WTS Java Services

[Duplexz]

Hello everyone!
 

I offer Java development services for L2-like projects.
 

I have been working with Java since 2015-2016. During the last years I worked on contract Lineage 2 server development and related infrastructure. My main focus is server-side Java, L2JMobius-based forks, custom systems, packets, datapack/XML, SQL/JDBC, optimization and fixing unstable logic.

 

Experience with:

• L2JMobius main/original branch;
• L2JMobius Essence branch;
• Lucera interlude;
• Custom L2-like packs where many things were already changed from the original codebase;

 

What I can help with:

• custom systems for your pack;
• skills / effects / triggers / formulas;
• NPC / AI / scripts;
• shops / services / buffer / GM shop logic;
• items / enchant / rewards / missions;
• special hunting zones, instances, spawn/zone logic;
• custom packets and server-side integration with existing client UI changes;
• server-side integration for existing client-side edits/maps/geodata;
• SQL/JDBC, XML/datapack, XSD, configs;
• porting mechanics between branches/chronicles;
• bug fixing, cleanup, legacy refactoring;
• performance fixes: memory leaks, race conditions, broadcast/task-manager bottlenecks.
• other server-side game mechanics;

 

Examples of larger systems I worked on:

• clan/economy systems: roles, permissions, auction, shop, warehouse, ranks, seasons, history;
• PvP/event-like systems: territory/conquest mechanics, rankings, rewards, schedules;
• hunt pass / season pass / progression systems;
• account panel / web API for a game project;
• launcher backend, token-login flow, updater tooling;
• parsers and analyzers for game/client data;
• internal testing tools for server-side validation.

 

I can work with Git, separate branches, commits, pull/merge requests or patches, depending on your workflow. For tasks I usually provide a short note about what was changed and what should be tested.

 

Format:

• hourly: 15-20 USD/hour, depending on the task;
• fixed price per task after checking the requirements/code;
• small task: from 15 USD;
• payment: USDT;
• no revenue share and no unpaid test tasks;
• a small paid task is usually the best way to check quality and communication first.

Contact:

• Discord: @stroke_dan
• Telegram @castirom

[alayahice]

On 5/13/2026 at 8:43 PM, Duplexz said:

Hello everyone!
 

I offer Java development services for L2-like projects.
 

I have been working with Java since 2015-2016. During the last years I worked on contract Lineage 2 server development and related infrastructure. My main focus is server-side Java, L2JMobius-based forks, custom systems, packets, datapack/XML, SQL/JDBC, optimization and fixing unstable logic.

 

Experience with:

• L2JMobius main/original branch;
• L2JMobius Essence branch;
• Lucera interlude;
• Custom L2-like packs where many things were already changed from the original codebase;

 

What I can help with:

• custom systems for your pack;
• skills / effects / triggers / formulas;
• NPC / AI / scripts;
• shops / services / buffer / GM shop logic;
• items / enchant / rewards / missions;
• special hunting zones, instances, spawn/zone logic;
• custom packets and server-side integration with existing client UI changes;
• server-side integration for existing client-side edits/maps/geodata;
• SQL/JDBC, XML/datapack, XSD, configs;
• porting mechanics between branches/chronicles;
• bug fixing, cleanup, legacy refactoring;
• performance fixes: memory leaks, race conditions, broadcast/task-manager bottlenecks.
• other server-side game mechanics;

 

Examples of larger systems I worked on:

• clan/economy systems: roles, permissions, auction, shop, warehouse, ranks, seasons, history;
• PvP/event-like systems: territory/conquest mechanics, rankings, rewards, schedules;
• hunt pass / season pass / progression systems;
• account panel / web API for a game project;
• launcher backend, token-login flow, updater tooling;
• parsers and analyzers for game/client data;
• internal testing tools for server-side validation.

 

I can work with Git, separate branches, commits, pull/merge requests or patches, depending on your workflow. For tasks I usually provide a short note about what was changed and what should be tested.

 

Format:

• hourly: 15-20 USD/hour, depending on the task;
• fixed price per task after checking the requirements/code;
• small task: from 15 USD;
• payment: USDT;
• no revenue share and no unpaid test tasks;
• a small paid task is usually the best way to check quality and communication first.

Contact:

• Discord: @stroke_dan
• Telegram @castirom
• Geometry Dash Lite

Welcome to the forum! Your skill list looks exactly like what I'm looking for. Since you mentioned doing small tasks to check quality first, could you drop your Discord/Telegram? I have a small custom system for an L2JMobius Essence pack that I need done. Let's talk.