10+
Years Experience
130
Completed Projects
105
Happy Customers
24+
Honors and Awards
My Services
Recommendations
Hubert L
Product Manager at Wizeline
Working with Callum has been a pleasure.
Better yet - I alerted them of a minor issue
before going to sleep. The issue was fixed the
next morning. I couldn't ask for better
support. Thank you Artur! This is easily a 5
star freelancer.
Jason A
CTO at TianCai
Callum is a skilled developer in a lot of
different areas. He contributed highly
valuable work for us in a complex web app
using react.js. Also, he successfully
developed a Laravel php/js app as fullstack
dev.
Lee Jarvis
CTO, Co-founder and Technical Advisor at Spark Real Estate Software
Callum has an amazing discovery and a
pleasure to work with - the project has gone
along smoothly - he came up with ideas and
helped push the project along really well.
Technically superb. Would recommend for any
project
Rod Lee
CEO at Asyst Data Group
Great work done by Callum. What most
impressed me was his approach to unexpected
circumstances in the process of doing the
work. Mature and practical approach which will
lead, hopefully, to additional jobs.
Education
Bachelor's Degree in Computer Science
University of Wales, Bangor
September 2010 - May 2013
- Software Programming
- Software Analysis and Web Design
- Artificial Intelligence
- Data Structures and Algorithms
Work History
KingIT Solutions
Senior Fullstack & Blockchain Developer
June 2020 - October 2024
- Managed and Maintained responsive and accessible web applications utilizing React, Node.js, and Next.js.
- Architected productive web applications to visualize data from over 80 schools, communicating critical education information to more than 1M users.
- Collaborated with a team of scientists and researchers to create user-friendly interfaces for over 7 complex environmental data sets, enhancing public understanding of climate change issues and increasing user engagement by 45%.
- Developed app integration with REST / GraphQL and other APIs for Google Maps, social media logins, payment processors, and other services.
- Conducted unit and load testing for high profile customer facing applications, which reduced system failure rate by 70%.
- Architected a cryptocurrency trading platform, implementing WebSocket for real-time market data updates, and integrating Web3.js for wallet connections, resulting in a 40% increase in daily trading volume.
TechSmiths
Fullstack Developer
October 2017 - March 2020
- Established cutting-edge communication platform that allowed users to connect, chat in real time, with features like file sharing, video conferencing, and secure authentication mechanisms.
- Partnered closely with 15 members to develop company's healthcare system using React, Redux, Electron, Node.js, Express, and MySQL.
- Led collaboration with a team of 5 backend developers to architect and implement a RESTful API optimized for React Native mobile applications, reducing API call latency by 40%.
- Translated 9 UI/UX design wireframes into actual code using Next.js 13, React, three.js and ensured smooth operation of company infrastructure components resulting speed increase by 35%
- Led Agile development methodologies, including daily standups, sprint planning, and retrospective meetings for 2 years.
- Optimized application performance and refined UI responsiveness through code optimization and caching strategies by 10% using React hook, Jest, CDN links.
- Conducted code reviews and provided guidance and mentoring to 6 junior developers.
- Successfully deployed 6 applications on AWS and performed continuous integration and deployment using Docker.
Crate47
Frontend Developer
November 2013 - June 2017
- Coordinated closely with 2 designers, 10 product managers, and QA teams to ensure delivery of high-quality software and implemented modernization of legacy codebases by migrating to modern React architectures. Through this effort, improved maintainability and performance of these projects by 45%.
- Executed the design and launch of 20+ responsive and accessible full-stack applications with Bootstrap and JavaScript; achieved a 30% increase in mobile user engagement, driving overall site traffic and interaction levels.
- Designed 4 new user interactive landing pages using React, Next.js, HTML, XHTML, and CSS with web design expertise.
- Developed B2B, B2C system for individual customers and businesses to make transactions and elevated design resulting in 80% boost in conversion rate.
- Created onboarding 4 web apps for customers to make transactions secure and safe using React, Vue.js, Node.js and PHP.
- Managed frontend website development using WordPress, HubSpot, and other editing software.
- Created over 12 responsive application UIs using React (ES6), Electron, Node.js and functional components libraries with support for switching between Microsoft Azure and Google Cloud APIs, Terraform.
Contact information
-
Country:
UK -
City:
Cardiff
Get in touch
