Available for remote employment and contract work

Backend systems that hold up when people rely on them.

I'm Jace Sleeman, a backend and full-stack engineer building real-time products, public APIs, and the infrastructure behind them.

View selected work Download resume Contact me

Rutledge, TennesseeRemote onlyGitHub

6+years building software professionally

4,000peak concurrent players supported

10MAPI requests served monthly

Livesystems used by real communities

Selected work

Production context, not demo projects.

I choose work that shows the decisions behind dependable software: state, throughput, integrations, operational ownership, and a clear product surface.

Production engineering / 2025 - present

Complex Gaming

Building and operating player-facing systems for a multiplayer network that reaches roughly 4,000 peak concurrent players.

Work spans real-time gameplay features, persistent state, live deployments, production debugging, and performance work across a distributed game-server environment.

StackJava, SQL, Redis, Paper, Velocity, distributed systems

Scale~4,000 peak concurrent players

Visit Complex Gaming

Public API / Node.js

McHeads API

A self-hosted REST API that generates Minecraft player heads, avatars, and full-body renders for Java and Bedrock editions.

Built with Express, image-processing pipelines, upstream Mojang and GeyserMC integrations, request validation, and SQLite or PostgreSQL-backed caching.

StackJavaScript, Node.js, Express, SQLite, PostgreSQL, REST

Scale~10M requests served per month

View source

Cross-platform product / Open source

Noteriv

A markdown knowledge workspace with local-first storage, sync, a plugin API, and an MCP server for AI-assisted note operations.

The product combines a Tauri desktop app, Rust native layer, Next.js renderer, web clipper, MCP server, and mobile companion into one open-source system.

StackTypeScript, Rust, Tauri 2, Next.js, React Native, MCP

Scale78 GitHub stars, 14 forks

View source

Developer tooling / Desktop application

ImgPlayGround

A native desktop control room for image generation across six providers, with bulk runs and local, Git-tracked storage.

Designed as a practical workflow tool that keeps provider access and generated output under the user's control instead of inside a browser-only service.

StackTypeScript, Rust, Tauri 2, React, provider integrations

ScaleSix image-generation providers

View source

Experience

Close to the runtime.

Sep 2025 - Present

Software Developer Complex Gaming

Own and ship features in a live multiplayer environment, where debugging, deployment discipline, performance work, and player impact are part of the job.

2019 - 2025

Freelance Software Developer

Delivered custom systems and operational tooling for online communities, from persistent data workflows to gameplay and administration features.

Technical capabilities

Tools follow the problem.

01Backend and APIs: Java, JavaScript, TypeScript, SQL, REST APIs, public API design
02Frontend and product: React, Next.js, desktop applications, product workflows, accessible interfaces
03Data and caching: PostgreSQL, MySQL, MongoDB, Redis, persistent state, cache design
04Infrastructure and tooling: Docker, Linux, Bash, Git, Gradle, Maven, deployments and debugging
05Real-time systems: Paper, Spigot, Bukkit, Velocity, BungeeCord, NMS, ProtocolLib

About

I learned by shipping systems people actually used.

Since 2019, I've built software in environments where latency, data integrity, and a bad deploy are immediately visible. That experience shaped how I work: understand the system, make the smallest reliable change, observe the result, and leave the codebase clearer than I found it.

Contact

Have a remote engineering role or a system worth improving?

jacesleeman603@gmail.com LinkedIn GitHub

Rutledge, TN. Available remotely for full-time roles and contract work.