https://arisjirat.com/ Aris Jirat Kurniawan — studies, projects, research, tools and setup. A hand-built split keyboard, a k3d homelab, and computer-engineering coursework. en-US https://arisjirat.com/projects/project-sirna https://arisjirat.com/projects/project-sirna The successor to otm. otm keeps a master key on the server, so the server can decrypt everything it holds — not patchable, because it is the shape of the design. sirna never lets the key reach the server at all. Sun, 30 Aug 2026 00:00:00 GMT rust cryptography xchacha20-poly1305 blake3 webassembly self-hosted https://arisjirat.com/projects/project-tmprl https://arisjirat.com/projects/project-tmprl A terminal client for Temporal, aiming at parity with the web UI. Four days old: the gRPC layer exists, the TUI does not. This is what it is honest to claim at that stage. Sun, 30 Aug 2026 00:00:00 GMT rust temporal grpc tui in-progress https://arisjirat.com/gear/tool-clowner https://arisjirat.com/gear/tool-clowner One Bash script that copies a .app into a second copy with its own bundle identifier — two Braves, two Slacks, two of anything, running side by side with separate data. Mon, 24 Aug 2026 00:00:00 GMT macos bash codesign cli productivity https://arisjirat.com/projects/project-v-pipeline https://arisjirat.com/projects/project-v-pipeline A personal video generation pipeline — the app and its files live in the homelab, the GPU is rented on RunPod Serverless and dies the moment a job finishes. Notes on idempotency, dry runs, and why restarting a worker can make you pay twice. Mon, 17 Aug 2026 00:00:00 GMT python fastapi gpu runpod homelab ffmpeg sqlite https://arisjirat.com/projects/project-tombakan https://arisjirat.com/projects/project-tombakan A Unity AR game where you place a water surface in your actual room and spear the fish matching a target colour. Seven weekly iterations, a tester report each time, and a scope that grew from a colour drill into a marine-life learning game. Mon, 10 Aug 2026 00:00:00 GMT unity ar arfoundation csharp game android ios https://arisjirat.com/gear/setup-arkbutton-keyboard https://arisjirat.com/gear/setup-arkbutton-keyboard 58 keys, two nRF52840s, ZMK, and one thumb position deliberately left empty. Notes from building a wireless split keyboard — including the clock bug that killed the right half and the tenting plate that only printed once it stood upright. Mon, 10 Aug 2026 00:00:00 GMT keyboard zmk wireless split-keyboard nrf52840 3d-printing openscad charybdis handwired https://arisjirat.com/research/research-pothole-detection https://arisjirat.com/research/research-pothole-detection Convolution, pooling, softmax and backpropagation derived by hand and written in NumPy — no PyTorch, no TensorFlow, no autograd. From 75.7% to 94.4% accuracy, and how to prove the gradients are actually right. Wed, 01 Jul 2026 00:00:00 GMT cnn numpy python computer-vision lenet-5 backpropagation deep-learning https://arisjirat.com/projects/project-fate-studio https://arisjirat.com/projects/project-fate-studio A viewer and live simulator for fate statecharts — send events, fire timers, resolve invocations, and watch the active state change over Server-Sent Events. One static binary, no outbound requests at all. Fri, 05 Jun 2026 00:00:00 GMT go statechart sse react elkjs visualization https://arisjirat.com/projects/project-fate https://arisjirat.com/projects/project-fate Harel statecharts in Go — hierarchy, parallel regions, history, guards and delayed transitions. Zero dependencies, deterministic, and snapshots that restore exactly, including inside Temporal workflows. Fri, 05 Jun 2026 00:00:00 GMT go statechart state-machine scxml xstate library https://arisjirat.com/gear/setup-dactyl-manuform-keyboard https://arisjirat.com/gear/setup-dactyl-manuform-keyboard The handwired split keyboard I used before going wireless. Sculpted case, two Pro Micro ATmega32U4s, a