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# Senior Back-End Developer Python - Cdi - Barcelona

- **Company:** Papernest
- **Location:** Barcelona, Spain (Remote available)
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Business Logic, Software Debugging, Django Web Framework, Python (Programming Language), Reverse Engineering, Systems Integration, Reliability of Systems, Technical Debt, Backend, Fastapi, Code Restructuring, Data Inconsistencies, Api Management
- **Published:** September 20, 2026
- **Apply:** https://www.buscojobs.com.es/senior-back-end-developer-python-cdi-barcelona-en-barcelona-ID-371897516

## About the Role

Compensaciones / Beneficios * Design and implement scalable backend services and APIs * Improve system reliability, performance, and maintainability * Collaborate with operations and business stakeholders to understand evolving needs * Drive technical excellence and reduce technical debt through pragmatic decisions * Contribute to architectural standards and long-term platform strategy * Support the scalability of the Spanish market by building robust infrastructure Responsabilidades * 5+ years of backend development experience with senior-level ownership of architecture and integrations * Proficiency in Python (Django/FastAPI) with event-driven or asynchronous architectures * Experience managing complex API integrations and debugging data inconsistencies across external services * Ability to reverse engineer semi-technical workflows to understand business logic before refactoring * Professional English; Spanish is a plus Requisitos principales * remote work 2 days per week

 * health insurance through Alan * Swile meal vouchers * breakfast every Tuesday at the office * training and career development * BSPCE from day one

## Description

Experteer Overview As a Senior Backend Engineer, you design, build, and evolve scalable backend systems to support growth in the Spanish market.You bridge business operations and technology, translating needs into reliable software with engineering rigor.You contribute to architectural standards, improve reliability and performance, and ensure long-term platform scalability.This role offers impact across cross-functional teams and the opportunity to shape a European market-leading platform.You will own sustainable solutions that enable growth and operational efficiency.Compensaciones / Beneficios * Design and implement scalable backend services and APIs * Improve system reliability, performance, and maintainability * Collaborate with operations and business stakeholders to understand evolving needs * Drive technical excellence and reduce technical debt through pragmatic decisions * Contribute to architectural standards and long-term platform strategy * Support the scalability of the Spanish market by building robust infrastructure Responsabilidades * 5+ years of backend development experience with senior-level ownership of architecture and integrations * Proficiency in Python (Django/FastAPI) with event-driven or asynchronous architectures * Experience managing complex API integrations and debugging data inconsistencies across external services * Ability to reverse engineer semi-technical workflows to understand business logic before refactoring * Professional English; Spanish is a plus Requisitos principales * remote work 2 days per week * health insurance through Alan * Swile meal vouchers * breakfast every Tuesday at the office * training and career development * BSPCE from day one


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