Python Backend Software Engineer (f/m)
Ledger
Software Engineering
Paris, France
Posted on Jan 29, 2025
We’re the forever innovators. On a mission that goes beyond business. Securing digital ownership in a changing world. Unlocking true freedom. We’re revolutionaries.
Looking beyond today. Bridging excellence and pragmatism, with ambition and conviction,to push the limits of what’s possible. That’s what you’ll do here, in this playground of innovation. With leadership and trust, you’ll write the rules of new technology, and create products that redefine security in a digital age.
Founded in 2014, Ledger is the global platform for digital assets and Web3. Over 20% of the world’s crypto assets are secured through our Ledger Nanos. Headquartered in Paris and Vierzon, with offices in UK, US, Switzerland and Singapore, Ledger has a team of more than 500 professionals developing a variety of products and services to enable individuals and companies to securely buy, store, swap, grow and manage crypto assets – including the Ledger hardware wallets line with more than 6 millions units already sold in 200 countries.
Join our Ledger Recover team as a talented Senior Software Engineer and play a key role in building and maintaining the infrastructure and backend systems that ensure the secure recovery of digital assets. This opportunity requires a strong security focus, familiarity with hardware integration (including HSMs), and the ability to work across both software and infrastructure layers.
You'll be a vital part of a highly collaborative, cross-functional team dedicated to delivering the Ledger Recover product.
The team includes:
- 2 Frontend Engineers focusing on crafting seamless and secure user interfaces.
- 2 Backend Engineers ensuring scalable and secure API and infrastructure solutions.
- 1 QA Engineer driving quality and resilience across the product.
- 1 Product Manager defining the vision and roadmap for Ledger Recover.
- 1 Engineering Manager supporting and guiding the team to achieve its goals.
Your mission
- Design, develop, and maintain secure backend services using Python and FastAPI for the Ledger Recover product.
- Implement and enhance testing frameworks with pytest to ensure robustness and security of code.
- Collaborate with the hardware team to integrate software with HSMs and other security devices.
- Build and maintain cloud infrastructure using AWS, Kubernetes, and Helm, ensuring high availability and security compliance.
- Enhance the security posture of the Ledger Recover system, including implementing best practices for cryptographic operations.
- Support quality assurance processes, identifying vulnerabilities and addressing potential threats.
- Optional - Develop and test frontend tools using TypeScript, Next.js, and Playwright to support user interactions
What we're looking for
- Proficiency in Python 3 with experience in frameworks like FastAPI, coupled with a solid understanding of security principles (cryptography, secure system design).
- Proficient in secure code development and testing using pytest, with knowledge of infrastructure tools like AWS, Kubernetes, and Helm.
- Experience with security-focused QA processes, ensuring system resilience.
- Strong problem-solving skills and a security-first mindset, with excellent communication and collaboration abilities.
- Full professional proficiency in English.
- A passion for innovation and secure technology development.
- Familiarity with microservice architecture concepts.
- Nice to have:
- Understanding of HSMs and their integration into software solutions.
- Familiarity with frontend development (TypeScript, Next.js) and end-to-end testing tools (Playwright).
- Prior experience in the blockchain or crypto domain.
What's in it for you
- Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow.
- Flexibility: A hybrid work policy.
- Social: Annual company outing for Ledgerdary Days, plus frequent social events, snacks and drinks
- Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage.
- Well-being: Personal development, coaching & fitness with our dedicated partners.
- Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days.
- High tech: Access to high performance office equipment and gadgets
- Transport: Ledger reimburses part of your preferred means of transportation.
- Discounts: Employee discount on all our products.
We are an equal opportunity employer for all without any distinction of gender, ethnicity, religion, sexual orientation, social status, disability or age.
