terminal - ryan@ryandu

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ryan@ryandu.dev

role: Systems Engineer, SpringUp Solutions
mode: mostly remote
ships: clients, backends, billing, RL bots
langs: ts java python c++ rust sql glsl
hosting: self-hosted, oracle cloud
tools: claude code, custom mcp servers
study: computer engineering, midlands tech
speaks: english, chinese

Ryan Du

Systems engineer and full-stack builder. At work I run the firewall and VPN links that connect an offshore development team to production. On my own I ship complete products end to end: the client, the licensing backend, payments, deployment, and the simulator and reinforcement-learning pipeline behind a trained combat bot. All of it is self-hosted on a server I run.

type help to look around, or open pissclient

projects

#pissclienta closed-source Minecraft cheat client, and the platform behind it.

pissclient

A licensed Fabric client for Minecraft, built and run end to end. Yes, it's a cheat client. The interesting part is the combat bot.

Sword bot trained with reinforcement learning. A duel simulator that matches vanilla sword combat, checked by a parity harness, and MLP, GRU and transformer policies trained with PPO league play on 3,047 recorded fights.
Distillation. The transformer is distilled into a GRU, ported to Java, that matches PyTorch to within 6e-6. A distributed training hub lets volunteer PCs help train.
Inference server. Models run on a WebSocket server, so they never ship in the client.
Licensing backend. Fastify and TypeScript on PostgreSQL and Redis: accounts, revocable sessions, machine-bound licences and Stripe billing.
Client. Combat and movement modules built to get past open-source anticheats, a Hyprland-style desktop UI, and GLSL shaders on OpenGL and Vulkan.

PersonFormer, the most advanced sword bot, drawn the way pissclient's own visualizer draws it: what it sees, each block's residual, the heads' hidden layer and the keys it picks, with orange lines pushing a node up and blue pushing it down. Under each block, where its four heads looked back. The shape is real (d128, 4 blocks, 4 heads, 256-tick context, ~875k weights); the numbers here are made up, since the trained model never leaves the server.

#mineuxa desktop for Minecraft. the look you're seeing right now.

MineUX

pissclient's desktop-style UI with every cheat removed, as a standalone Fabric mod. One account for the game, friends and chat.

Full and Lite editions, built so pissclient can sit on top of it.
Live screen sharing between friends through a relay, built on a Rust native screen-capture library.
Accounts, friends, DMs and IRC on a TypeScript and PostgreSQL API, live at mineux.com.
Modrinth release coming soon.

#ambiencea Minecraft subscription client I own.

Ambience

I joined a friend's client as a developer, then took over as sole owner of its codebase, database and subscribers.

Ported my pissclient sword bot and its adapt brain to C++, called from the Java client over JNI.
Billing and licensing. Built and run its Stripe billing and licensing, with licences bound to the machine at sign-in.

#peexel-casinoa multiplayer casino MMO with play-money chips, on Steam.

Peexel Casino

A server-authoritative multiplayer casino for Windows and Linux: poker, blackjack, roulette, slots and Big 2, all with play-money chips and a cryptographic RNG.

Server. Game logic in TypeScript modules on Nakama, with separate production and dev stacks. Restarts refund in-flight bets so chip balances stay correct.
Client. Godot 4 with Steam sign-in, a cashier shop, tiered loot, raid bosses and a desktop-pet mode that turns the window into a click-through overlay.
Trust and safety. Mute, block, rate-limited player reports, in-game bug reports and a web admin panel with an audit log.
Shipping. Self-hosted CI with game-rule tests and a two-client network test, automatic deploys and a scripted Steam build. 300+ merged PRs.

#gembotmy own AI chatbot for Discord.

gembot

A Discord bot on the Gemini API that you just talk to. No slash commands.

MCP tools for live stock prices, live web search and indexing, and game statistics.
Hooked up to Hermes, OpenClaw and pi.dev.

work - springup solutions

experience

Systems Engineer

SpringUp Solutions · April 2025 to now · mostly remote

Run the company's network, VPN and server infrastructure, mostly remotely, with occasional on-site work at its colocation datacenter.
Installed and configured a Zyxel firewall at the colocation site, including NAT, routing and an IKEv2 VPN that gives the offshore development team secure access to the servers.
Built a site-to-site VPN between the colocation firewall and the in-house production server.
Set up the office router on OpenWrt with split-horizon DNS for the platform's app and API subdomains.
Keep remote administration VPN-only, and wrote the internal network runbook.

ZyxelIKEv2site-to-site VPNOpenWrtIISLinux

infra - oracle cloud

self-hosted

One server, everything on it

Every project here runs on an Oracle Cloud VPS I set up and look after. This site too.

pissclient auth, inference and training services
MineUX API and site
Ambience auth server and build pipeline
Peexel Casino production and dev Nakama stacks, plus CI
gembot

Services run under systemd, Docker Compose and pm2 behind an nginx reverse proxy with certbot TLS. Apps and databases stay off the public internet.

On the side: Terraria and All the Mods 10 game servers on Oracle Cloud ARM instances, with a Python asyncio bridge that streams console logs to Discord and runs commands both ways.

Oracle CloudLinuxnginxcertbotDockersystemdpm2

contact

Say hi

Email me at ryandu101@gmail.com

github

secretnarwhal / README.md github.com/secretnarwhal

My README lives on GitHub.