Sajib Khan

Hey there! I'm a 𝘀𝗲𝗻𝗶𝗼𝗿 𝗥𝗲𝗮𝗰𝘁/𝗡𝗲𝘅𝘁.𝗷𝘀 𝗱𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 with 10+ years of experience transforming slow, buggy applications into lightning-fast user experiences that customers love. Since 2019, I help businesses across the USA, UK, and Europe turn their frontend challenges into success stories.

🥇 Recognized Expertise

I'm not just another developer, I'm a verified technical expert with 𝟮𝟰𝗸+ 𝗦𝘁𝗮𝗰𝗸𝗢𝘃𝗲𝗿𝗳𝗹𝗼𝘄 𝗿𝗲𝗽𝘂𝘁𝗮𝘁𝗶𝗼𝗻, including:

• 𝗚𝗼𝗹𝗱 𝗕𝗮𝗱𝗴𝗲 𝗶𝗻 𝗚𝗶𝘁: Placing me among the top 1% of Git experts globally

• 𝗕𝗿𝗼𝗻𝘇𝗲 𝗕𝗮𝗱𝗴𝗲𝘀 𝗶𝗻 𝗥𝗲𝗮𝗰𝘁 & 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁: Demonstrating proven expertise in core technologies

This means you're hiring someone who doesn't just claim to know these technologies, I actively help thousands of developers solve complex problems in these areas daily.

🛠️ My Technical Expertise

• 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 (𝟭𝟬 𝘆𝗲𝗮𝗿𝘀) & 𝗥𝗲𝗮𝗰𝘁/𝗥𝗲𝗱𝘂𝘅 (𝟳 𝘆𝗲𝗮𝗿𝘀): Building everything from simple websites to complex applications that handle millions of users

• 𝗧𝘆𝗽𝗲𝗦𝗰𝗿𝗶𝗽𝘁 & 𝗡𝗲𝘅𝘁.𝗷𝘀 (𝟱 𝘆𝗲𝗮𝗿𝘀): Writing clean, reliable code that prevents bugs before they happen

• 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻: Making your app fast and responsive through lazy loading, caching and eliminating render blocking

• 𝗠𝗼𝗱𝗲𝗿𝗻 𝗖𝗦𝗦 & 𝗨𝗜 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: Creating pixel-perfect interfaces using Tailwind CSS, Style-components, SCSS, Bootstrap from Figma designs that work flawlessly across all devices

• 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: Ensuring quality with comprehensive testing (Cypress, Jest, Puppeteer)

🏆 Real Problems I've Solved

• 𝗔𝗜-𝗣𝗼𝘄𝗲𝗿𝗲𝗱 𝗗𝗮𝘁𝗮 𝗩𝗶𝘀𝘂𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺: Optimized a complex, data-intensive lead generation dashboard featuring multiple charts, histograms, and interactive maps. Through strategic re-rendering prevention, data caching, lazy-loading, partial prerendering (Next.js 15) and reducing render-blocking code, I transformed a sluggish interface into a snappy, responsive experience—even while processing massive datasets and AI-driven recommendations

• 𝗘𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗧𝗿𝗮𝗻𝘀𝗳𝗼𝗿𝗺𝗮𝘁𝗶𝗼𝗻: Led a complete UI/UX revamp that boosted application performance by 30% through React optimization, lazy loading, caching, and render blocking minimization

• 𝗪𝗲𝗯𝟯/𝗡𝗙𝗧/𝗗𝗲𝗙𝗶 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: Built 100+ reusable TypeScript components for NFT marketplaces (atrium.art & hyy.pe). Implemented MVP features quickly for DeFi Pulse & ETH Gas Station projects. Achieved 95% E2E test coverage and cut time-to-market by 25% through efficient component architecture and streamlined development cycles

✨ The Experience of Working with Me

I believe great technology should be paired with great communication. Here's what that means for you:

• 𝗣𝗿𝗼𝘃𝗲𝗻 𝗧𝗲𝗮𝗺 𝗟𝗲𝗮𝗱𝗲𝗿𝘀𝗵𝗶𝗽: Successfully mentored 50+ developers throughout my career, improving team productivity by 40%

• 𝗖𝗹𝗲𝗮𝗿 𝗖𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻: Regular updates with full time zone compatibility with USA, UK, and European businesses

• 𝗢𝗻-𝗧𝗶𝗺𝗲 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝘆: Consistently meeting deadlines since 2019 across international projects

🌟 What Sets Me Apart

• I've successfully delivered 𝟱𝟬+ 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 for clients worldwide, from startups to established businesses

• A balance of technical excellence and business sense: delivering both beautiful code and business results

• Advanced problem-solving skills honed through competitive programming (ICPC/NCPC participation)

• Deep expertise across the full frontend ecosystem, from React/Redux/Next.js architecture to automated testing

• I'm continually learning and bringing the latest best practices to your project

🚀 Ready to Transform Your React Application?

Let's start with a conversation about your challenges. Whether you need a complete rebuild, performance optimization, or help expanding your current application, I'll provide honest insight about how I can help.

Message me today, and let's discuss how we can make your React/Next.js application 𝗳𝗮𝘀𝘁𝗲𝗿, 𝗺𝗼𝗿𝗲 𝗿𝗲𝗹𝗶𝗮𝗯𝗹𝗲, 𝗮𝗻𝗱 𝗲𝗮𝘀𝗶𝗲𝗿 𝘁𝗼 𝗺𝗮𝗶𝗻𝘁𝗮𝗶𝗻. I'm excited to hear about your project!