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Avinaba Mazumdar

@avinabamazumdar

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Full-stack software engineer with 4+ years building React/JS/Node high-performance web apps and AI-powered products.

India

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What I'm looking for

I’m looking for a role where I can own full-stack delivery with React/Node, build AI-powered user experiences, and continuously improve performance and maintainability through strong architecture, code quality, and cross-functional collaboration.

I’m a full-stack software engineer with 4+ years building high-performance web applications across CRM, AI, and Fintech. I’ve owned architecture decisions, led code reviews, and mentored a team of 5 engineers while driving cross-functional execution across UI/UX, QA, PM, and C-level stakeholders in Agile JIRA sprints.

At Sunbase, I was promoted from SDE I to SDE II to lead end-to-end delivery—from integrating 6+ fintech lender APIs into a multi-vertical proposal platform to building tools that measurably improved operations (e.g., reducing appointment conflicts, improving admin efficiency by 33%, and cutting configuration time by 40%). I also modernized legacy JSP-driven business logic by introducing modular JavaScript patterns and built AI-powered experiences like an OpenAI LLM-powered chatbot interface that reduced support tickets by up to 25%—and I carry that same focus into my projects, including agentic AI chat with RAG and pgvector embeddings.

Experience

Work history, roles, and key accomplishments

Software Development Engineer II

Sunbase

Jun 2024 - May 2026 (1 year 11 months)

Promoted from SDE I to SDE II to lead architecture decisions, drive Agile JIRA sprints, and mentor a team of 5 engineers while coordinating with UI/UX, QA, PM, and C-level stakeholders. Built and modernized core CRM proposal, scheduling, permissions/RBAC, and workflow automation features, including integrations with multiple fintech lender APIs and a multi-node visual workflow tool.

JavaScript Node REST APIs RBAC Role Based Access Control Agile Jira System Design Drawflow.js Java MySQL JSP Modular JS

Software Development Engineer I

Sunbase

May 2022 - May 2024 (2 years)

Designed and implemented a frontend for the Jared AI chatbot using OpenAI LLM-powered RAG retrieval with streaming, reducing support tickets by up to 25%. Developed RBAC modules & a plugins marketplace, integrated Razorpay billing and analytics dashboards, and built a JSON-driven drag-and-drop funnel builder to accelerate client onboarding.

OpenAI RAG Streaming RBAC AWS S3 Razorpay Chart.Js AG Grid Next.js Drag And Drop JSON Driven Builder

Tabs Space

Developed a productivity Chrome extension that replaces the default new tab page with debounced, signature-aware Chrome Storage updates and React-based tab management. Implemented 60 FPS tab sync and fuzzy search with throttled Chrome API events plus a custom reordering hook, and added a Vitest test suite to prevent regressions.

JavaScript React Chrome extensions Zustand Vitest CSS Modules Framer Motion Throttling Debouncing

VaniPay

Architected a mobile-first fullstack CRM PWA using Next.js SSR and TypeScript with a Python FastAPI backend and server-side schema validation. Built a RAG-based agentic AI chatbot with enforced session and rate limits using Vercel AI SDK and Supabase pgvector, and implemented multi-tenant PostgreSQL with RLS plus Google OAuth.