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# Senior Backend Engineer

- **Company:** Affle
- **Location:** Barcelona, Spain
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Amazon Web Services, Cloud Computing, Cloud Storage, Code Review, Databases, Relational Databases, Database Queries, Software Debugging, DevOps, Python (Programming Language), Node.Js, Performance Tuning, Standard Sql, Software Engineering, Data Processing, Backend, Complex Event Processing, Apache Kafka, Codebase, Video Streaming, Api Design, Restful APIs, Data Pipelines, Docker, Web Api
- **Published:** September 23, 2026
- **Apply:** https://www.indeed.com/viewjob?jk=9efcb5d9136c37c5

## About the Role

* Strong experience with Python and/or Node.js backend development.
 * Working knowledge of Java and Scala and ability to contribute to an existing Java codebase.
 * Strong experience designing and developing REST APIs.
 * Strong SQL and relational database experience.
 * Experience with Kafka or similar event-streaming technologies.
 * Experience with distributed, scalable backend systems.
 * Experience with cloud infrastructure, preferably AWS.
 * Strong debugging, performance optimization, and production troubleshooting skills.
 * +3 years of experience in AdTech / programmatic advertising & understanding of RTB, OpenRTB, DSPs, SSPs, Ad Exchanges, bidders, impressions, clicks, and advertising reporting.
 * Experience building high-QPS, low-latency systems.
 * Experience with large-scale event processing and reporting pipelines.
 * Docker/containerized deployment and monitoring experience.

Experience

*

 + 5+ years of backend/software engineering experience preferred.
 + We are looking for a strong hands-on engineer capable of independently understanding existing systems and taking ownership across API development, RTB/Ad Exchange services, and reporting/data pipelines.

## Description

We are looking for a Senior Backend Engineer to work across our AdTech platform, including backend APIs, Real-Time Bidding (RTB) systems, and advertising reporting/data-processing services., The engineer will work across Python, Node.js, and Java and should be comfortable owning high-volume, production-grade backend systems., * Design and develop backend APIs for UI and platform functionality using Python and/or Node.js.

 * Build APIs supporting campaign management, configuration, reporting, and platform operations.
 * Develop and maintain Java-based RTB and Ad Exchange services.
 * Work on high-throughput, low-latency real-time advertising request/response processing.
 * Develop and maintain Python-based advertising reporting and data-processing services/scripts.
 * Work with event and reporting pipelines using technologies such as Kafka, databases, and cloud storage.
 * Troubleshoot and optimize production services, database queries, and data pipelines.
 * Participate in architecture, code reviews, testing, deployment, and production support.
 * Collaborate with UI, SDK, DevOps, QA, and other engineering teams.