CV Jof Arnold - Senior Engineer, BigHealth.com
Overview
Software engineer since 2006. React.js since 2013. Cofounder of FitFu (YCombinator W11, 250,000 users) and Timecounts.org. Expert with React, React Native, Redux, Redux Saga, TDD, Jest, Enzyme, styled-components, Git. Strong detail-focused UI designer. Also have worked (or regularly work with) with Node.js, Selenium, various ORMs (e.g. Sequelize), D3 (and various related graphing libraries such as Victory, Chart.js), Docker, Flowtype, TypeScript, Arduino, Bluetooth, NFC, C, STM32 ARM Cortext MCUs, UX/UI, user testing, Backbone (3 years experience), CoffeeScript, jQuery, Less. Past clients include startups, NHS, Elsevier, Channel 4, Big Health.
Core Skills
JavaScript (since 2006)
React (since late 2013)
React Native (since April 2018)
Apollo, GraphQL (2 years)
Node.js/Express (2 years)
CSS (since 2006)
Embedded Systems C e.g. STM32 ARM Cortex MCUs (~200 hours)
Java (600 hours)
Professional Experience
Big Health
Freelancer then senior engineer, May 2018 - now
Building a unique React Native app (iOS and Android) for a US-based health tech startup. Key tech includes React, React Native, Redux, Jest, styled-component, XCode, ObjectiveC, Node.
London Food Ecommerce Startup
Freelance lead frontend engineer, Nov 2017 - May 2018
Led rebuild of existing jQuery site into React and Redux using TDD (Jest) and Flowtype, building the majority of the frontend and frontend business logic. Used expertise with maintainable and consistent compononents to ensure styles and vertical easy to follow by subsequent developers.
London Tech Startup
Freelance senior frontend engineer, Sept 2017 - May 2018
Completely designed app, visual brand, and marketing site for a London-based tech startup. Main developer of frontend using React, GraphQL, Apollo, SCSS, styled-components.
London Property Startup
Freelance senior frontend engineer, June 2017 - Aug 2017
Rebuilt an existing React app to allow white-labeling as well as contributed to green field new build app. Key tech: React, Less, Flux, MongoDB, Bootstrap, Material Design.
London Tech Startup
Senior frontend engineer, Nov 2016 - June 2016
Designed and build the frontend and marketing pages for a workflow automation app. Key technologies: React, GraphQL, Relay (Classic), Blockly (visual programming), Node.
Timecounts.org
Cofounder, lead frontend engineer, designer, UX, Dec 2012 - Nov 2017
Lead in designing and building one of the first large-scale React applications. App was initial in Knockout.js. Switched to Backbone.js and quickly realized it wasn't suitable so started building in React! App grew to 100,000 LOC so that was probably a good idea. As a cofounder raised a large seed round, found and hired first engineers. Other key responsibilities included user testing, UI/UX/AI. Spoke at various events and produced a number of presentations including.
HasFu Inc (FitFu.com, YCombinator W11)
Cofounder, lead frontend engineer, sales, marketing, community, Jun 2010 - Dec 2012
Codesigned and built an iOS fitness app in the spirit of Wii Fit. Built user base to over 250,000 user and the app was regularly featured by Apple including the WWDC wall in 2011. Raised funding from YCombinator and other investors.
BrainBakery Ltd
Cofounder, senior frontend engineer, sales, Jun 2006 - Jun 2013
Freelance full stack developers for hire. Clients included:
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Channel 4 - built their original Wordpress blog platform serving millions of users
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NHS - built the majority of their Choices campaign mobile apps, again serving millions of users
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Elsevier - all their iOS textbook apps
Portfolio
See images directory at github.com/JofArnold/cv
Open Source / Presentations
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Graphile.org contributer (documentation, site)
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Various libraries and projects: see github.com/JofArnold
Recruiters
I am not open to new opportunities, sorry.