Best Java Jobs & Projects

We are seeking an experienced website developer to create and maintain dynamic websites tailored to our clients' needs. The ideal candidate should have a strong understanding of front-end and back-end development, be proficient in responsive design, and be familiar with CMS platforms. You will work closely with our design team to bring innovative ideas to life. If you have a passion for coding and a keen eye for detail, we want to hear from you!

We’re a residential real estate team. We need a Google Sheets specialist to build a searchable database of local homebuilders’ communities and floorplans, plus a custom Google Apps Script “Search” form that:

Accepts agent‑entered criteria (beds, price range, school zone, etc.)
Runs a dynamic query on our master data sheet
Writes the matching results into a brand‑new “Search Results” tab, ready for printing, sharing, or further analysis

Key Responsibilities

Design a clear, normalized Google Sheets data model with:
One tab per builder + a master summary tab
Defined columns for community info and floorplan features
Develop a Google Apps Script–powered custom menu and HTML sidebar form where agents enter search criteria
Implement server‑side script logic to:
Build and execute a QUERY() based on form inputs
Create or clear a “Search Results” sheet
Populate that sheet with the filtered rows
Ensure the “Search Results” sheet is formatted for easy printing/export (headers, column widths, basic styling)
Write concise user documentation (1 page) on how to:
Add new builders/communities/plans
Run or modify the search form
Export or print results

Deliverables

Fully functional Google Sheet with data tabs and master summary branded to my team
Custom “Search” menu and HTML sidebar search form
Automated creation and population of a “Search Results” sheet on each query
One‑page user guide (Google Doc or PDF)
Snippet to export “Search Results” as PDF to Google Drive or email

We are looking for an experienced programmer to help us fix issues in our existing 2-4 tree implementation. The ideal candidate should have a solid understanding of data structures and algorithms. You will be responsible for debugging the code, optimizing performance, and ensuring all functionalities work as intended. This is a critical task that requires attention to detail and strong problem-solving skills. If you are passionate about coding and have previous experience with tree data structures, we want to hear from you!

Hello,

I hope this finds you well.

I’m seeking a skilled Wordpress developer to create a responsive news-based website using an established theme. I have references, but equally open to suggestions.

What I Have Already

Domain Name
Host
Specific Theme References
A Strong Sense of Visual Identity for the Site (eg color palettes etc)

What I Need

Install Wordpress.org on host

Point Domain to Website

Primary Site Areas
- Homepage
- Article Template
- Page Template
- Search Result Template
- (After homepage, numerical pages: page, page 3, page 4)

Custom URL structures for different article types. For example:

Customise the theme where need be.

Very specifically need to signify key spots to include advertisements java. Placement sizes include 300x250, 728x90, 320x50, These areas ought to be easily accessible / amendable.

I have a very specific vision for how I’d want the site to look. So, while I will be sure to provide as much info as possible ahead of time, I’d be grateful for flexibility re amends. My ideal style of working is flexible, on the fly amends (within an agreed / respectable timeframe). Rather than a 2-3 opportunities to tweak.

Note: While open to using things like elementor and similar to build / customise the site, I’m keen to have the ability to tweak amend things via traditional HTML. Pretty sure this should easily be doable via Wordpress backend. But just want to flag at this juncture.

I politely require a quick turnaround (24/48hrs max).

I look forward to hearing back from you.

Budget is quite limited. Keen to collaborate with well-aligned developer nonetheless.

If interested and immediately available, please reply with:

* Proposed cost for job
* Any news site template you may work with (not a must, but helpful)

I look forward to hearing back from you.

Thanks!

Sam

We are seeking a skilled freelancer to integrate the signature functionality of the Easysign application with our existing RFP application hosted on our platform. The ideal candidate will have proven experience with electronic signature applications and API integrations. Your work will ensure seamless signing capabilities within our RFP processes, enhancing user experience and efficiency. If you have a strong background in application integration and electronic signatures, we want to hear from you!

