Senior Software Security Engineer, Ledger

Ledger

Location:
France, Paris

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Not provided

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Job Description:

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.

Job Responsibility:

Collaborate with development teams to identify and address vulnerabilities in backend services, APIs, and supporting infrastructure
Research cutting-edge offensive security techniques
Develop tools and exploits for our products, and provide fixes for them
Conduct security assessments and threat modeling for Ledger's services ecosystem, including DeFi services and Ledger Live-related services
Promote writing secure code to engineering teams
Present your work in academic and hacking conferences all over the world

Requirements:

Some experience in security
experience in blockchain security is a plus
Good knowledge of applied cryptography
Basics in financial services
Self motivated with a strong ability to work and maintain security knowledge in a changing landscape
Strong experience in web/backend pentesting
Fluency in Python, Rust, including secure programming in these languages
Kubernetes and cloud infrastructure knowledge are required
Basic knowledge of Scala programming is a plus
Experience in HSM security is a plus
Good knowledge of exploitation techniques, and of mitigations against such techniques
Development of tools that automate security analysis
Design of secure architecture
Ability to develop and document methods, standards, and guidelines

Nice to have:

Experience in blockchain security
Basic knowledge of Scala programming
Experience in HSM security

What we offer:

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, including Apple products
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products

Additional Information:

Job Posted:
July 26, 2025

Employment Type:

Fulltime

Work Type:

Hybrid work

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Senior Software Security Engineer