Welcome to Laputa — a digital island drifting between computation and contemplation.
I’m Jianyong Chen, a software engineer exploring CDN infrastructure, serverless platforms, and edge computing. Through my journey across cities and codebases, I find beauty not only in systems and syntax, but also in landscapes and light.
Here you’ll find:
- Blog posts on performance, distributed systems, and low-level optimization.
- Projects I’ve built or contributed to.
- Photographs from my travels — mountain trails, ancient streets, modern skylines.
This is a space for thought and memory, grounded in bits, yet reaching beyond.
Professional Experience
-
TikTok (London) — Jan 2025 – Present
Building MCDN, a multi-vendor CDN control plane with unified security, pre-warm scheduling, and real-time events analytics across multiple vendors, including Akamai, Fastly, and more. -
Tencent (Shenzhen) — Jul 2021 – Jan 2025
• Embedded Lua & V8 inside Tencent’s edge servers, migrating traditional CDN logic to a serverless model (> 1 B QPS).
• Delivered AOT byte-code cache, per-request CPU-time limiter, and a distributed tracing system for scripts running on the global edge. -
ByteDance (Beijing) — Nov 2019 – Jul 2021
• Secured ad delivery for Douyin/TikTok with a feedback filter that blocked 100+ illegal ads per day.
• Improved video-ad transcoding and playback quality via A/B-driven H.265 tuning. • Interned on TikTok Creator Marketplace; split ad logic into a dedicated service for easier maintenance.
I’m passionate about system programming, distributed systems, performance engineering, and low-level optimization. I’m most comfortable with C/C++, Go, Python, Lua, and JavaScript.
Open Source Contributions
I actively contribute to open-source projects, particularly in systems and infrastructure. Notable contributions include:
- OpenResty — fixed the implmentation of
ngx.re.*APIs - Seastar — optimized the WebSocket implementation
Engineering Philosophy
I value simplicity, composability, and understanding systems from the bottom up. Optimizing for correctness and clarity has always been my priority.