NUMBERO, a leading German tech startup revolutionizing after‑sales processes in car dealerships, is looking for a Full Stack Engineer (m/f/d) to join our growing development hub in Valencia.
Por favor, asegúrese de leer atentamente los siguientes detalles antes de enviar cualquier solicitud.
Who We Are
At NUMBERO, our mission is to equip car dealerships with cutting‑edge tools to optimize their after‑sales operations. We integrate trusted sources for parts and labor costs, various Dealer Management Systems, and other relevant data sources. We also leverage metadata analysis to drive intelligent insights. Headquarters in Germany and supported by a growing international team, we focus on innovation, collaboration, and delivering outstanding value to our clients. Our Valencia office plays a key role in shaping the future of our technologies and services.
About The Role
We are looking for a skilled and adaptable Full Stack Engineer to strengthen our development team. You will work across a production‑grade Node.js backend, a React + TypeScript frontend, and the data and AI integrations that connect them. You will report to the Technical Lead and operate with a high degree of autonomy. We value engineers who take ownership of features end‑to‑end – from database schema design to deployed UI – without requiring close supervision. This is not a traditional frontend role. You will regularly work on backend services, job queues, database migrations, authentication flows, and AI‑driven features.
Core Responsibilities
Develop and maintain web application features across the full stack (React + TypeScript frontend, Express.js + TypeScript backend)
Design and implement database schemas, migrations, and optimized queries (MySQL/MariaDB)
Build and maintain REST APIs and integrate them with frontend systems
Work with background job processing, scheduled tasks, and asynchronous workflows
Contribute to AI‑driven features, LLM integrations, and prompt engineering
Integrate web applications with data platforms (PowerBI, Databricks, Azure Data Lake Storage)
Ensure scalable, secure, and production‑ready implementations
Maintain high test coverage and participate in code reviews
Monitor and debug production systems independently
Collaborate with technical and business stakeholders
Required Technical Skills
Frontend & Web
Strong expertise in React + TypeScript
Advanced HTML5/CSS3 (Bootstrap, Tailwind CSS)
REST API design and consumption
Git version control
Backend & Infrastructure
Solid experience with Node.js + Express.js
MySQL / MariaDB – schema design, query optimization, connection pooling, migrations
Redis – caching, job queues, distributed locking
Background job processing (BullMQ or similar queue systems)
Docker – containerization, multi‑stage builds, Docker Compose
JWT authentication and role‑based access control
Scheduled task management (cron jobs)
Data & Cloud
Practical experience with Databricks and Azure Data Lake Storage (ADLS)
Understanding of data pipelines and structured/unstructured data handling
Experience integrating web applications with data platforms (PowerBI, Databricks, ADLS)
Familiarity with Azure services (Azure AD, Static Web Apps, or similar)
Understanding of data synchronization pipelines and ETL processes
AI & Prompt Engineering
Understanding of AI‑driven applications and LLM integrations
Ability to design, test, and refine prompts for reliable AI outputs
Experience working with AI APIs (OpenAI, Azure AI, Anthropic, etc.)
Code Quality & Security
Writing and maintaining unit tests (Jest, Supertest)
Maintaining high test coverage standards (95%+ preferred)
Input validation and schema enforcement (Joi or similar)
Awareness of OWASP Top 10, rate limiting, CORS, and secure authentication flows
NICE TO HAVE
PowerBI API integration and DAX queries
E2E testing frameworks (Cypress, Playwright)
PDF generation pipelines (pdf-lib, Puppeteer)
Email automation systems (Nodemailer, templated dispatch)
Prometheus/Grafana monitoring
Azure Static Web Apps or similar deployment platforms
CI/CD pipeline configuration
Experience with scalable cloud architecture (Azure preferred)
UI/UX design awareness
Soft Skills
High ownership mentality – you treat features as yours from start to finish
Professional and structured communication
Strong problem‑solving ability
AI‑adaptive mindset – comfortable working with rapidly evolving technologies
Team‑oriented but capable of independent execution
Production‑aware – you think about what happens after deployment
Requirements
Professional experience of at least 3 years (mandatory)
English – Fluent (mandatory)
Spanish – Fluent (mandatory)
German – Nice to have
WHY IT'S A GREAT IDEA TO JOIN US
Plenty of room to bring your ideas to life
Modern work atmosphere and office equipment
Company events and activities
Open company culture with flat hierarchies
Always the latest hardware
Flexible working hours
Competitive salary based on your experience
Supportive team spirit
Thorough onboarding
Permanent full‑time position
Access to coaching programs
Career development opportunitiesAttractive educational support programs
Ongoing training options
How To Apply
Still reading?
Great!
Ready to become part of our mission?
As we are looking for someone with a good drive, our hard skill requirements are not too strict. What really matters to us is that you bring your own drive and are eager to make a difference. xpzdshu
Send your CV to
******
with the subject line "Full Stack Engineer".
We look forward to meeting you!
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