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Jiayin L.

@sekai1116

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5.0
3

3.8

3.8

67%

⭐⭐⭐ Web & Mobile & AI & Data Engineer ⭐⭐⭐

$30 USD / Hour

Flag of

Japan (12:52 PM)

Joined on June 20, 2025

$30 USD / Hour

Full-Stack & Mobile App & CRM & Artificial Intelligence Expert with over 8 years of experience designing and developing high-performance applications for web and mobile platforms. I specialize in creating AI-powered features, agentic AI workflows, machine learning solutions, natural language processing (NLP), cloud-native architectures, and scalable digital platforms that help businesses grow and adapt quickly. My technical expertise spans modern frontend frameworks (React, Angular, Vue, Next.js), backend development (Node.js, Python/Django, Java/Spring Boot, .NET Core), and mobile platforms (React Native, Flutter, Swift, Kotlin). I am also skilled in cloud computing (AWS, Azure, GCP), containerization and DevOps (Docker, Kubernetes, CI/CD), and databases (PostgreSQL, MySQL, MongoDB, Firebase, Redis). In the AI domain, I have built intelligent agents, RAG pipelines, and AI-driven SaaS solutions, leveraging frameworks like LangChain and integrating LLMs (OpenAI, HuggingFace, Anthropic) for tasks such as automation, decision-making, and conversational AI. My ML expertise includes computer vision, predictive analytics, and NLP applications such as chatbots, sentiment analysis, and text classification. I have successfully delivered projects across FinTech, Healthcare, E-Commerce, Travel, and EdTech, integrating complex workflows, APIs, and real-time features to provide seamless user experiences. My clients value me for writing clean, maintainable code, solving tough technical challenges, and delivering projects on time. Passionate about turning complex ideas into intuitive, impactful products, I bring a problem-solving mindset, strong communication skills, and a commitment to building solutions that deliver measurable business results.

Verifications

On time

100%

On budget

100%

Accept rate

100%

Portfolio

Portfolio

13685697
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13685697
13683342
13683351
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5.0 · 3 Reviews
Reviews
A

Ai Saas chatbot $10 USD

He told me he will finish in 3 days and after days, he couldn't complete, not responsible developer.

Md Yahiya A.

@afliae

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Dubai, United Arab Emirates

4 days ago

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J

Weebly-to-WordPress Site Modernization $300 USD

Nice work - clean looking site.

John G.

@johng003

Flag of

Chicago, United States

16 days ago

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Stable Diffusion / ComfyUI Local Setup (Video + Cloud‑Ready) $520 USD

Excellent freelancer, will engage again.

Charles I.

@QUALINK

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San Jose, United States

1 month ago

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Experience

Fullstack engineer & Principal Staff Engineer

Mar, 2022 - Apr, 2025

3 years, 1 month

Gree

Mar, 2022 - Apr, 2025

3 years, 1 month

-Built and shipped cross-platform mobile apps (React Native & Flutter) and responsive web apps (React/Next.js), delivering smooth UX, offline support, and fast load times. -Designed and operated REST/GraphQL backends (Node.js/NestJS + Python/FastAPI), containerized with Docker and deployed on AWS (ECS/EKS/Lambda) with GitHub Actions–based CI/CD.

Mar, 2022 - Apr, 2025

3 years, 1 month

Education

Beijing Institute of Technology

2011 - 2016

5 years

B.S. in Applied Mathematics & Computer Science

Flag of

China

2011 - 2016

5 years

Certifications

P

Preferred Freelancer Program SLA

AI Training - Freelancer Global Fleet

AI Training - Freelancer Global Fleet

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