---
title: 'Principal Research & Engineering, Realtime Voice AI at Inflection AI'
canonical: 'https://feeny.ai/job/principal-research-engineering-realtime-voice-ai-inflection-ai-palo-alto-vbx7kq9h24x7'
type: 'job'
last_seen: '2026-09-15'
---

# Principal Research & Engineering, Realtime Voice AI at Inflection AI

- **Company:** Inflection AI
- **Location:** Palo Alto California, United States
- **Posted:** 2026-06-29
- **Last confirmed live:** 2026-09-15
- **Apply:** https://boards.greenhouse.io/inflectionai/jobs/4693024006?gh_jid=4693024006

## Job description

## About Inflection AI

Inflection AI is a Public Benefit Corporation empowering people with human-centered, emotionally intelligent AI. We’re shaping the future of AI by combining emotional intelligence (EQ) and raw intelligence (IQ) to elevate people’s potential.

Inflection AI created Pi, the world’s first emotionally intelligent AI, to help people work through decisions, emotions, and challenges. Pi is a personal AI agent powered by Inflection AI’s foundation model, proving that AI can be personal, empathetic, and contextually aware.

## About the Role

Voice is becoming the highest-stakes interface for AI, where quality depends on speed, naturalness, interruption handling, emotional nuance, and reliability in real-world conditions. We are looking for a hands-on technical leader to define and build Inflection’s realtime Voice AI stack across speech models, streaming systems, voice-agent runtime, and evaluation. This person will help shape how emotionally intelligent AI shows up in spoken interactions, partnering across research, engineering, product, and design to deliver voice agents that feel responsive, trustworthy, and useful in enterprise settings.

## What You’ll Do

- Establish the technical roadmap for Inflection's realtime Voice AI stack, encompassing streaming ASR, TTS, speech-to-speech, speech LLMs, turn-taking, barge-in, latency, and reliability.
- Utilize a 1,000 GPU cluster to support performance benchmarking and extensive experimentation.
- Determine build-vs-buy-vs-train strategies for core audio, speech, and realtime interaction components.
- Direct research and engineering efforts focused on speech quality, naturalness, expressiveness, emotional fit, controllability, and production readiness.
- Collaborate with infrastructure, product, design, and agentic AI teams to deploy voice agents for enterprise workflows.
- Develop evaluation systems measuring voice quality through metrics such as clarity, emotional appropriateness, interruption handling, task success, user preference, latency, and reliability, moving beyond standard WER.
- Refine production voice behavior by debugging across runtime, model, evaluation, data, and product layers.
- Mentor, and Coach a team specializing in speech research, audio infrastructure, realtime systems, and evaluation.

## What We’re Looking For

- Experience leading or serving as a principal Research and Engineering contributor to realtime voice, speech, audio AI, or conversational AI systems in production.
- Experience with one or more of: streaming ASR, TTS, speech-to-speech systems, speech LLMs, audio tokenization, multimodal models, barge-in, low-latency inference, or realtime agents.
- Strong technical judgment across both speech modeling and production systems.
- Ability to define voice quality in terms of user and customer outcomes, not only offline model metrics.
- Experience designing or using evaluation systems that capture real user experience.
- Strong product intuition for natural, trustworthy, emotionally appropriate voice interactions.
- Ability to lead senior technical talent while staying close to the code, architecture, and debugging work.
- Have a bachelor’s degree or equivalent in a related field to the offered position requirements

Employee Pay Disclosures

At Inflection AI, we aim to attract and retain the best employees and compensate them in a way that appropriately and fairly values their individual contributions to the company. For this role, Inflection AI estimates a starting annual base salary to fall within the range of $400,000 to $550,000, depending on a candidate’s qualifications and level of experience. This role also includes a meaningful equity component, allowing employees to share in the long-term success of the company.

## Benefits

Inflection AI values and supports our team’s mental, emotional, financial and physical health. We are focused on building a positive, safe, inclusive and inspiring place to work. Our benefits include:

- Robust medical, dental and vision options with employer contributions for HSA, FSA and DFSA
- 401k matching program
- Flexible Time Off, 10 paid holidays, 5 days sick leave
- Parental, Medical and Family care leave
- Generous cell-phone, wellness and office set up stipends
- Support of country-specific visa needs for international employees living in the Bay Area

## About Inflection AI

## Company Overview
- **One-liner**: Inflection AI is an AI studio creating human-centered, emotionally intelligent AI models and agents for individuals and enterprises.
- **Entity Type**: Private (Venture-backed; two funding rounds totaling $1.525B)
- **Headquarters**: Palo Alto, California, United States
- **Founded**: 2022
- **Founders**: Reid Hoffman, Mustafa Suleyman, Karén Simonyan

## Core Business
- **Primary industry**: Artificial Intelligence / Machine Learning
- **Target customers**: B2C (Pi chatbot for individuals), B2B (enterprise API and on-premises solutions)
- **Mission**: “Harness the power of AI to improve human well-being and productivity” – structured as a public benefit corporation.

