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deltas-lee/README.md
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πŸ“ South Africa Β Β·Β  🏒 LexisNexis France Β Β·Β  πŸ’Ό 5+ years shipping production software

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πŸ‘¨πŸ½β€πŸ’» About

Staff-level frontend engineer focused on design systems, performance architecture, and accessibility at scale β€” currently leading frontend architecture at LexisNexis France, where I drive migration from legacy Windows Form monoliths to a modern Angular and React/Next.js stack.

Core areas of depth: component library design, Core Web Vitals optimization, WCAG 2.1 AA compliance, and developer tooling. I regularly mentor mid-level engineers through code review and architecture decisions.

  • πŸ”­ Current: Full-stack Development & design systems at LexisNexis France
  • 🌱 Exploring: Microfrontend composition, AI-augmented UI patterns, and .Net Microservices
  • 🀝 Seeking: Senior/Staff Frontend roles where I can own technical direction and platform decisions

πŸ›  Core Stack

Frontend

TypeScript JavaScript React Next.js Angular Tailwind CSS HTML5 CSS3

Tooling & Testing

Vite Storybook Jest Figma Git GitHub Actions

Backend & Platform (I work full-stack when needed)

.NET Node.js Flutter PostgreSQL Docker Azure


πŸ’Ό Experience

Software Engineer Β· LexisNexis β€” France (Remote) Β· Feb 2023 – Present

  • Works on legal research products serving thousands of daily professional users.
  • Architected a shared Angular + TypeScript component library and Storybook design system, cutting feature delivery time by ~30% across squads.
  • Drove the incremental migration of legacy WindowsForm modules to a modern Angular stack, improving Largest Contentful Paint by ~40%.
  • Champion accessibility (WCAG 2.1 AA) and Core Web Vitals as first-class engineering metrics; mentor mid-level engineers in code review and frontend best practices.
  • Stack: Angular, React, Next.js, TypeScript, Tailwind CSS, Storybook, .NET APIs, Azure

Flutter Developer Β· Mzansi WebApps β€” South Africa Β· Jan 2021 – present

  • Built responsive, data-heavy dashboards in React and Next.js for fintech and enterprise clients.
  • Introduced Jest and component-level testing to a previously untested codebase, raising coverage from ~10% to 75%.
  • Collaborated closely with designers in Figma to ship pixel-accurate, reusable UI components.
  • Stack: React, Angular, TypeScript, TailwindCSS, SCSS, Node.js, Flutter, and Dart

Software Developer Β· AOLC β€” South Africa Β· Jan 2021 – Feb 2022

  • Delivered internal-facing web-apps and systems end to end in a fast-paced startup environment.
  • Implemented CI/CD pipelines with GitHub Actions, reducing manual release effort and deployment errors.
  • Stack: C# .NET, Blazor, APSNET MVC, SQL, Restful API, Git & GitHub

Open to senior frontend opportunities β€” see my LinkedIn for the full history.


πŸš€ Featured Projects

An AI-powered support chatbot built with Next.js and modern LLM integrations β€” focused on a calm, accessible conversational UI.

Next.js TypeScript AI

A pixel-faithful banking app rebuilt from scratch in Flutter to showcase UI engineering, state management, and mobile design fidelity.

Flutter Dart

πŸ“Œ More projects live in my pinned repositories below.


πŸ—οΈ Key Impact

WindowsForm β†’ Angular+TypeScript migration β€” Led the incremental migration of a legacy WindowsForm monolith to modern Angular app at LexisNexis. Solved framework coexistence via a microfrontend shell routing by path prefix, enabling squad-by-squad adoption without downtime. Result: 40% improvement in LCP and 30% faster feature delivery.

Design system architecture β€” Built a shared Angular + TypeScript component library (Storybook, Chromatic visual regression, strict generic APIs) serving 4 squads. Cut UI development time by ~30% and enforced consistent UX across legal research products serving thousands of daily professional users.

Testing culture shift β€” Introduced Cypress + Angular Testing Library to an untested codebase, scaling coverage from ~10% to 75% in 6 months using risk-prioritized testing rather than blanket coverage mandates.


πŸ’¬ Seeking a Senior/Staff Frontend role where I can own architecture, design systems, and frontend platform decisions.

deltaslep@gmail.com

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Pinned Loading

  1. Storefront Storefront Public

    A modern, feature-rich e-commerce storefront built with Angular 19, showcasing best practices in state management, routing, and user experience design.

    TypeScript 1 4

  2. Address-Book-App Address-Book-App Public

    A full-stack Address Book application built with Angular frontend and .NET Web API backend, featuring contact management with cRud operation, Entity Framework Core with SQLite database, and compreh…

    C#

  3. FlagExplorerApp FlagExplorerApp Public

    Flag Explorer is a web application designed to provide users with detailed information about countries around the world. The app fetches data from an open API and displays it in an intuitive and us…

    C#

  4. Employee-Management-System Employee-Management-System Public

    ASP.NET CORE MVC PROJECT

    C# 1

  5. Capitec-App-Clone Capitec-App-Clone Public

    A Capitec Bank app clone built from scratch to demonstrate my mobile app development skills, including UI design, navigation, and core functionality implementation.

    Dart 3

  6. eCommerce--Admin-Dashboard eCommerce--Admin-Dashboard Public

    A responsive e-commerce admin dashboard built with Angular, featuring user authentication and product management functionality. Uses FakestoreAPI for mock product data.

    TypeScript 1