Senior Frontend Developer

Hi, I'm
Vahid Hasani

Senior Frontend Developer with 5+ years of experience building and scaling web and mobile applications across fintech, blockchain, and SaaS. I specialize in React, Next.js, React Native, TypeScript, front-end architecture, monorepos, design systems, performance, testing, and clean delivery.

5+
Years Experience
5+
Frontend Engineers Led
100K+
End Users Served
View ProjectsDownload CV

Senior Frontend Developer

React, Next.js, and React Native systems for fintech and blockchain products

React
Next.js
RN
TS
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What I Bring

Practical frontend leadership for fintech, blockchain, and SaaS products that need to scale across web, mobile, and teams.

Frontend Architecture

Designing scalable React and TypeScript systems with component boundaries, performance focus, and maintainable code.

Monorepo Modularization

Introducing Nx-style monorepos, shared libraries, and modular project structure across fintech and blockchain products.

Design Systems

Building cohesive product UI with Material UI, Tailwind CSS, shadcn/ui, responsive patterns, and reusable components.

Quality Leadership

Mentoring engineers, improving PR review workflows, raising Cypress E2E coverage, and aligning delivery with product teams.

Tech Stack

The stack behind maintainable product interfaces, frontend platforms, testing workflows, and blockchain-adjacent products.

Languages and Frameworks

JavaScriptTypeScriptReactNext.jsReact Native

UI Systems

Material UIAnt DesignTailwind CSSshadcn/uiDesign Systems

State and Data

Redux ToolkitReact QueryZustandReact Hook FormFormikYupZod

Engineering and Domain

Nx / TurborepoCypressViteWebpackRspackDockerStellarRSA / Ed25519

Professional Experience

A track record across frontend leadership, fintech, blockchain infrastructure, React Native apps, and product platforms.

Kuknos Co.

Senior Frontend Developer

Sep 2024 - Present
Tehran, Iran
  • Led a team of 5+ frontend engineers building scalable React and TypeScript applications across fintech and blockchain products.
  • Introduced and maintained an Nx-style monorepo architecture, improving code reuse by about 40% and reducing cross-project inconsistencies.
  • Built a cohesive MUI, Tailwind CSS, and shadcn/ui design system adopted across 4+ products, reducing UI delivery time by about 30%.
  • Championed Cypress E2E standards and structured PR review workflows, raising test coverage by about 60% and reducing production bugs.

Sahand ICT

Senior Frontend Developer

May 2023 - Aug 2024
Remote / Canada
  • Built a lending web platform for the Canadian market using React, TypeScript, and Material UI v5.
  • Improved page load time by about 35% through code splitting and lazy loading.
  • Delivered a cross-platform React Native app for iOS and Android with 98% feature parity with the web platform.
  • Improved accessibility through WCAG-focused implementation and API integration work.

Kuknos Co.

Frontend Developer

Mar 2021 - Mar 2023
Tehran, Iran
  • Delivered CBDC client applications using React Native and React.js for 100K+ end users.
  • Built a Stellar-based DEX and NFT marketplace with performant wallet and transaction flows.
  • Created Chrome and Firefox browser extensions for blockchain-based transactions.
  • Designed and developed Secure KYC flows processing 50K+ identity verifications.
  • Implemented digital certification and PDF signing with RSA and Ed25519 keys.

Areatak

Backend and Blockchain Developer

Oct 2020 - Feb 2021
Tehran, Iran
  • Developed enterprise chaincode on Hyperledger Fabric using JavaScript and TypeScript.
  • Built NestJS wallet backend services supporting high-volume wallet operations.

Freelance

Backend Developer

Jul 2019 - Sep 2020
Remote
  • Managed product development for Jimbo Market, leading a team of 4+ engineers end to end.
  • Developed Laravel backend services and a Node.js/NestJS user-behavior analytics microservice processing 1M+ events per month.
  • Built a React and Ant Design PWA plus an OTT/VOD subscription service using NestJS, Next.js, PostgreSQL, Redis, and queues.

Selected Work

Product work from fintech, blockchain infrastructure, identity verification, marketplace, analytics, and media platforms.

CAD

Canadian Lending Platform

Built a React, TypeScript, and MUI v5 lending platform for the Canadian market, improving page load time with code splitting and lazy loading.

ReactReact NativeTypeScriptMUI v5
View project
DEX

Kuknos Blockchain Products

Delivered CBDC clients, Stellar-based DEX and NFT marketplace flows, wallet interactions, browser extensions, and Secure KYC systems.

ReactReact NativeStellarKYC
View project
PDF

Digital Certification App

Implemented digital certification and PDF signing flows using RSA and Ed25519 keys, reducing manual signing effort.

ReactDigital SignatureRSAEd25519
Professional project
OTT

Commerce, Analytics, and OTT

Managed Jimbo Market delivery, built behavior analytics services processing 1M+ monthly events, and developed an OTT/VOD subscription platform.

NestJSNext.jsLaravelPostgreSQL
View project

Let's Connect

Reach out for senior frontend development, React/Next.js architecture, React Native apps, design systems, or fintech and blockchain product work.

Email

vahidhasani09@gmail.com

Phone

+98 901 721 8950

Location

Tehran, Iran

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