You will get a Custom Chrome Extension for Web Productivity and Data
Top Rated
Project details
What sets this project apart:
Data Productivity: Expertise in structured data capture, web content annotation, and intelligent information management (based on my experience with specialized tools like PageMark).
Seamless Integration: I connect your browser tool to external databases (MongoDB/PostgreSQL) and custom APIs for real-time data synchronization.
Modern Architecture: Built with the latest Manifest V3 standards, ensuring your extension is future-proof, fast, and privacy-compliant.
Custom UI/UX: I design intuitive sidebars, context menus, and dashboard overlays that feel like a native part of the browser.
System Logic: Beyond simple scripts, I build complex extensions that handle authentication, cloud storage, and sophisticated business rules.
Whether you are building a proprietary tool for your team or a consumer-facing product, I provide the technical expertise to turn the browser into a high-powered workstation.
Data Productivity: Expertise in structured data capture, web content annotation, and intelligent information management (based on my experience with specialized tools like PageMark).
Seamless Integration: I connect your browser tool to external databases (MongoDB/PostgreSQL) and custom APIs for real-time data synchronization.
Modern Architecture: Built with the latest Manifest V3 standards, ensuring your extension is future-proof, fast, and privacy-compliant.
Custom UI/UX: I design intuitive sidebars, context menus, and dashboard overlays that feel like a native part of the browser.
System Logic: Beyond simple scripts, I build complex extensions that handle authentication, cloud storage, and sophisticated business rules.
Whether you are building a proprietary tool for your team or a consumer-facing product, I provide the technical expertise to turn the browser into a high-powered workstation.
Programming Languages
JavaScript, PythonWhat's included
| Service Tiers |
Starter
$99
|
Standard
$299
|
Advanced
$599
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
Number of Revisions | 3 | 5 | Unlimited |
Number of Pages | 3 | 5 | 10 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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KT
Kristian T.
Apr 28, 2026
Fix unstable map & marker clustering issue (Google Maps / WordPress)
I had a great experience working with this freelancer. He was fast, efficient, and very easy to work with throughout the entire process. Communication was clear and smooth from start to finish, and he understood the task perfectly without the need for repeated explanations.
He delivered exactly what was needed and handled everything in a professional and reliable way. I would definitely recommend him to others and would not hesitate to work with him again.
He delivered exactly what was needed and handled everything in a professional and reliable way. I would definitely recommend him to others and would not hesitate to work with him again.
About Yanjun
Senior Full-Stack AI & SaaS Engineer | MVP Development | React&Python
100%
Job Success
Guangzhou, China - 4:31 pm local time
"My objective is simple: Deliver clean, intelligent code that drives measurable business growth, not just complete a checklist."
I am a Full-Stack Software Engineer specializing in backend architecture, AI/LLM integrations, high-performance APIs, and robust workflow automation. I help founders, scale-ups, and corporate teams transform technical concepts into high-converting digital products that run flawlessly under pressure.
💎 CORE SERVICES I DELIVER:
● AI & LLM Integration: Implementing intelligent features using OpenAI API, Claude (Anthropic), LangChain, and vector databases for custom chatbots, data extraction, and autonomous AI agents.
● SaaS & Web Application Development: Building scalable, secure web products from scratch using Python (FastAPI, Django), PHP (Laravel), and modern frontend frameworks like Vue.js.
● High-Performance API & System Integration: Connecting complex databases with third-party ecosystems (Stripe, HubSpot, Salesforce, custom CRMs) with strict adherence to data integrity.
● Intelligent Automation & Tooling: Developing custom Chrome Extensions for operational productivity, specialized internal scrapers, and automated workflows that save hundreds of engineering hours.
🛠️ TECHNICAL MATRIX:
● AI & Automation: OpenAI API, Claude API, LangChain, Prompt Engineering, Vector DBs
● Languages: Python, PHP, Golang, JavaScript, SQL
● Frameworks & Ecosystems: FastAPI, Django, Laravel, Vue.js, Node.js
● Cloud & Infrastructure: AWS, Vercel, Linux Server Administration, CI/CD pipelines
🔒 COMPLIANCE & PRIVACY ASSURANCE (For Enterprise Clients):
As a professional engineer, I prioritize data protection, especially regarding AI data privacy and API security. All environments utilize secure credential management, strict IP assignment compliance, and robust data hygiene protocols. Non-Disclosure Agreements (NDAs) are welcome prior to project scoping.
🤝 WHY PARTNER WITH ME:
● Business-First Mindset: I prioritize the Lean MVP approach—getting your AI or SaaS product to market fast without over-engineering.
● Elite Debugging & Diagnostics: I specialize in "legacy code rescue"—turning unstable, broken, or undocumented systems into clean, maintainable assets.
● Transparent Communication: I break down complex architectural blockers into plain English, providing honest, realistic timelines.
📩 Facing a technical bottleneck or ready to build your next AI-driven micro-SaaS? Drop me a message below. Let’s get your infrastructure moving forward.
Steps for completing your project
After purchasing the project, send requirements so Yanjun can start the project.
Delivery time starts when Yanjun receives requirements from you.
Yanjun works on your project following the steps below.
Revisions may occur after the delivery date.
Technical Architecture & Permissions
I will define the Manifest V3 structure and map out the necessary browser permissions to ensure the extension is secure, privacy-compliant, and future-proof.
UI/UX & Content Script Development
Building the user interface (Popup or Sidebar) and developing the content scripts that interact with the target web pages' DOM structure.