The Impact You'll Drive

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.

What You’ll Work On

• 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.

What You’ll Work With

• Infrastructure: Docker, Kubernetes, Ray, Kubeflow, MLflow, Weights & Biases
• Data Systems: Kafka, Redis, PostgreSQL, Parquet
• You’ll define it: You’ll help select and implement the stack that supports distributed training, data processing, and inference for global deployment.

What We’re Looking For

• 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
• Strong proficiency in Python and PyTorch
• Ability to deploy models efficiently (ONNX, TensorRT)
• 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

Why Telnyx

You’ll be joining a company where voice, infrastructure, and AI converge. Telnyx is building the foundation for real-time, intelligent global communications — and your work on multilingual TTS will be at the core of that vision.



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The Job in short

Where Innovation Meets Excellence! We're transforming the banking industry with cutting-edge technology and unparalleled customer experiences. Be part of a dynamic team that's redefining the future of digital banking. Together, we'll create groundbreaking solutions and achieve incredible success. Your journey to making a real impact starts here!"
Backbase created the Backbase Engagement Banking Platform – a unified platform with the customer at the center, helping banks orchestrate seamless journeys across every stage of the customer lifecycle.
                        
From customer onboarding, to customer servicing, customer loyalty and loan origination, we help financial institutions surpass customers’ expectations in every phase of the customer lifecycle.
                        
Built from the ground up with the customer at the heart, our Engagement Banking Platform easily plugs into existing core banking systems and comes pre-integrated with the latest fintechs so financial institutions can innovate at scale.
                        
Industry analysts Forrester, Gartner, Celent, Omdia and IDC continuously recognize Backbase’s category leadership position.

Meet the job

Do you thrive in high-pressure environments and crave a role that pushes the boundaries of technology in Banking? Are you an AI whiz who can adapt and solve problems on the fly? If so, then we want YOU!

We are forming an elite initial team of Navy Seal AI Engineers to spearhead the integration of cutting-edge artificial intelligence into our Banking solutions. This pioneering role demands exceptional technical skills coupled with the unwavering mental and physical fortitude of a Navy Seal.

Responsibilities:
Design, develop, and deploy AI solutions for real-world banking challenges
● Stay abreast of the latest advancements in AI, particularly Large Language Models (LLMs) like LaMDA, Jurassic-1 Jumbo, and emerging technologies like LangChain and HuggingFace transformers;
● Effectively utilize various LLM platforms like HuggingFace, ollama to tailor AI solutions to specific mission needs;
● Collaborate with other members and customers  to understand operational requirements and translate them into actionable AI applications;
● Troubleshoot and maintain deployed AI systems (LLMOps, MLOps, etc), ensuring optimal performance in austere environments;
● Document and share knowledge effectively to train future AI engineers within the team;
● Maintain the highest level of physical fitness and mental preparedness to seamlessly integrate with the SEAL team during operations.

How about You?

● Proficiency in programming languages like Python, Java, or C++;
● In-depth understanding of machine learning algorithms and deep learning architectures;
● Experience with cloud computing platforms (e.g., AWS, Azure);
● Exceptional problem-solving skills and the ability to think critically under pressure;
● Excellent communication and collaboration skills to work effectively within a team.

• Full SDLC Ownership: Lead the entire lifecycle of digital banking products—from initial idea and architectural design to release and maintenance.
• Architectural Excellence: Improve system architecture and design components that integrate smoothly across APIs and microservices.
• Technical Leadership: Act as a go-to resource for your team, mentoring junior engineers, conducting critical code reviews, and raising the bar for engineering standards.
• AI & Innovation: Contribute to the evolution of LLM-based voice assistants and real-time personalization engines using OpenAI and ML models.
• Security-First Mindset: Implement "Entitlements" and fraud prevention services with a focus on non-functional requirements like security, scalability, and resilience.
• Collaborative Culture: Work in a Pod based model, collaborating with Architects, Product Owners, and UX Designers to align technical solutions with business needs.

• Location: You live in Kraków or nearby area and you are willing to work in a hybrid mode - twice per week from our office. 
• Experience: You have 5–7+ years of professional experience building complex, high-traffic products.
• Backend Mastery: Solid understanding of Java, Spring JPA/Hibernate, and Maven. Experience with Microservices (Netflix OSS is a plus) and Cloud technologies.
• Frontend Expertise: Strong skills in Angular and TypeScript. You are proficient with RxJS and modern build systems (Webpack, Jenkins). Experience with Vue.js is a plus.
• System Design: You have a solid grasp of Enterprise Integration Patterns and can design systems that handle complex data flows between services.
• The "Senior" Edge: You don't just solve tickets; you identify gaps in tooling, reduce technical debt, and optimize CI/CD pipelines to streamline delivery.
• Communication: Excellent English (spoken and written). You can confidently explain technical concepts to non-technical stakeholders and get buy-in for your architectural decisions.
• Domain Knowledge: Previous experience in Fintech or Banking is highly considered an advantage.

• Growth: €1,000 annual self-development budget, a clear promotion path, and dedicated time for training.
• Rewards: Competitive base salary plus an annual bonus and referral bonuses.
• Hybrid Work: A flexible arrangement combining remote work with our vibrant Kraków office.
• Office Perks: Daily lunches, community breakfasts on Wednesdays, and high-end hardware (MacBook).
• Well-being: Private healthcare (Luxmed), Headspace app subscription, and a Work-From-Home allowance.
• Culture: Integration events, flexible working hours, and a focus on healthy work-life balance.