Kumar Deepansh
Indie Developer & Founder
Overview
Social Links
About
Hello! I'm Kumar Deepanshu, an indie developer and founder with 5+ years of experience building scalable, AI-powered products end to end.
I'm the founder of Lumbox, email infrastructure built for AI agents: a programmable inbox that agents can read, send, and act on through a single API and an MCP server exposing 70+ tools, with its own OAuth 2.1 server, credential vault, and self-hosted mail stack.
These days I build and ship my own products end to end: Lumbox, Ember (a local-only health and activity tracker for Android and Wear OS), and Vidshrink (a free in-browser video compressor), plus open-source work like Dev.UI.
I work across the stack with React, Next.js, TypeScript, Node.js, and Kotlin, on modern cloud and serverless architectures (AWS, Cloudflare). I also bring years of experience as a full-stack engineer and team lead, shipping AI-first marketing platforms serving 1,000+ businesses and mentoring a 14-member team across products like Ashley AI, Poshmom, and YATR.
A Smart India Hackathon winner, I hold IPR for EdTech work impacting 10,000+ students across India. Let's connect and build something groundbreaking together.
Stack
Blog
The Right Way to Move Array Elements in JavaScript and React
- Published on
AI Agent Frameworks: The Best AI Agent Tools in Python, Node.js, and Go
- Published on
Unlocking the Future: The Power of Vertical Large Language Models
- Published on
Tame Your Terminal: 3 Foolproof Ways to Stop Conda Automatic Activation
- Published on
Experience
Lumbox
Current Employer- Building Lumbox, email infrastructure for AI agents: a programmable inbox agents read, send, and act on via a single API and an MCP server exposing 70+ tools
- Designed and shipped a full email stack (sending, receiving, threading, search, contacts) plus an OAuth 2.1 authorization server for secure agent access
- Built a credential vault (AES-GCM, per-org keys) and TOTP 2FA so agents can safely log in to third-party services
- Operate self-hosted mail infrastructure (Haraka SMTP, Dovecot IMAP, DKIM/SPF/DMARC, BIMI) with deliverability tuning
- AI Agents
- MCP
- Email Infrastructure
- OAuth 2.1
- TypeScript
- Cloudflare Workers
- PostgreSQL
- SMTP/IMAP
- System Architecture
- Founder
XAMTAC CONSULTING LLC
Current Employer- Spearheaded creation of AI-powered marketing ERP system (app.xamtac.com), driving 25% increase in client conversion rates and supporting 1K+ daily active users
- Architected key features of Xamtac SaaS platform, driving 35% increase in adoption and 30% boost in client retention: • Engineered asset library system and multi-channel campaign tool, reducing time-to-market by 40% • Implemented PPC reporting and CRM functionalities, increasing lead conversion by 30% • Designed client portal and email marketing suite with no-code builder, elevating email engagement by 50% • Integrated social media platforms with cross-platform scheduling, cutting workflow time by 70%
- Orchestrated CI/CD pipelines and automated testing, reducing deployment time by 40% and mitigating production bugs by 60%
- Promoted to Team Lead, mentoring and guiding a 14-member development team, elevating overall code quality by 35%
- Directed creation and execution of key client deliverables for high-value clients like Poshmom E-Commerce and TalkTales
- React
- Next.js
- Node.js
- TypeScript
- Python
- PostgreSQL
- MongoDB
- AWS
- Docker
- CI/CD
- Team Leadership
- Project Management
- System Architecture
Rebolt (via XAMTAC CONSULTING LLC)
- Leading Xamtac team as Team Lead for Rebolt's full-stack development initiatives
- Architecting and implementing comprehensive test suites to ensure code quality and reliability
- Developing automated ads system for Rebolt's clients, optimizing campaign performance and ROI
- Managing end-to-end full-stack development using modern technologies
- Collaborating with cross-functional teams to deliver scalable solutions
- Full Stack Development
- Test Suite Development
- Automated Ads Systems
- Team Leadership
- React
- Node.js
- TypeScript
- Test Automation
- Ad Tech
- System Architecture
The Volte
- Optimized e-commerce platform, reducing JavaScript bundle size by 40% and improving core web vitals by 130%
- Engineered responsive UI components with Next.js, boosting mobile user engagement by 45%
- Implemented advanced SEO strategies, driving 70% increase in organic traffic within two months
- Next.js
- React
- JavaScript
- TypeScript
- Performance Optimization
- SEO
- Responsive Design
RAAHEE
- Created a mental health platform for booking therapist sessions, processing 500+ daily transactions with optimized RESTful APIs
- Designed a real-time availability calendar, reducing booking conflicts by 60% and streamlining the appointment process
- React
- Node.js
- Express.js
- MongoDB
- RESTful APIs
- Real-time Systems
Projects(17)
Founder. Email infrastructure built for AI agents: a programmable inbox that agents can read, send, and act on through a single API and a Model Context Protocol (MCP) server exposing 70+ tools.
- Full email stack: sending, receiving, threading, search, and contacts
- MCP server with 70+ tools so any agent can run an inbox out of the box
- OAuth 2.1 authorization server for secure agent access
- Credential vault (AES-GCM, per-org keys) and TOTP 2FA for agent logins
- Self-hosted mail stack (Haraka SMTP, Dovecot IMAP, DKIM/SPF/DMARC, BIMI)
- AI Agents
- Email Infrastructure
- MCP
- OAuth 2.1
- TypeScript
- Cloudflare Workers
- PostgreSQL
- SMTP/IMAP
- API Design
Local-only health and activity tracker for Android phone and Wear OS (Galaxy Watch 7). The watch streams raw sensor data to the phone, which runs a research-backed calorie and sleep engine entirely on-device - no servers, no accounts.
- Wear OS app captures accelerometer + heart rate with adaptive sampling
- Phone calorie engine using Mifflin-St Jeor BMR, Hildebrand accelerometer, and Keytel HR equations
- On-wrist + real-movement detection so only genuine active calories are counted
- Sleep detection from wrist actigraphy (Webster rescoring)
- Custom Bluetooth LE bridge between watch and phone (iOS phone path planned)
- Kotlin
- Jetpack Compose
- Wear OS
- Android
- Bluetooth LE
- Room
- Gradle
- Sensors
- On-device Health
Free, private, in-browser video compressor. Compresses and converts video entirely client-side with WebAssembly, so files never leave your device. Open source and deployed on Cloudflare.
- 100% client-side compression and conversion, no uploads
- Powered by ffmpeg.wasm running directly in the browser
- Free with no sign-up, deployed on Cloudflare Workers
- Open source: github.com/kumard3/vidshrink
- Video Processing
- ffmpeg.wasm
- WebAssembly
- Cloudflare Workers
- TypeScript
- React
- Client-side
- SEO
Open-source library of ready-to-use UI templates and components for web3 and modern web apps, built with Next.js and Tailwind CSS. 100+ stars on GitHub.
- Copy-paste landing pages, components, and full templates
- Built with Next.js and Tailwind CSS, fully responsive
- Popular open-source project: github.com/kumard3/dev-ui-templates
- React
- Next.js
- Tailwind CSS
- UI Components
- Web3
- Open Source
- Responsive Design