• Describe your recent experience with similar projects
• Include a link to your GitHub profile and/or website
• Describe your approach to testing and improving QA

We are seeking an expert full stack developer to create dynamic UIs using javascript frameworks, APIs in Node with Copilot with backend in PostgreSQL, and N8N for workflow automation hosted on Railway. The ideal candidate should also have extensive experience with Google Scripts and also web scraping using Selenium. Be proficient in integrating various technologies for seamless functionality. You will be responsible for building robust and user-friendly applications while ensuring optimal performance. If you have a passion for innovative solutions and can deliver high-quality results, we would love to hear from you!

Phase 1 – Work OS = Notion Dashboard System ($500)
A clean, repeatable setup to track client progress, ROI, tasks, and onboarding.

What’s included:
- Internal dashboard (projects, content, notes)
- Client dashboard template (progress, ROI, action plan)
- Onboarding checklist
- Built to duplicate easily for each new client
- Loom walkthrough + 1 revision
- Optional add-ons later

We're looking for developers to help build an animal detection and mapping app for DJI aircraft. The build includes:

A robust Android app using DJI’s Mobile SDK (v5)

A real-time YOLOv8 livestock detection pipeline

A simple, reliable mapping interface showing animal locations

Optional integration with DJI’s Payload SDK to trigger sirens mid-flight

Ideal experience:

Android development (Kotlin/Java)

DJI SDKs (MSDK, PSDK)

TensorFlow Lite or ONNX mobile inference

Google Maps SDK or equivalent mapping tools

Familiarity with edge computing or embedded AI (bonus)

I’m a backend engineer with 6 years of professional experience, primarily working with Java and Spring Boot. Over the years.

I’m now looking to take my engineering craft to the next level. I’m seeking a strong, experienced Java mentor** who can help me deepen my knowledge in the following areas:

* Advanced Java features (records, virtual threads, sealed classes, functional programming)
* Clean architecture and domain-driven design (DDD)
* High-performance, scalable systems
* Distributed systems and event-driven design
* Code reviews, design feedback, and pair programming
* Best practices in testing, observability, and system design interviews

**Ideal mentor profile:**

* 10+ years of experience in backend development
* Deep expertise in modern Java (17/21), concurrency, design patterns, and Spring ecosystem
* Experience mentoring or leading engineering teams
* Comfortable with pair programming, code walkthroughs, and design sessions
* Available 4–6 hours per week for live sessions and async code review

If you are passionate about clean code, distributed systems, and want to help a fellow engineer grow—I'd love to connect!

---
Please bid and let me know what is fair!
Let me know if you want a more casual or more technical version depending on where you're planning to post this.

Social Media Management software with unique quirks.

Can you message me please I need help with code

We are looking for an experienced Full-Stack Developer to help modify and enhance our existing web application, which is built using: Java Spring Boot Microservices ,Apache Kafka, Angular (Frontend)
The project involves backend logic updates, microservice communication enhancements, Kafka stream handling, and UI/UX modifications in Angular to improve performance and user experience.
Key Responsibilities:
- Modify and maintain Spring Boot microservices logic and REST APIs
- Handle and enhance Kafka producers/consumers for real-time data flow
- Improve existing Angular components for better UI/UX
- Debug, test, and deploy enhancements without breaking current functionality
- Collaborate with our team to align features with business goals
Requirements:
- Proficiency in Java 11+/Spring Boot
- Hands-on experience with Apache Kafka (topics, partitions, consumers/producers)
- Strong Angular knowledge (v10+ preferred)
- Understanding of Microservice architecture and RESTful APIs
- Familiar with tools like Postman, Swagger, Git, etc.
- Ability to read and work within an existing codebase
- Clean, well-documented code with attention to scalability
Bonus Skills (Not required but a plus):
- Docker/Kubernetes experience
- Working knowledge of CI/CD pipelines
- UI/UX sense for improving frontend flow

• Describe your recent experience with similar projects

1. Project Overview

We have an existing, production‑grade Keycloak OAuth 2.0 server running on a single VM (with PostgreSQL on the same VM). We need to add only the UMA 2.0 protection and authorization‑grant functionality—no other changes to realm structure, user federation, theming, etc.

