What Do Billions of Code Lines Reveal About Big Tech’s Development Scale?

Tencent added 12.9 billion lines of code in 2019, making it the largest codebase among Chinese internet giants, while Ant Financial’s Alipay reported 4 billion new lines the same year.

For perspective, the classic MMORPG World of Warcraft contains only about 5.25 million lines, so Alipay’s code equals roughly 80 copies of that game.

Alipay also highlighted that 63 % of its staff are engineers and that they have built intelligent systems for spam detection, blockchain‑based milk‑powder safety, real‑time risk control, and have won several “world champion” competitions.

Historical code‑size comparisons show Linux 3.1 (~15 million lines), Windows XP/7 (~40 million), Vista/VS 2012 (~50 million), Facebook (~60 million), and many others.

Computer‑science PhD 任晶磊 argues that in 2020 software evaluation should focus on contribution value rather than raw line counts.

He also examined Alibaba’s open‑source Dubbo project, noting that two commits alone accounted for 11.5 % and 6.0 % of the total code changes, mainly refactoring and renaming.

Other observations point out that a large portion of Alipay’s 4 billion lines may consist of duplicated or non‑functional code, such as repetitive formatting changes.

Overall, publicly disclosing code‑line metrics reflects a company’s confidence in its engineering capabilities and a shift from sales‑driven to technology‑driven product strategy.

Source: Zhihu and related media.