Hi, I'm Tapadyuti.

Staff Software Engineer and Google Cloud Certified Professional Cloud Architect building distributed commerce, fulfillment, and marketplace platforms with principal-level technical leadership.

Explore My Work Connect

Tapadyuti Chatterjee portrait
Bio

Hello.

I'm a Staff Software Engineer and Google Cloud Certified Professional Cloud Architect with 13+ years of experience architecting distributed systems, APIs, and cloud-native platforms. I lead complex 0-to-1 marketplace capabilities across 10+ partner teams, combining hands-on engineering with technical direction from strategy through production. Recent programs have contributed to a $2.65B long-range plan while strengthening platform reliability, automation, and engineering velocity.

I am a pluviophile and love riding my Royal Enfield. I live and work in Sunnyvale, California, in the heart of Silicon Valley.

Know more about me below:

GitHub
LinkedIn
Android Apps

Photography

Outside engineering, I enjoy photography as a way to slow down and notice detail. I am especially drawn to wildlife, nightscapes, timelapse, and the occasional portrait.

My

Work Experience

Walmart Global Tech

Staff Software Engineer
Nov 2024 - Present

End-to-end technical lead for marketplace preorder and fulfillment capabilities across seller, order, inventory, and delivery workflows. Co-architected enterprise integrations including a 2,800-location third-party delivery model tied to a $25M+ annual opportunity, while leading 3 FTEs and 7 contractors across multi-team initiatives.

Walmart Global Tech

Senior Software Engineer
Sep 2022 - Oct 2024

Founding engineer for a 0-to-1 local marketplace platform spanning seller onboarding, store management, and order lifecycle architecture. Delivered eight-figure first-year revenue outcomes, created cross-platform target-state designs, and was promoted to Staff in Nov 2024.

Walmart Labs India

Senior Software Engineer
Apr 2020 - Aug 2022

Built marketplace API microservices for inventory, shipping, and seller configuration; improved availability to 99%+ with blue-green deployments and production observability. Delivered store fulfillment and 3PL capabilities, including foundational APIs adopted by thousands of sellers.

Morgan Stanley

Senior Manager, Technology
May 2017 - Apr 2020

Designed distributed reference-data and document-processing platforms, replacing a third-party imaging system and saving $2.3M annually. Applied machine learning and large-scale text processing while technically leading geographically distributed engineering teams.

SAP Ariba

Product Engineer
May 2015 - Apr 2017

Built a multi-tenant, horizontally scalable collaboration and messaging platform for enterprise buyers and sellers, improving turnaround by 50%+ and enabling reliable communication across web and mobile channels.

Tata Consultancy Services

System Engineer
Jan 2013 - Apr 2015

Delivered enterprise applications across retail, insurance, and banking; improved Java heap usage by 40%, reduced PL/SQL batch runtime by 30%, and automated workflows to reduce manual effort by 80%+.

Leadership in Practice

Recommendations

Feedback from collaborators and leaders across my engineering journey, presented from newest to oldest.

Read all on LinkedIn
Alexander Goslin

Alexander Goslin

Walmart colleague · August 2026

“An excellent leader and mentor who brought a tremendous amount of knowledge.”

Leadership · Mentorship · Team enablement

Jerin Philip

Jerin Philip

Senior Software Engineer at Walmart · August 2026

“Directly contributed to my rapid growth and promotion at Walmart.”

Distributed systems · Ownership · Engineer growth

Vishal Jogi

Vishal Jogi

Principal Software Engineering Manager at Microsoft · December 2021

Creative, well-organized, and exceptionally detail-oriented, Tapadyuti brings thorough analysis, excellent mentoring abilities, and strong documentation to every team.

Amarpreet Basi

Amarpreet Basi

Software Developer · June 2021

Diligent, creative, and reliable, Tapadyuti pairs curiosity and enthusiasm for technology with a thoughtful, professional approach to solving problems.

Anoop Deshpande

Anoop Deshpande

ML Engineering at Walmart Labs · April 2021

Tapadyuti combines technical and architectural depth with strong leadership. He evaluates complex requirements carefully, communicates clearly, and develops elegant designs with robust launch strategies.

Kumar Nitesh

Kumar Nitesh

Engineering Lead · May 2016

A collaborative team player with strong Java and J2EE expertise, Tapadyuti applies excellent analytical skills to quickly shape technical solutions for business challenges.

Manju Prasad

Manju Prasad

Technical Architect · April 2016

Manju highlights Tapadyuti's passion for learning, thoughtful hackathon work, attention to detail, humility, and willingness to help teammates—and recommends him for bigger roles.

