Junfeng Yu Email & Phone Number

Chengdu, Sichuan, China

0-1-5-10 Quality: Actively detected seven abnormal scenarios, diagnosing 23 root causes with a total of 1.75 million discoveries, reducing to 15,000 through the diagnostic system, achieving a 99.1\% convergence rate. It proactively identifies root causes before clients, enhancing user trust and uncovering potential internal framework issues to ensure project quality.OpsCenter: Significantly reduced the time for on-duty personnel in operational data and maintenance tasks. It visualized regional issue events and their diagnostic routing details through a quality dashboard and instance management, unifying access to various middleware platforms, and streamlined problem investigation and facilitated daily deep data synchronization.PDF Parser: Enabled PDF file parsing, covering most scenarios such as image-text parsing, small title recognition, cross-page table merging, cross-page paragraph merging, and multi-column parsing. Performance had improved to nearly 1.5x faster, with an average parsing time of under 200 ms per page in serial mode, significantly enhancing data cleaning and user recall effectiveness.Data Pipeline: Designed for heterogeneous data sources, allowing seamless expansion of various databases and storage types. It includes a project startup framework (service startup, HealthCheck, pre-start) and common components (task state machines, logging) to enable team members to focus on business development.

Xi'An, Shaanxi, China

Kernel Clipping: Responsible for the cutting of the database kernel, pre-research the database kernel in small memory scenarios, and conserve the memory usage to 10% of the original (from 1.6 GB cropped to 200 MB).Research: The only intern in the group who made project presentations to four project leaders at the same time and shared the research results of CCEH thesis.

Engine Design: Design a dynamic test engine for SQL parsing, load more than 110,000 SQL test samples from MySQL and PostgreSQL, and complete the parameterized test of the SQL parser within 1 minute.Optimization: Migrating test coverage reports from Travis to GitHub Action saved CI time by at least 3-5 minutes.

Remote

Design SDK: Design a pure Golang version (without CGO) high-performance io_uring I/O poller SDK, adopting the shared memory scheme, and implementing asynchronous I/O by designing Submit, Complete queues and memory barriers.Performance: Approximately 3 times improvement compared to epoll, implemented default POLL for poller using io_uring.

Changsha, Hunan, China

Participated in building the feature extraction & related testing of vehicle re-identification defence system based on Transformer, and independently designed the island of GLOM by Python.Reported 2 papers at the group per 2 weeks, and self-researched on the interpretability of neural network.

Bachelor'S Degree, Information Security

Co-organized Linux Open-Source Salon and Offline Launch with Ubuntu Kylin on behalf of school, Acted in the official promotional video.

High School Diploma