Available for senior roles · Remote / Los Angeles

Emmanuel De Freitas

Senior Software Engineer Frontend & AI Product Engineering

I build fast, accessible products at the seam of interface and intelligence — React/TypeScript on the front, Node and cloud on the back, and LLM-driven features woven through. A decade shipping web, mobile, and design systems for teams from startups to the Big Four.

Get in touch
10+
Years shipping
4
Platforms · web · Expo · desktop
20+
Products delivered
TS·AI
Core focus
01 — Profile

A generalist who ships, with a specialist's obsession for the interface.

Senior engineer with 10+ years across React, React Native, and native iOS, now focused on AI-driven product experiences. I turn ambiguous problems into shipped, accessible interfaces — owning the work from design system to deployment, and mentoring the teams that keep it alive.

Frontend architecture AI / LLM integration React & React Native Design systems Accessibility (a11y) Cloud & CI/CD
02 — Experience

Where I've shipped.

Selected roles from a decade of engineering across startups, healthcare, civic tech, and enterprise consulting.

Jun 2025 — Mar 2026 The Motley Fool Contract · Remote

React Native Engineer

  • Implemented GraphQL queries for a mobile gateway API — secure authorization and authentication with a measurable reduction in response errors.
  • Incrementally upgraded the mobile app to Expo 54, following an AI-suggested migration plan to the newest dependencies while avoiding regressions.
  • Used GitHub Copilot automated code review and agentic workflows to multiply a small team's QA, testing, and review effort.
  • Plan quarterly stakeholder meetings estimating new feature work alongside bug fixes and tech debt.
  • Mentored junior engineers on React Hooks patterns and TypeScript typings during code reviews.
Apr 2025 — Aug 2025 High Fidelity Sr. Front End Engineer

Sr. Front End Engineer

  • Developed a WebRTC MVP using Svelte, enhancing real-time user interaction and collaboration.
  • Built a reactive Svelte + TypeScript component library for consistent UI across modules, refactoring legacy code along the way.
  • Optimized web performance with Pixi.js — lazy-loading canvas scenes to cut initial page load, CPU usage, and memory.
  • Implemented automated testing with Playwright, ensuring robust application reliability.
Feb 2025 — May 2025 PwC Full Stack Developer

Full Stack Developer

  • Worked on a new AI automation initiative for an insurance and company-policy web application.
  • Collaborated with international teams on a React + .NET stack, achieving seamless integration and improved code reusability.
  • Implemented AI automation features, leading to measurable improvements in processing time and user satisfaction.
  • Proposed and developed POC design strategies, enabling future extensibility across development teams.
Nov 2024 — Feb 2025 CurbsideSOS Senior Software Engineer

Senior Software Engineer

  • Led a React Native rewrite that lifted the App Store rating from 3.8 to 4.7 and crash-free sessions to 99.5%.
  • Cut cold-start time ~45% through bundle splitting and native-module optimization.
  • Built a live dispatch dashboard in React + D3.js visualizing 1k+ concurrent roadside requests.
  • Increased unit test coverage to 80%, and submitted engineering RFCs that guided debt-reduction efforts.
  • Developed a Kotlin Multiplatform proof-of-concept to validate cross-platform code sharing.
Feb 2022 — Oct 2024 OpSource · UtiliSource React · React Native

React Native Developer

Aug 2024 — Oct 2024
  • Built a React Native mobile app to match web features, improving cross-platform consistency and user retention.
  • Organized the codebase into atomic components to standardize structure for future collaborators.
  • Defined the MVP feature set with stakeholders and implemented agile practices that accelerated delivery.

React Developer

Apr 2024 — Jul 2024
  • Developed an MVP React web application with a custom form builder and renderer, mapping, and real-time updates.
  • Iterated on features based on tester and stakeholder feedback to enhance user experience.