2. Scope of Work
* Upgrade our current Keycloak realm to support UMA 2.0 grants.
* Configure a “protected resource” in Keycloak.
* Implement the UMA permission endpoint and token‑exchange flows.
* Deliver three demo clients showing the end‑to‑end flow:
1. Resource Server (registers resources & scopes)
2. Resource Owner (requests permission)
3. Client (exchanges a permission ticket for an RPT)

3. Deliverables
1. Realm Configuration
* Exported JSON of the updated realm (UMA settings enabled).
2. Client Configurations
* Three client‑definitions (as JSON or via CLI script).
3. Step‑by‑Step Guide
* How to deploy the realm export, import the clients, and run the demo.
4. Test Plan & Scripts
* cURL collection that:
* Registers a resource and scope
* Obtains a permission ticket
* Exchanges ticket for an RPT
* Accesses the protected endpoint with/without RPT

5. Success Criteria
* A Keycloak realm that responds to UMA 2.0 calls as per RFC 8630.
* Demo clients can:
* Trigger a 403 when calling the protected resource without permission.
* Obtain an RPT via the UMA endpoints.
* Successfully call the resource with a valid RPT.
* Clear documentation so anyone on the team can reproduce the flow.

Logistics
* Environment: Single GCP (or on‑prem) VM, PostgreSQL on VM
* Timeline: 1–2 weeks for milestone 1 (UMA enablement + demos)
* Budget: Fixed‑fee for this milestone, with follow‑on work possible

Integration requirements are straightforward.
Our customer wants to sell one of our products on their Shopify site. We need to consume data from Shopify and load sales order to a single NetSuite customer record. From there we will fulfill, ship, and bill. No need to synch available inventory metrics as we have unlimited quantity on hand.
We initially wanted to integrate Shopify and NetSuite without any middleware. However, our customer’s preference it that we use Order Desk.
We will only need someone to integrate our Order Desk instance with NetSuite. Our customer’s developer will handle integrating OD with their Shopify page.
The ideal candidate should have a robust understanding of NetSuite functionalities and OrderDesk integration methods.
If you have a proven track record in similar projects, we would love to hear from you!

Hello
- I have Ready -made applications(.aab.file.), but i don't have an any google play console account.
-I have 4 android application built in java/kotlin language and I want to upload it in your Gp Console.
- 12 $ = 4 Apps.

Requirements:
- Play Console Developer Account
- Console Access

- Important Note :-
- Every Month Rent :- 50$
- Rent will increase by 10% every month from the 2nd month until the app remains live.
- all app live after company approve contract and release full payment .

We are looking for an experienced Data Engineer to help us develop, optimize, and scale complex data processing pipelines and analytics systems that support both batch and real-time use cases.

Your key responsibility will be building foundational data infrastructure for our Fraud Analytics platform, with a strong focus on developing a Knowledge Graph using AWS Neptune or Neo4j.

• Describe a complex data processing pipeline you've built using Apache Spark on AWS EMR. What was the business context, what were the key design choices and trade-offs, and how did you overcome technical challenges?
• Provide a detailed example of how you've implemented data validation or reconciliation in a production pipeline. What were the tools, logic, or patterns you used?

I need to find out by cyber security professional what is going on in the background of my mobile devices and stop any attack

Only immediate joiners
Only freelancers
No agencies
Dual employment is not allowed

QA Automation

Location: Remote
Contract Duration: 12 Months extendable

Job Description:
The candidate should have 5 + years of experience in the field of IT with a focus on QA and testing of web-based applications. He should have good experience in Functional Testing, API Testing, Database Testing, Black-Box testing, Regression testing, Smoke testing and Ad-hoc testing. Also, will be responsible for searching, investigating, reporting, and tracking software defects. Develop Test Strategy, Test Plan and Project Estimation and review with Business Team. Responsible for identifying, analyzing, measuring, and managing project risks. Ensuring timely delivery and timely communication of status reports and test reports to Business team. Strong troubleshooting and Problem-solving skills.

