Theerawut Kainunka

Frontend Developer (TypeScript / JavaScript) Technical Skills Professional Experience Frontend Developer – Sportsbook Platform Frontend Architecture & System Design Web Components & Widget Development Frontend Developer – Casino Platform Key Strengths Additional Experience Freelance Job

Summary
Frontend Developer with 8+ years of experience specializing in high-performance, real-time web applications. Strong background in sportsbook and casino platforms, including real-time odds systems, betting engines, and third-party integrations. Experienced in scalable frontend architecture using monorepo (Nx), state management solutions, and reusable component systems such as Web Components. Highly skilled in debugging, performance optimization, and AI-assisted development.

• Languages: TypeScript, JavaScript
• Frameworks: React (Expert), adaptable to other frameworks
• State Management: Zustand, Redux
• Architecture: Nx Monorepo, Modular Architecture
• Realtime: WebSocket
• Web Technologies: Web Components (Custom Elements)
• Tools & Concepts: API Integration, Performance Optimization, Debugging
• AI: AI-assisted coding, Prompt Engineering
• Mobile: Flutter (Android & iOS)

Key Responsibilities:

• Developed scalable real-time sportsbook applications with high reliability and performance
• Integrated WebSocket for live odds updates, scores, and betting data streams
• Transformed and normalized API data to meet complex business requirements
• Designed and implemented core betting systems:Odds display system
  Bet Slip (Single Bet, Multi Bet, System Bet)
  
• Integrated third-party services such as Betradar for real-time sports data and analytics
• Built and maintained:Real-time odds subscription system
  Bonus and promotion systems
  Live score systems across multiple sports
  Market and event systems
  Virtual sports and simulation betting systems
  
• Designed and maintained Nx Monorepo architecture to manage multiple applications and shared libraries within a single repository
• Built reusable modules and internal frameworks to improve development speed and consistency
• Structured scalable frontend systems to support multiple products and teams
• Developed applications and converted them into Web Components (Custom Elements)
• Built reusable widget systems that can be embedded into external websites
• Ensured cross-platform compatibility and framework-agnostic usage

Key Responsibilities:

• Developed casino frontend systems with multiple game integrations
• Built game search and filtering by vendor
• Integrated real-money gaming with wallet systems
• Ensured seamless UX between third-party providers and platform
• Advanced Debugging:
  Expert in identifying and resolving complex production issues under pressure
• Architecture & Scalability:
  Experience designing scalable frontend systems with monorepo and modular design
• AI-Assisted Development:
  1–2 years of experience leveraging AI tools to accelerate development and improve productivity
• Developed cross-platform mobile apps using Flutter
• Successfully published apps on App Store and Google Play Store