John Mo (Ivo Iliev)

Senior front-end game developer specializing in online slot and casino games. Over 7 years’ experience with TypeScript, PixiJS, and Spine, delivering 20+ high-performance commercial slot games for tier-1 European operators. Expert in scalable game architecture, custom animation, performance optimization and remote team collaboration.

• TypeScript (2017–present), JavaScript (ES6+)
• PixiJS, Phaser, Spine
• HTML5 Canvas, WebGL, GSAP, TexturePacker
• OOP, modular architecture, design patterns
• UI/UX for casino & slot games
• Performance optimization for desktop/mobile
• Agile/Scrum, Jira, Git, CI/CD
• Remote collaboration, English (Fluent), Bulgarian (Native)

• Freelance / Contract Game Developer
  Self-employed | 2011 – Present
  – Lead developer and consultant for slot and casino games using TypeScript, PixiJS, and Spine.
  – Designed, built, and delivered high-quality gambling and social gaming products for international clients.
  – Mentored junior devs and led small teams for multiple projects.
  Key clients/projects: Crytek Black Sea (MOBA/MMO interfaces), Gameloft (mobile games), IGSoft (casino/poker), Bwin.party (sports betting), MENA Software, XS-Software, and more.
• Lead Game Developer – Jelly Entertainment (Remote, UK/EU)
  2021 – 2025
  – Led development of 10+ commercial slot games for major European operators.
  – Architected scalable game frameworks in TypeScript/PixiJS.
  – Integrated complex animations with Spine and optimized for 60fps on all devices.
  – Collaborated with international teams across design, QA, and backend.
• Junior Front-end Developer / Flash Developer
  Net4You, World Web Management | 2004 – 2009
  – Early-stage interactive games and streaming platforms development (Flash, ActionScript, UI).