Responsibilities:
• Design test plans, write test cases, review functional requirement documentation.
• Participate in QA function of the web platforms, including Systems and Integration Testing, Regression Testing, Performance and Load Testing, Compliance Testing
• Design and create automation test cases to perform QA tasks such as system integration, data validation, load testing and performance testing.
• Perform root cause analysis to identify problems in design and/or implementation.
• Make decisions in day-to-day operations, proactively raising issues with managers when necessary.

Qualifications:
• 5 + years of experience in the field of IT with focus on QA and testing of web-based applications.
• A keen analyst with thorough understanding of requirements, translating them into test cases and driving their execution.
• Good experience on web applications testing.
• Experience in API testing and using performance test tool.
• Good experience in Functional Testing, Black-Box testing, Regression testing, Smoke testing and Ad-hoc testing.
• Extensive experience in Client interaction, Requirement Gathering, Issues Clarification during entire SDLC and deriving the Test Scenarios/Conditions based on the Requirements.
• Professional experience in deriving the Test Scenarios and designing the manual test cases.
• Experience in generating test data and preparing weekly status reports, Test Estimation.
• Ability to work on multiple projects concurrently and meet deadlines individually or a team.
• Experience in writing SQL complex queries (MS SQL Server, Oracle), Database testing.
• Strong Knowledge of developing Java in Selenium Web-driver & Experience in Designing and executing the automation scripts using Selenium-WebDriver.
• Interacted with client to have a better understanding of functionality.
• Develop Test Strategy, Test Plan and Project Estimation and review with Business Team.
• Responsible for identifying, analysing, measuring, and managing project risks.
• Ensuring timely delivery and timely communication of status reports and test reports to Business team.
• Strong troubleshooting and Problem-solving skills.
• Ensuring timely delivery and timely communication of status reports and test reports to Business team.
• Strong troubleshooting and Problem-solving skills.
• Understanding in basic Unix commands.

• Are you a freelancer or an agency or working as a full time employee in a company ?
• Please attach your cv with project details to review.
• This is a 12 month extendable contract. Are you fine with it ?
• How much experience do you have in Automation Testing (Selenium + Java) ?
• What is your total experience ?

We are expanding our communications product line and need a hands‑on developer who can design, build, and maintain VoIP services powered by Asterisk, develop high‑performance backend code in Python, and integrate cloud telephony features with Twilio and Telnyx. You will work directly with product managers and senior engineers, delivering end‑to‑end features and helping us launch reliable, scalable calling solutions.
Key Responsibilities
VoIP & Asterisk
Design dial‑plans, IVRs, call routing, SIP trunking, and monitoring
Optimize performance, security, and high availability of the Asterisk stack


Backend Development (Python & Java)
Build micro‑services, REST/gRPC APIs, background workers, and data pipelines
Write clean, testable, well‑documented code


Telephony Integrations
Implement voice and messaging flows using Twilio and Telnyx APIs (Programmable Voice, Messaging, Webhooks, etc.)


Quality & Delivery
Understand current code base, and build new features.
Deliver features on aggressive timelines with minimal iterations
Must‑Have Skills
2+ years building or maintaining production VoIP systems with Asterisk / FreePBX / FreeSWITCH
2+ years developing scalable services in Python (FastAPI, Flask, Django, or similar)
Hands‑on experience with Twilio and/or Telnyx APIs for voice and messaging
Solid SQL skills
Proficiency with Git and modern CI/CD pipelines (Docker, GitHub/GitLab, Jenkins, etc.)
Nice‑to‑Have
Node.js for ancillary services
Cloud deployment on AWS or GCP (EC2, Lambda, S3, IAM, CloudWatch)
Front‑end basics (React or plain JavaScript) for simple dashboards
Familiarity with Jira, Confluence, and Agile delivery practices

We’re looking for an experienced Android developer to help us maintain and improve our visitor check-in app used on Elo Android kiosks at healthcare facilities.

