(Senior) Full Stack AI Engineer (F/M/X) - Valencia

What We’re Looking

La información a continuación detalla los requisitos del puesto, la experiencia esperada del candidato y las cualificaciones correspondientes.

Hello future (Software) Product Engineer.

Everyone at HUBBLR is obsessed about building innovative products with our clients and we hope you are as well. We take pride in believing that the way products should be built in 2026 is a fast moving, iterative approach but, unlike most agencies, we search for talent that understands where we’ve cut corners (and why) and what it takes to scale a software product in the long run – so that the decision making process in the early phases can benefit from experience on what the later phases of a software project look like.

Hence we’re looking for people who are happy to work in entrepreneurial, flexible but fast growing and ever changing environments, can fit into a hybrid culture, and can take ownership in client facing projects.

For this role we’re looking for a seasoned individual who has proven themselves in multiple projects to build fast (with technically creative solutions to hold short delivery cycles) software that can eventually scale with time.

The tech world is changing fast and HUBBLR embraces that change. Culturally we’re looking for people who can and want to ride this wave, leveraging cutting edge technology (we provide sandboxed work environments to maintain our security standards and are always happy to try out new tools).

We expect our people to have a mindset that sometimes we need to unlearn existing knowledge/skills to become better in these new environments.

Most of our clients are situated in Germany, hence a high level of business English is required.

Other than that, we’ll happily welcome you to our Valencia Office (Marítim) with your own workstation.

The role in a nutshell

We are looking for a persona with a background heavily oriented in backend roles but who eventually grew into managing frontends as well, still likes hands on engineering work and loves the product work grind. Any engineer at HUBBLR should be able to take perspective on what a product manager does, meaning also owning the product, iterating on user feedback and bringing in ideas on how to shape products.

Furthermore we’re looking for someone who is willing to take ownership and drive success in our client projects, participate in architectural & technical decision making and is able to build a digital product from early stages to scaling it up.

This role is a hybrid role, meaning we expect you to work at least 2-3 days a week from the office. We have offices in Germany and Spain (Valencia) and enable you to travel, but would like you to spend time in your dedicated office to form a local team culture. This position is looking to be filled in Valencia, Spain – on site days are mandatory.

Your Responsibilities

• You will be supporting us in new and long‑term projects as a (senior) software engineer
  
• You will be joining a growing team of 9, located in Münster, Hamburg, Mannheim and Valencia
  
• Together with our team you will be working mainly on client‑projects and sharing your experience with team members
  
• You will be taking end to end ownership in a delivery cycle with highly autonomous decision making
  
• You will be actively participating in architectural and technological decisions for software projects
  
• You will take over own responsibilities in projects, estimate developing tasks on your own and give other coworkers advice on their work
  
• You’ll be reviewing code from other coworkers and actively be part of continuous improvement
  
• When working on client projects you will be partly responsible for communicating with their CTO/Stakeholder, joining conference calls/meetings on status updates, time estimation and project management
  

Your Qualifications

• Experience in modern backend technologies – i.e. Golang, Node.js (esp. NestJS) (must‑have)
  
• Experience in other backend technologies – PHP (esp. xqbhyrx Laravel), Python (preferred)
  
• Experience in modern web technologies – Vue.js, React.js, Flutter or similar framework (must‑have)
  
• Familiarity with agile software developing methods (must‑have)
  
• Familiarity with responsible coding with LLM based assistants – i.e. Claude Code, Gemini Code, etc. (must‑have)
  
• Experience in common API techniques – GraphQL, GRPC – at least one of them (must‑have)
  
• Communication skills for constructive team feedback and client calls (must‑have)
  
• Analytical thinking & MVP mindset (must‑have)
  
• Fluent in English (must‑have)
  
• Minimum 4 years of experience (must‑have)
  
• Ability to work independently on tasks (must‑have)
  
• Work permit for Spain and living in Valencia or Valencia Region (must‑have)
  
• Experience in E2E tests (nice‑to‑have)
  
• Experience in TypeScript (nice‑to‑have)
  
• Experience in TailwindCSS (nice‑to‑have)
  
• Experience in CI/CD processes (nice‑to‑have)
  
• Experience in eCommerce (nice‑to‑have)
  

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