Senior Software Engineer

Feb 2022 — Mar 2024
  • Developed React and React Native web and mobile apps, backed by a .NET / C# solution providing REST API endpoints.
  • Integrated Jest and Cypress end-to-end tests, ensuring robust coverage and a seamless development pipeline.
  • Delivered GIS mapping and equipment-inventory features to satisfy stakeholder requirements.
  • Collaborated with UI/UX designers on responsive, user-friendly interfaces.
Jul 2024 — Sep 2024 Better in person iOS Developer

iOS Developer

  • Developed new iOS app features with SwiftUI to enhance the user experience.
  • Resolved bugs reported by TestFlight users promptly to keep the app stable.
  • Designed and implemented intuitive interfaces from provided designs, integrating third-party libraries and APIs such as social media and payment gateways.
Feb 2024 — Apr 2024 City Beauty Angular Developer

Angular Developer

  • Developed and designed landing pages in PHP, CSS, and JavaScript using HTMX.
  • Updated and maintained cart pages with Angular 12+ components, with router guards protecting checkout and account routes.
  • Optimized lazy-loaded feature modules to cut initial bundle size and improve first-contentful paint.
Jan 2021 — Sep 2023 Viulogix Mobile · Full Stack

React Native Developer

May 2023 — Sep 2023
  • Designed and developed an industry-scale rental mobile application with React Native, building custom components for complex rental features.
  • Integrated native iOS camera APIs for high-resolution photo capture, mapping, and Firebase Cloud Messaging push notifications.
  • Implemented offline data caching with AsyncStorage to keep the app functional without network.

Software Engineer

Jan 2021 — Apr 2023
  • Built HR and compliance web-app features in Vue.js, Firebase, and .NET to meet product specs.
  • Improved state consistency with Vuex and Pinia, and converted UX hand-offs into a testable form-builder prototype.
  • Built a GitHub Actions CI/CD pipeline automating builds, tests, and staging deploys, and authored end-to-end test cases.
2018 — 2022 Watchtower WHQ Lead · Frontend · UI

Lead Software Engineer

Jun 2021 — Dec 2022
  • Led a cross-functional engineering team delivering scheduled product increments on a quarterly roadmap.
  • Chaired daily stand-ups and weekly sprint reviews under Scrum; maintained and prioritized the product backlog.
  • Produced weekly burn-down and velocity reports exposing sprint bottlenecks, and coached product owners on writing atomic user stories.

Front End Developer

Oct 2019 — Jun 2021
  • Built reusable Storybook UI components in React and Vue.js, reducing duplicate UI code across projects.
  • Maintained unit tests to keep coverage at 80%+, and drove progressive adoption of the design system with UX and product teams.
  • Documented component specifications in the design-system site using Docusaurus, Markdown, and MDX.

UI Developer

Jan 2018 — Sep 2019
  • Created a live pattern demo page and component library with React stories, cutting repeated implementation effort across teams.
  • Conducted user research — card sorting and usability testing — to define clear UX requirements.
  • Designed and prototyped UI components in Figma, validating designs through iterative feedback cycles.
Jul 2015 — Dec 2017 Infinite Communications Sherman Oaks, CA

Principal Software Developer

Dec 2015 — Dec 2017
  • Led development of WordPress-ready PHP themes and plugins, delivering production-ready code for client sites.
  • Built React and Angular web applications for a client management system, improving front-end maintainability.
  • Coordinated with Marketing and Design to align deliverables, creating modular landing-page sections and proven CTAs.

Front End Web Developer

Jul 2015 — Dec 2015
  • Built custom PHP and CSS WordPress plugins and themes that improved dental clients' online engagement.
  • Created React and Angular web apps for patient-management workflows, improving staff user experience.
  • Implemented Google Tag Manager and Google Analytics to measure site performance and drive conversion improvements.
03 — Stack

The toolkit.

Depth in the frontend and product layer, with the full-stack and cloud range to own a feature end-to-end.

