Lead Frontend Engineer

28 September 2023

Job Description

Help us build the leading wallet infrastructure for the multi-trillion-dollar digital asset industry. 

Dfns is a cybersecurity company providing crypto wallet infrastructure. Founded in August 2020 in Paris, Dfns was incubated by Techstars and STATION F before becoming a SOC-2 certified firm audited by Deloitte, employing 30 people across 6 countries and raising over $20M since creation with investors such as White Star Capital, Susquehanna, Coinbase, ABN AMRO, Hashed, 6MV, Semantic, Bpifrance, Figment, SGH, Wintermute, Motier, and more.

Dfns develops the most secure wallet-as-a-service infrastructure in Web3. It’s an API-first wallet management system, ideal for applications and organizations seeking to provide secure access to all blockchains through a single integration. Our APIs and SDKs were designed for wallet programmability and efficient implementations, enabling fast deployments, smart automation flows, as well as granular sets of permissions and policies via secure authentication credentials. 

Dfns is trusted by industry leaders such as Diageo, Warner Bros, Shopify, Casino, Lacoste, Breitling, Accor, FNAC, ABN AMRO, Fidelity, Ingenico, The Sandbox, Atari, Panerai, IWC, Richemont, Ba&sh, YSL, Belgium Government, Seychelles Government, London Metropolitan Police, Rihanna, Harry Styles, Justin Bieber, The Weeknd, David Guetta and more.

Help us build the leading wallet infrastructure for the multi-trillion-dollar digital asset industry. Join exceptional leaders (CTO, CPO, Chief Scientist) and experts (Platform Engineers, Security Engineers, Cryptographers, Protocol Designers) in a dynamic, collaborative environment. We’re looking for a skilled Lead Frontend Engineer with UI expertise, a keen eye for detail, and the ability to thrive in high-pressure situations within our engineering team.

As a Lead Frontend Engineer, you will create and implement functional user-facing software solutions. You will collaborate with upper management to define software requirements and lead operational and technical projects. You will oversee significant sub-departmental projects, relying on strong organizational and problem-solving abilities. You will also drive software change and release management processes to enhance the overall SDLC maturity. Ultimately, your goal is to ensure that software deliverables meet quality standards, adhere to timelines, and prioritize security.


Your main objective is to create, test, and maintain top-notch software that aligns with customer requirements and business objectives.

Your daily tasks will involve:

  • Contributing to Agile Scrum, ensuring deadlines and production quality.
  • Spearheading creative solutions for frontend and UI related challenges.
  • Leading UI development for our wallet-as-a-service platform.
  • Ensuring secure and user-friendly passkey-based authentication.
  • Developing and maintaining SDKs for seamless client integration.
  • Implementing robust error handling and real-time notifications for users.
  • Building secure audit logging for user actions and fund transfer features.
  • Continuously improving UX for authentication, logging, and transfers.
  • Designing and maintaining fast authentication widgets and intuitive UIs.
  • Ensuring security best practices for frontend components and staying updated on security trends and vulnerabilities in frontend development.
  • Maintaining clear and concise technical documentation.
  • Optimizing frontend performance for speed and responsiveness.
  • Evaluating product code against specifications and gathering requirements.
  • Swiftly addressing problems and documenting all reported issues and actions taken.
  • Enhancing customer satisfaction through technical support.
  • Creating and updating internal and external documentation.
  • Collaborating with cross-functional teams to improve software development practices.
  • Staying updated on emerging technologies and suggesting improvements.
  • Participating in client meetings to assess our solution compared to market alternatives.

Preferred Experience 

  • 6+ years as a Frontend Engineer.
  • Proficient in Typescript programming (or equivalent).
  • Mastery of React, Angular, and/or Vue.js for UI development.
  • Knowledge of WebAuthn and passkey-based authentication.
  • Experience creating and maintaining multiple SDKs.
  • Strong error handling, real-time notifications and debugging skills.
  • Knowledge of secure audit logging and financial UIs practices.
  • Understanding of cybersecurity principles.
  • Proficient in Git version controls.
  • Ability to create responsive and mobile-friendly UIs.
  • Experience with multi-language support in UI development. 
  • Knowledge of web accessibility standards (WCAG).
  • Proficiency in frontend testing tools and practices. 
  • Dedication to delivering a user-centric experience.
  • Ability to create rapid prototypes for UI concepts.
  • Strong problem-solving skills and ability to champion ideas.
  • Clear communication and clear thinking under high-pressure.
  • Entrepreneurial mindset with a professional demeanor.
  • [Bonus] Experience in developer tools, cybersecurity, or blockchain.
  • [Bonus] In-depth understanding of crypto wallets and their use cases.