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Patrick Pijnappel
Verified Expert in Engineering
Software Developer
Melbourne, Victoria, Australia
Toptal member since February 10, 2016
Bio
Patrick has been deeply passionate about programming since the age of 12. He is a longtime freelancer, co-founder of Archimedes, and a contributor to experimental AI research and the Swift language itself. He thrives on the really hard problems, clean architecture and advanced performance optimization. He has coded in over a dozen different languages and can pick up new languages and technologies very quickly.
Portfolio
Archimedes Calculator
iOS, Objective-C, Swift
Huddle
AVFoundation, Node.js, Swift
DKP Veterinary Clinic
iOS, Swift, Objective-C, Arduino, C++
Experience
- iOS - 8 years
- Objective-C - 5 years
- Swift - 5 years
- Java - 4 years
- C - 4 years
- C# - 4 years
- Arduino - 4 years
- Node.js - 2 years
Work Experience
Co-founder
2011 - 2018
Archimedes Calculator
- Designed and developed Archimedes, a next-generation graphing calculator for iOS.
- Created a unique, fully-interactive mathematical typesetting system with fluid animation.
- Wrote a custom symbolic math solving engine with automatic unit handling.
- Implemented high-quality plotting functionality including smooth touch-based scroll/zoom, automatic POI detection, and direct-interaction tracing, differentiation, and integration tools.
- Began developing an advanced experimental new type of symbolic math engine.
Technologies: iOS, Objective-C, Swift
Co-founder
2016 - 2017
Huddle
- Developed a location-based video sharing platform.
- Figured out a way to have a performant feed of up to 16 simultaneously playing streaming video tiles.
- Wrote frameworks for declarative endpoint specification, futures/promises, model parsing, model persistence, and change notification.
Technologies: AVFoundation, Node.js, Swift
Arduino/iOS Developer
2011 - 2017
DKP Veterinary Clinic
- Created the software for a wifi-enabled advanced experimental operating table with Arduino-controlled electronics and an iPad interface.
- Created the software for an experimental network of veterinary animal cells with lighting, heating, ventilation, and oxygen supply systems controlled by a distributed set of Arduinos communicating with an iPad interface.
- Wrote a robust communication layer between a network of Arduinos and iOS devices using a simultaneous mixture of serial, I2C, and wifi channels.
- Interfaced with a large number of different analog and digital sensors and actuators over a variety of different protocols.
- Created a messaging system for generically binding sensors and settings on Arduinos to properties on iOS devices, automatically managing communication over a mixed channel network.
Technologies: iOS, Swift, Objective-C, Arduino, C++
iOS Developer
2015 - 2016
Péritus
- Created an iOS front-end app for a dynamic CRM application.
- Wrote encapsulation for communication with a legacy REST back-end with consistent error handling.
- Created dynamic UI for display and manipulation of records with arbitrary fields of different data types.
- Created a self-contained encapsulation of a complex workaround for broken call tracking API.
- Created dynamically fetching browse and search functionality for working with large record sets.
Technologies: iOS, Swift
Java Developer
2011 - 2011
DelftTech
- Developed the third version of a leading forensics application for the measurement of suspects by joining camera images with point cloud data from 3D laser scans of the crime scene.
- Completely transformed a large, undocumented old codebase into a clean, stable, and organized one.
- Wrote code for 3D navigation, rendering, and manipulation using OpenGL.
- Wrote code to load, manipulate, and render large datasets in a performant way.
- Redesigned, localized, and generally modernized the UI.
Technologies: OpenGL, C, Java
Project History
Swift Standard Library
https://github.com/apple/swift/pulls?q=is%3Apr%20author%3APatrickPijnappell've been one of the top non-Apple contributors to the Swift language and standard library since it became open-source. I primarily do performance optimization, rewrites, and spotting of edge cases in the standard library. Some of the more interesting ones include https://github.com/apple/swift/pull/1477 and https://github.com/apple/swift/pull/1525.
Archimedes
A next-generation scientific calculator with custom smoothly animated mathematical typesetting, lots of custom UI, and a custom symbolic math engine underneath.
Machino
https://github.com/PatrickPijnappel/MachinoGraduation project on an OS X application for the design of Arduino programs using finite state machines, including live runtime visualization of the executing Arduino code (Objective-C).
Education
2011 - 2013
Master's (with Honors) Degree in Design for Interaction
Delft University of Technology - Delft, The Netherlands
2007 - 2010
Bachelor's Degree in Aerospace Engineering
Delft University of Technology - Delft, The Netherlands
Skills
Libraries/APIs
OpenGL, GNU Multiple Precision (GMP), Node.js, XNA
Tools
Xcode, Git, Adobe Photoshop, Adobe Illustrator
Languages
Objective-C, Swift, Java, C, C#, Python, JavaScript, CSS, HTML, C++
Frameworks
Cocoa Touch, Windows Presentation Foundation (WPF), Cocoa, .NET, Express.js
Platforms
iOS, Arduino, MacOS
Storage
MongoDB
Other
Computer Graphics, AVFoundation
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