Hi, I am
Sobhan Aminnejad
Senior Frontend Engineer specializing in building highly effective and user-friendly websites using JavaScript frameworks like React and Next.js.
About me
Versatile and passionate Software Engineer with a strong focus on front-end development and a broad interest in software engineering as a whole. With extensive experience building highly effective and user-friendly websites using JavaScript frameworks like React and jQuery.
I consistently seek opportunities to make impactful contributions that unblock business challenges—whether it's writing APIs, implementing end-to-end tests with Java, or exploring new technologies.
Always open to new challenges and eager to learn, I believe that where there is trust and synergy within a team, my impact improves significantly. My ability to foster collaboration and communicate effectively with cross-functional teams ensures the delivery of high-quality, scalable web solutions that drive business success.
🎓 Education
B. Engineering in Computer
University of Science and Culture, Tehran, Iran • 2019
B. Engineering in Computer
University of Pretoria, Pretoria, South Africa • 2016
📍 Location
Haarlem, The Netherlands
Senior Frontend Engineer at Catawiki
🏆 Key Achievements
- 2024–2025:Delivered +100 minutes of one-on-one ADPList mentorship, guiding junior engineers in React, performance tuning, and career development
- 2024-Q3:Reduced seller-facing build times by 70% (from 20 min → 6 min) by migrating Ruby-templated front-end components to a standalone Next.js architecture
- 2021-Q2:Led the "Bundle Discount" feature—applying total-price discounts on item sets to promote new brands and clear expiring stock—driving a 40% lift in average basket value
- 2019–2020:Migrated multiple legacy apps from vanilla JS & jQuery to React / Next.js, improving maintainability and accelerating developer velocity
Experience
My professional journey through various companies and roles in the tech industry.
Senior Frontend Engineer
- Piloted the seamless migration of lot submission pages, implementing performance enhancements and structured deprecation strategies, leading to a 15% improvement in page load times.
- Optimized frontend performance by refining layout-sharing mechanisms and implementing caching strategies, reducing redundant requests by 30% and boosting site responsiveness.
- Spearheaded a high-impact B2B campaign (Porsche Droomruil), leveraging data-driven UX improvements that increased user engagement by 20%.
- Actively contributed to backend Ruby on Rails development, accelerating feature delivery by 25% and improving team efficiency.
Front-End Team Lead
- Designed and implemented a server-side cart system with a client-side fallback, ensuring uninterrupted transactions and increasing purchase completion rates by 20%.
- Launched a bundle discount feature, driving a 40% increase in average basket value and boosting cross-selling opportunities.
- Improved SEO through a custom SSR solution, resulting in a 30% increase in organic traffic and higher search engine rankings.
- Led CI/CD automation initiatives, reducing deployment time by 50% and minimizing release-related issues.
Senior Front-End Engineer
- Enhanced conversion rates by optimizing UI flows, increasing traffic-to-payment conversions by 15%.
- Strengthened code quality by establishing thorough code review practices, reducing post-deployment issues by over 30%.
- Guided and mentored two frontend interns, facilitating a successful project delivery ahead of schedule.
- Implemented React Server-Side Rendering (SSR), resulting in a 35% increase in organic search traffic and improved page indexing.
Front-End Developer
- Initiated the comprehensive redesign of the B2B panel from jQuery to Ant Design and React, enhancing user interface and functionality.
- Organized component styling using SCSS and SCSS modules, improving maintainability and scalability.
- Led the successful development of a custom hint component for user onboarding, enhancing the user experience.
- Managed and demonstrated various widgets by developing a fully customized, draggable dashboard using React.
Certificates
Check out some of my Certificates, ranging from Web Development Professional to Machine Learning.
Effective Communication
Effective communication for professional and personal growth.
Learning SQL
Master SQL to manage and query relational databases efficiently.
Clean Code
Understand the principles of writing clean, maintainable code.
Technical Writing Essentials
Develop skills to create clear and concise technical documentation.
Understanding TypeScript
Gain a deep understanding of TypeScript for modern web development.
React Styled Components 2019
Learn to style React applications using styled-components.
React vs Angular vs Vue.js
Compare and contrast popular front-end frameworks.
Css Grid & Flexbox
Master modern CSS layout techniques with Grid and Flexbox.
React basics
Learn the fundamentals of React for building dynamic web applications.
ReactJs web development
Comprehensive course on ReactJS for web development.
Javascript from scratch
Learn JavaScript fundamentals from the ground up.
Skills
My technical skills and tools I use in my development workflow.