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Ledger Logo Ledger · IT - Software Development

Senior Software Architect, Blockchain & DeFi

France, Paris · Job Posted January 20, 2026
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Job Description

This is a hands-on position for a Senior Software Architect to join the Engineering Architecture team. The team is responsible for ensuring the highest level of design quality for both B2C and B2B products, and helping Product teams scope and build the next great features. The role focuses on driving the architecture, integration, and improvement of core services, with a strong focus on new Blockchain protocols and Decentralized Finance (DeFi) applications.

Job Responsibility

  • Lead the technical scoping, design, and architecture for integrating new blockchain protocols and tokens into the Ledger ecosystem
  • Drive the research, understanding, and integration of complex Decentralized Finance (DeFi) protocols (e.g., DEXs, lending, staking) with Ledger services, ensuring security and scalability
  • Collaborate closely with engineering leads, product managers and delivery managers to ensure design on most important initiatives are properly done and of good quality
  • Partner with product teams to define, develop and implement development requirements for new product features
  • Help Engineering managers identify, tackle and prioritize most critical technical debt in our transactional services stack
  • Contribute hands on to the development activities of the squads being supported
  • Become a Ledger solution expert to thoroughly understand all use-case scenarios, especially on areas identified in this job description
  • Be involved in our open source projects and foster our developer community by contributing and maintaining key Open Source software, and helping build our platform strategy
  • Help build visibility on the roadmap by contributing to gross estimates of implementation difficulty
  • Help contribute to Ledger visibility by presenting in conferences or in front of customers our technology know-how

Requirements

  • 10+ years of experience in technical design, development, execution, testing and delivery
  • Deep expertise/interest in backend system architecture, algorithm development, and optimization for high-throughput, high-reliability transactional services
  • Profound, hands-on knowledge of how various blockchain technologies (e.g., Ethereum, EVMs, non-EVMs) work under the hood, and a curiosity to investigate deeply complex, distributed systems
  • Ability to work effectively with internal teams to define scope, goals, project plans and deliverables
  • Team player with excellent interpersonal skills and ability to work cross-functionally
  • Excellent presentation and written communication
  • Engineering degree
  • Expert knowledge of backend development and architecting scalable, secure web services (e.g., Node.js, Python, Scala)
  • Experience with advanced software development practices and patterns for distributed, fault-tolerant systems
  • Deep understanding of smart contract security, token standards (ERC-20, ERC-721, etc.), and the architecture of common DeFi primitives (DEXs, Lending Protocols, Yield Farming)
  • Practical experience with blockchain node interaction (RPC, WebSockets) and building robust, high-availability data indexing and transaction services
  • Strong knowledge of database technologies (SQL/NoSQL) and message queues for asynchronous data processing in backend systems

Nice to have

  • Open source experience or contributions, especially in the blockchain/crypto space
  • Expert knowledge of cryptography and security practices applied to transactional systems
  • Prior experience contributing to or integrating with major DeFi protocols

What we offer

  • Flexible work options - Our hybrid policy allows employees to work from home up to 3 times per week
  • Health & Wellness support - Health and Life Insurance
  • Financial growth opportunities - Employees can become shareholders in Ledger as well as other financial benefits depending on your country of work
  • Commuter allowance - Ledger offers a commuter allowance to contribute to your preferred means of transportation
  • Learning & Development - A comprehensive suite of training solutions providing a personalised learning experience for every employee
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