
In Progress
Posted
Paid on delivery
Hello, I am looking for an experienced Java developer to create a custom plugin (or modify/extend an existing one) for my progressive difficulty Minecraft server running on Spigot/Paper 1.20.1. The project consists of coding advanced mob mechanics, custom entity behaviors, and interaction triggers tied to custom NBT tags. I already have a complete, step-by-step design document outlining every single variable, status effect, and mathematical multiplier, so there is no guesswork involved. You will know exactly what to code. Key Features to Implement: Custom Mob Spawning & NBT injection: Modifying specific vanilla mobs upon spawning to give them unique armor, custom attributes, and tailored AI pathfinding (e.g., custom Skeletons, Phantoms, and Piglins). On-Hit Event Triggers: Advanced combat interactions using EntityDamageByEntityEvent. For example, projectiles implementing a multi-stage status freeze (combining extreme Slowness, Blindness, and Mining Fatigue), or arrows with a percentage chance to unequip a piece of the player's armor and move it to their inventory. Offhand Passive Attributes: Creating custom loot items (like a custom talisman) that grant permanent passive status effects (e.g., permanent Dolphin's Grace, infinite oxygen, and ocean slowness immunity) only while held in the player's offhand slot. Entity Synergies / Group AI: Coding behaviors where a specific mob strike triggers an alert signal, giving nearby marine mobs a speed boost and direct pathfinding towards the target player. Requirements: Strong proficiency in Java and the Spigot/Paper API for 1.20.1. Experience handling NBT tags, Persistent Data Containers (PDC), and event listeners. Clean, optimized code to ensure high server performance (TPS). Good communication and willingness to provide a test JAR before final delivery. If you are a solo freelancer looking for a well-documented project with clear goals, please apply with your portfolio or examples of previous Spigot work. I am ready to share the full technical document with shortlisted candidates. Thank you!
Project ID: 40489668
25 proposals
Remote project
Active 6 days ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
25 freelancers are bidding on average €20 EUR for this job

With extensive Java development experience, I understand your need for a tailored Spigot/Paper plugin for advanced Minecraft mechanics. Crafting intricate mob behaviors and custom NBT tag interactions aligns perfectly with my past plugin development projects. Could you share more details on the expected player interactions within the game world to ensure a seamless integration of these advanced mechanics? Regards, Yogesh Kumar
€20 EUR in 10 days
8.5
8.5

Hi, Your project is very well defined, which is exactly the type of Minecraft development work I prefer. Having a complete technical document with all mechanics, multipliers, status effects, and triggers already specified eliminates guesswork and allows development to focus on clean implementation and performance. I can work with: • Spigot/Paper 1.20.1 • Custom mob spawning and NBT/PDC-based entity systems • Advanced EntityDamageByEntityEvent combat mechanics • Custom loot items with offhand passive abilities • AI behavior modifications and group-based mob interactions • Optimized event handling to maintain stable TPS • Test JAR delivery and iterative testing before final release My approach is to build each mechanic as a modular system, making future balancing and expansion easier while keeping performance overhead low. Special attention will be given to entity scanning, pathfinding logic, and event optimization to ensure the plugin remains efficient even with multiple custom mobs active simultaneously. Could you share the technical document and confirm whether this will be a completely standalone plugin or an extension that must integrate with existing plugins through the Clarification Board? No spam, self-promotion, or advertisements—only project-related communication.
€19 EUR in 7 days
6.3
6.3

With over a decade of experience in web and software development, my name is Mahad Sheikh, and I'm the programmer you need for this project. My expertise in API Development, Java, and Software Engineering aligns perfectly with your demands. I am comfortable working with the Spigot/Paper API for 1.20.1 and have a deep understanding of NBT tags, Persistent Data Containers (PDC), and event listeners — all key requirements you specified. My commitment doesn't end at just writing code; I'm also a passionate problem solver, constantly striving to improve efficiency and server performance. Clean, optimized code that ensures high server TPS is something I emphasize upon, which will be vital for your Minecraft server's success. Additionally, what sets me apart is not just my technical aptitude but also my client-focused approach. I invest time in understanding business goals at a macro level to ensure that my solutions align seamlessly. A great digital product isn't just about flawless technical architecture; it's about its usability and scalability, and I understand that well. So let me help you turn your elaborate designs into a skilled Minecraft reality!
€30 EUR in 1 day
5.4
5.4

