Full Stack Engineer

NUMBERO Spain S.L.

Valencia

Presencial

EUR 45.000 - 65.000

Jornada completa

14 días+

Generador de candidaturas

Transforma esta oferta en una entrevista — un currículum y una carta de presentación creados pensando en lo que quiere el empleador.

Supera los filtros ATS

Ventajas ofrecidas por este puesto de trabajo

Flexible working hours

Permanent full-time position

Career development opportunities

Descripción de la vacante

NUMBERO Spain S.L. is hiring a versatile Full Stack Engineer in Valencia to join our growing development hub. You will work across a Node.js backend, React and TypeScript frontend, and data platforms such as Databricks, supporting data pipelines, integrations, analytics, and AI-driven features.

End-to-end ownership spans database design, API development, deployment, and monitoring. You should be comfortable across application development, data workflows, job queues, migrations, authentication,

Formación

Three+ years of professional experience in full-stack development.
Fluent in English and Spanish; German is a plus.

Responsabilidades

Develop and maintain web features across React/TypeScript frontend and Express/Node backend.
Design database schemas, migrations, and optimized queries (MySQL/MariaDB).
Build REST APIs and integrate with frontend systems.
Handle background jobs and asynchronous workflows.
Contribute to AI-driven features and data platform integrations.
Ensure secure, scalable, production-ready implementations.
Collaborate with stakeholders across technical and business domains.

Conocimientos

React

TypeScript

Node.js

Express.js

MySQL/MariaDB

Redis

Docker

JWT

Cron jobs

Databricks

PowerBI

Azure Data Lake Storage

AI integration

REST API design

Herramientas

Databricks

PowerBI

Azure Data Lake Storage

Docker

Descripción del empleo

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.

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.

Headquartered 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 versatile Full Stack Engineer with strong backend and data engineering skills.

You will work across a Node.js backend, React and TypeScript frontend, and data platforms such as Databricks, supporting data pipelines, integrations, analytics, and AI-driven features.

The role requires end-to-end ownership, from database and API design through frontend delivery, deployment, and monitoring.

You should be comfortable working across application development, data workflows, job queues, migrations, authentication, and production systems.

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