AI-Driven Software Engineer (Node.js & C++)

IONOS Group; San Sebastián de los Reyes; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Hybrid work model

Flexible hours

Tech discounts

Job summary

IONOS Group is seeking an execution-driven backend engineer to transform architectural specs into robust Node.js and C++ solutions. You will optimize a hybrid system, leverage AI tools to accelerate development, and implement rigorous tests to ensure stability.

In this role, you will work across Linux environments, manage Docker-based builds, and collaborate with senior architects to push performance and quality in a fast-paced setting.

Qualifications

• 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).

Responsibilities

• Develop backend components in Node.js and high-performance integrations with C++.
• Translate technical specifications into functional solutions.
• 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 in Node.js-C++ interactions.
• Refactor legacy code into clean, high-performance solutions.
• Collaborate with architecture roles to continuously improve the system.

Skills

Node.js

C++

Linux

AI-assisted tools

Tools

Docker

Make

CMake

Job description

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.

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