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Kyriakos Eleftheriou

Kyriakos Eleftheriou

Founder & CEO, Terra API — health data API

kyriakos
London, United Kingdom
Joined January 2025
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Network

9.2K connections
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Early-Stage Investors
⚕️
HealthTech Founders
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Product Engineering Leaders
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Health Fitness Executives
🤝
YC Investors Partners
💻
Terra API Core Team
🎓
Uni Alumni

Summary

Founder & CEO of Terra API, building a developer-first health data API focused on integrations, health scoring, and compliance. tryterra+2
Technical background in electrical engineering and energy systems informs product and systems thinking. ac
Builds high‑velocity teams and hiring processes, prioritizing values, chemistry, and rapid feedback. tryterra+1
Former special forces commando and competitive lifter — disciplined, performance‑driven leader. medium+1

Work

Education

Writing

How Can We Build For Good? — Interview/profile

April 1, 2025

Interview about Kyriakos' background and Terra's mission.

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Who we are, and how Terra works

June 1, 2022

Company blog post outlining Terra's product, engineering, and security approach.

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The journey to Y‑Combinator

March 1, 2021

Personal essay on founding Terra and the YC experience.

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Terra Podcast — Stay Fit, Stay Connected

Weekly interviews with founders, executives, and investors about fitness, health tech, and building companies.

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Founder of Remote: Marcelo Lebre

Kyriakos interviews Marcelo Lebre on building Remote and scaling a global HR platform; discussions include health, culture, and focus.

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Founder of Flo Health: Dmitry Gurski

January 1, 2024

Conversation with Dmitry Gurski about launching Flo, product strategy, and growth experiments.

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Lance Armstrong — Live in San Francisco

November 1, 2024

Live interview with Lance Armstrong on his athletic career, resilience, and investing.

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Hobbies

Weightlifting and fitness; holds advanced training diplomas. medium+2

Notes

USUtkarsh Sinhasaid that if they were to recommend the most prominent startup founders,
KEKyriakos Eleftheriou
would make their list.

Mar 24, 2026

USUtkarsh Sinhasaid
KEKyriakos Eleftheriou
is one of their go-to connections in the YC network for support or collaboration.

Feb 14, 2026

HSHarsh Sinhasaid
KEKyriakos Eleftheriou
is one of their go-to connections in the YC network for support or collaboration.

Jan 21, 2026

HSHarsh Sinhasaid
KEKyriakos Eleftheriou
has impressed them with how effectively they've transitioned from military to civilian work.

Jan 7, 2026

USUtkarsh Sinhasaid
KEKyriakos Eleftheriou
stands out in the YC community for building and scaling a venture-backed company.

Nov 26, 2025

MMMaximilian Matthewssaid
KEKyriakos Eleftheriou
is one of the most impressive YC founders they know who’s gone on to raise significant funding.

Nov 21, 2025