Frontend & Mobile

ReactNext.jsReact Native TypeScriptReduxVue.js AngularTailwind CSSSwiftUI iOS · SwiftPWAs

AI / SDD

LLM integrationAI SDKAgentic workflows Agent builderCustom MCPsSpeckit QuantizationPython

Backend & Data

Node.jsExpressGraphQL FastAPIFastMCPPostgreSQL MongoDBFirebaseREST uvPyPI packagingC# · .NET

Cloud & DevOps

AWSAzureGCP DockerCI/CDGitLab CI

Practices

System designDesign systemsTDD Agile · ScrumWeb accessibilityUnit & E2E testing UX lead & researchPerformance tuningCross-functional leadership
04 — Projects

What I'm building now.

Open work in progress — platform tooling and products I'm actively shipping outside of client work.

In active development

A Book Structure API that x-rays any book — chapters, paragraphs, sentences, clauses, words — as counts-only JSON, without ever returning the text itself. Give it a title, ISBN, Gutenberg ID, or your own EPUB: it locates the book via Gutendex, cleans the text, and classifies its structural schema with a confidence rating. A FastAPI REST API and a FastMCP server share one service layer, and a native GPUI desktop client (Rust) renders the structure as an animated tree synced with a JSON editor.

Metabook desktop app searching Pride and Prejudice and exploring its structural schema
PythonFastAPIFastMCP RustGPUIDocker Vercel Blob
In active development

A graph-based study platform for annotated religious texts — Bible, Quran, Tanakh, commentaries, and lexicons. Deep study tools treat text as data: the backend converts EPUB / HTML / PDF / TEI documents into queryable graph corpora where every word, verse, and chapter is a typed node with features like lemma, morphology, and gloss — then serves them to AI assistants through a FastMCP server and a FastAPI conversion pipeline, shipped as uv-workspace packages on PyPI.

PythonTypeScriptFastAPI FastMCPDockerShell Supabase
Live on Homebrew

The terminal front end for the Corpora toolchain — brew install exegia/corpora/cli and any EPUB / PDF / HTML / TEI or plain-text document becomes a single portable .corpus archive the rest of the platform can query. Ships convert, validate, schema, reconcile, and library commands, with a Homebrew formula and a standalone installer built and released through GitHub Actions.

corpora CLI converting an EPUB into a .corpus archive in the terminal
PythonHomebrewShell Text-FabricGitHub Actions
Live on npm

Interactive Spline 3D scenes in React Native — fully native, no WebView. Wraps Spline's official Swift and Android runtimes as an Expo native module with a zero-config plugin: one <SplineView> component renders a GPU-driven scene at 60fps, while useSpline() and useVariable() give JavaScript full scene control — events, camera, and reactive scene variables with React ergonomics. TypeScript-first, published on npm.

TypeScriptReact NativeExpo Modules SwiftKotlinnpm

A modular Swift video-editor SDK for iOS and macOS: multi-track timeline (video, audio, overlays), trim/split and drag reorder, filters and LUTs, transitions, timed text and picture-in-picture overlays, SRT captions, and H.264/H.265 export with progress and cancel. Split into focused SwiftPM modules — a Codable, AVFoundation-free timeline model at the core, an AVFoundation + CoreImage render engine, and drop-in SwiftUI editor components — all modern async/await Swift.

SwiftSwiftUIAVFoundation CoreImageSwiftPM
05 — Foundations

Education & certifications.

Education

Associate Degree, Computer Science
Brevet de Technicien Supérieur · Development — Université Paris Nanterre, France · 2010
Baccalauréat Scientifique
Lycée Georges Braque · Argenteuil, France · 2006
Let's build

Have a hard interface problem?
I like those.

Open to Senior Frontend, Full-Stack, and AI product engineering roles — remote or Los Angeles.

© 2026 Emmanuel De Freitas Built with HTML, CSS & a little JavaScript · No frameworks.