Gabriel McCallin

gabriel.mccallin@hey.com

Technology Leader | Strategic Architect | People Mentor

I help organisations transform their vision into reality through strategic technology decisions and high-performing team cultures. I believe in agile delivery, psychological safety, and the power of experimentation to drive innovation.

Core values

• Visionary strategy: Co-creating systems that support and accelerate business growth.

• Empowered leadership: Developing talent through coaching and building cultures of trust.

• Technical excellence: Deep expertise in the JavaScript / TypeScript ecosystem and cloud-native infrastructure.

• User-centric delivery: A relentless focus on user experience, code quality, and minimising waste.

Experience

AND Digital, Staff Software Engineer

September 2022 - present

I help companies bring their digital products to market. I support teams by building trust, fostering a creative and innovative environment, and establishing guiding principles.

• Continuous automated testing
• Continuous deployment
• Pair programming
• Test-driven development
• Optimising for experimentation and change
• Customer behaviour and variant testing
• Learning as a success metric

As part of technical leadership teams, I have worked on:

• Aviva, replatform of the consumer mobile application from Xamarin to React Native
• Frasers Group (Sports Direct), rebuild of the consumer React Native white label mobile application
• HCA Healthcare UK, replatform of the consumer primary care web and mobile applications to React Native and Nextjs
• CRUK, rebuild of the consumer website from Drupal to a headless model with React and Contentful

Technologies used:

Typescript React React Native Expo Tamagui nextjs GraphQL webdriverio Appium Firebase

Thoughtworks, Technical Lead

October 2018 - September 2022

I led cross-functional product teams building platforms, web applications and business processes.

Some of the products I worked on:

• NHS 111, website infrastructure replatform in Azure to handle the increased user traffic due to COVID
• Tesco, design system and React component library
• Open GI, web and infrastructure replatform from on-prem to Azure
• Evri, new delivery user journeys during the rebranding from Hermes
• WorldFirst, React replatform for a consumer currency exchange financial product
• Wood Mackenzie, technical and ways of working review for an industrial energy visualisation platform

Technologies used:

Typescript .NET Core Node styled-components Vue React GraphQL Cypress Docker Kubernetes AWS Azure Netlify Powershell Terraform AWS CDK Firebase

Whitbread, DevOps Lead & Senior Engineer

September 2015 - October 2018

As part of a digital transformation of Whitbread Digital, I led a product team in the effort to adopt modern Agile and DevOps practices.

I helped to deliver a new responsive search experience for Premier Inn, through concept, MVP and launch.

Technologies used:

Adobe Experience Manager Typescript Node Jenkins Akamai SCSS Angular

Grand Visual, Technical Lead

April 2014 - September 2015

I led a development team to build interactive, dynamic and data-driven digital experiences in public spaces and retail environments.

I was also responsible for line management, technical sales, mentoring and recruitment.

Technologies used:

Azure Actionscript Flash JavaScript Node WebSocket

Freelance, Technical Lead

August 2010 - March 2014

Development and delivery of multiple software projects including games, installations, websites and digital campaigns.

Web and advertising agencies include BD Network, Razorfish, unit9, Albion, WEIR + WONG, Spark44, Digital Annexe and Kin Design. Clients included Google, Jaguar, Mercedes-Benz, Audi, Uniqlo, National Lottery and Sony Pictures UK.

TBWA, Senior web developer

March 2007 - August 2010

Front end web development for multiple clients such as Canon, Nike, Nissan and Mazda.