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Backend engineer turned voice & agent builder.

I've spent the last five years moving between backend engineering, MLOps and applied AI. Today I lead the design of enterprise Voice AI and agentic platforms at Rezolve AI, where conversations across retail and hospitality run through pipelines I help architect.

Before that I built Django services for healthcare and research-management products at Qtanea, shipped Flutter + Django apps for recommendation systems, chatbots and RAG at PrediQt, and freelanced on backend work for a training institute in Montreal.

// how I work

  1. 01Build for scale from day one
  2. 02AI/ML systems that solve real problems
  3. 03Clean, maintainable, production-ready code
  4. 04Data-driven technical decisions
currently:
Lead Engineer, Rezolve AI
based_in:
Kolkata, India
focus:
Voice AI · Agentic AI · Backend
freelance:
Open to projects
education:
B.Tech CSE (AI-ML), 2021 – 2025
Rownak Mazumder, smiling, in front of a forest waterfall

// what I work on

Six things I'm good at.

Real-time Voice AI

Streaming speech pipelines on Pipecat, LiveKit, WebRTC and Azure Speech, tuned for latency, recognition accuracy and natural interruptions.

user › any slots thursday?
agent › 4:30 is free. book it?
user interrupts → agent yields

Backend architecture

Django REST Framework and FastAPI services on PostgreSQL, MongoDB and Redis, with async processing that stays maintainable as it grows.

POST /v1/sessions 201
GET  /v1/menu?store=42 200
POST /v1/orders 202
queued → worker.process_order

Agentic AI & RAG

Multi-agent systems with LangGraph, tool calling and retrieval, connected to business systems through MCP and reusable SDKs.

route_intent
search_catalog (rag)
call_tool: check_stock
compose_reply

Cloud & DevOps

Azure, AKS, Docker, Kubernetes, Helm and CI/CD pipelines that make deploys repeatable and boring, in the good way.

build→test→helm→aks
rollout complete · healthy

MLOps

Packaging, versioning, deployment and monitoring workflows that take models from a data scientist's notebook to production.

recommender v12 · live
rag-retriever v4 · live
chatbot v9 · canary

Mobile & full-stack

Flutter apps with GetX on top of Django and FastAPI backends, from reusable UI components to CI with GitHub Actions.

flutter build apk
GetX · Django REST

// credentials

Education & certifications.

Education

Techno India University

Bachelor of Technology, Computer Science (AI-ML)

2021 – 2025 · West Bengal, India

Certifications

  • Azure AI Fundamentals

    Microsoft

  • OCI 2024 Generative AI Certified Professional

    Oracle

  • Django Essential Training

    LinkedIn Learning

  • Career Essentials in GitHub

    GitHub / LinkedIn Learning

Have a voice or agent problem worth solving?

I take on a small number of independent projects, and I’m always happy to talk shop.

Start a project Just say hi