Hesam Hosseini

Hesam Hosseini

Senior Frontend Developer

About Me

I am a Senior Frontend Developer with over 4 years of professional experience building modern, scalable, and high-performance web applications. I specialize in React, Next.js (App Router), TypeScript, and Tailwind CSS, with a strong focus on pixel-perfect UI implementation, cross-team collaboration, and UX optimization. I work full-time at Vikarno while also building crypto finance platforms at Qaay and handling freelance projects. I'm deeply passionate about delivering fast, accessible, and multilingual web apps, and I'm known for:

  • High-speed delivery and clean code
  • Deep integration of design into development
  • Precise execution of UI/UX
  • Excellent communication within product teams
Hesam Hosseini

Experience

Qaay (Crypto Finance)

Senior Frontend Developer

May 2025 - Present

Built a comprehensive crypto finance dashboard using Next.js 15 and TypeScript, featuring portfolio management, lending, borrowing, swap, deposit, and withdrawal modules; utilized App Router, SSR/ISR, and route middleware to deliver fast and secure user experiences. Designed and implemented a highly reusable UI system with design tokens, memoized selectors, list virtualization, and Suspense-friendly custom hooks, reducing unnecessary re-renders by ~45% and cumulative layout shift (CLS) by ~30% across the entire platform. Implemented full internationalization (i18n) with RTL support for English and Farsi using edge middleware and localized routing. Integrated Payload CMS for content and admin panels while strengthening authentication flows with secure OTP verification and robust session management. Established a modern CI/CD pipeline using Docker and Bitbucket Pipelines with automated linting and test gates.

Vikarno

Senior Frontend Developer

March 2025 - Present

Developed high-performance web applications using Next.js 15, leveraging SSR and CSR to optimize user experience, which led to improved user satisfaction and engagement metrics. Built and maintained multilingual support using next-intl, enabling seamless localization and enhancing accessibility for global users across multiple products. Designed and deployed financial applications, including tools for transaction tracking and loan management, improving operational workflows and user self-service capabilities. Customized and extended the ShadCN component library, ensuring a unified and reusable UI system across projects, which cut down development time by over 100 hours. Applied advanced rendering and caching strategies to boost scalability, resulting in up to 1.5 seconds faster page load times across key routes. Performed comprehensive testing and debugging workflows to uphold code quality, decreasing production bugs by nearly 40 incidents.

Hoopad Vision

Senior Frontend Developer

June 2024 - March 2025

Developed a fully functional and interactive report page using Highcharts library in React.js, enabling data visualization and analytics for over 1,000 monthly active users, leading to a 15% increase in user engagement. Implemented multi-language support in Next.js 14 applications, leveraging internationalization (i18n) libraries to support 3+ languages, improving accessibility for a global user base. Engineered scalable and performant web applications using Next.js App Router, combining SSR (Server-Side Rendering) and CSR (Client-Side Rendering) techniques to optimize load times and enhance user experience, resulting in a 2-second reduction in page load times. Collaborated with backend and design teams to ensure seamless integration of APIs and UI components, reducing integration-related issues by 20%. Conducted rigorous testing and debugging, maintaining 98% code coverage and minimizing production bugs, leading to a 30% decrease in post-release issues.

Freelance Developer

Frontend Developer

June 2024 - March 2025

Engineered high-performance applications using Next.js 14, optimizing user experience through SSR and CSR techniques, resulting in a significant increase in user satisfaction scores. Customized and utilized the ShadCN component library, achieving a consistent and reusable UI across multiple projects. Implemented advanced rendering strategies, enhancing scalability and efficiency of web applications, leading to 1.5 seconds improvement in load times. Conducted thorough testing and debugging, maintaining high-quality standards and minimizing production issues, reducing bug-related incidents by approximately 40 incidents. Collaborated with design and development teams, ensuring seamless UI component integration and reducing integration issues by around 10 major incidents.

MyData-co

Frontend Developer

November 2022 - June 2024

Refactored and analyzed code, improving readability and maintainability, leading to easier future updates and modifications, saving over 150 hours. Developed and maintained a custom UI kit using SCSS, increasing the reusability of components and reducing customization time by around 120 hours. Built a project with Next.js 13, focusing on modern web development practices and performance optimization, reducing page load times by over 60 seconds. Contributed to products that are currently used by over 100,000 users, significantly impacting user engagement and satisfaction. Optimized application performance, resulting in over 30 hours faster load time and a notable increase in user engagement.

Maktab Sharif

Teaching Assistant

August 2022 - Present

Taught HTML and CSS for building and styling web pages, and JavaScript (ES6, ES7) fundamentals and advanced features to over 300 students. Instructed students on TypeScript fundamentals, enabling robust, type-safe code development, resulting in a 30% improvement in student project stability. Guided students through React.js, including hooks, routing, custom hooks, HOC, and state management. Educated on version control with Git and GitHub, including branching, merging, and pull requests, increasing student collaboration efficiency by 30%. Tutored students in testing and debugging web applications using Jest and React Testing Library, improving test coverage by 40%.

Skills

Technology I've worked & dabbled with:

JS
JavaScript
TS
TypeScript
🌐
HTML5
🎨
CSS3
💅
SASS
⚛️
React.js
Next.js
🟢
Node.js
🔄
Redux
🚀
GraphQL
🌿
Git
🐳
Docker
Vercel
📦
Bitbucket Pipelines
ShadCN UI
Chakra UI
🔵
Material UI
📦
Payload CMS
📖
Storybook
🌍
Weblate
🎨
Figma
🔶
Adobe XD

Main skill set 🚀

💡 Click on technologies to highlight categories

Projects

Qaay.com
Qaay.com
A comprehensive crypto finance dashboard featuring portfolio management, lending, borrowing, swap, deposit, and withdrawal modules. Built with Next.js 15, utilizing App Router, SSR/ISR, and route middleware for fast and secure user experiences. Features ~45% reduced re-renders and ~30% improved CLS.
Next.js 15
TypeScript
SSR/ISR
Payload CMS
Docker
i18n
DrErfanOrchid.com
DrErfanOrchid.com
A flower shop e-commerce platform with multi-language support, multi-warehouse management, and multi-location functionality that I designed and developed.
Next.js
SSR
ShadCN
i18n
Caching Systems

Contact Me

Feel free to reach out to me through any of the following channels or by filling out the form.