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Engineering

Building Multi-Language Support for 500 Million Users

The engineering challenges of supporting 12 Indian languages and how we solved them with innovative NLP techniques.

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Varun Sharma

Founder

Jan 5, 202610 min read
Building Multi-Language Support for 500 Million Users

India's Language Diversity

India has 22 official languages and hundreds of dialects. When we set out to build Agent Rush, we knew English-only support wouldn't cut it. Over 90% of India's internet users prefer content in their native language.

The Technical Challenges

1. Script Diversity

Indian languages use multiple scripts—Devanagari, Tamil, Telugu, Bengali, and more. Each has unique characteristics:

  • Right-to-left vs left-to-right rendering
  • Complex character combinations (ligatures)
  • Varying text directions and layouts
  • 2. Code-Mixing

    Indians naturally mix languages. A single message might contain:

    "Yaar, mera order kab aayega? Maine last week order kiya tha"

    This Hindi-English mix is called "Hinglish" and it's incredibly common. Our models needed to understand it.

    3. Transliteration

    Many users type Indian languages using English characters:

  • "Dhanyavaad" instead of "धन्यवाद"
  • "Nandri" instead of "நன்றி"
  • Our Solution

    Language Detection

    We built a multi-stage detection system:

  • Script detection - Identify the writing system
  • Statistical analysis - N-gram frequency matching
  • Contextual understanding - Use conversation history
  • Custom Models

    We fine-tuned language models specifically for:

  • Indian English (different from US/UK English)
  • Code-mixed conversations
  • Regional expressions and idioms
  • Real-Time Translation

    For agents that need to respond in different languages, we built a translation layer that preserves:

  • Tone and formality levels
  • Cultural context
  • Brand voice consistency
  • Results

  • 12 languages supported natively
  • 95% accuracy in language detection
  • < 100ms additional latency for translation
  • Building for India taught us that language support isn't just translation—it's cultural understanding.

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    Varun Sharma

    Founder

    Building the future of customer support at Agent Rush. Passionate about AI, product design, and creating delightful user experiences.