Junior Software Engineer - Frontend

About Dashlane Dashlane’s mission is to deliver the credential security every business and employee needs to thrive. Millions of consumers, and over 25,000 brands worldwide, such as Michelin, Air France, and Forrester, trust Dashlane for industry-leading innovations, patented zero-knowledge security, and an unmatched user experience. Founded in Paris, Dashlane has since established offices in New York and Lisbon, and has grown to more than 300 Dashlaners globally. We're looking for people who actively use AI tools to drive efficiency, creativity, and impact in their work. At Dashlane, we drive innovation and value learning, strive for excellence in everything we do, and thrive as one team. Learn more about life at Dashlane , including how we work , how we hire , and the benefits of being a Dashlaner . About the role You will join the Analysis and Contextual Experience team, which is responsible for the autofill engine and proactive security features at the core of the in-browser product experience. Our goal is to improve the online browsing experience of our users, leveraging cutting-edge technology to help them access services more quickly and easily while keeping them safer online. This encompasses ML-based webpage analysis for autofill and phishing detection, as well as in-browser nudges and alerts that guide the user to stronger credential security habits. As a junior web software engineer, you will contribute to developing the Dashlane browser extension by building and integrating our innovative solutions in a smooth in-browser user experience. You will combine frontend expertise with a forward-thinking AI mindset, integrating GenAI tools throughout the SDLC to accelerate development velocity while working in a deeply collaborative team to secure millions of digital identities. Location-Specific Information: You will be based in Paris, with a hybrid policy (3 office days / week) and English as your working language. At Dashlane, we embrace a hybrid culture that combines the best of both worlds: the creativity and energy of in-person collaboration with the flexibility of remote work. Our model is designed to strengthen team connections while supporting individual productivity and work-life balance. To maximize collaboration, we come together in the office on Mondays, Tuesdays, and Thursdays, while Wednesdays and Fridays offer more flexibility for focused work. Our stack: Programming language: Typescript, Javascript, React, RxJS Browser extension: Manifest V3 (Chromium), Firefox, Safari — content scripts, service workers, Shadow DOM, cross-frame messaging Quality: Sonarqube, ESLint Testing: Jest, Vitest, WebdriverIO (Selenium e2e) Build: Rspack, Webpack, Nx (monorepo) Versioning: Gitlab Monitoring: ELK, Omni Documentation and tooling: Confluence, Zoom, Slack Misc: Gitlab CI, PNPM AI : Claude Code In your role, you will: Work deep in the browser-extension stack : content scripts, service workers, Manifest V3 APIs, isolated worlds, and iframe hierarchies. Strengthen security features such as anti-phishing / phishing resistance , and help explore new privacy layers (e.g. data-loss prevention for AI tools). Building and integrating innovative features based on local analysis of in-browser context using state of the art solutions including custom trained models and genAI models Implement projects end-to-end: write clean code, easy to maintain and understand, implement tests, and manage deployment. You will lean on AI coding platforms like Claude Code to streamline this lifecycle, driving development velocity while maintaining high code quality. Act as an AI Pioneer within the engineering organization, demonstrating proven experience integrating modern GenAI tooling into day-to-day workflows. Learn every day, and share your knowledge with your co-workers. Requirements: 2+ years of experience in software development 2+ years of experience with JavaScript or TypeScript development 1+ years of experience with frameworks such as Reac