Samiran Saha

Samiran Saha

Principal Engineer · April 2016

A key contributor to crucial deliverables, Tapadyuti combines deep enthusiasm for technology with a willingness to go the extra mile and align engineering decisions with customer needs.

Ayan Pradhan

Ayan Pradhan

Assistant Professor at Techno India University · January 2015

Ayan remembers their work together at the Saha Institute of Nuclear Physics as a valuable experience and credits Tapadyuti with helping him learn a great deal during the project.

Debatosh Basak

Debatosh Basak

Oracle Techno-Functional Consultant · January 2015

Result-driven, inspiring, and energetic, Tapadyuti brings persistence, relationship-building, deep technical knowledge, and a serious commitment to teamwork.

Avadhoot Kulkarni

Avadhoot Kulkarni

Account Leader · July 2014

Avadhoot describes Tapadyuti as intelligent and mature, with an ability to see the big picture while solving problems, excellent command of technology, and a strong focus on objectives.

Verified Credentials

Professional Certifications

Google Cloud certifications spanning solution architecture, hands-on cloud engineering, and the business application of cloud technology. Each badge links to its public Credly verification.

Google Cloud Professional Cloud Architect certification badge
Google Cloud

Professional Cloud Architect

View verified credential
Google Cloud Associate Cloud Engineer certification badge
Google Cloud

Associate Cloud Engineer

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Google Cloud Digital Leader certification badge
Google Cloud

Cloud Digital Leader

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Selected Recognition

Awards for leadership, innovation, and delivery

Walmart

Bravo Award

Recognition for high-impact marketplace leadership and delivery.

Morgan Stanley

Grass Root Innovation Award

Recognition for practical engineering innovation.

Morgan Stanley

Leadership Award

View certificate
SAP Ariba

Summit Award

View certificate
Selected Impact

Architecture & Platform Programs

Selected cross-platform programs where I set technical direction, aligned partner teams, contributed production code, and carried architecture through launch and operational readiness.

05

Cross-Platform Technical Direction

Set the Local Finds roadmap across architecture, operations, and holiday readiness, aligning 10+ partner teams and delivering eight production releases with zero outages during Holiday 2025.

04

WFS Marketplace Preorder

Co-led cross-system architecture and developed Enterprise Inventory production code for one of Walmart's first WFS-fulfilled preorder implementations, launched for Seller Summit 2026.

03

Enterprise & Grocery Expansion

Co-architected enterprise integrations and developed production code supporting 1-800-Flowers across 2,800+ florists and $27M+ annual GMV, plus a grocery expansion targeting $1M initial GMV.

02

Reusable Order Automation

Co-architected reusable Order Smarts and Auto Pause services adopted across multiple marketplace verticals, processing 5,000+ orders, automating 85%+ of seller actions, and protecting a $70K+ cycle.

01

Collectibles Data Enrichment

Partnered on architecture and implementation for a multi-million-product collectibles catalog, enriching trading cards, games, toys, and coins with external Ludex and Vardera data.

00

Local Finds Seller Platform

Founding engineer for seller onboarding, store management, and order architecture across 10+ teams; helped grow the program from 0 to $200M FY26 and a $2.65B FY29 forecast.

Built in Public

Open Source Libraries

Featured library

Bengali Calendar

Java 21

Convert between Gregorian and Bengali dates using both the Bangladesh Revised and West Bengal Traditional calendar systems. The library includes Bengali and English formatting, parsing, date arithmetic, holidays, and java.time chronology integration.

Two calendar systems Bengali script Formatting & parsing Apache 2.0
Maven dependency 
<dependency>
  <groupId>com.tapadyuti</groupId>
  <artifactId>bengali-calendar</artifactId>
  <version>1.0.0</version>
</dependency>
View source & installation Maven Central Read the Javadocs
Testing utility

Flaky HTTP

Java 11+

A lightweight wrapper around Java's standard HttpClient that injects controlled latency and synthetic HTTP errors. Use it to exercise retries, timeouts, circuit breakers, fallbacks, and observability without adding runtime dependencies.

Sync & async URL targeting Zero runtime dependencies
Maven dependency 
<dependency>
  <groupId>com.tapadyuti</groupId>
  <artifactId>flaky-http</artifactId>
  <version>1.0.0</version>
</dependency>
View source & installation Maven Central Read the Javadocs
Play Store

Android Apps

Published weekend Android apps built for practical utility and fun. No ads, no monetization, just focused product craftsmanship and continuous learning.

