Ledger

About the Company

Founded in Paris in 2014, LEDGER is a global platform for digital assets and Web3. Ledger is already the world leader in Critical Digital Asset security and utility. With more than 6M devices sold to consumers in 200 countries and 10+ languages, 100+ financial institutions and brands as customers, 20% of the world’s crypto assets are secured, plus services supporting trading, buying, spending, earning, and NFTs. LEDGER’s products include: Ledger Stax, Nano S Plus, Nano X hardware wallets, LEDGER Live companion app, [ LEDGER ] Market, the world’s first secure-minting and first-sale distribution platform, and Ledger Enterprise. With its ease of use, LEDGER allows a user to begin investing in digital assets and ultimately, achieve financial freedom in a safe and stress-free environment.

Headquartered in Paris and Vierzon, with offices in London, New York and Singapore, Ledger has a team of more than 900 professionals developing a variety of products and services to enable individuals and companies to securely buy, store, swap, grow and manage crypto assets – including more than 6 millions devices already sold in 180 countries.

Ledger combines either Nano S Plus or Nano X and the Ledger Live app to offer consumers the easiest way to start their crypto journey while maintaining full control over their digital assets. With its ease of use, Ledger allows users to begin investing in digital assets and ultimately, achieve financial freedom in a safe and stress-free environment, with education provided by its Ledger Academy and Quest.

In addition to consumer products, Ledger has also developed Ledger Enterprise, a digital asset custody and security solution for institutional investors and financial players.

Listed Jobs

Company Name

Ledger

Job Title

Scala Software Engineer - Internship

Job Description

Job title: Scala Software Engineer – Internship Role Summary: Internship position within a backend blockchain team focused on building and maintaining scalable Scala-based services, blockchain infrastructure, and data indexing layers. Expectations: - 6‑month internship with a strong emphasis on rapid learning, autonomous contribution, and active participation in knowledge sharing. - Willingness to self‑train in Scala if not already proficient. Key Responsibilities: - Extend the in‑house JsonRPC reverse proxy (websocket support, session stickiness, etc.). - Deliver high‑quality software: write tests, documentation, and demonstrate functionality. - Perform benchmarks to identify bottlenecks and optimize overall performance. - Implement introspectability (web UI) and publish metrics for system monitoring. Required Skills: - Solid experience with Linux operating systems. - Proficiency in continuous integration / continuous deployment pipelines. - Knowledge of containerization (Docker, Kubernetes) and cloud deployment best practices. - Ability to work autonomously, take initiative, and self‑train in new technologies. - Strong teamwork, communication, and teaching skills (mentoring, meet‑ups, hackathons). - Interest in cryptocurrencies and blockchain technology is a plus. - Familiarity with Scala preferred but not mandatory. Required Education & Certifications: - Current enrollment or recent graduate in Computer Science, Software Engineering, or related field. - No specific certifications required.

Montpellier, France

Hybrid

12-11-2025

Company Name

Ledger

Job Title

Firmware Engineer - Internship

Job Description

Job title: Firmware Engineer – Internship Role Summary: Design and develop a device‑agnostic firmware layer for the Ledger Vault SaaS platform, enabling support for Ledger Stax, Flex, and Nano Gen hardware wallets. Work on multi‑device integration, CI automation, and documentation. Expactations: - Complete a 6‑month internship focused on firmware architecture for cross‑device support. - Deliver design documents, project plans, and coding deliverables meeting quality standards. - Collaborate with software, security, and hardware teams to integrate firmware with the Vault application. Key Responsibilities: - Build and extend firmware components to support multiple Ledger devices. - Analyze current Vault‑Ledger Stax interactions and identify integration points. - Design device‑agnostic interfaces and APIs for the Vault app. - Plan and schedule the multi‑device support project, including milestones and deliverables. - Write unit, integration, and automated CI tests (using Ragger or equivalent). - Maintain clear coding guidelines, documentation, and peer reviews. - Participate in code reviews and contribute to continuous improvement of the firmware stack. Required Skills: - Proficiency in Embedded C and Rust programming languages. - Solid understanding of embedded systems architecture. - Fundamentals of cryptography and secure coding practices. - Experience with continuous integration pipelines (CI) and test automation. - Strong analytical and problem‑solving ability. - Effective written and verbal communication in English. Required Education & Certifications: - Current enrollment in or completion of a degree in Computer Science, Computer Engineering, Electrical Engineering, or a related STEM field. ---

Paris, France

Hybrid

12-11-2025

Company Name

Ledger

Job Title

Software Engineer Design System - Internship

Job Description

**Job Title**: Software Engineer Design System – Internship **Role Summary** Build and maintain Ledger’s cross‑platform design system using React and React Native, ensuring consistency, accessibility, and performance across web and mobile products. **Expectations** * Full‑time, 6‑month internship. * Demonstrate proactive collaboration with designers and developers. * Deliver maintainable, well‑tested UI components and documentation. **Key Responsibilities** * Develop and evolve UI component library in React/React Native. * Translate Figma designs into reusable components. * Establish and maintain design tokens and theming framework. * Define best practices, coding standards, and component documentation. * Ensure accessibility compliance (WCAG) and performance optimization. * Mentor peers, conduct code reviews, and contribute to team growth. * Collaborate with core Design Language System team on roadmap and feature prioritization. **Required Skills** * Proficient in HTML, CSS, JavaScript (ES6+). * Strong experience with React (web) and React Native (mobile). * Familiarity with version control (Git). * Experience with component testing frameworks (e.g., Jest, React Testing Library). * Ability to work with Figma and translate designs into code. * Understanding of responsive and adaptive design principles. * Knowledge of accessibility standards (a11y). * Excellent written and verbal communication. **Required Education & Certifications** * Current enrollment (Bachelor’s, Master’s, or PhD) in Computer Science, Data Science, Statistics, or a related field.

Paris, France

Hybrid

25-11-2025

Company Name

Ledger

Job Title

Software Security Engineer - Internship

Job Description

Job Title Software Security Engineer – Internship Role Summary An entry‑level security engineering internship focused on developing and enhancing automated static and dynamic security analysis tools for Ledger’s embedded cryptocurrency applications. Expactations • 6‑month full‑time internship, intensive hands‑on experience in embedded security. • Exposure to fuzzing, symbolic execution, abstract interpretation, and emerging LLM techniques. Key Responsibilities - Research, implement, and benchmark fuzzing, static analysis, and symbolic execution techniques tailored to embedded crypto firmware. - Extend and refine existing security tools, designing new fuzzing harnesses and improving existing ones. - Integrate security tooling into CI/CD pipelines for continuous assessment of production code. - Participate in security reviews of new embedded features, providing actionable feedback. - Document findings, prepare internal reports, and present results to engineering teams. Required Skills - Proficiency in C, with deep understanding of memory corruption and undefined behaviour. - Practical knowledge of automated security analysis: fuzzing, abstract‑interpretation‑based static analysis, symbolic execution. - Familiarity with exploitation methods and mitigation strategies. - Basic knowledge of large language models (LLMs) and curiosity about their application to security automation. - Working command of Git and version control workflows. - Clear written and verbal communication in English. Required Education & Certifications - Current enrollment or recent completion of a Bachelor’s or Master’s degree in Computer Science, Software Engineering, or a related field focusing on security or embedded systems. ---

Paris, France

Hybrid

27-11-2025