## Products & Services
- **Pi (Personal AI Assistant)**: A voice-enabled chatbot available on iOS, Android, and web, designed to provide high conversational and emotional intelligence. Free for individual users.
- **Inflection API**: Enables enterprises to integrate Inflection’s conversational AI models into their own applications, with fine-tuning and customization options.
- **On-Premises / Private Cloud Solutions**: Deployments for regulated industries (e.g., wealth management) where data must never leave the customer’s network.
- **BoostKPI (acquired)**: A data analysis platform that helps organizations query and make sense of their data using natural language.
- **Jelled.ai (acquired)**: An organizational data tool that connects to email, accounting, and other business systems to provide Socratic dialogue and insights.

## Market Standing
- **Valuation/Market Cap**: Not publicly disclosed
- **Key Metric**: Total funding $1.525 billion (latest round: $1.3B led by Microsoft and Bill Gates, June 2023). Annual revenue estimated at $2.0M (LinkedIn data).
- **Notable Investors/Partners**: Microsoft, Bill Gates, UiPath (partnership), Greylock Partners (talent source)
- **Growth Signals**: 62 employees (+28.8% YoY); “hundreds” of API customers; acquisitions of BoostKPI and Jelled.ai; active research into agentic AI.

## Competitive Advantages
- **Emotional Intelligence (EQ) + IQ**: Models are built on a unique, proprietary dataset collected over two years, giving them industry-leading conversational intelligence.
- **On-Premises / Private Cloud**: Ability to run entirely within a customer’s own infrastructure – critical for regulated industries.
- **Public Benefit Corporation Structure**: Legally committed to societal well-being, which builds trust with customers and partners.
- **Small, Agile Team**: Despite raising over $1.5B, the company remains lean (~62 people), allowing rapid iteration and deep collaboration.

## Strategic Focus
- **Enterprise Pivot**: After Microsoft licensed Inflection’s models and hired co-founders Mustafa Suleyman and Karén Simonyan, CEO Sean White refocused the company on practical enterprise use cases rather than the AGI race.
- **Agentic AI**: Research and development into autonomous agents that act on behalf of users, with a focus on trust and alignment.
- **Data Analysis & Productivity**: Acquisitions of BoostKPI and Jelled.ai accelerate the ability to deliver insights from organizational data.
- **Partnerships**: Collaborations like UiPath to embed conversational intelligence into automation workflows.

## Why Work Here
- **Mission-Driven**: As a public benefit corporation, employees work on AI that aims to improve human well-being – a differentiator from many AI labs.
- **Cutting-Edge Technology**: Opportunity to work on frontier models (mixture-of-experts, state-of-the-art conversational AI) without the scale of a giant tech company.
- **Small Team, High Impact**: With only 62 people, every role has significant ownership and visibility. Engineering makes up 33% of the workforce.
- **Culture of Trust**: Leadership emphasizes transparency and trust, reinforced by the public benefit structure.
- **Compensation & Perks**: Not publicly detailed, but LinkedIn reviews rate the company 5.0/5.0 (2 reviews). Alumni often move to Microsoft AI, Google, and other top AI organizations.
- **Work Policy**: Headquarters in Palo Alto; likely hybrid/office-based (not explicitly stated). Active job postings (2 as of search) include Research Engineer, Voice and Senior Backend Engineer.

## Sources
1. [inflection.ai](https://inflection.ai/)
2. [linkedin.com](https://www.linkedin.com/company/inflectionai)
3. [techbrew.com](https://www.techbrew.com/stories/2025/03/28/inflection-ceo-sean-white)
4. [greenhouse.io](https://job-boards.greenhouse.io/inflectionai)

## Other roles at Inflection AI

- [Director of Product Marketing](https://feeny.ai/job/director-of-product-marketing-inflection-ai-palo-alto-california-6jq8v94frad0) — Palo Alto California, United States
- [Program Lead, Safety, Wellbeing and Regulatory](https://feeny.ai/job/program-lead-safety-wellbeing-and-regulatory-inflection-ai-dublin-2dhk0t1rb0t0) — Dublin, Ireland
- [Principal Research Engineer, Model Training & Post-Training](https://feeny.ai/job/principal-research-engineer-model-training-post-training-inflection-ai-palo-76x0eww37ac8) — Palo Alto California, United States
- [Principal Engineer, Agentic AI Systems](https://feeny.ai/job/principal-engineer-agentic-ai-systems-inflection-ai-palo-alto-california-wg93yg42rzxf) — Palo Alto California, United States
- [Staff Engineer, Agentic](https://feeny.ai/job/staff-engineer-agentic-inflection-ai-palo-alto-california-smkham3tkvvx) — Palo Alto California, United States