Jack MarianiAvailable for work

Games. Systems.
A little playful chaos.

A closer look at my Unity and AI work, from multiplayer games and large simulations to tools for the team.

Choose a project to see my contribution.

You Suck at Parking official game artwork with cars racing around a winding track

You Suck at Parking

Lead Unity DeveloperHappy VolcanoMy work: 2023–2024

Multiplayer mayhem, backed by deterministic systems and a coordinated multi-platform release.

Photon Quantum · PlayFab · PC & consoles

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First-person gameplay in Critical Strike CS on a sunlit urban map

Critical Strike CS

Lead Unity DeveloperVertigo GamesMy work: 2017–2018

Fast-paced online firefights, with multiplayer systems and the core framework behind the action.

Photon · PlayFab · Mobile FPS

100M+ downloads on Google Play

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Grey Eminence globe showing the simulation map and economy interface

Grey Eminence

Unity Lead DeveloperThe NestinarsMy work: 2020–2023

A globe of interconnected systems, built around data-oriented architecture and large-scale simulation.

Unity DOTS · Simulation · Procedural worlds

1M+ hexagonal tiles

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More projects

GPixel title artwork with colorful cars on a yellow background

GPixel

Unity Multiplayer SpecialistJesterday StudioMy work: 2024–2025

Turn-based racing on a paper world, with player data, authentication and backend services behind the game.

PlayFab · Azure Functions · MVVM

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Players and customers inside a colorful Slimeatory shop

Slimeatory

Unity Lead DeveloperThe Navalua FamilyMy work: 2017–2022

A playful mobile shop with persistent player data, live services and a player-controlled marketplace.

PlayFab · Player marketplace · iOS & Android

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MR Guardian overview graphic showing review reports and rule findings

MR Guardian

AI engineeringProduction tool · Open source

AI-assisted Unity code review, used in production and part of my regular workflow. Deterministic rules and focused LLM checks surface risks for the team.

Python · LLM orchestration · Unity review rules

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Studio Agent Nexus board with tasks extracted from production documents

Studio Agent Nexus

AI engineeringProduction tool · Open source

Project knowledge, task extraction and risk detection from game-design docs, with source citations. Used in production and part of my regular workflow.

Python · RAG · Agentic workflows

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Virtual Reality Experiences studio logo

Syla VR

Unity XR SpecialistVirtual Reality ExperiencesMy work: 2023–2024

A shared VR simulation for leadership training, team development and psychological research.

Photon Fusion · Unity XR · Conversational AI

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First-person cleaning equipment overlooking RE:NEW/ALL's bright island ruins

RE:NEW/ALL

Lead ProgrammerHappy Volcano

A playable cleaning prototype with physics-heavy interactions and a world full of objects.

Unity physics · Prototyping · Performance

Playable prototype

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A selection of mobile game icons from the Gimica catalogue

JustPlay / Gimica

Unity C# SpecialistJustPlay / GimicaMy work: 2024–2025

One studio engagement across a portfolio of mobile games, building systems that teams could share.

Shared systems · Addressables · Mobile optimization

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A mech and players fighting in Megaweapon's colorful top-down arena

Megaweapon

Unity ArchitectBenevolent MegacorpMy work: 2021–2022

Real-time arena combat with multiplayer architecture, server authority and backend integration.

Photon Fusion · PlayFab · Authoritative servers

Past engagement

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Two meme characters facing each other in Meme Wars arena gameplay

Meme Wars

Unity Tech Director / Lead DeveloperYoyo Studio

Short arena duels with physics-driven combat, character abilities and deterministic multiplayer.

Photon Quantum · Deterministic PvP · Combat systems

In development

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JReact

Unity toolsOpen-source project

Reactive values, events and everyday gameplay utilities. Reusable pieces for building Unity systems.

C# · Unity · Reactive values

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Curious about the path here?

Earlier work & a little about me

Your next world.
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