Chaichalerm Sudsaeng

Fullstack Developer with 3+ years of experience building responsive, production-ready web applications with a frontend focus. Strong foundations in HTML, CSS, JavaScript, PHP, and SQL, extended with React, Next.js, TypeScript, and Laravel. Skilled at turning Figma designs and image-based references into pixel-accurate, responsive interfaces, integrating REST APIs, and understanding end-to-end system flow. Comfortable handling frontend delivery along with backend, database, and deployment tasks.

Fullstack Developer — Freelance / Contract at Self-employed (2022-04 – Present)

• Delivered 10+ responsive web applications and client websites end-to-end using React, Next.js, TypeScript, and Tailwind CSS, handling both frontend build and basic backend integration.
• Converted Figma designs and image-based mockups (Photoshop) into pixel-accurate, responsive production UI with consistent layout across devices.
• Connected the frontend to backend REST APIs and built backend features and database logic with Laravel and MySQL.
• Improved a client site's Google Lighthouse score from 65 to 92 through image optimization, lazy loading, and metadata improvements.
• Implemented technical SEO (metadata, Open Graph, structured data, sitemaps) and resolved Core Web Vitals issues using Search Console and PageSpeed Insights.
• Built reusable component libraries to cut duplicated code and speed up delivery across multiple projects.
• Developed LINE OA solutions: Rich Menu, Flex Message, and AI chatbots via the Messaging API, with automation through Google Apps Script and n8n connecting LINE, Google Sheets, and external APIs.
• Managed Git workflows and deployments across GitHub, GitLab, Vercel, and Netlify.
• Collaborated with senior developers during code reviews and followed team coding standards.
• Tested features and fixed issues before release to keep the codebase stable.

Programmer Intern at Bangkok Web Solution (2021-06 – 2021-10)

• Built full-stack features with PHP (Laravel) and MySQL as part of a structured development team.
• Diagnosed and fixed long-standing bugs in legacy code, improving system stability and reducing the error rate.
• Wrote SQL queries and contributed to database schema decisions for new features.
• Worked within Agile sprints and weekly requirement reviews.

B.Eng. in Computer Engineering – Rajamangala University of Technology Phra Nakhon (2022)