JOB TITLE: Machine Learning Engineer - ASR & Speech Recognition

Company: Ethical Den

Location: Kolkata, West Bengal

Work Mode: In office only

Employment Type: Full time

Experience: 2 to 5+ years

Openings: 1

Joining: Immediate to 30 days preferred

ABOUT THE ROLE

Ethical Den is hiring a Machine Learning Engineer specialising in Automatic Speech Recognition and real-time speech processing.

You will work with our AI research team on a confidential speech-technology initiative.

The role involves speech recognition, streaming inference, endpoint detection, speech datasets and optimisation for real-world audio conditions.

Detailed project information will be shared with suitable candidates subject to confidentiality requirements.

KEY RESPONSIBILITIES

• Research and evaluate ASR architectures.

• Fine-tune speech-recognition models.

• Build streaming ASR pipelines.

• Generate and improve partial transcripts.

• Optimise recognition for noisy and real-world audio.

• Develop Voice Activity Detection systems.

• Work on endpoint detection.





• Improve end-of-turn detection.

• Handle hesitation, silence and interrupted speech.

• Improve recognition of names, dates, numbers and domain-specific terminology.

• Work on multilingual and code-mixed speech recognition.

• Measure WER and CER.

• Develop business-critical error metrics.

• Measure time to first partial transcript.

• Measure transcript-finalisation latency.

• Build ASR regression datasets.

• Work closely with speech-data specialists.

• Work with infrastructure engineers on production inference.

• Optimise GPU utilisation and inference speed.

REQUIRED SKILLS

• Python

• PyTorch

• Automatic Speech Recognition

• Digital audio fundamentals

• Speech-model training/fine-tuning

• Streaming inference

• Audio preprocessing

• Voice Activity Detection

• GPU inference

• Linux

• Git

RELEVANT TECHNOLOGIES MAY INCLUDE

• Whisper

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📌 Machine Learning Engineer Kolkata Metropolitan Area
🏢 Ethical Den
📍 Kolkata Metropolitan Area