AI Researcher / ML Engineer (ASR & Speech Specialist)

Key Responsibilities

• Model Development & Innovation: Architect, train, fine-tune, and evaluate state-of-the-art speech representations and ASR models (e.g., End-to-End Conformer, Whisper, RNN-T, and hybrid CTC/Attention architectures) across multiple global languages.
• Customization & Domain Adaptation: Design and deploy highly scalable algorithms for dynamic vocabulary insertion, contextual biasing, and language model (LM) personalization to precisely capture customer-specific terminology, acronyms, and product names.
• Evaluation: Implement automated framework evaluations to benchmark model performance, rigorously tracking Word Error Rate (WER), Character Error Rate (CER), embedding-based metrics, latency budgets (RTF), and computing efficiency profiles under varying acoustic environments.
• Agentic Benchmarking: Develop pioneering multilingual benchmarks for end-to-end conversational AI agents, including speech-to-text and text-to-speech components, and targeting the weaknesses of state-of-the-art frontier models.
• Real-Time & Batch Speech Systems: Partner with core engineering teams to build, optimize, and maintain high-throughput pipelines optimized for both ultra-low latency real-time streaming inference and high-efficiency asynchronous (batch) multi-channel speech analysis.
• Speech Pipeline Engineering: Develop and refine standard auxiliary components of the speech processing chain, including Voice Activity Detection (VAD), speaker diarization, punctuation restoration, noise/acoustic normalization, and audio pre-processing filters.
• Cross-Functional Productization: Translate product requirements into technical AI roadmaps, working hand-in-hand with Product Managers to ship speech-to-text, simultaneous translation, and semantic speech analytics features.

Required Technical Qualifications

• Education: Master’s or Ph.D. degree in Computer Science, Electrical Engineering, Computational Linguistics, Data Science, or a related quantitative field with an emphasis on speech processing or deep learning (or equivalent proven industry track record).
• Speech Domain Expertise: Minimum of 3–5 years of dedicated professional experience developing ASR systems, speech-to-text translation pipelines, or advanced audio processing models.
• Deep Learning Frameworks: Advanced proficiency with PyTorch or equivalent frameworks, along with extensive experience utilizing dedicated speech toolkits such as Whisper, NVIDIA NeMo, Hugging Face Transformers, Kaldi, ESPnet, or SpeechBrain.
• On-device runtimes: Hands-on experience converting and running PyTorch models on at least one mobile inference runtime: ExecuTorch, LiteRT (formerly TensorFlow Lite), or ONNX Runtime Mobile. You have personally taken a non-trivial model through conversion, including resolving unsupported operations and dynamic-shape or decoder-loop issues.
• Software & Infrastructure: Strong software engineering principles in Python, with a clear understanding of data structures, algorithm optimization, and handling complex multilingual text/audio tokenization schemas.
• Data Pipeline Mastery: Proven experience working with large-scale audio datasets, audio augmentation techniques (e.g., SpecAugment, noise injection), and text normalization/inverse text normalization (ITN) pipelines.

Preferred & Specialization Qualifications

• High-Performance and on-device Inference: Experience optimizing models for constrained on-device and production environments using quantization (INT4/INT8/FP16), distillation, ONNX Runtime, TensorRT, or Triton Inference Server.
• Research Footprint: Peer-reviewed publications in premier speech and machine learning conferences (e.g., ICASSP, INTERSPEECH, NeurIPS, ICLR, ACL) are a strong plus, or an active contribution footprint to open-source speech communities.
• Hardware acceleration: Working knowledge of mobile NPU/DSP acceleration on the Android SoC landscape (Qualcomm QNN / Hexagon, GPU, and NNAPI delegates) and the trade-offs across Snapdragon, MediaTek, and Google Tensor.
• Streaming Architectures: Deep technical familiarity with streaming neural architectures (e.g., block-processing, streaming transformers, or transducer models) and real-time network transport constraints (WebSockets, gRPC).
• Multilingual Engineering: Professional exposure to building zero-shot multilingual speech systems or managing cross-lingual acoustic phonology data.

Core Competencies & Soft Skills

• Analytical Problem Solving: Ability to break down ambiguous business or product requirements into deterministic, actionable machine learning experimentation frameworks.
• Collaborative Communication: Strong capability to communicate intricate technical machine learning complexities to non-technical stakeholders across product, design, and executive leadership.
• Ownership Mindset: Comfortable working in a fast-paced environment, taking accountability from initial algorithmic hypothesis and exploratory research through to final production monitoring.

About LILT AI

LILT is revolutionizing how the world communicates. We use cutting-edge AI, machine translation, and human-in-the-loop expertise to make information accessible to everyone, regardless of the language they speak. We are backed by Sequoia, Intel Capital, and Redpoint, and trusted by Intel Corporation, Canva, the United States Department of Defense, the United States Air Force, ASICS, and hundreds of global enterprises.

Our Story

LILT was founded in 2015 by Spence and John, who met at Google working on Google Translate. They recognized the need for higher-quality enterprise translations and set out to build something better. Today, LILT is a machine learning company focused on Large Language Models, human-in-the-loop systems, and now agentic AI. We are committed to fairness, inclusion, and transparency in our hiring process.

Our Tech

We offer brand-aware AI that learns your voice, tone, and terminology to ensure every translation is accurate and consistent. Our agentic AI workflows automate the entire translation process from content ingestion to quality review to publishing. We have 100+ native integrations with systems like Adobe Experience Manager, Webflow, Salesforce, GitHub, and Google Drive to simplify content translation. Our Human-in-the-loop reviews are conducted by a global network of professional linguists for high-impact content requiring expert review.

At LILT

We are committed to a fair, inclusive, and transparent hiring process. We extend equal opportunity to all individuals without regard to race, religion, sex, sexual orientation, gender identity, age, physical or mental disability, medical condition, genetic characteristics, veteran or marital status, pregnancy, or any other classification protected by applicable local, state or federal laws. We are an equal opportunity employer.

Contact Us

If you have any concerns, require accommodations, or would like to opt-out of the use of AI in our hiring process, please let us know at recruiting@lilt.com. For more information about LILT, visit our website at www.lilt.com.