James Hall
James Hall

Merseyside, UK

James Hall

Java Developer · Backend & Game Server Infrastructure · Java, Kotlin, Docker, SQL

I build backend systems and game server infrastructure in Java and Kotlin. Currently working full-time on MineBounds at SSundee LLC.

About

I'm a Java developer working full-time on MineBounds, SSundee LLC's multiplayer Minecraft network. I build the features players see and the infrastructure that runs them, and I take features from the first conversation about an idea through to testing, release and monitoring.

I'm self-taught and have been writing software professionally since 2023. Before SSundee I freelanced for 15+ clients, most of whom came back, and built or contributed to open-source mods with over 1.8 million downloads.

Day to day I work in Java, Kotlin, SQL, Docker and Linux, with AI-assisted tools as part of my workflow.

Experience

Java Developer SSundee LLC

Aug 2025 to present · Contract · Remote

  • Build player-facing features in Java and Kotlin for MineBounds, SSundee's multiplayer Minecraft network, from in-game systems and interfaces to the services behind them.
  • Built custom Minecraft mods in Java for videos on the SSundee YouTube channel.
  • Main developer on a feature area, taking work from design to release and working directly with non-developers to turn ideas into requirements.
  • Improved server tick rate, memory usage and database query speed, using profilers, logs and dashboards to find the cause.
  • Build and run the server's infrastructure: Docker-based game servers, plus builds, releases and deployment of the server and its custom plugins.
  • Built monitoring and analytics for server health and player activity, including the SQL behind it.
  • Write unit and integration tests, review code on GitHub and document what I build.

Freelance Software Developer Self-employed

Sep 2023 to Aug 2025 · Remote

  • Delivered custom Minecraft mods in Java for 15+ clients, including content creators, server networks and small studios. Most came back for more work.
  • Ran the business side myself: quoting, invoicing and hitting deadlines.
  • Built or contributed to open-source mods with 1.8M+ downloads, some still generating revenue.
  • Wrote my own build and release tooling to ship mods across multiple game versions and mod loaders.
  • Partnered with BisectHosting, a game server host, to promote their services to my mods' players.

A-levels KGV Sixth Form College

Sep 2024 to Jul 2026

Mathematics, Computer Science and Physics.

Work

Open-source mods I built or contributed to. Counts combine Modrinth and CurseForge.

Downloads
1.9M+
Projects
30
Clients
15+

Summit A-level Computer Science coursework

C# · .NET · MonoGame

  • A mathematical deck-building roguelike where players build equations from cards to hit a target score.
  • Wrote SummitKit, the reusable MonoGame framework behind it, covering input, UI, audio, scenes, physics and rendering.
  • Implemented an expression resolver with three scoring modes, seeded rounds, save/load and a developer console for testing.
  • Produced full design documentation and system diagrams.
All projects

Skills

Languages
Java, Kotlin, C#, SQL, JavaScript, Python
Infrastructure
Docker, Linux, Pterodactyl, Grafana, ClickHouse
Tooling
Git, GitHub, Gradle, IntelliJ IDEA, Bash
Platforms
.NET, MonoGame, Fabric, NeoForge
Practices
Unit and integration testing, debugging and profiling, code review, AI-assisted development

Contact

Email is the best way to reach me.

duzo on Discord @duzo.

README