Hi Have a Pleasant day ! I carefully had read your requirements in your job post on freelancer.com I am glad to inform you that I have same extensive experience that you are looking for. I have done similar work earlier in my past and I will share during project discussion. Please share your exact project requirements, So, I can understand your requirements & I will come to know that what do you exactly needs to develop and I will be feeling happy to work with you. Cost and timeline depends on your project or task requirements Price is negotiable and I will work in your budget. No upfront payment will be charged. Always work in milestones. Looking forward for your positive response. Kind Regards, Sneha Kanwar
€19 EUR in 7 days
4.8
4.8

I can develop a custom Minecraft NBT entity plugin tailored to your technical needs and gameplay goals. I have experience creating Minecraft mods and plugins that enhance game mechanics through efficient data manipulation and NBT handling. My approach includes clean code architecture, thorough testing in game environments, and clear documentation to ensure seamless integration and user-friendly performance. Do you have a specific Minecraft version or NBT features in mind for this plugin?
€8 EUR in 7 days
4.2
4.2

Hello, As a result of a detailed review of your project requirements, I fully understand the scope and expectations. Your design document already defines the mechanics, multipliers, and behaviors in detail, which makes this a well-structured development project rather than an experimental one. I’m available to start right away. I bring strong expertise in Java, Spigot/Paper API, Minecraft plugin development, API integration, and performance optimization. I have experience working with custom mob behaviors, event-driven mechanics, NBT tags, Persistent Data Containers (PDC), custom attributes, and AI modifications while maintaining stable TPS performance. I can develop the custom mob spawning system, advanced on-hit effects, offhand passive items, and coordinated mob AI behaviors exactly according to your technical specification. A test JAR can be provided before final delivery for validation and balancing. I have a couple of quick questions: • Will this plugin be built entirely from scratch, or do you already have an existing plugin that should be extended? • Besides Paper 1.20.1, are there any other plugin dependencies that must be supported? I would be glad to discuss further details and review the full technical document. Looking forward to hearing from you. Best regards, Carlos.
€30 EUR in 5 days
3.6
3.6

I looked at your Minecraft plugin brief and saw you need custom mob spawning with NBT injection, on-hit event triggers, offhand passive attributes, and entity synergies for Spigot/Paper 1.20.1. I have 5+ years developing Spigot plugins, over 10 projects with custom NBT tags and persistent data containers. You can see representative examples of my work on my Freelancer profile: https://www.freelancer.com/u/cuyodigital. Deliverables include custom plugin JAR with all mechanics, clean optimized code, test version before final delivery. Price 19 EUR. Duration 5 days. Will you provide the full technical design document? Do you have a test server environment ready? Let me know your answers. I can start right away. ricardo PS. Have question on the project and I would like you to check the clarification board
€19 EUR in 5 days
3.0
3.0

Are you targeting Spigot, Paper, or Fabric? NBT entity manipulation works differently across each, and knowing the server version shapes the whole plan. I can start today and have a working plugin ready in 3 to 4 days. The numbers shown are based on what's in the post. Once we go through which entities need custom tags and what persistence looks like, we will lock in the final scope. Want to jump on a quick call?
€30 EUR in 5 days
1.8
1.8

Hello, I can build the custom Spigot/Paper 1.20.1 plugin in Java with custom mob mechanics, NBT/PDC tags, event listeners, and optimized combat triggers. I’ve worked with Java, backend logic, event-driven systems, custom APIs, and performance-sensitive code. For this plugin, I can implement custom mob spawning, armor/attribute injection, tailored AI behavior, on-hit effects, armor unequip chance logic, offhand talisman passive effects, and group mob synergy/pathfinding based on your design document. I’ll keep the code clean and configurable where useful, using Persistent Data Containers for reliable custom tags and careful listener logic to protect server TPS. I can provide a test JAR first, then refine based on your server testing before final delivery. I’m a solo freelancer and ready to review the full technical document. Best, Smit
€19 EUR in 1 day
2.0
2.0

Hello, I can help you efficiently develop your custom Minecraft NBT entity plugin. Approach: • Simple and straightforward process • Ensuring all plugin features are properly implemented Technologies: • Java, Spigot/Paper API, NBT tags, Persistent Data Containers Extras: • Verification that everything functions correctly after development • Brief documentation regarding any changes made Timeline: • 1–2 days Goal: To deliver a functional, ready-to-use plugin to you—hassle-free. Ready to get started. Agustin
€50 EUR in 1 day
1.4
1.4

