I build backend systems and full stack products.

I'm Praveen Yadav, Tech Lead at Niswey in Delhi, India. I build Node.js and PHP systems, AWS serverless messaging and RAG apps for enterprise SaaS clients.

Production work

Built at Niswey. The code is private.

  • ViraHubSpot to WhatsApp send pipeline on AWS Lambda, SQS and DynamoDB. Load-tested to 1.01M messages in one run at about 2,100 a second, with zero data loss.AWS serverless
  • AtlasRAG support agent on WhatsApp, built on the OpenAI API and pgvector. Low-confidence answers go to a human. Live with 5 enterprise clients.RAG
  • WhatsApp for HubSpotTwo-way messaging, contact sync and workflow triggers. Grew to 300+ paying enterprise customers and about 2M messages a day.In production

Side projects

ls -a (all 6) →

Work with me

Open to senior backend, full stack and tech lead roles.

say hello

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Praveen Yadav
Senior backend / full stack engineer, Tech Lead · Delhi, India
Working since 2017. Open to senior backend, full stack and tech lead roles.

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