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About the Role

We are seeking a developer to build HTML5 slot games using our PIXI/TypeScript framework, integrating with game servers via REST and WebSocket. This role focuses on leveraging AI agents to accelerate game development, from spec to playable build, by creating the necessary tooling and workflows.

Responsibilities

• Build slot games
• Design, build and maintain our multi-platform slots framework in TypeScript and PIXI.js
• Ship new titles end to end, including reel mechanics, win evaluation, bonus rounds, and feature buys
• Integrate with game servers over REST and WebSocket, ensuring correct client behavior during network interruptions
• Optimize performance for draw calls, texture atlases, memory usage, load times, and framerate on mid-range devices
• Build fast prototypes for game designers
• Enforce studio standards for clean code, code review, testing, and documentation
• Own the AI game development workflow, from tooling and conventions to team adoption
• Make the codebase agent-legible with clear instructions, conventions, and typed contracts
• Build agent workflows for scaffolding new titles, generating config from specs, reskinning mechanics, and migrating titles
• Connect agents to real systems like MCP, asset pipeline, and game server API
• Build automated evaluations, golden-master round tests, and maths regression checks for AI-generated code
• Track AI's impact on development speed and eliminate ineffective processes
• Facilitate team adoption of AI workflows through examples and training

Requirements

• 3+ years of professional experience building HTML5 browser-based slot games or comparable real-time HTML5 game work
• Proven PIXI.js and TypeScript expertise
• Strong JavaScript/TypeScript fundamentals and Node.js experience
• Solid experience integrating REST APIs and WebSocket-driven game servers
• Agent-level AI coding experience, working with coding agents on multi-file changes (e.g., Claude Code, Codex, Cursor)
• Experience structuring tasks, repositories, and review loops for AI code generation
• Experience building an AI workflow from 0 to 1, including project instructions, conventions, subagents/pipelines, tool integrations, and automated checks
• A clear understanding of where AI accelerates game development versus where it does not (e.g., boilerplate vs. game feel)
• Cross-browser and multi-device competence, with profiling skills
• Ability to write clean, maintainable code and maintain framework consistency
• Fluent English and ability to collaborate with designers, mathematicians, and QA

Skills

• TypeScript
• PIXI.js
• HTML5
• Node.js
• REST APIs
• WebSocket
• Git
• AI coding agents
• Performance optimization
• Cross-browser compatibility
• Multi-device testing
• Code review
• Testing standards
• Documentation

Location

• London

Work Type

• Onsite
• Full-time

Experience Level

• 3+ years professional experience

Benefits

• Competitive salary
• 20 days annual leave plus 8 bank holidays
• Modern central London workspace
• PS5
• Fruit, drinks, snacks, and beer in the office
• Bicycle parking
• Company socials, outings, and recognition programmes

About the Company

• Arena is a fast-moving digital entertainment company founded in 2021, with brands including MetaWin, WOW Vegas, BetZoo Media, Hit.com and Rolla.
• Teams are located across London, Malta, Gibraltar, and Miami.
• Gladiator Games Studio was founded by individuals with over 16 years of experience in building top-performing slots.
• We combine the agility of a startup with the scale of a high-growth technology company.