Senior Software Architect, Blockchain, DeFi
Ledger
full-time
Posted on:
Location Type: Hybrid
Location: Paris • France
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Job Level
About the role
- 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.
- 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.
Benefits
- 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.
Applicant Tracking System Keywords
Tip: use these terms in your resume and cover letter to boost ATS matches.
Hard skills
backend system architecturealgorithm developmentoptimizationblockchain technologiesbackend developmentNode.jsPythonScalasmart contract securitydatabase technologies
Soft skills
interpersonal skillscross-functional collaborationpresentation skillswritten communicationteam player
Certifications
Engineering degree