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    ~/arisjirat

    Aris Jirat Kurniawan

    Craftsman Software Engineer

    Currently Software Engineer @ BFI Finance

    Trust me, this is nicer on a desktop: that is where you get the setup I actually work in. 🙂

    Selected projects

    1. Hardware

      ArkButton

      Designed, printed, soldered and flashed by me: 58 keys, two nRF52840s, ZMK. The tenting plate failed ten times because I printed it lying down; it had to stand up.

    2. Applied cryptography

      sirna

      Encrypted messages and files whose KEY can be destroyed on demand, and once it is gone every copy of the ciphertext dies with it, including the copies you do not control. Rust, XChaCha20-Poly1305, and the server links the header parser only, so it cannot decrypt anything it holds.

    3. AR game

      Tombakan

      Place a virtual water surface in your actual room through AR, then throw a spear at the fish matching the target colour. Unity URP + ARFoundation, 32 commits across seven weekly iterations, built for Android and iOS.

      Tombakan
    4. Algorithms from scratch

      pothole-detection

      Not one framework import. LeNet-5 convolution, pooling, softmax, cross-entropy and backpropagation, derived by hand and written in NumPy. What proves the derivatives right is not the accuracy but a numerical gradient check: error under 1e-5.

    5. Infrastructure

      homelab-platform

      k3d, ArgoCD, Vault, WireGuard, Caddy, Prometheus/Grafana/Loki/Tempo: and the page you are reading comes out of it. Anything I change straight on the cluster gets reverted by ArgoCD: annoying exactly once, a relief after that.

    Where I've worked

    1. BFI Finance

      now Software Engineer

      Workflow-driven process services

      Approval processes that run for days, executed as workflows that survive a restart.

    2. Ruangguru

      Senior Software Engineer

      A video player with quizzes inside it

      The video pauses at defined points, shows a question, and resumes once it is answered.

    3. Mola TV

      Frontend Engineer

      Maintaining the streaming video player

      Maintenance on a player already running in production: playback error handling, behaviour when bandwidth changes, and fixes along the paths that failed most often.

    Full history in About

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