Manthan Kumar — Frontend Engineer

Origa AI Platform

AI Chat Widget

Web Builder

ReachInbox

MailVerify

OpeninApp

Since

/////////////////////////////////

2023

Building Scalable Products

I'm a Frontend Engineer with nearly 3 years of experience building scalable web applications using React, Next.js, TypeScript, and JavaScript. I focus on frontend architecture, performance optimization, reusable component systems, and production-grade API integrations.

Passionate about reliability and maintainability — shipping real-time web experiences and clean architecture in fast-paced product environments.

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Career timeline — impact-focused roles

Current · Multi-tenant platform

SDE 2 @ Origa

Dec 2025 – Present · Bangalore, Karnataka

Architecting reusable frontend systems for AI agents, CRM, campaigns, and analytics — with module-level RBAC and an embeddable chat widget.

Architected reusable frontend systems for a multi-tenant platform using Next.js, React, TypeScript, and Tailwind CSS, supporting dashboards for AI agents, CRM, campaigns, and analytics.
Designed a module-level RBAC system with permission-aware routing, UI rendering, and API authorization, improving security and maintainability across product modules.
Built an embeddable web chat widget with real-time messaging, polling fallback, lead capture, domain controls, and REST API integrations for enterprise websites.
Built a supporting Python scraping pipeline with Playwright, Supabase, and n8n to refresh client-agent data and run lightweight unit/status checks — secondary tooling alongside the main multi-tenant product work.

Next.jsReactTypeScriptTailwindPlaywrightSupabasen8n

$5M → $10M ARR

Frontend Engineer @ Outbox Ventures

ReachInbox & MailVerify

Nov 2024 – Dec 2025 · Bangalore, Karnataka

Frontend for ReachInbox.ai and MailVerify.ai — high-volume SaaS UX, Generative AI features, and growth to 10K+ active users.

Engineered frontend experiences for ReachInbox.ai and MailVerify.ai, strengthening usability, scalability, and performance for high-volume SaaS workflows.
Shipped Generative AI-enabled features including a spam keyword checker and auto email reply generator, accelerating campaign execution and improving user productivity.
Revamped mailbox purchasing and onboarding flows, contributing to revenue growth from $5M to $10M ARR.
Created reusable frontend components and resolved 2–4 daily customer-facing Intercom issues, improving product stability and reducing repetitive engineering effort.
Contributed to platform growth across 10K+ active users, $40K MRR, 100K+ campaigns, and 500K+ emails sent.
Implemented AI-assisted SaaS automation interfaces and productivity-focused UI experiences while balancing responsiveness, scalability, and maintainable frontend architecture.
Helped ReachInbox earn recognition as the AppSumo Deal of the Year 2024.

ReactNext.jsTypeScriptGenerative AIIntercom

200%+ click growth

Frontend Engineer @ Outbox Ventures

OpeninApp

Sep 2023 – Nov 2024 · Bangalore, Karnataka

Creator media sharing and affiliate products — monetization flows, AI tools, and major performance refactors under Outbox Ventures.

Launched a Next.js media sharing platform enabling creators to generate over $50K in revenue from 20K+ uploads, expanding creator monetization and audience reach.
Implemented an AI-enabled affiliate link generation interface for YouTube creators, impacting creators with 1M+ subscribers and generating over $15K in revenue.
Refactored legacy frontend components by removing 4,000+ lines of redundant code, reducing bundle size by 50KB and improving performance by 8%.
Streamlined B2B dashboard architecture by centralizing layout logic, preventing unnecessary renders and API calls, and improving dashboard performance by over 50%.
Enhanced platform workflows, UI responsiveness, and product usability, contributing to over 200% growth in average monthly clicks.
Implemented responsive, cross-browser compatible interfaces to deliver consistent user experiences across devices and screen sizes.

Next.jsReactTypeScriptPerformance

Aug 2019 – Jun 2023

B.Tech in Civil Engineering

Dayananda Sagar College of Engineering, Bengaluru

Aug 2019 – Jun 2023B.Tech in Civil Engineering

Dayananda Sagar College of Engineering, Bengaluru

Manthan Kumar

Frontend Engineer building scalable React/Next.js apps with a focus on architecture, performance, and UX.

Bengaluru, India

maxmanthan111@gmail.com

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LinkedIn GitHub

1. Frontend Engineering

React.js / Next.js / TypeScript applications
Reusable component libraries & design systems
Responsive, accessible, cross-browser UI
State management with Redux & React Query
Tailwind CSS & ShadCN UI
REST API integration & production deployments

2. AI Product Interfaces

Generative AI-enabled SaaS workflows
Agentic AI chat widgets & real-time messaging
LLM-based productivity features
User-centric automation interfaces
Lead capture & embeddable product surfaces
AI-assisted campaign and email tooling

3. Performance & Architecture

Bundle size reduction & render optimization
Multi-tenant frontend architecture
RBAC and scalable layout systems
Legacy refactoring & maintainability
Dashboard performance tuning
Clean, production-grade frontend patterns

React

95%

Next.js

92%

TypeScript

90%

JavaScript

93%

Tailwind CSS

90%

Redux

85%

Node.js

80%

GitHub

90%

Docker

75%

MongoDB

70%

MySQL

70%

AWS

68%