Software Execution Engine (Full-Stack) – Re-engineering the Future of Office
IONOS · Valencia, Valencian Community, Spain
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- On site
- Full-time
- €60,000 / year
- Valencia, Valencian Community, Spain
Job highlights
- Rebuild core of Nextcloud Office from ground up.
- Transform C++ and JavaScript engine to collaborative suite.
- Leverage AI tools like Claude 4.6 and Cursor.
- Optimize backend, frontend, and system bridges.
- Work in a high-speed, AI-first, hybrid environment.
About the role
About the Role
At IONOS, we aren’t just maintaining code—we are rebuilding the core of Nextcloud Office from the ground up. We are transforming a C++ and JavaScript engine into a collaborative suite with the seamless fluidity of a AAA game engine. Led by a veteran IONOS Engineering Manager, this team operates as a high-speed lab where performance is the absolute priority. We are looking for a hybrid Full-Stack profile capable of navigating the entire ecosystem (Frontend, Backend, and Bridges) with uncommon agility. Your value isn't measured by lines of code, but by how you orchestrate AI to solve complex problems. **Backlog Annihilation:** You are the execution engine that clears technical debt and deploys features at breakneck speed. **Strategic Refactoring:** You will leverage Claude 4.6 and Cursor to crack open "black box" legacy code and transform it into modern, optimized services. **Vertical Slice Prototyping:** You will translate Staff Architects' blueprints into end-to-end functional prototypes in record time. **Digital Archaeology:** You will dive deep into C++ and Linux environments to optimize bridges with the system core.Your Profile: The Deep Generalist
**Technical Mastery:** Full command of Node.js, JS/ESNext, and modern CSS. **AI Orchestrator:** You are an AI Power User, capable of producing the output of a 3-person team using next-gen tooling. **Problem-Solving Mindset:** You’ve likely launched your own projects or come from the gaming industry. You thrive in the chaos of an unfamiliar codebase. **Execution Architect:** You understand system design well enough to ensure AI-generated code remains robust, scalable, and secure.Why IONOS?
**Real Impact:** A long-term strategic project where your footprint on the product will be undeniable. **Vertical Growth:** A brand-new team with high promotion potential and personalized career paths. **Total Flexibility:** Hybrid model, flexible hours (7:00 AM – 9:00 PM), and an inclusive, international culture. **Premium Tooling:** Full access to top-tier AI models (Claude 4.6 Opus) to supercharge your workflow. Stop writing boilerplate. Start building the future of productivity.Key skills/competency
- Full-Stack Development
- Node.js
- JavaScript (ESNext)
- Modern CSS
- AI Orchestration
- Problem-Solving
- System Design
- Legacy Code Refactoring
- Prototyping
- C++
Skills & topics
- Full-Stack Developer
- Software Engineer
- Node.js
- JavaScript
- CSS
- AI
- Nextcloud Office
- IONOS
- C++
- Linux
How to get hired
- Tailor your resume: Highlight full-stack experience, AI tool proficiency, and any gaming industry or personal project achievements.
- Showcase AI expertise: Emphasize your ability to use AI tools to increase productivity and solve complex problems.
- Demonstrate adaptability: Detail experiences navigating unfamiliar codebases or refactoring legacy systems.
- Prepare for technical questions: Be ready to discuss Node.js, modern CSS, system design, and C++ optimization.
- Express enthusiasm for impact: Convey your desire to contribute significantly to a strategic, long-term project.
Technical preparation
Master Node.js, JS/ESNext, and modern CSS.,Practice using AI tools like Claude 4.6.,Familiarize yourself with C++ and Linux.,Review system design principles for scalability.
Behavioral questions
Describe a time you tackled unfamiliar code.,How do you use AI to boost productivity?,Share an experience launching your own project.,How do you handle rapid development cycles?
Frequently asked questions
- What is the primary focus of the Software Execution Engine role at IONOS?
- The primary focus is rebuilding the core of Nextcloud Office from the ground up, transforming a C++ and JavaScript engine into a collaborative suite. This role emphasizes leveraging AI tools to accelerate development and solve complex problems.
- What AI tools are crucial for this Full-Stack Software Engineer position at IONOS?
- Proficiency with AI tools like Claude 4.6 and Cursor is crucial. The role expects candidates to be AI Power Users capable of significantly amplifying their productivity.
- What kind of experience is IONOS looking for in their Full-Stack Software Engineers?
- IONOS is seeking 'Deep Generalists' with full command of Node.js, JS/ESNext, and modern CSS. Experience launching personal projects or coming from the gaming industry, along with strong system design skills, is highly valued.
- How does IONOS support its engineers in this role?
- IONOS provides premium tooling, including full access to top-tier AI models like Claude 4.6 Opus. They also offer total flexibility with a hybrid model, flexible hours, and a clear path for vertical growth within a new team.
- What does 'Backlog Annihilation' mean for a Full-Stack Software Engineer at IONOS?
- 'Backlog Annihilation' refers to the engineer's role in rapidly clearing technical debt and deploying new features at a high velocity, acting as an execution engine for project goals.
- Is this role primarily focused on front-end or back-end development?
- This is a hybrid Full-Stack role, requiring the capability to navigate the entire ecosystem, including Frontend, Backend, and the 'Bridges' connecting them. The emphasis is on a broad understanding and agile execution across all layers.
- What is the significance of 'Digital Archaeology' in this Full-Stack Software Engineer job?
- 'Digital Archaeology' involves deep dives into C++ and Linux environments to understand and optimize the connections (bridges) between the existing system core and the new development efforts.