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Building GenAI & cloud-native products from zero to production

Yang Qin

Full-stack Engineer · GenAI SaaS / Cloud-native

Software Engineer at EmotionTech, Inc.
Resume (en) Resume (ja) LinkedIn GitHub

Highlights

GenAI SaaS

Led an AI-backed SaaS from scratch to production, including LLM gateway and processing pipelines.

Cloud-native Backend

Designed reliable backends on GCP/AWS with FastAPI, Rust, and serverless architectures.

Full-stack Delivery

Shipped end-to-end products across frontend, backend, and infrastructure.

Multilingual

Fluent in Chinese and Japanese, effective in English.

About

I'm a full-stack software engineer focused on building reliable GenAI and cloud-native products.

I specialize in TypeScript, Python, Rust, React, FastAPI, and cloud infrastructure, with hands-on experience taking products from scratch to production.

With a background in mechanical engineering and over a decade in Japan, I bring both system-level thinking and cross-cultural communication to engineering teams.

Tech Stack

TypeScript Rust Python Go React Next.js Angular Svelte Node.js Deno Fastapi Icon Streamline Icon: https://streamlinehq.com FastAPI PostgreSQL MongoDB Redis Docker AWS Google Cloud Azure OpenAI VertexAI

Experience

EmotionTech, Inc.

Backend Engineer(semi-fullstack)

01.2024 - present

  • ♦ Led the development of an AI-backed SaaS from scratch to production, owning the backend architecture, LLM gateway, and cloud processing pipelines.

  • ♦ Built on-demand text processing pipelines using Angular, FastAPI, PostgreSQL, Cloud Run, Workflows, and Cloud Jobs.

  • ♦ Designed a GenAI gateway to unify multiple LLM vendors behind a single API.

  • ♦ Ran the agile process, conducted code reviews, mentored junior developers, and promoted best practices.

  • ♦ Partnered with AI engineers to integrate OpenAI models (text completion + embeddings).

Angular FastAPI PostgreSQL Cloud Run Workflows Cloud Jobs Cloud Tasks Python Docker Azure OpenAI VertexAI

Freelance

Fullstack Developer

12.2021 - Present

  • ♦ Developed an order, inventory, and payment management system for an e-commerce company using Next.js, Axum (Rust), MongoDB, Redis, Lambda, and CloudFront.

  • ♦ Owned end-to-end delivery, from requirements gathering with the client to design and implementation.

  • ♦ Designed the UI/UX in Figma and implemented it with Tailwind CSS.

Next.js Axum MongoDB Redis Lambda CloudFront Figma Tailwind CSS

Azbil Corporation

Fullstack Developer

10.2022 - 10.2023

  • ♦ Developed a web application for manufacturing digital transformation using Angular, .NET Core, SQL Server, and CloudFront.

  • ♦ Optimized the serverless architecture on AWS.

  • ♦ Researched Generative AI and implemented a RAG-based chatbot for internal use.

Angular Dotnet Core SQL Server Azure OpenAI RAG

Azbil Corporation

Mechanical Engineer

03.2015 - 09.2022

  • ♦ Designed and developed mechanical parts for control valves.

  • ♦ Designed manufacturing processes for control valves in a China-based factory.

  • ♦ Designed and developed manufacturing equipment for the production line.

Creo CAD Casting Machining Assembly

Education

Mechanical Engineering | Yokohama National University

04.2012 - 03.2015

  • ♦ Built strong foundations in Numerical Analysis and Simulation.

  • ♦ Focused on Fluid Dynamics Analysis, researching Microchannel Analysis for Fuel Cells.

  • ♦ Strengthened problem-solving and teamwork skills.

Numerical Analysis Simulation Fluid Dynamics Analysis Microchannel Analysis Problem Solving Self-learning Presentation