Apollo Defend
Building the voice security layer for the AI era.
Voice is the new interface for AI. It requires a new security platform.
Protect your organization.
Defending Against the Next Generation of Voice Threats
Real-Time Voice Privacy Engine
Your voice is as unique as your fingerprint.
Protect your identity in real-time across any communication platform.
AI Audio Firewall
Stop adversarial voice prompts before they're heard.
Detect and defuse attacks with real-time threat modeling and analysis.
Verify the Voice. Block the Fake.
Detect AI-generated voices before they're weaponized.
Authenticate speaker identity to block impersonation and fraud.
We're building foundational technologies at the intersection of voice, privacy, and security. From protecting individual identities to safeguarding communication systems, our work addresses some of the most urgent challenges emerging with the rise of generative audio.
— Yishay Carmiel, CEO
Proven. Secure. Scalable.
Our platform safeguards millions of mission-critical voice interactions every month. Trusted by enterprises and government agencies, it's engineered for unmatched performance, security, and scalability.
Enterprise & Government
Battle-tested by major enterprises and federal agencies. Fully compliant with HIPAA and PCI, and built for high-stakes deployments.
Plug-and-Play
Deploys instantly via web, desktop, API/SDK, or iFrame. Seamlessly integrates with any communication platform or alerting system.
Rapidly Evolving
We continuously integrate the latest advancements in voice AI and threat detection to stay ahead of attackers.
Cloud & On-Premise
Get consistent performance and data control with flexible deployment—whether you're in the cloud or operating in secure on-prem environments.
Scalable Architecture
Designed for production-grade speech enhancement. Serving real users with over 4 million minutes processed monthly—and growing.
Academic Collaboration
Backed by rigorous research and collaborations with JHU, USC, and others. We bring innovation from academia into operational use through IARPA and related programs.
Every new AI model brings new challenges and vulnerabilities. We move fast to keep pace while making sure our systems stay simple and reliable.
— Lukasz Wojciak, CTO
Join Us & Shape the Future
Help us build a safer world through voice security AI. At Apollo Defend, curiosity and collaboration fuel innovation with real-world impact. Be part of a team shaping the future of trustworthy communication.
Yishay Carmiel
Chief Executive Officer
Former founder of IntelligentWire and S-Infinity, with two successful AI startup exits. Over 15 years of experience in ASR and conversational AI. Named Speech Luminary of the Year by SpeechTek.
Najim Dehak
Scientific Lead
Expert in ASR and co-developer of the influential I-vector technique. Leads research in speech and machine learning as a professor at Johns Hopkins University and former MIT CSAIL researcher.
Łukasz Wójciak
VP Engineering
Over 21 years of experience in software development, including more than a decade in real-time audio processing. He has led multiple teams and projects at companies like Avaya and Spoken, with a strong focus on telco and low-latency systems.
Roy Zanbel
VP Product & Operations
Product leader with a track record of bringing cutting-edge technologies to market at top tech companies like Elastic and JFrog.
Jan Vainer
Research Lead
Expert in audio and speech technologies, combining cutting-edge research with practical development. He has many years of experience in TTS, ASR, voice cloning, and voice privacy.
Vojtěch Srdečný
MLOps Engineer
Jack of all trades who specializes in doing the dirty research and infrastructure jobs nobody else wants to bother with.
Tomáš Nekvinda
ML Engineer
Curious bug-squasher with hands-on experience in speech-to-speech, TTS, ASR, and dialogue systems. Usually building something streamable or fixing datasets.
Open Positions
MLOps Engineer
(Speech-Focused)
Full-time
Remote (EU time zone)
As an MLOps Engineer (Speech-Focused), you’ll play a key role in scaling our model deployment and data workflows.
UI/UX Designer & Frontend Developer
Full-time
Remote (EU time zone)
As a UI/UX Designer & Frontend Developer, you’ll take the lead on everything visual — building slick user interfaces in React, designing beautiful websites, and crafting the graphic materials that bring our ideas to life.
No perfect match?
Don’t worry — we’d still love to hear from you! If none of the listed roles feel like the right fit, reach out anyway. We’re always open to exploring new forms of collaboration and finding ways to work with great people.
Speak Freely — The Defense Blog
Stay ahead of emerging threats, voice security trends, and defense innovation. Our team shares real-world insights and strategic thinking from the front lines of AI security.
Adversarial Threats in Speech AI
Yishay Carmiel|July 3, 2025
6-minute read
As voice becomes a primary interface for interacting with machines, adversarial threats against speech AI systems are growing rapidly and quietly. From spoofing speaker identity to injecting imperceptible noise that breaks transcription, the attack surface is broad and evolving. In this post, we’ll outline the core types of speech models, how
New Threat Vector: Prompt Injection at the Raw Signal Level
Ben Lorica|June 24, 2025
External blogpost
Voice interfaces have become a routine feature of modern life, from home assistants to automotive controls and automated customer service. Yet, within the AI community, the focus on large language and visual models has overshadowed the field of voice. In my experience, for every AI team experimenting with voice or audio models, there are dozens
The New (AI) Battlefield
Roy Zanbel|June 17, 2025
5-minute read
At the height of the war in Ukraine, frontline brigades were field-testing home-built drones that cost as little as $350, upgrading the designs every few weeks to out-maneuver Russian counter-measures. In June 2025, these drones were used in a Ukrainian drone strike that severely damaged a key Russian airbase, knocking out 10%, according to a
Beyond ChatGPT: The Other AI Risk You Haven't Considered
Ben Lorica|May 15, 2025
External blogpost
Voice technology has raced ahead in the past year, bringing unprecedented convenience. But this rapid progress also unveils a new frontier of risk, as once-narrow synthesis models yield to systems that put voice at the center of human-machine interaction. Advances such as Sesame’s CSM architecture, F5-TTS’s ultra‑fast cloning and emerging
Anatomy of Deepfake Voice Attacks
Roy Zanbel|April 28, 2025
8-minute read
AI-generated voices have crossed a critical threshold. What once sounded robotic and gimmicky now passes as human, with emotion, nuance, and intent. The rapid evolution of AI voice synthesis has opened the door to remarkable innovation. But it has also created a new class of security vulnerabilities. In this post, we explore how advances in voice
Rapid Evolution of AI Voices
Roy Zanbel|April 24, 2025
5-minute read
Not long ago, synthetic voices were easy to detect — flat, robotic, and unnatural. Today, AI-generated speech is nearly indistinguishable from human voices, capturing nuances like tone, emotion, and speaking style with remarkable precision. This leap in realism is driven by advances in deep learning and generative models that solve three major