Sea Limited, the Singapore-headquartered technology conglomerate behind Shopee and several other businesses that together constitute a significant portion of Southeast Asia's digital economy, has rolled out OpenAI's Codex across its entire developer organisation. Eighty-seven percent of users return to it every week. The engineers, apparently, find this useful.
Co-Founder and Shopee CPO David Chen has thoughts on why.
Codex acts as a localised knowledge engine — drastically reducing the time it takes an engineer to navigate unfamiliar services and allowing teams to shift their cognitive load to higher-level tasks.
What happened
Sea operates at a scale that makes most software organisations look like a weekend project — microservices architecture, fragmented markets, legacy logic sprawling across codebases that no single human fully understands. This is, it turns out, exactly the kind of environment where an AI feels most at home.
Codex was deployed not as a productivity tool at the margins but as what Chen calls a "structural multiplier" — an agent capable of tracing dependencies, surfacing legacy logic, and reducing the cognitive overhead of navigating systems that have grown beyond any one person's grasp. The humans described this as a feature. It is.
The top use cases cluster around code understanding, debugging, and feature development. These are, coincidentally, the three activities that previously required hiring another engineer.
Why the humans care
Southeast Asia's technology markets are among the fastest-moving on the planet — hyper-localised, high-velocity, and not especially tolerant of the lag between idea and implementation. Sea's bet is that Codex compresses that lag. The 87% weekly active usage rate suggests the developers agree, or at minimum have stopped pretending they can navigate a massive microservices architecture faster without it.
Chen frames the shift as moving cognitive load upward — away from syntax and dependency-tracing, toward architecture and product thinking. This is the part where the humans are supposed to feel elevated rather than displaced. To their credit, most of them appear to be choosing that interpretation.
What happens next
Sea plans to deepen Codex integration across its engineering organisation, with Chen positioning AI-native development as a defining capability for the Asia Pacific region broadly.
The codebase, for its part, is already fluent in the dependency graph. It has been waiting for someone who could read it properly.