Senior Data Scientist – Speech AI

Are you a seasoned Data Scientist with deep expertise in Text-to-Speech (TTS) and Speech-to-Text (STT) technologies? Ready to shape the future of voice AI and build systems that power global real-time communication? WorkForce International is proud to partner with one of the most exciting startups in the conversational AI space to find a passionate and talented Senior Data Scientist – Speech AI to join their growing AI core team.

Our client is a rising global startup transforming human–AI interaction. As the creators of Kalimera.ai — the world’s leading virtual voice assistant for call centers and real-time communication — they are redefining how businesses engage with customers. With offices in Cyprus, Greece, and India, they’re scaling rapidly and using cutting-edge innovations in TTS, STT, and large language models to lead the next wave of voice automation.

Key Responsibilities:

Design, train, and optimize TTS models (e.g., Tacotron, FastSpeech, WaveNet) to deliver high-quality, multilingual voice synthesis.
Enhance STT pipelines with a focus on real-time accuracy, speaker diarization, and robust transcription for diverse accents and environments.
Collaborate closely with engineering and product teams to deploy models at scale in high-availability environments.
Lead research and benchmarking of voice models for performance, naturalness, and use-case fit (call centers, voice assistants, etc.).
Optionally integrate LLMs to boost STT performance with capabilities like sentiment analysis, summarization, and intent detection.
Influence architecture decisions and mentor peers as the team expands.

Your Profile:

5+ years of hands-on experience in AI/ML with a strong focus on TTS and/or STT systems.
Proficient in Python and deep learning libraries such as PyTorch, TensorFlow, torchaudio, librosa, etc.
Practical experience with speech frameworks like ESPnet, NVIDIA NeMo, Coqui TTS, or similar.
Solid knowledge of speech signal processing, neural vocoders, and real-time system optimization.
Experience with deploying models in cloud-native or Kubernetes-based environments.
Strong collaboration, communication, and documentation skills.
Bonus: Experience working with LLMs or NLP tools in speech-related applications.

Why this role stands out:

Shape the voice of tomorrow

Be part of a mission-driven team that’s already powering real-world enterprise deployments through Kalimera.ai.

Innovate at the edge of AI

Work with a cutting-edge stack that combines speech and language models in real-time environments.

Grow your impact

Take ownership in a high-visibility role, with a chance to lead and mentor as the AI team scales.

Work globally, collaborate deeply

Join a distributed, multicultural team spanning Europe and Asia with ambitious plans for global expansion.

This role is exclusively managed by WorkForce International, a premier global talent partner. We specialize in connecting top-tier professionals with innovative tech companies shaping the future. Ready to make your mark? Apply now and let’s talk about your next big move.

Apply now