Sai Gurrapu
Founder & CEO at Hypercubic; ex‑Apple ML engineer
saigurrapu
San Francisco Bay Area, California
Joined September 2025
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Summary
Founder and early‑stage operator: Sai has repeatedly built and shipped product prototypes and startups since college — from HitchHiqe (campus ridesharing) to Wonderly (an AI search assistant) and most recently Hypercubic (YC Fall 2025), where he serves as CEO. His work shows a pattern of founding technical, product‑driven startups and taking them into early market/accelerator stages. ycombinator+2
Applied ML researcher with an emphasis on explainability and multimodal NLP: His graduate research (Virginia Tech / A3 Lab) focused on explainable claim verification, rationalization, and multimodal fact‑checking, resulting in publications and datasets. This academic work underpins his applied ML roles and signals strengths in explainability, NLP, and multimodal model engineering. vt+2
Product‑focused ML engineering at scale: Sai transitioned from academic research to product ML engineering at Apple, working on multimodal ML features for iPhone products before founding Hypercubic; this path suggests an ability to translate research into deployed product systems and to operate at the intersection of research, engineering, and product. saigurrapu+1
Hackathon and hands‑on builder culture: A long history of hackathon wins and public project repos (Devpost, GitHub, personal portfolio) indicates strong prototyping skills across full‑stack, mobile, and ML tooling — useful both for rapid product iteration and technical leadership. devpost+2
Work
Education
Projects
Writing
Rationalization for Explainable NLP: A Survey
January 1, 2023A survey on rationalization techniques for explainable NLP; synthesizes prior work on explainability and rationales for model predictions.
End-to-End Multimodal Fact-Checking and Explanation Generation (MOCHEG / dataset & models)
January 1, 2023Contributed to multimodal fact‑checking research and datasets (Mocheg), addressing evidence retrieval, claim verification, and explanation generation for multimodal evidence.
Exclaim: Explainable neural claim verification using rationalization
January 1, 2022Work on explainable claim verification using rationalization approaches (conference/paper and thesis work during graduate studies).
Hobbies
Photography (maintains a photography section on personal site) saigurrapu
Playing guitar saigurrapu
Hackathon/product‑building (regular hackathon participant and multi‑award winner) devpost+1
Notes
JHJeff Heitzmansaid they've seen
SGSai Gurrapu
achieve standout results as a founder at an early-stage, venture-backed startup.Feb 28, 2026
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