Agustinus Yohannes
Indie Developer at Mantan Dev
Banjarejo, East Java, Indonesia
Summary
👤
Senior🎓
Top SchoolAgustinus Yohannes is an indie Full-Stack Web Developer with 10 years of experience, specializing in performance-driven frontend engineering using SvelteKit and pragmatic, clean architectures. He pairs responsive, scalable UIs with backend work in Node.js, Go, and PHP, and is comfortable owning deployment and production environments across GCP, AWS, Cloudflare and self-managed VMs. As a freelancer and maintainer at Mantan Dev he focuses on building efficient, maintainable systems and only integrates AI where it delivers clear value. His background as an external code reviewer and hands-on ops experience gives him a strong practical sense of code quality and reliability beyond typical frontend roles. Based in Banjarejo, East Java, he brings an indie mindset—shipping end-to-end products with a preference for simplicity and long-term maintainability.
10 years of coding experience
Bachelor's degree, Information Technology, Bachelor's degree, Information Technology at Sekolah Tinggi Teknik MalangCatholic Senior High School "St. Thomas Aquino", Tulungagung
javanese, Indonesian, English
Github Skills (50)
javascript10
sveltekit10
simulator10
genshin10
browser10
webapp10
svelte10
react10
typescript9
gcp7
google-cloud7
timer6
google-cloud-platform6
aws5
linux4
Programming languages (11)
Github contributions (5)
Mantan21/Genshin-Impact-Wish-Simulator
Aug 2021 - Jan 2023
Best Genshin Impact Wish Simulator Website, no need to download, 100% running on browser!
Contributions:40 reviews, 559 commits, 32 PRs in 1 year 5 months
reactgenshingamemihoyobrowser
Mantan21/HSR-Warp-Simulator
Jul 2023 - Feb 2025
Just a Realistic Gacha Simulator for Honkai: Star Rail, Simulate your luck indefinitely through a web-based Application.
Contributions:2 reviews, 21 PRs, 56 pushes in 1 year 7 months
honkai-star-railhonkai-starrailhsrpwasvelte
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