Justin Manley
Senior Software Engineer at Synthesia
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolJustin Manley is a Senior Software Engineer based in London with 12 years of experience building interactive front-end systems at the intersection of art, architecture, and technology. He has shipped features at scale across companies from Google to Synthesia and Sensat, with past work spanning AR selfie filters, mapping tools, and spatial data platforms. A contributor to prominent open-source Leaflet projects, he has deep practical expertise in geospatial UI—refactoring core components, adding editing workflows, and improving plugin integrations and testing. His background in mathematics and hands-on roles in research and civic mapping informs a pragmatic, design-aware approach to complex visualization problems. Colleagues rely on him for clean refactors that improve maintainability while preserving UX fidelity.
12 years of coding experience
9 years of employment as a software developer
Hopkins SchoolCareer Discovery Program, Harvard Graduate School of DesignBachelor of Science (BS) Mathematics, Bachelor of Science (BS) Mathematics at University of ChicagoComputer Science, Computer Science at Stanford University
Stackoverflow
248reputation
28kreached
2answers
8questions
Github Skills (20)
javascript10
leaflet10
ui-design10
uid10
front-end-development10
image-manipulation10
angularjs10
testing9
css9
html9
hakyll6
haskell6
svg6
makefile6
6
Programming languages (9)
Github contributions (5)
publiclab/Leaflet.DistortableImage
Dec 2014 - May 2015
A Leaflet extension to distort or "rubber sheet" images
Role in this project:
Front-end Developer
Front-end DeveloperContributions:56 commits, 2 PRs, 7 comments in 5 months
Contributions summary:Justin primarily contributed to the restructuring and enhancement of the directory structure and core components of a Leaflet extension for distorting images. They refactored the code to move image overlay editing into a dedicated class and reorganized the file structure to improve clarity. The user also focused on implementing user interface elements for image manipulation such as toggling transparency and deleting the image overlay using Leaflet.Toolbar.
leafletdistortsheetrubbergeotiff
Leaflet/Leaflet.draw
Sep 2014 - Feb 2015
Vector drawing and editing plugin for Leaflet
Role in this project:Front-end Developer
Front-end DeveloperContributions:30 commits, 2 PRs, 15 comments in 5 months
Contributions summary:Justin's commits primarily focused on enhancing the editing capabilities of the Leaflet.draw library. They refactored code, moved marker-specific edit handling into a separate file, and added tests to ensure the correct behavior of the editing features. Furthermore, the user fixed an issue related to marker appearance in editing mode and added an example page demonstrating the full drawing and editing toolbar functionality. These changes improved the library's usability and maintainability.
leafleteditingvectordrawing
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