Mission Act as the execution engine of the team, transforming architectural specifications into robust, efficient, and production-ready code. You will work on building and optimizing a hybrid Node.js–C++ system, leveraging AI tools as a key accelerator to maximize development speed without compromising quality. Responsibilities: Develop backend components in Node.js and high-performance integrations with C++ Translate technical specifications into functional solutions and accurately Use AI tools to accelerate development, validation, and code improvement Apply test-driven approaches to ensure robustness and stability Manage and optimize build environments (Docker, Make, CMake) Analyze system performance and identify bottlenecks, especially in Node.js ↔ C++ interactions Refactor legacy code into clean, maintainable, and high-performance solutions Collaborate closely with architecture roles to continuously improve the system Requirements Technical: Strong experience with Node.js development Ability to read, understand, and debug C++ code Experience working in Linux environments Familiarity with build tools and containers (Docker, Make, CMake) AI & Development: Hands-on experience with AI-assisted development tools (e.g., Cursor, Claude, or similar) Ability to use AI as a productivity multiplier in software development Experience with iterative development, testing, and validation workflows Profile: Strong English communication skills, as you will be working in an international team Execution-driven mindset with strong focus on quality and results Comfortable working in fast-paced environments Strong interest in performance optimization and continuous improvement What We Offer: Hybrid work model (in any of our offices in Alcobendas, Valencia, Barcelona, Sevilla, or Logroño) Flexible working hours Flexible compensation package Discounts on Arsys products Discounts on technology brands Challenging technical environment with real high-performance system problems Access to advanced AI tools with no usage restrictions Close collaboration with senior profiles and a strong culture of continuous improvement Personalized training and development plans Biannual team events