William D.

• Designed and implemented “Uno”, an AI-powered workflow & automation system (LangChain + internal tools) with a live chat interface, improving support efficiency and reducing manual interventions. • Integrated Uno into Plain (support tool), enabling both conversational and one-shot assistance for the support team. • Built self-service MDM features to deploy and initialize Fleet instances directly from Primo, removing the need for developer intervention. • Optimized the monorepo with Nx and migrated the frontend build to Vite, significantly improving build times and DX. • Delivered advanced device views (filters, export, health checks, AI-powered filters) and expanded the catalog with geographical zones (US / UK). • Ensured robust data flows and consistency with a core label sync mechanism between Fleet and Primo. Stack: Node.js, NestJS, GraphQL, TypeScript, React, Nx, Vite, MongoDB, Jest, vite-test, Datadog, Github.

• Led a team of 6 engineers while staying hands-on on the codebase (React / TypeScript / NestJS / PostgreSQL). • Owned the delivery pipeline end-to-end: from roadmap definition with Product to shipping features in production. • Built and rolled out a Design System and a shared component library to speed up delivery and align UX across the app. • Migrated the codebase to a monorepo, extracted shared libraries (business logic, types) and improved DX and maintainability. • Strengthened CI/CD with GitHub Actions, background processing with Bull, and observability with Datadog. • Instrumented the product with Posthog to make UX and product decisions based on real user behavior. • Actively contributed to hiring (engineers, PM, QA, CTO): screening, technical interviews, and leveling. Stack: NestJS (Node.js), PostgreSQL, React, TypeScript, Heroku, Bull, Posthog, GitHub Actions (CI), Datadog, vite, Jest.

• Joined as a founding engineer, working closely with the founders to design and build the first versions of the product. • Developed a desktop application with Electron, React and TypeScript, handling core flows end-to-end (UI, state management, data fetching). • Implemented the frontend architecture with React, Redux and React Query, ensuring a responsive and robust user experience. • Built and maintained backend services with NestJS and MongoDB, including API design and data modelling. • Set up error monitoring with Sentry and contributed to a consistent UI through Styled Components and shared components. • Helped define technical choices, coding standards and best practices as one of the first engineers on the team. Stack: Electron, TypeScript, React, Redux, React Query, NestJS, MongoDB, Styled Components, Sentry.

• Worked as a freelancer embedded in a product team to build and evolve a claims management portal on top of a .NET backend ecosystem. • Developed and maintained the React (TypeScript) frontend in a .NET environment, collaborating closely with backend engineers, designers and product managers. • Co-led the creation of a Design System to standardize UI components across products, improve consistency and speed up delivery. • Helped define design and implementation guidelines, and supported teams adopting the Design System through documentation, examples and pairing. • Built a generic E2E testing framework (Jest + Puppeteer) to cover critical business flows and reduce regressions in production. Stack: React, TypeScript, .NET ecosystem, Styled Components, Storybook, Jest, Puppeteer.

• Worked on browser extensions, web app and admin console, in a high-security, privacy-first environment. • Built and maintained features in a large React / Redux / TypeScript codebase used by millions of users. • Contributed to projects around zero-knowledge cryptography, secure data flows and performance-sensitive UI in the browser. • Designed and maintained cross-browser E2E tests and CI pipelines for extensions, improving reliability and confidence in releases. • Helped refactor parts of the codebase from OOP to more functional, testable patterns, improving maintainability over time. • Collaborated daily with international teams (Product, Design, Security, Support) to ship features aligned with business and user needs. Stack: React, Redux, TypeScript, JavaScript (ES6+), WebExtensions, Jest, CI tools. Patent: https://www.dashlane.com/blog/master-password-remember-me

• Worked on sports betting, horse racing and casino products in a highly regulated environment. • Contributed to features for compliance and R&D teams, ensuring legal and regulatory requirements were met while keeping a good UX. • Implemented and maintained backend and frontend features across several domains, collaborating with product, QA and ops. • Took part in security-focused initiatives and the company’s agile transformation (frequent releases, iterative delivery). Stack: C#, .NET, ASP.NET (MVC), SQL Server, JavaScript, Git, Scrum.