Rizon Kumar Rahi

Rizon Kumar Rahi

Full Stack Developer at P-41

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Proof of impact

How I create product and engineering impact

This page is for fast evaluation: what I own, how I lead, and the kinds of measurable outcomes I have delivered across payments and commerce teams.

Full-stack deliveryFrontend systemsPayments & commerceMentoring & quality

Faster page loads

Reduced page load times by 45% using Next.js SSR and optimized rendering strategies at P-41.

Improved query performance

Optimized database queries with TypeORM and indexing strategies, achieving 60% faster query execution.

Concurrent users supported

Built scalable applications handling 10,000+ concurrent users with reliable uptime and performance.

Projects delivered

Led a team of 5 developers and delivered 15+ projects on time with high quality and production readiness.

Increased user engagement

Drove a 30% increase in user engagement on the UnderArmour project through frontend optimizations at Dentsu.

Core Expertise

How I contribute across the stack

A recruiter should be able to see my shape quickly: strong frontend depth, practical backend delivery, modern testing discipline, and product-minded leadership.

Frontend

  • React
  • Next.js
  • JavaScript
  • TypeScript
  • Tailwind CSS

Backend

  • Node.js
  • NestJS
  • Express.js
  • Prisma ORM
  • REST APIs

Database

  • MongoDB
  • PostgreSQL
  • TypeORM
  • MySQL
  • Prisma

Tools

  • JIRA
  • Figma
  • WebStorm
  • VS CodeVS Code
  • CursorCursor
  • Postman
  • Codex

DevOps & Workflow

  • Git
  • CI/CD
  • Claude Code
  • Docker
  • Vercel

Architecture

  • System Design
  • HLD
  • LLD

Case Studies

Company-safe examples of how I work

I have not centered this site around personal projects because my strongest work has come from shipping real products in real teams. These case studies focus on ownership, constraints, and outcomes without exposing confidential details.

Particle41

Synemi — Community management platform

2025 – Present

Context
Built a full-stack community management platform (Synemi) for Particle41, serving as the sole full-stack developer owning both the Next.js web client and NestJS API.
Problem
The client needed a production-grade platform with complex domain logic — document management, architecture requests with voting workflows, granular role-based permissions, and multi-association support — all with enterprise-level security.
What I owned
Owned both codebases end-to-end: the web client with 50+ reusable components, server routes, and centralized state management, plus the API with layered architecture, auth guards, database repositories, API documentation, and end-to-end test coverage.
What changed
Delivered a production platform with granular permission system (VIEW/EDIT/ADMIN per resource), document manager with tree/search/bulk-move, architecture request workflows with voting and expiry, and comprehensive e2e test coverage across both codebases.
  • Next.js
  • NestJS 11
  • TypeORM
  • PostgreSQL
  • TypeScript
  • Redux
  • Vitest
  • Playwright
  • Supertest

Particle41 (Synemi)

Document manager with granular permissions

2025 – Present

Context
Synemi needed a full document management system with folder/file hierarchies, search, and fine-grained access control tied to association roles.
Problem
Users needed to upload, organize, search, and share documents with different permission levels per role — while handling edge cases like naming conflicts, bulk operations, and nested path resolution.
What I owned
Built the document management UI with tree navigation, drag-and-drop, bulk move, search/sort/filter, and conflict resolution. Built the document API with authentication and role-based permission checks, paginated queries, and per-row access control.
What changed
Shipped a production document manager with folder/file operations, bulk actions, automatic conflict handling, and granular view/edit/admin permissions per role. Comprehensive end-to-end test coverage across all document operations.
  • Next.js
  • NestJS 11
  • TypeORM
  • PostgreSQL
  • TypeScript
  • S3

Particle41 (Synemi)

Authentication, permissions & invitation system

2025 – Present

Context
Synemi required a robust authentication pipeline, role-based permission system, and invitation flow supporting multiple user types across associations.
Problem
The platform needed secure JWT + refresh token flows, switch-persona capability, invitation-based onboarding with auto-accept, and a flexible permission model that could be configured per role per association.
What I owned
Built the authentication API with credential validation, refresh token handling, registration pipelines, and structured error responses. Implemented the permissions layer on the web client with centralized permission state, route-level access gating, and a role editor UI. Built the invitation API with validate, accept, and register flows.
What changed
Delivered production auth with httpOnly refresh cookies, switch-persona, invitation auto-accept, and a permission system with VIEW/EDIT/ADMIN enforced consistently across all API controllers and web routes.
  • Next.js
  • NestJS 11
  • TypeORM
  • PostgreSQL
  • TypeScript
  • JWT
  • Redux
Dentsu logo

Dentsu

Internal reusable component library

2024 – 2025

Context
Frontend teams across Dentsu were building similar UI patterns independently, leading to inconsistent experiences and duplicated effort across projects.
Problem
There was no shared component system, so teams were shipping inconsistent UIs, spending time rebuilding common patterns, and struggling to maintain design coherence across products.
What I owned
Led the creation of a reusable component package with 50+ components — including Accordion, Data Table, Dialog, Drawer, Command, Combobox, and more — used across internal frontend systems. Collaborated with 3 teammates to build comprehensive documentation alongside the library.
What changed
Reduced UI development time significantly by providing ready-to-use, well-documented components. Improved design consistency across teams and established a single source of truth for frontend patterns within the organization.
  • React
  • TypeScript
  • Tailwind CSS
  • Storybook
  • Jest
57 Components built
AccordionAlertAlert DialogAspect RatioAvatarBadgeBreadcrumbButtonButton GroupCalendarCardCarousel

Leadership

How I support teams

My contribution is not just shipping code. I help teams move faster by improving quality, clarifying direction, and supporting the people around me.

  • Led a team of 5 developers at P-41, delivering 15+ projects with consistent quality and on-time execution.
  • Reduced page load times by 45% through Next.js SSR optimization and strategic caching implementations.
  • Improved query performance by 60% with TypeORM optimizations, directly impacting user experience at scale.
  • Built systems handling 10,000+ concurrent users with reliable uptime and strong performance under load.
  • Recognition

    Certifications and awards

    Signals of consistency matter too. These recognitions support the delivery and ownership story shown across the rest of the portfolio.

    45% Page Load Reduction

    P-41

    2025

    Achieved 45% faster page loads through Next.js SSR optimization and caching strategies.

    60% Query Performance Improvement

    P-41

    2025

    Optimized database queries with TypeORM, delivering 60% faster query execution across the platform.

    30% User Engagement Increase

    Dentsu (UnderArmour)

    2024

    Drove 30% increase in user engagement through frontend optimizations on the UnderArmour project.

    Razorpay Payment Integration

    Dentsu

    2023

    Successfully integrated Razorpay payment gateway, resulting in 20% increase in transactions.

    The soul is neither born, and nor does it die. It is not that having once existed, it ceases to be.

    Bhagavad Gita, 2.20