Callum Hart
Senior Software Engineer at Thought Machine
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolCallum Hart is a Senior Software Engineer based in London with 11 years of experience building cloud-native banking and fintech systems. With an MSc in Computer Science and a BSc in Economics, he blends financial domain knowledge from Visa with deep backend engineering at Thought Machine, focusing on scalable core banking platforms. He has a maker’s mindset—comfortable shipping production services and tinkering with side projects—and brings a pragmatic, product-aware approach to complex distributed systems. His international background, including study and tutoring time in Seoul, informs a collaborative, cross-cultural working style. Notably, he moved from financial analysis into engineering, giving him a rare combination of quantitative business insight and hands-on technical delivery.
11 years of coding experience
5 years of employment as a software developer
MSc Computer Science, MSc Computer Science at University of BathA Levels 5A*s, A Levels 5A*s at Woodhouse CollegeStudy Abroad Economics, Study Abroad Economics at Yonsei UniversityBSc Economics with Study Abroad (Seoul), BSc Economics with Study Abroad (Seoul) at University of Bristol
Korean, English
Github Skills (13)
css10
side-effects10
styles10
bem10
immutability10
robustness10
css-variables10
preprocessor10
css-in-js9
maintainability6
semantics6
separation-of-concerns4
html3
Programming languages (2)
Github contributions (5)
callum-hart/Slab
Jun 2016 - Jul 2016
Contributions:32 commits, 17 pushes, 2 branches in 29 days
callum-hart/immutable-styles
Jan 2018 - Nov 2019
A library for styling web interfaces with a focus on predictability and robustness. It uses immutability to remove side effects often tied to CSS, allowing UI bugs to be caught ahead of time!
Contributions:3 releases, 227 commits, 12 PRs in 1 year 9 months
ahead-of-timerobustnesscss-variablescsspredictability
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