Role

Senior Mobile Engineer (Flutter)

Closed Sofia, Bulgaria (On-site) Engineering Full-time Posted Jul 1, 2026

Role summary

Join an ambitious AI-powered gaming startup and help build the next generation of user-generated mobile gaming experiences.

This role is ideal for experienced JavaScript game developers who have shipped browser-based games from concept to production and want direct ownership of a core product area.

Important

  • On-site role in Sofia, Bulgaria
  • Competitive Salary + meaningful equity
  • Fluent English required
  • Strong JavaScript experience required
  • Proven web game development experience required
  • Portfolio of polished, playable games required
  • Experience shipping games from concept to production
  • Founding team opportunity

Job description

We are looking for a Founding Engineer focused on Web Gaming to build the game creation layer of an AI-powered gaming platform.

Working directly with the founders and AI team, you'll build browser-based games, create reusable game systems, optimize performance, and help define a completely new category of AI-generated entertainment.

Responsibilities

  • Build browser-based games using JavaScript and HTML5
  • Own the game creation layer of the platform
  • Design engaging game mechanics
  • Optimize performance for web and mobile devices
  • Rapidly prototype new gameplay concepts
  • Ship production-ready features and games
  • Collaborate closely with AI engineers, designers, and founders
  • Improve gameplay using analytics and player feedback
  • Help prepare major product releases and investor milestones

Required Skills

  • Strong JavaScript experience
  • HTML5 game development
  • Browser-based game development
  • Proven portfolio of polished web games
  • Experience shipping games from concept to production
  • Performance optimization experience
  • Product ownership mindset
  • Fluent English

Technologies

  • JavaScript
  • HTML5
  • Browser Game Development
  • Web Technologies
  • Mobile-First Development
  • Performance Optimization
  • Rapid Prototyping
  • AI-Assisted Development

Nice To Have

  • Gaming studio experience
  • Hyper-casual or casual games
  • AI-assisted game development
  • Startup experience
  • Mobile gaming experience
  • Leadership experience
  • Founder or early-stage startup background

Soft Skills

  • Entrepreneurial mindset
  • Strong ownership mentality
  • Creativity
  • Product thinking
  • Fast execution
  • Adaptability
  • Collaboration
  • Problem-solving
  • Metrics-driven decision making
  • Comfortable working in ambiguity

Applications closed

This role is no longer accepting applications.

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