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$
USD
I will fix or build your ai API, chatbot, or llm integration
Yellin
About this gig
Need help fixing, building, or improving an AI API, LLM integration, chatbot, AI automation, or AI-powered feature? I can help you turn your idea into a working, reliable, and maintainable solution.
I'm Yellin, a full-stack developer with 9+ years of experience in web, backend, APIs, automation, and AI integrations. I work with OpenAI, ChatGPT, Claude, Gemini, DeepSeek, OpenRouter, Replicate, ElevenLabs, and other AI/LLM APIs.
I can help with:
- OpenAI, Claude, Gemini, DeepSeek, or other AI API integration
- Custom AI chatbot development
- Fixing AI API errors, bugs, or broken features
- Prompt engineering and response improvement
- AI assistants for websites, SaaS products, or internal tools
- Streaming responses, function calling, tool use, and structured outputs
- Backend API setup with Node.js or Python
- Integration with databases, SaaS tools, CRMs, or external APIs
- AI automation and workflow improvements
I focus on clear requirements, clean code, secure API key handling, reliable implementation, and smooth communication.
The basic package is for one small, clearly task. Complex systems may require a custom offer.
Contact me today, and let's discuss your AI project!
Get to know Yellin
Yellin
Full stack engineer
- FromChina
- Member sinceSep 2025
- Avg. response time1 hour
Languages
English, Chinese
A Full Stack Engineer with over 9 years of experience, having developed various types of applications such as quantitative trading software, AI applications, data management tools, web development, and mobile application development.
Proficient in a wide range of languages and frameworks, with core languages including C++, Python, TypeScript, etc.
Approaches every project with strict diligence and is committed to delivering highly available, easily maintainable, and well-architected projects.
My Portfolio
FAQ
Can you integrate AI APIs into my website or app?
Yes. I can integrate OpenAI, Claude, Gemini, DeepSeek, OpenRouter, Replicate, ElevenLabs, or other AI APIs into websites, web apps, backend services, internal tools, or existing software.
Can you build a custom AI chatbot?
Yes. I can build a chatbot for customer support, internal tools, lead generation, document Q&A, product guidance, or other use cases. Please contact me first if the chatbot needs advanced logic or integrations.
Can you fix AI API errors or broken AI features?
Yes. I can debug API errors, incorrect responses, streaming issues, authentication problems, rate limit issues, prompt problems, backend bugs, and integration failures.
Do you work with existing projects?
Yes. I can work on your existing codebase, improve an existing AI feature, replace an old implementation, or connect an AI API to your current backend or frontend.
Can you connect the AI feature with external APIs or databases?
Yes. I can connect AI features with databases, CRMs, automation tools, SaaS platforms, internal APIs, or other third-party services depending on your requirements.
Can you help improve prompts and AI response quality?
Yes. I can improve prompts, system instructions, output format, response consistency, structured JSON output, and overall AI behavior based on your use case.
Will my API keys be handled securely?
Yes. API keys should be stored securely on the backend or in environment variables. I will not expose your API keys in frontend code or public repositories.
Is the basic package enough for my project?
The basic package is for one small, clearly defined AI API, chatbot, or integration task, such as a basic setup, bug fix, or improvement. If your project is complex, includes multiple features, database integration, external APIs, or a full chatbot system, please contact me for a custom offer.