TRRS cable — and QMK firmware that, honestly, never shipped. Tue, 07 Apr 2026 00:00:00 GMT keyboard qmk handwired ergonomic dactyl-manuform pro-micro split-keyboard https://arisjirat.com/gear/setup-homelab https://arisjirat.com/gear/setup-homelab Kubernetes on k3d at home, exposed through a VPS and a WireGuard tunnel, with ArgoCD pulling changes from Git. Including the page you're reading. Wed, 18 Mar 2026 00:00:00 GMT kubernetes k3d argocd gitops grafana prometheus wireguard caddy vault docker https://arisjirat.com/gear/setup-dotfiles https://arisjirat.com/gear/setup-dotfiles Terminal, editor, and macOS window-manager config managed via GNU Stow + Homebrew Bundle — clone, run one script, machine ready. Sun, 01 Feb 2026 00:00:00 GMT dotfiles stow homebrew macos neovim tmux ghostty aerospace zsh https://arisjirat.com/research/project-pcd https://arisjirat.com/research/project-pcd This project aims to distinguish between **clean** and **dirty** ceramic floor conditions using digital image processing techniques. Tue, 30 Dec 2025 00:00:00 GMT image-processing computer-vision python https://arisjirat.com/projects/project-lemme https://arisjirat.com/projects/project-lemme Lemme is an AI-assisted quiz app. Users upload screenshots of quizzes, OCR extracts the question text, and multiple LLM providers generate candidate answers along with their reasoning... Sat, 20 Sep 2025 00:00:00 GMT go fiber solidjs ocr llm redis mysql https://arisjirat.com/projects/project-gostudentubl https://arisjirat.com/projects/project-gostudentubl Automated attendance runner for Moodle-based courses with scheduled execution. Fri, 29 Aug 2025 00:00:00 GMT go automation moodle docker cron https://arisjirat.com/projects/project-tugas_mp https://arisjirat.com/projects/project-tugas_mp A simple Android app built for educational purposes. Calculates the area and perimeter of basic 2D shapes like squares, rectangles, and triangles. Sun, 06 Jul 2025 00:00:00 GMT android mobile java gradle https://arisjirat.com/projects/project-workspace-mobile-kampus https://arisjirat.com/projects/project-workspace-mobile-kampus A Flutter app for campus use with Supabase for auth and backend — including the OAuth flow that has to be reconfigured every time the environment moves. Fri, 04 Jul 2025 00:00:00 GMT flutter dart supabase oauth mobile https://arisjirat.com/projects/project-wa-bot-notif https://arisjirat.com/projects/project-wa-bot-notif WhatsApp notification service — Go + whatsmeow. Mon, 23 Jun 2025 00:00:00 GMT go whatsapp whatsmeow notifications rest-api sqlite https://arisjirat.com/projects/project-otm https://arisjirat.com/projects/project-otm Paste a message, get one link, and the link dies once it's opened. Go + chi + SQLite, with layered encryption: a random key per message, and that key itself encrypted with a master key. Sat, 14 Jun 2025 00:00:00 GMT go chi sqlite aes-gcm encryption self-hosted https://arisjirat.com/projects/project-busgo https://arisjirat.com/projects/project-busgo A UI prototype for booking bus tickets — search, pick a bus, pick a seat, enter passenger details, pay, ticket. Flutter with Riverpod and go_router, no backend. Fri, 13 Jun 2025 00:00:00 GMT flutter dart riverpod go-router ui mobile https://arisjirat.com/projects/project-aplikasi_absen https://arisjirat.com/projects/project-aplikasi_absen This app was built by the Mobile Programming group using Flutter. Wed, 04 Jun 2025 00:00:00 GMT attendance mobile https://arisjirat.com/projects/project-php https://arisjirat.com/projects/project-php A simple web app for managing course data using PHP and MySQL. Supports **CRUD (Create, Read, Update, Delete)** operations with a si... Tue, 13 May 2025 00:00:00 GMT php mysql crud tailwind coursework https://arisjirat.com/projects/project-marcom_services https://arisjirat.com/projects/project-marcom_services The Marcom dashboard's backend — Elysia on the Bun