Since 2015, papernest has been transforming the way people manage their contracts, making subscription, management, and switching simple through one smart, intuitive platform.

We have supported more than 2 million customers across France, Spain, and Italy. 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.

With over 900 employees, we are strengthening our position as a European market leader.

As a Senior Backend Engineer, you will play a key role in strengthening and scaling the technical foundations of our Spanish market operations.

Your responsibilities:

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.

In a dynamic and fast-evolving environment, you will bring structure and engineering rigor. 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.

Your mission includes:

• Designing and implementing scalable backend services and APIs

• Improving system reliability, performance, and maintainability

• Partnering closely with operations and business stakeholders to understand evolving needs

• Driving technical excellence and reducing technical debt through pragmatic decision-making

• Contributing to architectural standards and long-term platform strategy

• Supporting the scalability of our Spanish market by building robust, future-proof infrastructure

This 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.

Your profile:

• 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.

Technical Expertise:

• 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.

Your Strengths:

• Strong analytical and problem-solving mindset.

• Pragmatic and structured approach in fast-moving environments.

• Fast learner of business domains with the ability to bridge technical and operational topics.

Professional English required; Spanish is a plus.

What We Offer You:

Evolve in an international and inclusive environment: 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!

💸 Compensation: receive Subscription Bonuses for Company Creators (BSPCE) from your first day, in line with company regulations.

🏆 Benefits: as a provider of home insurance and green energy, we offer our employees attractive deals. After all, it shouldn't be just our clients who benefit!

🩺 Health: enjoy mutual health insurance through Alan, offering simple, paper-free management of your healthcare expenses, with 50% covered by papernest.

🍽️ Meals: access the Swile card for meal vouchers valued at €9 per working day, with 50% covered by papernest. Plus, enjoy breakfast every Tuesday at the office, a fully stocked Ideal Garden refrigerator, and discounted rates at partner restaurants for healthy, balanced meals.

📚 Training: your growth is our priority. You'll have continuous training aligned with your goals, whether in technical, language, or managerial skills.

📈 Career Development: numerous opportunities await you to deepen your expertise or explore new directions. We're here to support your professional goals.

✨ 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!

Hiring process:

First call with Wolfgang from the Talent team.

An interview with Sophie, our Engineering Manager.

A technical test and a code review with the Tech team.

A last interview with Raphaël, our CTO.

Interested in this challenge? 🙂

Don't hesitate any longer-we look forward to meeting you! Regardless of your age, gender, background, religion, sexual orientation, or disability, there's a place for you with us. Our selection processes are designed to be inclusive, and our work environment is adapted to everyone's needs.

We particularly encourage applications from women. Even if you feel that you don't meet all the criteria outlined in this job posting, please know that every application is valuable. We strongly believe that diverse and varied backgrounds enrich our team, and we will carefully consider your application. Parity and diversity are essential assets to our success.