About the App:
Runs on Elo Android touchscreens in kiosk mode

Visitors enter their phone number to check in

If recognized → auto check-in

If not → prompted to enter First/Last Name, optional Email, and who they're visiting

Check-out is done via phone number

10 minutes later, an SMS and Email is triggered requesting a review

Backend:
Built with Node.js + React

Tracks check-in/check-out logs

Sends automated review messages

We Need Help With:
Debugging frequent freezing/crashing issues on Elo devices

Reviewing the Android codebase for memory leaks or poor lifecycle handling

Improving kiosk mode stability

Diagnosing issues in the backend communication

Ensuring proper logging and performance

We are seeking a skilled developer to help us connect the backend and database of our app built on AI Studio. The ideal candidate will have experience in integrating backend systems with databases, ensuring seamless data flow and functionality. You will work closely with our team to understand the existing architecture and implement the necessary changes to enhance performance and reliability. If you have a strong background in app development and database management, we would love to hear from you!

Hello

i need android app developer my app task i have 3 apps all apps are developed and tested, all files are ready, for upplod
i want long term cooperation with upplod app task

lets discuss more

Thanks

We are seeking an experienced Android app developer to assist us in publishing a developed app library on a private Maven repository. The ideal candidate will ensure that the library is properly configured and accessible for our clients to use in their projects. Your proficiency in Maven and Android development is critical for this task. If you have a strong track record of similar projects, we would love to hear from you!

Role Description:
We are looking for an AI Engineer with a strong foundation in software development and practical AI/ML experience. This role is ideal for candidates who have spent 3-5 years in professional software development with established tech companies (e.g., Wipro, Infosys, TCS, or similar) and have 1-2 years of hands-on AI development experience.
As part of our AI team, you will design, develop, and deploy AI models and solutions with a focus on pattern recognition, neural networks, and natural language processing. You’ll collaborate with cross-functional teams to integrate AI into real-world products while staying current with evolving AI trends and technologies.

Key Responsibilities:
- Design, develop, and implement AI/ML models and algorithms
- Work on projects involving Pattern Recognition, Neural Networks, and NLP
- Collaborate with software engineers, designers, and product teams to integrate AI solutions
- Troubleshoot, test, and refine AI models for performance and reliability
- Stay updated on AI advancements and contribute to continuous improvement
- Ensure high-quality code and development standards

Required Qualifications:
- 2-4 years of professional software development experience with reputable tech companies (e.g., Wipro, Infosys, Cognizant, TCS, product companies, etc.)
- 1-2 years of practical AI/ML development experience, including working with real-world AI projects
- Solid foundation in Computer Science, Software Development, and Algorithms
- Hands-on experience with Python (preferred) or Java for AI/ML projects
- Exposure to NLP techniques, Neural Networks, and Pattern Recognition
- Familiarity with popular AI/ML frameworks (e.g., TensorFlow, PyTorch, scikit-learn)
- Strong problem-solving abilities and attention to detail
- Bachelor’s or Master’s degree in Computer Science, Engineering, or related field

Nice to Have:
- Experience working in Agile, remote development teams
- Knowledge of Generative AI, LLMs, or modern AI trends
- Familiarity with cloud platforms (AWS, Azure, GCP) for AI deployment
- If you're looking to build AI solutions that make real business impact and want to work with a team delivering projects to global clients, we'd love to hear from you.

I’m looking for a skilled and reliable AI software developer to work with me on a short-term, job-by-job basis. The main focus is on AI-powered calling services, such as automated voice assistants, outbound/inbound AI calls, and API-based integrations.

Requirements:
• Experience with AI voice tools (e.g., Twilio, ElevenLabs, Whisper, or similar)
• Able to work flexibly and respond quickly at any time (24/7 availability preferred)
• Strong communication skills and fast response times are a must
• Must provide at least 5 demo videos showing similar work or your capabilities
• Experience with automation platforms like Make.com, Zapier, and OpenAI APIs is a big plus
• I only work in Australian dollars (AUD) — please quote and invoice accordingly

This is not a full-time or ongoing role — just job-by-job, with the potential for more regular work based on performance.

