BUILTBYSIN
Available for builds
Message Sin
Sin — builder, operator & founder of BuiltBySin LLC

I ship the systems most people stall on.

Solo developer building since 2009. I design and ship marketplaces, game servers, internal tools, and custom software end-to-end — and I've spent just as long leading teams and communities. I build with the business in mind, not just the code.

Building since 200920K+ community led200K InstagramSolo · end-to-end
01

What I build

Marketplaces & platforms

Two-sided marketplaces

Listings, order flow, seller tooling, and secure fulfillment — the full machinery of a working marketplace, not a mockup.

Game servers & infra

Servers, VPS & plugins

FiveM, Minecraft, Rust, ARK and more — VPS setup, databases, and custom plugin and script development. From playing to moderating to owning the stack.

Internal tools & ops

Ops portals & dashboards

Document hubs, compliance and tax tracking, SOP systems — your messy back office turned into one tool that runs out of the box.

Web, programs & automation

Custom software

Real websites, custom programs, and automations for the work you keep doing by hand.

Games & simulation

Real-time systems

2D and 3D games, Unity systems, server-authoritative play, and from-scratch real-time physics.

UIs, HUDs & debugging

Interfaces & fixes

Custom UIs and HUDs, plus reading unfamiliar codebases to find and fix what's broken.

Platforms & tools I work in

FiveMMinecraftRustARKUnityPanda3D + BulletPythonDatabases / SQLVPS / LinuxCustom UIs & HUDsDiscordStripe / PayPal
02

Build log

01
BuiltBySinLiveweb · payments · marketplace

A peer-to-peer marketplace for game items, accounts, currency, and services, with built-in order fulfillment routed through Stripe and PayPal.

I can stand up a real two-sided marketplace — and run it as a business.

02
Game ServersLivefivem · minecraft · vps · databases

Owned and developed game servers across FiveM, Minecraft, Rust, and ARK — VPS, databases, and custom plugins and scripts. Went from playing to moderating to running the whole stack.

I run live infrastructure and players, not just code on my machine.

03
CommunityLive20k members · 200k instagram

Built and led a 20K+ member community as owner and lead dev, with a 200K Instagram audience behind it.

I can build an audience, develop for it, and keep it.

04
Ops PortalShippedpython · desktop app · ops

A standalone internal portal holding business documents, compliance checklists, multi-state tax-nexus tracking, and SOPs — one app for the entire back office.

I turn scattered back-office work into a single tool that runs with no setup.

05
Physics SandboxShippedpanda3d · bullet · shaders

A controllable 3D sandbox with rigid-body physics, a live settings menu, and shader-based graphics — built from scratch as an experiment environment.

I'm comfortable in the deep end: real-time loops, physics, and graphics.

06
GrowBySin (GBS)In developmentunity · server-authoritative · economy

A sandbox MMO with a tradable in-game economy, lock-based ownership, and server-authoritative architecture — designed from a full written blueprint before a line of code.

I design complex systems with real economies, not just screens.

03

Operations & people

The build work is one half. The other half is running things — teams, inventory, and people — at a high level for large, well-known companies since 2015.

Leadership

Team leadership

High-level supervision and floor management. I keep teams moving and set the pace without micromanaging.

Operations

Inventory & ordering

Inventory management, counting, and ordering kept accurate and on time — the operations that stop a business from leaking money.

Delegation

Delegation & workflow

Delegating high-level tasks and shaping workflows that put the right work in the right hands.

People

Reading & placing people

I read people daily — what they need, what they're capable of — and move them to where they perform best.

A personable manager people actually open up to. I learned it on the floor in 2015 from a sibling who managed — then took it further, leading teams and running my own business.

04

What I'll build for you

Internal ops portal

Your documents, checklists, and processes in one tool your team actually opens.

Fixed price · ~2 weeks

Marketplace MVP

A working two-sided marketplace — listings, orders, payouts — you can launch.

Fixed price · scoped per build

Game server & custom scripts

FiveM, Minecraft and more — server stood up, configured, and scripted to spec.

Fixed price · per server

Discord-integrated tool

Bots and tools wired into your community, tied to the systems you already run.

Fixed price · ~1–2 weeks

Website, program or automation

The site, app, or repetitive task — built, or automated so it runs itself.

Fixed price · scoped per build

Custom UI / HUD work

Custom interfaces and HUDs for your game, server, or app.

Fixed price · per project

Fixed scope, fixed price, agreed before we start — so you know the number before you say yes. First build goes out at an intro rate in exchange for a testimonial.

Tell me what you need built.

Create a quick account and send me a brief — I'll reply within a day or two.