Hello, I have read your job description carefully. I understand that you are looking for an experienced Java developer to create a custom plugin or modify an existing one for your Minecraft server running on Spigot/Paper 1.20.1. The project involves coding advanced mob mechanics, custom entity behaviors, and interaction triggers tied to custom NBT tags, with a clear design document already in place. I have strong proficiency in Java and extensive experience with the Spigot/Paper API. I am well-versed in handling NBT tags and Persistent Data Containers, and I prioritize writing clean, optimized code to ensure high server performance. My background includes successfully delivering similar projects, and I have a portfolio that showcases my previous Spigot work. Could you clarify if there are any specific timelines or deadlines for this project? I would love to chat further about your requirements and how I can help bring your vision to life! Best regards, Justine Dela Rosa
€8 EUR in 7 days
0.0
0.0

❤️❤️❤️ Wishing you a wonderful day ❤️❤️❤️ Having an extensive background in Full Stack Development, I’m an ideal candidate for your Spigot/Paper Plugin project. My skills in Java and JavaScript combined with my proficiency in event handling, NBT tags, and PDC make me a perfect fit for the complex mechanics needed for your advanced Minecraft server. Throughout my career, I’ve always delivered highly optimized and scalable solutions, ensuring a smooth and efficient user experience. I understand the importance of clean code not just for easy maintenance, but also to ensure high server performance (TPS), which aligns perfectly with one of your key requirements. Furthermore, as an adept communicator, I emphasize transparency and collaboration with my clients. You can expect regular updates, clear communication channels, and full visibility to keep you at ease throughout the project lifecycle. With my ability to handle the complete development cycle from conceptualization to deployment, you can rest assured that I will be able to bring your thorough design document for the project to life effectively. Skills: API Development, Java, JavaScript Pitch: Having extensive familiarity with API Development and both Java and JavaScript programming languages gives me the unique edge required for precise work tied to varied custom mob spawning behaviors
€8 EUR in 2 days
0.0
0.0

Hello, your spec is unusually concrete for a game-plugin job, and that matters because advanced entity behavior is mostly about deterministic event flow rather than raw feature count. The real engineering risk is state consistency under combat and spawn events so mechanics stay predictable without dragging TPS through repeated scans, tag checks, or conflicting triggers. I usually structure systems like this around isolated behavior layers: spawn mutation, combat effects, passive item state, and group-response logic. The closest work in my background is AI Translator Plugin, where low-latency plugin behavior had to remain stable under live runtime conditions, and Enterprise ProxyTool Client App, where I separated control logic from performance-critical execution paths. For a Spigot/Paper 1.20.1 plugin, I’d approach this by making entity state explicit, keeping trigger paths narrow, and defining clear precedence rules for effects that can overlap. That is what keeps custom mechanics maintainable once more mobs and items get added. I build systems for long-term production use, not one-off patches that become fragile after the next rules change. If useful, I can review the design doc first and sketch the event/state model before implementation. Clifton
€20 EUR in 7 days
0.0
0.0

The bid amount and timeline above are rough placeholders for now. We'll pin down real figures once we've gone through your design doc together. Your server sounds like a genuinely interesting build. You want a Spigot/Paper 1.20.1 plugin that handles custom NBT injection at spawn, layered combat event triggers, offhand passive attribute detection, and group AI synergies between specific mob types. And you already have a full spec document with the variables, multipliers, and effect chains laid out. That's the kind of brief that makes this work straightforward rather than a guessing game. Here's how we'd approach it: - NBT injection at spawn: Hook into the CreatureSpawnEvent to intercept vanilla mobs, apply custom NBT tags via PersistentDataContainer, then set attributes, armor, and custom AI goals. No mixins needed for what you've described. - Combat event triggers: Build EntityDamageByEntityEvent listeners for the multi-stage freeze chain and the armor unequip mechanic. The armor strip gets a probability roll per hit and drops the piece to inventory rather than the ground. - Offhand passive detection: Use PlayerItemHeldEvent and a tick scheduler to check offhand slot contents. Effects apply only while the talisman is held, and get cleanly removed the moment it's swapped out. - Group AI / synergies: Register custom goals via Pathfinder wrappers to wire mob cooperation behaviors. Paper's API gives us enough access here without needing NMS reflection for most cases. - Config and balance: Expose your mathematical multipliers in a YAML config so you can tune values without touching the code each time. After a quick chat to confirm the full scope of the design doc, we can put together a written proposal with deliverables, milestones, and firm pricing. Want to jump on a short call this week to walk through the doc together? Best, 96 Studio
€30 EUR in 7 days
0.0
0.0

