Systems & Gameplay EngineerOpen to work

I build the live systems that keep multiplayer worlds running.

Levii Soderberg — a systems engineer working in the plumbing of live multiplayer games: authoritative netcode, custom RPC protocols, state replication, and persistence. Shipped as 11 DayZ server mods running on live communities.

View the work Download résumé GitHub

11: shipped mods
241+: source files
23K+: lines in flagships

Selected work

Three flagship systems

Each shipped and running on live DayZ servers. Read them two ways — the game story, and the engineering any systems team will recognize.

Distributed systems120 files · 10K LOC

Project SHD

A hardcore tactical-faction server experience — a force-equipped smart-watch, a bank-hacking heist economy, and the distributed-systems plumbing to keep it consistent.

Enforce Script
ScriptRPC
NetSync
JSON persistence
Component UI

In game: Project SHD turns a DayZ server into a hardcore tactical-faction experience. Every player is bound to a non-removable smart-watch that mirrors their identity, group, and in-game bank balance. Players can scan other watches, decrypt the watches of the dead, and pull off a bank-hacking heist — draining a slice of a rival's account on a cooldown. It layers in a group-hash storage lock, synced safezone music, a custom notification system, and a pack of survival QoL features.
Underneath: Authoritative client/server architecture with untrusted clients · Custom RPC / message-protocol design · State replication & reconciliation

Read the case study

Systems architecture51 files · 11K LOC

Contracts

A group-based contracts, quests, and server-events economy — five contract types and nine world-altering events, built on a polymorphic factory and a state machine.

Enforce Script
RPC opcodes
State machine
Factory pattern
JSON persistence

Read the case study

Applied CS15 files · 1.6K LOC

PvEvP

Configurable PvE safe-zones carved into a PvP map — an authoritative damage model, computational-geometry containment tests, and a live in-game zone editor.

Enforce Script
Computational geometry
Custom RPC
Schema migration

Read the case study

DayZ · Enforce Script

Built framework-first, not one mod at a time

Beyond the flagships, a suite of server mods that share one foundation. For a studio like Bohemia this is the specialist signal; for everyone else it's the same discipline — clean architecture, reused across a product line.

The foundation

SyntactixCore

The shared framework the other mods plug into — a service registry with fanned-out lifecycle hooks, unified events, and standardized storage. Every mod below registers as a service and inherits its lifecycle, events, and storage from one place — the difference between a pile of scripts and a platform.

How the framework works

Gameplay system17 files

SurvivorMissions 2

A dynamic mission system spawning Kill / Delivery / Defend objectives with AI, reward crates, and audio cues.

Details

Anti-exploit4 files

Logout Blacklist

Stops combat-logging with high-value raid loot — force-drops blacklisted items on disconnect.

Details4.7K+ subs

Performance7 files

Automatic Car Cover

Converts idle vehicles into camo-net objects to cut server entity and persistence load.

Details4.5K+ subs

Anti-exploit9 files

RaidGuard

Temporary no-build lockdown zones around breach events to stop instant re-walling.

Details

Balancing6 files

AirdropLimiter

Caps how many airdrop flares a group can call per server restart.

Details

Server policy3 files

GroupOnlineLimit

Enforces a maximum number of concurrently online members per group.

Details

Scheduling4 files

GroupRegulation

Locks group-switching to scheduled raid windows.

Details

9.5K+current subscribers

21K+all-time installs

Browse all on Steam

Pulled live from the Steam Workshop · updated daily

Capabilities

What I bring to a team

Grouped so a studio and a generalist team can both find what they need.

Languages

What I write systems in.

Enforce Script
Python
TypeScript / JavaScript
SQL

Systems & Networking

The engineering that actually ships in my mods.

Authoritative client/server architecture
Custom RPC & message-protocol design
State replication & reconciliation
Serialization & versioned persistence
Eventual consistency & retry logic
Computational geometry / spatial queries
Finite-state machines
Performance & entity-lifecycle management

Patterns & Practice

How I keep large codebases sane.

Factory & polymorphic design
Service-registry / plugin architecture
Data-driven / config-first design
Open/closed extension & load-order layering
Event-driven architecture

Tools

The workbench.

Git
DayZ Tools / Workbench
JSON config pipelines
VS Code
Next.js / React

Currently deepening

Working through the Backend Engineering track on boot.dev to put formal foundations under the systems work I already ship — currently focused on Python, with HTTP servers, databases, and system design ahead.

Python
boot.dev · Backend Engineering
APIs & servers
Databases

Completed

About

Hi, I'm Levii.

I'm a self-taught systems engineer who ships live multiplayer game systems. Over the last few years I've built and released 10+ server mods for DayZ — used on live servers by real player communities — spanning netcode, persistence, economies, and reusable frameworks.

What I actually do is distributed-systems engineering wearing a game-dev jacket: authoritative client/server architectures, custom RPC protocols, state replication, versioned data persistence, and making unreliable third-party dependencies behave. I care about the invisible plumbing that makes a world feel solid.

I'm now looking for a role where I can bring that systems mindset to a team — in games or beyond.

11mods shipped

United Statesbased in

Availablegameplay / systems / backend engineering roles

Contact

Let's build something solid.

Hiring, collaborating, or just curious about the systems behind the mods — I'd like to hear from you.

levii.soderb@gmail.com