Mathusan Selvarajah
Co-Founder & CTO at Sunday
Old Toronto, Ontario, Canada
Summary
🤩
Rockstar🎓
Top SchoolMathusan Selvarajah is a pragmatic engineering leader and founder with 10 years of experience building cloud-native platforms, developer tooling, and consumer-facing products. As Co-Founder & CTO of Sunday and former Firebase software engineer, he helped launch Firebase Hosting public preview at Google I/O 2024 and drove its GA readiness for Cloud Next 2025 while reverse-engineering Next.js features and building local emulation, middleware, and caching strategies. His background spans production engineering at Shopify—where he led a zero-downtime migration of millions of merchant domains and built Kubernetes controllers for TLS automation—to contributions at Red Hat on Kubernetes CSI certification and open-source NFS CSI improvements. He’s an active builder outside work, shipping side projects and startups (Stubby, Wallaby, Hawkeyes) and contributing to high-profile open-source tools like firebase-tools to improve CLI UX and backend management. Comfortable at the intersection of product and infrastructure, he blends hands-on systems engineering with product intuition to simplify complex developer experiences. Based in Toronto, he pairs entrepreneurial drive with a track record of shipping reliable, scalable systems across cloud platforms.
11 years of coding experience
10 years of employment as a software developer
Exchange, Exchange at National University of SingaporeBachelor of Science (BSc) Computer Science, Bachelor of Science (BSc) Computer Science at University of TorontoHigh School Diploma, High School Diploma at Middlefield Collegiate Institute
Github Skills (5)
command-line-tool10
firebase10
back-end-development9
gcp8
documentation8
Programming languages (12)
Github contributions (5)
firebase/firebase-tools
Feb 2024 - May 2025
The Firebase Command Line Tools
Role in this project:
Back-end Developer
Back-end DeveloperContributions:117 reviews, 105 PRs, 313 pushes in 1 year 2 months
Contributions summary:Mathusan primarily focused on modifying and documenting Firebase App Hosting command-line tools. Their contributions included formatting command descriptions to adhere to guidelines, suggesting they were involved in improving the user interface and documentation. They also updated commands for backend management, specifically related to listing, getting, and deleting backends and also fixing cloud build errors.
command-line-toolfirebase
mathu97/FC-CSI-Driver
Aug 2018 - Dec 2018
Contributions:17 commits, 31 pushes, 4 branches in 3 months
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