Sarah Tully | Senior Systems Tech Lead

About

Building with intention & craft

With 15 years of experience, I deliver enterprise applications across modern web technologies and the native Apple ecosystem, including iOS, iPadOS, macOS, watchOS, and visionOS, as well as hybrid mobile apps for iOS and Android.

I combine technical depth with strong UX instincts to build scalable, high-performance solutions. From front-end architecture and performance optimization to cross-platform development, I bring a holistic perspective to every project.

Currently leading a cross-functional team of engineers at Orthogonal, setting technical direction for Software as a Medical Device (SaMD) from architecture through delivery.

Expertise

What I bring

Full-Stack & Web

Angular, React, TypeScript, Node.js, NestJS, HTML5, CSS3/SCSS. Building responsive, accessible, component-driven interfaces.

Native & Mobile

Swift, SwiftUI, React Native, Expo. From iOS and visionOS to cross-platform apps with native-quality experiences.

IoT & Real-Time

Bluetooth/BLE, WebRTC, WebSockets, push notifications. Connecting devices and enabling real-time communication.

Architecture & Leadership

System design, C4 diagrams, SDLC ownership, team mentorship. Leading teams of 11+ engineers from concept to delivery.

Healthcare & Compliance

HIPAA-compliant apps, PHI handling, SaMD, FHIR/EMR integration, HealthKit. Regulated software done right.

AI & Innovation

AI coding agents, LLM-assisted tooling, MCP servers, OpenAI APIs. Integrating AI to accelerate workflows and delivery.

Tech Stack

React TypeScript JavaScript Angular Swift SwiftUI React Native Node.js iOS HTML5 CSS3 / SCSS NestJS Expo / Electron / Cordova Reactive Architecture CI/CD Git WebRTC WebSockets Bluetooth / BLE AI/ML visionOS MCPs Design frameworks

Experience

Where I've been

2025 - Present

Senior Software Engineer II, Tech Lead

Orthogonal

Leading a cross-functional team of engineers building SaMD across mobile, web, backend, and IoT. Setting technical direction from architecture through delivery in a regulated healthcare environment.

2013 - 2025

Senior Systems Tech Lead

Lextech

Led enterprise application development across the Apple ecosystem and modern web for Healthcare, Aviation, and Manufacturing. Early visionOS developer. Built HIPAA-compliant healthcare apps and internationalized applications.

2021 - 2022

Systems Tech Lead

LexGo

Led development of a virtual collaboration platform with WebRTC and WebSocket-based real-time communication across native iOS and web/desktop.

2012 - 2013

Web Developer & UX/UI Designer

WarmlyYours

Designed and developed a custom, responsive e-commerce platform using HTML5, Sass, JavaScript, and Bootstrap. Improved site performance, SEO, and user experience.

2011 - 2012

Web Developer & Graphic Designer

JMS Marketing, Inc

Designed and built custom websites using HTML, CSS, PHP, and JavaScript, focusing on responsive design and UX. Maintained brand consistency and usability.

Connect

Let's work together

Have a project in mind or want to chat about tech?

Based in Illinois · Working remotely