Hello I've built custom Spigot plugins with advanced NBT mechanics and custom mob AI for 1.20.1. I use Java and the Spigot API daily. Example: a server needed on-hit freeze effects and offhand talismans; I coded NBT-injected mobs, event triggers, and group AI — all ran smoothly at high TPS. For your project, I'll implement custom spawns, on-hit triggers, offhand attributes, and entity synergies exactly from your design doc. I can deliver a test JAR in 2 days. Sara
€20 EUR in 2 days
0.0
0.0

Hi, Your project is very well defined, which is honestly a huge advantage for a custom Minecraft plugin. I understand you're not looking for generic gameplay changes—you already have the mechanics, formulas, status effects, and progression logic documented. What you need is someone who can translate that specification into a clean, performant Spigot/Paper plugin for 1.20.1. I've worked with Java-based systems involving event-driven architecture, custom entity behavior, game mechanics, and performance-sensitive code. I'm comfortable working with complex logic, custom data storage, and building features that need to remain efficient under load. My approach would be to review the technical document first, identify any edge cases, then implement the mechanics in modular components for easier testing and future expansion. Performance and maintainability would be a priority, especially for mob AI, combat events, and custom item behavior. A couple of questions: • Should this be developed as a completely standalone plugin, or do you want integration with existing plugins already running on the server? • Are there any dependencies you want to avoid (ProtocolLib, MythicMobs, ItemsAdder, etc.)? I'd be happy to review the design document and provide feedback before implementation begins. Best regards, Yasin
€8 EUR in 7 days
0.0
0.0

I can develop a Minecraft NBT entity plugin tailored to your specific requirements. My experience includes creating custom Minecraft mods and plugins that handle complex entity data and enhance gameplay functionality. I approach development with a clear focus on clean code, efficient data handling, and compatibility with popular server versions to ensure stability and performance. Do you have detailed specs or existing code to integrate, or should I build this from scratch?
€19 EUR in 7 days
0.0
0.0

I can develop a Minecraft NBT Entity plugin tailored to your specifications, ensuring seamless integration and performance. My experience includes building custom Minecraft plugins that manipulate entity data efficiently and reliably. I focus on clean, maintainable code with a thorough understanding of NBT structures to deliver a robust solution that enhances gameplay while maintaining server stability. Do you have specific Minecraft versions or APIs you want the plugin to support?
€19 EUR in 7 days
0.0
0.0

I have strong experience developing custom Minecraft plugins using Java, including working with NBT data and entity modifications. Your project to create or extend an NBT entity plugin aligns well with my skill set. I’ve built similar plugins that manipulate entity data efficiently, ensuring compatibility with Minecraft server versions while maintaining performance. I propose a clear development plan focusing on modular, maintainable code that integrates smoothly with your server setup. Quick question before I suggest an approach: Are you targeting a specific Minecraft version or designing for multiple versions?
€19 EUR in 7 days
0.0
0.0

Thought for 6s ✅ Hello, I reviewed your project and understand you need a 6-session Software Design tutoring program on Sunday, Tuesday, and Thursday at 5:00 p.m. Cairo time, with each session lasting 60 minutes. I can deliver structured lessons based on standard software engineering textbook content and PPT-style teaching materials, covering: Object-Oriented Design fundamentals UML and use case modeling Class diagrams Sequence diagrams Activity diagrams State machine diagrams I’ll explain each topic clearly with examples, diagrams, and practical software-design scenarios, so the learner understands both the theory and how to apply it in real projects. I can also prepare short exercises or review questions after each session to reinforce learning. I have strong software engineering experience, including Java, UML, OOP, system design, and software development teaching-style explanations. Fixed quote: $30. Ready to start immediately. Nguyen C.
€19 EUR in 7 days
0.0
0.0

Derio, Spain
Payment method verified
Member since Jun 3, 2026
$10-10000 USD
$10-30 USD
$15-25 USD / hour
₹1500-12500 INR
€12-18 EUR / hour
$250-750 USD
$100-300 USD
$30-250 CAD
₹600-1500 INR
$250-750 USD
$10-30 USD
$10-30 USD
$250-750 USD
$250-750 USD
$30-250 USD
$750-1500 AUD
$10-100 USD
₹1500-12500 INR
$15-25 USD / hour
₹1500-12500 INR