To apply:
Send your portfolio, demo videos, tools you’ve worked with, and confirm your availability and AUD pricing.

We are looking for a skilled full stack developer to help us build a new version of our crypto trading app, evolving from the current v1. The ideal candidate will have experience in blockchain technology and web3 development, ensuring seamless integration and enhanced functionality. If you have a passion for cryptocurrency and a proven track record of developing robust applications, we want to hear from you! Responsibilities include designing, coding, and testing the new features of the app. Please apply with your portfolio showcasing relevant projects.

We are digitally signing a HTTP request and sending it across. We are using node.js.

The other end is using Java and getting the error - Digital signature validation failed: unknown object in getInstance: org.bouncycastle.asn1.DERApplicationSpecific

We need someone who can help resolving it.

We’re building a modern platform that connects with major communication and productivity tools. We’re looking for a backend engineer who can ship features fast and improve core integrations.

💼 Responsibilities
• Improve user onboarding (progressive tips, additional setup pages).
• Fix and enhance existing Slack API workflows.
• Develop and implement a robust Gmail integration (OAuth2, API endpoints).
• Build clean, secure, and scalable REST APIs for core features.
• Collaborate with frontend developers and product managers to deliver intuitive user experiences.

✅ Requirements
• Strong experience in Java 17, Spring Boot 3, and PostgreSQL.
• Proficient in OAuth2, JWT authentication, and API integrations (e.g., Gmail, Slack).
• Hands-on experience with multi-tenant systems.
• Ability to work independently and proactively suggest improvements.

✨ Nice to Have
• Familiarity with AI API integrations (OpenAI, Google AI).
• Previous experience with productivity/collaboration tools.

This is a hands-on role for someone who loves to execute and deliver quickly. You’ll work directly with the founder in a lean, fast-moving team.

We are developing an innovative timing and data management platform for athletics events, specifically targeting Little Athletics clubs in Australia. Our system leverages Bluetooth technology to capture athlete timings at various events (sprints, hurdles, jumps, throws), upload results to a database, and display these results on a user-friendly web platform.

What We Need:
A talented Full Stack Developer to help us design, develop, and maintain our athletics timing solution. This includes:

Developing and optimising the backend to manage real-time data uploads from Bluetooth timing gates and athlete tags.

Creating a responsive, intuitive frontend to display event results, athlete profiles, and competition management features.

Ensuring seamless integration between hardware (Bluetooth devices) and software (database and frontend).

Assisting with database design and optimisation for scalability and reliability.


Skills Required:

Proficiency in modern backend development (e.g., Node.js, Python, Java, or similar).

Experience with frontend frameworks (React, Angular, or Vue).

Database experience (SQL or NoSQL databases).

Familiarity with Bluetooth and IoT integration is highly desirable.

Experience with cloud services (AWS, Azure, or Google Cloud).

Knowledge of best practices for web security and performance optimisation.

Excellent problem-solving and communication skills.


Nice to Have:

Previous experience developing sports-related or timing applications.

Understanding of athletics/sports competitions and their scoring systems.


Deliverables:

Scalable, maintainable codebase for backend and frontend applications.

Documentation.

Ongoing support and updates as needed.

This document below outlines a comprehensive proposal for the development of a Software as a Service (SaaS) platform specifically designed for collegiate baseball programs. The platform aims to revolutionize how collegiate baseball teams manage scouting reports, track player development, organize team rosters, and leverage critical statistical data. This proposal details our understanding of your project requirements, identifies key functionalities based on the provided mockups and annotations, and presents a phased development approach. Providing essential features to immediately enhance your team's operational capabilities.

• Describe your recent experience with similar projects
• Describe your approach to testing and improving QA
• Include a link to your GitHub profile and/or website
• What frameworks have you worked with?

Hello, my name is Ali !

I am looking for a freelancer to help with my finished application. You must have experience in this field and an account (console).

The project is designed for long-term cooperation up to 3 months minimum. Stable and competitive payment is provided for work on the project;

If you are interested in long-term cooperation, write to me and we will discuss everything!