Kun Lei

Senior Frontend & Platform Engineer

Shanghai / Shenzhen / Suzhou · Currently employed; start date negotiable

Microsoft React/TypeScript engineer building reusable product UX, enterprise admin platforms and AI editors, with SSR, performance and measurable quality improvements.

Work Experience

Microsoft

2021.02 – Present

Software Engineer 2 (since 2022.09) · M365 Copilot Data Connectors (2026); MSN Finance & Community (2021–2025).

eBay China Center of Excellence

2020.05 – 2021.01

Software Engineer · React/TypeScript, Java/Spring marketing analytics; Jenkins, Docker and API tests.

Shanghai Zongyi Automation

2018.11 – 2020.04

Development Team Leader · Led five engineers on computer vision and Python/Flask model services.

Selected Engineering Impact

M365 Copilot Admin Platform Migration

2026

Migrated Confluence Cloud and On-Prem connector experiences; built reusable connector tabs and page containers, aligned styling with production and enabled macOS development.
Delivered help-panel rendering and localized strings for 100+ connectors; independently fixed and verified 10+ UX bugs and proposed a shared authentication-label improvement.

Frontend Performance, Testing & Observability

2022–2023

Reduced the Sports Card bundle from 227KB to 149KB (34%); maintained the Money Card below 150KB and implemented Sports App routing and pure SSR for SEO.
Co-improved unit-test coverage from 30% to 86%; supplied visual-parity solutions supporting coverage above 90%. Built dashboards reducing data latency from two days to five minutes.

AI Writing & Financial Conversation UX

2023–2024

Integrated iframe/inline/sidebar AI editors with theme, locale, sizing and postMessage support; delivered personalized-topic suggestions, guided inputs, monitoring and visual tests.
Owned a financial chat frontend prototype with seven widget types and writing-suggestion UX. The chat prototype reached flight readiness; it was not shipped after its framework was retired.

Consumer Product Delivery & Growth

2023–2025

Delivered community entry and post-list UX in a team initiative reaching 100K consumption DAU (14× baseline) and 11K action DAU (16×); shipped AIGC polls with comments doubling.
Shipped live earnings-call audio/video and stock/index/currency summaries across React UX, service integration and prompts.

leikunx-website · Multi-Site Frontend Platform

Personal project

Maintain a nine-service React monorepo with route discovery, prerendering and shared quality checks.
Build reusable route metadata, canonical URLs and sitemaps; verify mobile overflow and print parity for six bilingual one-page resumes.

Education

Xiamen University · BEng, Software Engineering

2013.09 – 2018.07

Skills & Public Work

TypeScript, React, Redux, HTML/CSS; component design, responsive UX, SSR/SEO, lazy loading and bundle optimization.

Unit/visual testing, monitoring and A/B analysis; Java/Spring, Python/Flask, Jenkins, Docker and AI-assisted development.

GitHub: https://github.com/leikunx

Portfolio: https://www.leikunx.com/