↓ -6%Retell AI, a voice AI platform, has launched Conductor, the first graph-native review system for production voice agents. The AI copilot helps enterprises identify failures, automate testing and continuously improve voice agents for contact centers. Conductor operates within agent workflows, displaying proposed changes directly in the interface and requiring human approval before implementation. Users interact with the system in plain English, enabling teams to shape voice agents without coding. The platform already generates 70% of Retell's simulation tests and executes half of all agent edits. The system features a graph-native review interface, operational intelligence for analysing failed calls, and embedded best practices from thousands of enterprise deployments. Retell AI processes over 30 live calls per second and handles 55 million AI phone calls monthly. Conductor is now available to all Retell customers.
Retell AI, a voice AI platform based in Redwood City, California, has been ranked number one on the San Francisco Business Times' 2026 Best Places to Work in the Bay Area list in the 10-24 employees category, scoring 99.04. The recognition comes as the company has grown annual recurring revenue from $10 million to $60 million over the past year whilst maintaining a lean team. Retell AI's workplace culture emphasises autonomy and outcomes over hours worked, with employees able to work remotely for up to two weeks annually. The company's no-code platform enables enterprises to deploy AI voice agents rapidly. It currently processes over 55 million AI phone calls monthly for clients including the San Antonio Spurs, Motorola and Lenovo, handling more than 30 concurrent calls per second at peak volume.
Retell AI, an AI voice agent platform, has been named to Wing VC's Enterprise Tech 30 2026 list, recognised as one of 10 early-stage companies. The list, compiled with Newcomer, highlights voice AI as a key trend for 2026. Launched in 2024, Retell AI reached $50 million ARR in 2025 and now powers over 50 million AI phone calls monthly. The platform enables corporate call centres to deploy AI voice agents for sales and support across multiple channels, offering human-standard voice quality, sub-600ms latency, and support for over 50 languages. The company's technology allows businesses to build and deploy voice AI agents within days rather than the industry standard of a year or more. Retell AI is HIPAA, SOC2 and GDPR compliant.
Evie Wang, co-founder and chief marketing officer of Retell AI, has been named to Inc.'s 2026 Female Founders 500 list. The annual honour recognises the most dynamic women business leaders in the United States, with this year's honourees collectively generating approximately $12.3 billion in 2025 revenue. Wang led Retell AI's marketing and product strategy during a period of hypergrowth, scaling annual recurring revenue from $8 million to $36 million in eight months across a 21-person team. The AI voice agent platform now handles over 40 million real-time calls monthly for Fortune 500 clients and has achieved over 300% quarter-over-quarter user growth. Under Wang's leadership, Retell AI has been recognised as an a16z Top 50 AI company.
Retell AI secures 4.6M seed funding to revolutionize AI voice calling! Read about our journey to build the future of AI voice agent powered call operations.