runtime, MySQL, JWT, Socket.IO on a separate port, and an expiry cron triggered over HTTP. Fri, 25 Apr 2025 00:00:00 GMT bun elysia typescript mysql rest-api socket-io https://arisjirat.com/projects/project-marcom https://arisjirat.com/projects/project-marcom An internal dashboard for tracking marketing communications material by brand, cluster, feature, and type — with expiry reminders and realtime updates. Next.js 15 + React 19 on the front, Bun + Elysia behind it. Tue, 11 Feb 2025 00:00:00 GMT nextjs react typescript dashboard tanstack-query zustand socket-io https://arisjirat.com/projects/project-beepresent https://arisjirat.com/projects/project-beepresent A course-portal scraper wrapped as an API and a CLI — course lists, assignments, quizzes, and attendance submission, with a one-week cache because the data barely moves. Wed, 06 Nov 2024 00:00:00 GMT typescript bun cheerio scraping cli rest-api https://arisjirat.com/research/study-device-input-output https://arisjirat.com/research/study-device-input-output Exploring computer input and output devices and peripherals Mon, 09 Oct 2023 00:00:00 GMT input-output peripherals keyboard mouse printer monitor https://arisjirat.com/research/study-digital-security https://arisjirat.com/research/study-digital-security Digital security, ethics, and privacy in information technology Mon, 09 Oct 2023 00:00:00 GMT security privacy malware ethics phishing green-computing https://arisjirat.com/research/study-mid-summarize https://arisjirat.com/research/study-mid-summarize Summary and review of key topics from the first chapters Mon, 09 Oct 2023 00:00:00 GMT summary review hardware storage-units terminology https://arisjirat.com/research/study-program-apps https://arisjirat.com/research/study-program-apps Programs and applications: roles, types, and security in IT Mon, 09 Oct 2023 00:00:00 GMT software applications operating-systems open-source security-tools https://arisjirat.com/research/study-component-of-computer https://arisjirat.com/research/study-component-of-computer Computer components inside the casing and data representation systems Mon, 02 Oct 2023 00:00:00 GMT hardware cpu memory binary data-representation https://arisjirat.com/research/study-storage https://arisjirat.com/research/study-storage Data storage in computers and cloud devices: a complete guide Mon, 02 Oct 2023 00:00:00 GMT storage hard-drive ssd cloud-storage nas backup https://arisjirat.com/research/study-computer-devices https://arisjirat.com/research/study-computer-devices Buying guide and characteristics of various technology devices Tue, 12 Sep 2023 00:00:00 GMT devices hardware purchasing-guide cloud-computing maintenance https://arisjirat.com/research/study-digital-era https://arisjirat.com/research/study-digital-era Awareness in the digital era: preventing hoax and digital crime Tue, 12 Sep 2023 00:00:00 GMT digital-literacy hoax-prevention cybercrime fact-checking https://arisjirat.com/research/study-basic-computer https://arisjirat.com/research/study-basic-computer Introduction to basic computer concepts and their role in modern society Mon, 11 Sep 2023 00:00:00 GMT computer-basics hardware internet digital-security https://arisjirat.com/projects/project-algo3 https://arisjirat.com/projects/project-algo3 This repository is prepared for the ALGO3 teaching pattern based on: algorithms graph c-programming https://arisjirat.com/projects/project-network https://arisjirat.com/projects/project-network This folder is organized as a hands-on course for learning computer networking with Cisco Packet Tracer. networking cisco packet-tracer https://arisjirat.com/projects/project-test_presence https://arisjirat.com/projects/project-test_presence An attendance app with geolocation-validated check-in and a leave-request flow. Go + SQLite backend, React front end with a map preview of the office radius. go react sqlite geolocation attendance