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Software & Systems Developer
I build reliable software products and practical systems across web apps, backend services, automation, data, and deployment workflows. I enjoy turning ideas into maintainable solutions that run well in the real world.
Focus
System architecture
Status
Available
Each write-up walks through a real project: the problem, how I designed it, the trade-offs I chose and what happened after it shipped.
Scope of my work on HOJA (hoja.vn): social and Zalo OA integrations, influencer tools, Kanban, MISA e-invoicing, plan billing, and the stack used.
A cross-platform transaction management system for banking partners, with a shared SDK keeping RBAC in sync between Portal and PWA.
In-browser video compression with ffmpeg.wasm in a Web Worker, plus face verification for Kiosk terminals that matches embeddings in Qdrant, not photos.
Two servers at home, an ARM board and a Debian PC, serve this site together through a Cloudflare Tunnel, ship releases from Jenkins and fail over unattended.
A microservices monorepo with a NestJS gateway, three Go services and two Node workers, where the entire topology is generated from a single registry file.
Rebuilding a travel platform as four repos — infrastructure, storage, a NestJS API and a Next.js app — Authentik owns identity, Makefiles build the substrate.
A real contribution calendar from my public GitHub profile — refreshed hourly so this portfolio reflects the work I am shipping, not a static screenshot.
Live public data
@Illya1123 · Nov 9, 2025 — Nov 12, 2026
GitHub contribution calendar. Nov: 2, Dec: 20, Jan: 43, Feb: 20, Mar: 42, Apr: 24, May: 35, Jun: 168, Jul: 483, Aug: 429, Sep: 1,087, Oct: 677, Nov: 163.
Source: github.com
Total contributions per week over the last 12 months
