Senior Backend Engineer (f/m)

Senior Backend Engineer – Ledger (Paris, France)

This Senior Backend Engineer role at Ledger is a high-impact opportunity to work on secure, scalable infrastructure for financial institutions processing crypto transactions.

Why This Role Matters

Ledger is a global leader in hardware wallets and Web3 security solutions, securing over 20% of the world’s crypto assets. The Ledger Vault is a SaaS solution designed for institutional crypto custody, incorporating multi-authorization, rate-limiting, and time-locking governance rules.

Key Responsibilities

• Develop & scale backend applications for secure crypto transactions.
• Build governance and orchestration layers & complex APIs.
• Work with cryptographic modules (HSMs) and blockchain interfaces.
• Integrate new cryptocurrencies into Vault.
• Collaborate with frontend, QA, core, firmware, infrastructure, and operations teams.
• Troubleshoot critical issues alongside Technical Account Managers.

What They’re Looking For

• 5+ years of backend development experience, preferably in a product-based startup.
• 3+ years working with TypeScript (primary language).
• Node.js expertise (with exposure to Python, Rust a plus).
• Experience with RESTful API design & CI/CD best practices.
• Agile methodology experience (Scrum, Kanban, XP).
• Fluent English communication skills.

Bonus Points

• Experience with Python (Flask, FastAPI).
• Interest in GraphQL, message-based systems.
• Passion for crypto, blockchain, and open-source contributions.

Why Join Ledger?

• Equity options—own a stake in Ledger’s success.
• Hybrid work policy for flexibility.
• Health insurance (medical, dental, vision).
• Personal development & fitness perks.
• 5 weeks of vacation + RTT days.
• Latest Apple gear & transport reimbursement.
• Ledger product discounts.

This role is perfect for a backend engineer who is passionate about secure crypto custody solutions, scalable backend architectures, and blockchain technology. 🚀