> Markdown version of [/jobs/ext/3047643-backend-developer](https://www.wearedevelopers.com/jobs/ext/3047643-backend-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Backend Developer

- **Company:** Aleph Holding
- **Location:** Madrid, Spain
- **Salary:** €52,000.0 - €68,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), JavaScript (Programming Language), PHP (Programming Language), C Sharp (Programming Language), Code Review, Data Integrity, Distributed Computing Environment, Distributed Systems, Microsoft Message Queuing, NoSQL, Queueing Systems, RabbitMQ, SQL Databases, Data Streaming, Backend, Event Driven Architecture, Containerization, Kubernetes, Apache Kafka, Front End Software Development, Stream Processing, Data Pipelines, Docker, Microservices
- **Published:** September 24, 2026
- **Apply:** https://www.adzuna.es/contact-us.html

## About the Role

+ 5+ years of professional experience in backend software development.
 + Deep, hands-on experience with designing and building event-driven systems and microservice architectures.
 + Proven expertise with at least one major messaging or streaming platform, such as Apache Kafka, RabbitMQ, AWS SQS/SNS, or Google Pub/Sub.
 + Strong proficiency in a modern backend programming language like PHP and Go. Other languages like JavaScript, Java, C# or Phyton are a plus.
 + Experience with both SQL and NoSQL databases and a clear understanding of their trade-offs in a distributed environment.
 + Practical experience with containerization and orchestration technologies (Docker, Kubernetes).
 + Strategic thinking, leadership and mentoring, exceptional communication and presentation skills, ability to influence and persuade

## Description

We are seeking an experienced Senior Backend Developer who specializes in designing, building, and operating high-throughput, event-driven systems. In this role, you will be a key contributor to our core platform, making critical architectural decisions and mentoring other engineers. You'll be responsible for ensuring our asynchronous services communicate reliably, data flows seamlessly, and our entire ecosystem can scale to meet demand. If you are passionate about message queues, stream processing, and the patterns that make distributed systems work, this is the role for you.Responsibilities:

 + Architect & Design: Design, develop, and maintain scalable and resilient event-driven microservices and data pipelines.
 + Build & Implement: Write clean, high-performance code in PHP. Knowledge of other languages is advantageous.
 + Manage Infrastructure: Own and operate the messaging infrastructure (e.g., Apache Kafka, RabbitMQ, AWS SQS/SNS) that powers our platform.
 + Ensure Reliability: Implement robust error handling, retries, and dead-letter queue (DLQ) strategies to guarantee data integrity and eventual consistency.
 + Observability: Instrument services with metrics, logs, and traces to ensure visibility and rapid troubleshooting in a complex distributed environment.
 + Mentorship & Leadership: Mentor mid-level and junior developers, conduct code reviews, and champion best practices for event-driven architecture (EDA).
 + Collaboration: Work closely with product managers, data scientists, and frontend engineers to build cohesive and powerful features.