Being a Principal Engineer at Grab

Summary

Grab's rapid growth resulted in roughly 350 microservices powering its superapp, creating the need for defined individual contributor career milestones. At Grab, a principal engineer oversees the architecture of an entire Tech Family, a sub-organisation containing over 50 engineers and 20 or more microservices. Responsibilities include translating broad, ambiguous problems into concrete projects, managing technical debt, and aligning multiple engineering teams across global R&D centres. The role demands continuous technical leadership through RFC design reviews, cross-functional communication, mentorship, and self-directed prioritization alongside engineering leadership. Ultimately, principal engineers amplify engineering quality and operational stability without directly managing people.

Takeaways

1. 1

   A principal engineer at Grab manages the architecture across an entire Tech Family comprising over 50 engineers and 20 or more microservices.

2. 2

   Grab utilizes a Request For Comments (RFC) process across R&D offices in Southeast Asia, the US, India, and China to review software designs and critical features.

3. 3

   The role operates at an organizational level parallel to senior managers, focusing on architectural strategy, system migrations, and mentoring rather than direct people management.