Mathastic app icon

Mathastic

Fast-paced mental math drills with missions, streaks, and daily challenges. Designed to improve arithmetic speed, focus, and pattern recognition through short, repeatable game loops.

View on Google Play

SmartNote app icon

SmartNote

A lightweight note-taking app for capturing, organizing, and sharing ideas quickly. Built with a productivity-first workflow to keep note creation and retrieval simple.

View on Google Play

Excuse Me app icon

Excuse Me

A playful utility app that generates random excuse prompts with a single tap. Built as a compact experimentation project around UI simplicity and lightweight interaction design.

View on Google Play

App Store

iOS Apps

Selected iPhone apps built to make everyday learning and productivity feel lightweight, polished, and fun.

Mathastic app icon

Mathastic

Learn math with fun challenges across Timed Sprint, Practice, Endless, and Daily Challenge modes. Built for fast mental math, with missions, XP, unlockable themes, and detailed progress tracking.

View on the App Store

Featured

Blog

Latest long-form writing across Dev.to and LinkedIn, including architecture notes, engineering reflections, and product-building lessons.

Making HTTP Fail on Purpose article cover

Making HTTP Fail on Purpose: Building a Small Chaos Library for Java — Flaky HTTP

Why and how Flaky HTTP injects controlled latency and synthetic errors around Java's standard HttpClient, with design lessons on cancellation, response handling, and deterministic resilience testing.

Read on Dev.to

A Date Is Never Just a Date article cover

A Date Is Never Just a Date: From West Bengal's Panjika to a Bengali Calendar Library for Java 21

A personal and technical account of translating Bengali calendrical culture into a Java API, while keeping regional conventions, localization, and java.time interoperability explicit.

Read on Dev.to

Tab Timekeeper extension popup showing elapsed browsing time

Building Tab Timekeeper: A Small Chrome Extension for Making Browsing Time Visible

A lightweight Chrome extension walkthrough that explains how Tab Timekeeper makes time spent on the current website visible in the active tab using Manifest V3, a service worker, a content script, and plain JavaScript.

Read on Dev.to

Building Mathastic Twice article cover image

Building Mathastic Twice: One Math Puzzle Game, Two Native Architectures

A deep dive into shipping Mathastic natively on iOS and Android, covering architecture choices, shared domain modeling, and platform-specific implementation tradeoffs in SwiftUI and Jetpack Compose.

Read on Dev.to

Exploring Google Gemini and Vertex AI

Exploring Google Gemini and Vertex AI Platform for a Swift iOS App

A practical exploration of integrating LLM capabilities into an iOS app, including architecture tradeoffs, model options, and why Gemini + Vertex AI were selected for the use case.

Read on LinkedIn

Rediscovering Android app development

Rediscovering Android App Development after six years

A reflection on returning to Android using Kotlin and Jetpack Compose, with lessons on rebuilding velocity, applying MVVM patterns, and shipping weekend apps to the Play Store.

Read on LinkedIn

Cross platform app development journey

My Journey of Building Cross Platform Mobile Application with Ionic Framework and Apache Cordova

A step-by-step build-and-deploy walkthrough focused on environment setup, tooling, and deploying an Ionic/Cordova mobile app from local development to device testing.

Read on LinkedIn

Personal

Photography

Photography is where I trade system diagrams for stillness. It keeps the site personal without taking it away from the professional story.

I am most drawn to wildlife, nightscapes, timelapse, and travel moments that reward patience and observation.

The website stays curated; Instagram hosts the living gallery.

View on Instagram

Steller's jay with wings partially spread, showing vivid blue feathers
Wildlife

Steller's Jay

A dramatic wing spread and electric blue detail make this one instantly memorable.

Coyote standing in warm golden light against a soft green background
Wildlife

Coyote at golden hour

The backlight, posture, and soft background give this frame a calm cinematic feel.

Hummingbird hovering mid-flight against a soft bokeh background
Wildlife

Hummingbird in flight

The suspended motion and soft bokeh make this one feel both delicate and alive.

Snowy egret standing in blue water with a reflection below
Wildlife

Snowy Egret

Elegant light, clean reflection, and negative space give this portrait a polished finish.

Connect

Let's Connect

If you'd like to talk about distributed systems, open-source Java libraries, product-minded engineering, or photography, I would be glad to hear from you.

Email

The best channel for introductions, collaboration, and speaking opportunities.

tapadyuti.chatterjee@gmail.com

LinkedIn

For professional updates, featured writing, and broader platform work.

View profile

GitHub

For code, experiments, and the occasional side project in public.

Browse repositories

Instagram

For the personal side: travel, photography, and moments outside engineering.

Open gallery