Senior Machine Learning Engineer, Telnyx
Speech Synthesis
Cloud-based digital communication platform provider
Be an early applicant
Cloud-based digital communication platform provider
201-500 employees
Be an early applicant
201-500 employees
Company mission
To make universal communications possible for businesses through its cloud-based VoIP services.
Role
Who you are
- 6+ years of experience in machine learning or speech systems engineering
- Hands-on expertise with neural TTS, speech synthesis, or adjacent areas (ASR, voice cloning, multilingual modeling)
- You’ve obsessed over one or two hard problems, whether it’s building multilingual TTS from noisy data, teaching LLMs to speak, designing self-supervised audio encoders, or making diffusion models run in real time
- Experience with LLM-based approaches to speech synthesis or prosody control
- Experience leading small teams and defining technical direction or team executables
- Production mindset: You build systems that run fast, stay stable, and are easy to maintain
What the job involves
- As a Senior ML Engineer (Speech Synthesis), you’ll be a founding member of the team building Telnyx’s next-generation speech synthesis systems
- This is a greenfield opportunity — you’ll define the stack, architecture, and best practices for training and deploying state-of-the-art multilingual text-to-speech (TTS) models that power our voice AI agents
- You’ll build everything from distributed training pipelines to inference services that generate ultra-low-latency, lifelike voices across dozens of languages
- Your work will bridge research and production — shaping how millions of people experience real-time conversational AI
- Own the stack from day one: Design and implement the ML training and inference pipelines for multilingual speech synthesis
- Low-latency TTS: Engineer systems optimized for real-time, streaming speech generation with sub-100ms response targets
- Train cutting-edge models: Build and fine-tune multilingual TTS systems using modern architectures — including LLM-based, diffusion, and flow-matching approaches
- Massive-scale data processing: Develop pipelines for ingesting, aligning, and normalizing text, audio, and phonetic data across dozens of languages
- Experimentation at scale: Run distributed training across multi-node GPU clusters, tracking results and iterating quickly
- Cross-functional collaboration: Work with infrastructure and voice platform teams to deploy models that scale globally
- Research meets production: Evaluate emerging techniques (LLM-guided synthesis, zero/few-shot voice cloning, full-duplex modeling) and bring them to life in production-grade systems
Our take
The telecommunications landscape is changing rapidly, as more companies migrate from traditional telephone communication to digital conferencing platforms and instant messaging. However, existing digital communication platforms usually come with connection issues, and combating this through bespoke solutions comes with employing expensive software engineers.
Telnyx develops cloud-based Voice over Internet Protocol (VoIP) services for enterprises in the form of APIs, providing tools for the rapid development of bespoke applications for SMS and MMS messaging, WhatsApp communication, voice calls, IoT communications and verification, and elastic SIP trunking. The company claims that it ensures high speeds, reduced latency, and flawless connections through its tier-1 interconnections with major global internet hubs.
Whilst many other startups are providing VoIP solutions, Telnyx has taken a unique approach by developing APIs that allow enterprises to design their own next-gen digital communication service. This is complemented by the company’s tier-1 interconnects, detailed API documentation, and integrated dashboard, ultimately providing an end-to-end solution for cutting-edge wireless communications.
Kirsty
Company Specialist at Welcome to the Jungle
Insights
-28% employee growth in 12 months
Company
Funding (1 round)
Sep 2014
$1m
SEED
Total funding: $1m
Company benefits
- Flexible, global team: Reaching our full potential means hiring people from all walks of life. Telnyx allows employees to work from home, and we offer in-person options for team members in Amsterdam, Chicago, Dublin and Warsaw
- Modern life, modern accommodations: Working in the business of innovation means offering support to our team to help them stay innovative. Telnyx offers unlimited personal time off to help employees recharge
- Benefits based on location: With team members across the globe, Telnyx offers competitive perks and benefits based on location. Employees in Ireland, the UK, and the US are eligible for healthcare benefits, and US employees also have access to 401(k) matching
Company HQ
River North, Chicago, IL
Leadership
David Casem
(Co-Founder & CEO)Co-founded Telnyx as CEO in 2009 and has served as the CEO since.
Ian Reither
(COO)Previously spent 3 years at Trexin Consulting as a Principal Consultant before joining Telnyx as COO in 2014.
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