Since 2015, papernest has been transforming the way people manage their contracts, making subscription, management, and switching simple through one smart, intuitive platform.Along the way, we have continued to invest in new verticals, establishing papernest as a high-performing, innovative, and competitive scale-up in a fast-growing market.As a Senior Backend Engineer, you will play a key role in strengthening and scaling the technical foundations of our Spanish market operations.You will be responsible for designing, building, and evolving backend systems that support business growth, operational efficiency, and long-term scalability. Acting as a bridge between business operations and technology, you will translate operational requirements into reliable, maintainable, and scalable software solutions.You will contribute to architectural decisions, establish best practices, and ensure that backend systems are resilient, performant, and aligned with the company's strategic objectives.Designing and implementing scalable backend services and APIsImproving system reliability, performance, and maintainabilityPartnering closely with operations and business stakeholders to understand evolving needsDriving technical excellence and reducing technical debt through pragmatic decision-makingContributing to architectural standards and long-term platform strategySupporting the scalability of our Spanish market by building robust, future-proof infrastructureThis role requires a hands-on senior engineer who combines strong technical expertise with business awareness, thrives in evolving environments,



and takes ownership of delivering sustainable solutions that enable growth.Bachelor's or Master's degree in Computer Science, Software Engineering, or equivalent practical experience.5+ years of backend development experience, including senior-level ownership of architecture and integrations.Senior-level expertise in Python (Django/FastAPI), including event-driven or asynchronous architectures.Strong experience managing complex API integrations and debugging data inconsistencies across multiple external services.Ability to reverse engineer semi-technical workflows ("shadow IT") to understand business logic before leading refactoring.Professional English required; Spanish is a plus.Everyone has a place at papernest, and with over 46 nationalities, it's common to start a sentence in French and finish it in English or Spanish!After all, it shouldn't be just our clients who benefit!ðo Health: medical insurance through Alan or Sanitas to manage your healthcare expenses in an ultra-simple, paperless way, with up to 50% coverage by papernest (after 6 months in the company).Training: your growth is our priority. You'll have continuous training aligned with your goals, whether in technical, language, or managerial skills.Remote Work: take advantage of 2 remote work days per week to enhance your focus and productivity.️ Legal Advice: access the Ekie solution for dedicated legal and tax advice, helping you manage all your procedures with peace of mind!A technical test and a code review with the Tech team.We particularly encourage applications from women.

📌 Senior Back-end Developer Python - CDI - Barcelona
🏢 papernest
📍 Barcelona