Senior PHP Developer (High-Load / AI-First) Hello! We at GemFinder are looking for a Senior PHP Developer for our client – an international company in mobile analytical marketing. The project is a proprietary High-Load TDS system (Traffic Delivery System). Scale and Load: > 1 billion clicks per month. 5–8 milliseconds to process a single click (targeting, limit checks, anti-fraud, and redirect). What you will do: Understand the existing monolith architecture (Yii2) and make changes safely. Design new modules (link split tests, anti-fraud, optimization algorithms). Optimize the system for high loads (caching, queues, working with ClickHouse). Develop API and integration services (postback). Maximize automation of your work: we are looking for an engineer who is fluent with AI (Claude, ChatGPT, API, agents) and uses neural networks extensively to accelerate code writing and routine tasks. Technical Requirements: 4+ years of backend development experience in PHP (7.4 / 8.x). Excellent knowledge of the Yii2 framework. Practical experience with ClickHouse and Redis. Confident knowledge of Linux and Docker. Advanced AI-first approach: using paid LLM subscriptions (Claude / ChatGPT / Cursor) for code generation, refactoring, and testing. Working Conditions: Format: 100% remote (European schedule). Payment: From $1,500. Team: Small and strong (Tech Lead + 2 Senior Developers) — minimal bureaucracy and complete freedom of decisions.