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

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

Company Name

Ledger

Job Title

Applied Cryptography - Internship

Job Description

**Job Title** Applied Cryptography – Internship **Role Summary** Engage in a 6‑month internship assessing the feasibility of running zero‑knowledge succinct proof verification on Ledger’s Secure Element (SE). Tasks include selecting a suitable open‑source proof system, implementing and benchmarking verification logic on constrained SE hardware, and proposing optimizations tailored to SE constraints. **Expectations** - Complete the internship within 6 months. - Deliver a written report on selected proof system(s), benchmark results, and optimization recommendations. - Demonstrate the ability to prototype on SE hardware and evaluate performance against defined use cases. **Key Responsibilities** - Compare and evaluate open‑source zk‑proof systems (e.g., RISC Zero, SP1, StarkWare STwo prover, Nexus zkVM) for SE suitability. - Implement proof verification logic on SE prototypes using appropriate languages (C/C++/Rust). - Benchmark verification performance across standard use cases, measuring CPU cycles, memory usage, and latency. - Identify and prototype optimizations to reduce resource consumption on the SE. - Prepare concise documentation and present findings to the Security evaluation and research team. **Required Skills** - Strong foundational knowledge in cryptography (public‑key, hash functions, zero‑knowledge concepts). - Familiarity with zero‑knowledge succinct proof systems (SNARKs, STARKs, zkVM). - Proficiency in a systems programming language (C, C++, or Rust). - Experience with embedded development and understanding of low‑resource constraints. - Analytical mindset for performance measurement and data analysis. - Ability to read academic literature and open‑source codebases. **Required Education & Certifications** - Current enrollment or completion of a Bachelor’s or Master’s degree in Computer Science, Electrical Engineering, or a related field. - Coursework or projects covering cryptography, formal methods, or embedded systems. *(No company details, location, benefits, or fluff included.)*

Paris, France

Hybrid

30-11-2025

Company Name

Ledger

Job Title

Software Engineer - Wallet Experience - Internship

Job Description

**Job Title** Software Engineer – Wallet Experience (Internship) **Role Summary** Front‑end software engineering internship focused on the desktop (Electron) and mobile (React Native) Ledger Wallet applications, delivering core features, maintaining code quality, and contributing to the open‑source monorepo ledger‑live. **Expectations** - 6‑month internship with full ownership of feature development - Deliver high‑quality, testable code following best practices - Collaborate closely with developers, QA, designers, and product managers **Key Responsibilities** - Own the technical development of Ledger Wallet for desktop and mobile platforms. - Design, implement, and test new features using React.js, TypeScript, and JavaScript. - Write unit, integration, and end‑to‑end tests (Jest, React Testing Library, Cypress). - Participate in code reviews and ensure adherence to UI/UX framework standards. - Maintain and evolve a shared component library within the ledger‑live monorepo. - Contribute to open‑source projects and share knowledge across teams. - Collaborate with cross‑functional teams (devs, QA, designers, product) to define technical solutions. **Required Skills** - Proficiency in JavaScript and TypeScript. - Strong experience with React.js (hooks, context, performance optimization). - Familiarity with Electron and/or React Native (preferred). - Solid understanding of testing strategies (unit to e2e). - Knowledge of UI/UX best practices in software development. - Ability to write clean, maintainable, scalable code. - Excellent collaboration, communication, and problem‑solving skills. **Required Education & Certifications** - Current student or recent graduate in Computer Science, Software Engineering, or a related field. - Practical experience or coursework in web3/blockchain technologies is a plus but not mandatory.

Montpellier, France

Hybrid

09-12-2025