# Fabian Terh

> Software Engineer at WhatsApp (Meta)

Location: San Francisco Bay Area, United States
Profile: https://flows.cv/fabian

I'm passionate about creating impact at scale to make a difference ❤️. Open-source contributor; writer on Medium. Excited about solving tough problems, and always seeking to learn something new.

Currently on WhatsApp chat infra team, previously on a Facebook product team.
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I'm a self-driven, motivated, and independent learner who discovered my passion for programming and software engineering midway through law school (read more here: https://medium.com/@fabianterh/celebrating-1-year-as-a-software-engineer-e21148e307c0).

In my free time, I build and maintain side projects to learn new skills and technologies and make life sweeter. 

Blog: https://medium.com/@fabianterh
Twitter: https://twitter.com/@fabianterh
Github: https://github.com/fterh
Website: https://fabianterh.me

## Work Experience
### Senior Software Engineer @ Meta
Jan 2023 – Present | Menlo Park, California, United States
Still on the WhatsApp chat infra team.

### Software Engineer @ Meta
Jan 2021 – Jan 2023 | Menlo Park, California, United States
I'm on the WhatsApp Messaging (Chat) Infra team, which develops and operates the core messaging routing infrastructure serving 2.4B users sending >100B messages daily.

- Optimized a hotpath (messaging) service for performance, durability, and consistency, reducing write latencies by 20%. Investigated and root-caused data inconsistencies, fixed race conditions.
- Built infra components to enable privacy features rollout
- Improved WhatsApp’s E2E testing infra used by all server engineers

### Software Engineer @ Facebook
Jan 2020 – Jan 2021 | San Francisco Bay Area
- Rolled out Groups Admin Tagging from 70M to 411M groups globally as part of a cross-functional effort
- Drove the effort to achieve 100% E2E, as well as unit and integration, testing

### Software Engineering Intern (iOS) @ Sea
Jan 2019 – Jan 2019 | Singapore
I worked on Booyah, a mobile game live-streaming application.
• Improved app responsiveness in poor network conditions. Optimized multiple image downloads in a collection view by implementing a priority queue to prioritize visible views.
• Designed an infinite scroll view and optimized it for performance and user experience.
• Profiled the performance of data-persistence utility components used across multiple teams and applications to uncover bottlenecks. Presented my findings at an internal knowledge-sharing session with company-wide iOS engineers.

### Undergraduate Teaching Assistant: CS1010E Programming Methodology @ National University of Singapore
Jan 2019 – Jan 2019

### Product Engineering Intern (Full Stack) @ ReferralCandy
Jan 2019 – Jan 2019 | Singapore
I worked on CandyBar, a digital punch card loyalty program.
• Collaborated with product managers and designers to build, QA, and release product features in weekly sprints.
• Fixed bugs, wrote tests, and improved documentation to enhance the quality of the codebase.
• Worked closely with Marketing to build new React components to improve SEO and create website content.
• Attended merchant interviews to understand the needs, priorities, and concerns of users.

### Undergraduate Teaching Assistant: CS1010S Programming Methodology @ National University of Singapore
Jan 2019 – Jan 2019

### Volunteer Teaching Assistant @ Saturday Kids
Jan 2019 – Jan 2019
Taught Python to students under a Google-sponsored initiative for free coding classes.

### Full Stack Engineering Intern @ Trampolene
Jan 2018 – Jan 2018 | Singapore
• Conceptualized, designed, and built a single-page web application MVP from scratch using React and Redux.
• Initiated the research and incorporation of new technologies (Flow, Jest, Enzyme) into the project to improve code quality.
• Wrote many functional tests to ensure the robustness of the application.


## Education
### Bachelor’s Degree in Computer Science & Law
National University of Singapore
Jan 2015 – Jan 2019

### GCE A-Level
Raffles Institution
Jan 2011 – Jan 2012


## Contact & Social
- LinkedIn: https://linkedin.com/in/fabianterh
- Website: https://fabianterh.me
- Website: https://medium.com/@fabianterh
- GitHub: https://github.com/fterh

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Source: https://flows.cv/fabian
JSON Resume: https://flows.cv/fabian/resume.json
Last updated: 2026-03-22