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.
11 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 (46)
javascript10
sveltekit10
simulator10
genshin10
typescript10
browser10
webapp10
svelte10
react10
google-cloud8
gcp7
timer5
html-renderer5
linux4
windows4
Programming languages (11)
Github contributions (5)
Mantan21/HSR-Warp-Simulator
Jul 2023 - Jun 2026
Just a Realistic Gacha Simulator for Honkai: Star Rail, Simulate your luck indefinitely through a web-based Application.
Contributions:3 reviews, 30 PRs, 73 pushes in 2 years 10 months
honkai-star-railhonkai-starrailhsrpwasvelte
AguzzTN54/SDApp-Learning
Jul 2020 - Mar 2022
Contoh Aplikasi Pembelajaran Untuk Siswa SD, menggunakan teknologi Progressive Web App, dibangun dengan Library ReactJS
Contributions:1 release, 21 commits, 3 PRs in 1 year 7 months
react
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