Iron Foundry by Terra API – Details, episodes & analysis

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Iron Foundry by Terra API

Kyriakos Eleftheriou

Business

Frequency: 1 episode/23d. Total Eps: 68

Kyriakos Eleftheriou, the founder and CEO of Terra API speaks with some of the best founders and CEOs in the space of health and fitness, to learn how the best are building their businesses. At TERRA API, we are on a mission to enable developers to connect and create solutions by using health data.

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http://tryterra.co
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https://tryterra.co/podcast
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https://blog.tryterra.co/podcast/home
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https://twitter.com/terraapi
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https://twitter.com/kyriakosel
15 shares
http://twitter.com/kyriakosel
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https://www.linkedin.com/company/terraapi
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https://www.linkedin.com/company/terraapi/
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https://www.linkedin.com/in/dougsweeny/
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Score global : 38%

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Former Y Combinator President | Geoff Ralston

Monday, June 1, 2026 • Duration 01:06:25

⁠Geoff Ralston⁠⁠ built Rocket Mail before Yahoo Mail existed, built Lala before Spotify worked in America, sat in Steve Jobs' living room to get an acquisition approved, and ran Y Combinator as President. Now he says the most important thing he's ever worked on is making sure AI doesn't kill us.

In this episode with ⁠⁠Kyriakos Eleftheriou⁠⁠, Geoff speaks about YC, SAIF, the Yahoo acquisition, and the top learnings after decades in silicon valley

00:00 Introduction

03:45 The $70K bet that built Sand Hill Road

06:07 Early to every wave

06:59 "The most important thing I've ever worked on"

08:18 Timing is luck. Here's how to get lucky anyway

10:46 Quitting HP the day he saw the Mosaic browser

15:39 Paul Graham's "packets of cash" acquisition rule

19:35 The Yahoo revolt that almost killed the deal

33:45 Zuck killed Facebook Music in one sentence

39:05 Why Steve Jobs offered him a job — and why he said no

45:40 Running Y Combinator

50:37 Steve Jobs' real superpower

54:06 Why AI is more dangerous than people think

01:01:15 Peter Thiel is wrong about competition

01:03:31 Marc Andreessen is wrong about introspection

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Head of Samsung Next: David Lee - Live in LA

Friday, May 1, 2026 • Duration 42:49

By the age of 25, David Lee survived stage 4 lymphoma. Not only did he not let it stop him, he worked early in Google, became a partner at SV Angel during the Airbnb / Twitter / Dropbox / Snapchat era, and now leads Samsung Next. In the latest discussion with Kyriakos Eleftheriou in Los Angeles, they discussed:

CHAPTERS

(00:00) Introduction

(02:30) Why digital health still hasn't had its "reusable rocket"

(07:00) "Law school is coding for your mind"

(08:30) How Elon, Dorsey and Belichick boil any problem down to 3 things

(11:00) Telling Yo-Yo Ma from a college cellist — how to spot real talent

(14:00) The NFL gets the #1 pick wrong 50% of the time — so how do you pick founders?

(16:30) Most pro athletes are scared in big games

(19:30) Without a killer product, you have no strategy

(22:00) Vanity beats health — why no one wears the clunky device

(29:00) Your kids will never do what you tell them — they copy what you do

(32:30) Jensen Huang, Saturdays, and why the top person sets everything

(37:30) The "red zone of intelligence" AI will never touch

(38:30) Why the great fitness instructor gets paid more in the AI era

(40:30) Why VC is the wrong financing model for the next decade

(41:30) Mike Ovitz and CAA — the playbook for winning in AI

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Chief Growth Officer of HYROX: Douglas Gremmen

Wednesday, April 8, 2026 • Duration 01:04:17

42,000 tickets for one New York event. 15,000 gym affiliates. $0 spent on influencers. HYROX CGO Douglas Gremmen joins Kyriakos, CEO of Terra API , at the Connected Health Summit in Stanford to talk through what actually drove that — and what didn't work.

The US was their first market outside Germany and their hardest. Three years of losses. A single Lance Armstrong weekend changed the momentum — not because they paid him, but because he just turned up. The gym affiliate program started as inbounds with no structure; it's now the foundation of a bet to reach 100 million people. The CrossFit comparison gets a real answer, not a PR one.

But the most interesting parts are the early decisions: rejecting the $2 race t-shirt, the photo package that created the organic flywheel, and a simple principle — invest in the event experience and don't run paid marketing.

00:00 Welcome to Stanford

01:46 Running HYROX at a Conference & the "Bubble" Moment

03:48 The Sweaty Barrier to Participation Problem

05:44 Douglas's Backstory: Sports Marketing & How HYROX Was Born

08:59 From First Event in Hamburg to Leading Global Expansion

10:29 Early Growth: The Van, T-Shirts, Red Bull & the Photo Flywheel

12:36 Global Expansion: Japan, Brazil, India & Getting on the Calendar

14:56 Why the US Was the Hardest Market to Crack

17:28 Losing Money in America — Keeping Belief When the P&L Doesn't Work

19:09 The Lance Armstrong New York Bet: $1M & 30M Impressions

20:27 Influencers at HYROX: Always Organic, Never Paid

CTO + Director of AI at Flo Health: Roman Bugaev + Vladislav Nedosekin

Monday, March 2, 2026 • Duration 01:41:31

In the latest episode, Kyriakos Eleftheriou sat down with Roman Bugaev , CTO of Flo and Vlad Nedosekin Director of AI Platform, at the Terra API HQ in London, to discuss how they built the top health AI platform globally for women's health.

CHAPTERS

(0:00) Intro — Flo Health: From 20 People to 80 Million Users

(1:02) How Flo became the fastest-growing health company in the world

(1:48) Roman's early days: 20 employees, no revenue, product-market fit

(3:15) How did you know the product was a hit?

(3:25) The underserved women's health market — everyone was building Uber alternatives

(4:31) First ML: neural networks for cycle and symptom prediction

(5:31) Product evolution — from symptom tracking to AI-powered insights

(5:38) Building chatbots inspired by how doctors ask questions

(9:18) A/B testing at scale — Flo's custom experimentation platform

(11:43) Engineering structure: autonomous two-pizza teams

(13:51) Team mistakes — why separate mobile and backend teams failed

(15:29) Scaling from 4 servers to 600 services and petabytes of data

(17:53) "Whenever it's possible, we are NOT doing AI"

(23:15) Why temperature data is critical for ovulation prediction

(25:09) Why Flo is the most accurate period tracker — data diversity advantage

(28:04) Competition: "We don't really have real competitors"

Glovo and Yellow.vc co-founder, Sacha Michaud

Sunday, January 18, 2026 • Duration 01:25:25

In this episode, Kyriakos Eleftheriou, Terra API CEO sits down with Sacha Michaud, co-founder of Glovo, one of the biggest tech successes in the European tech ecosystem,and Yellow.VC, an early-stage fund

Sacha shares the journey of building the on-demand delivery service from its inception in Barcelona to its expansion across 25 countries and a $2.3 billion acquisition.

He discusses the initial challenges of fundraising, competing against larger companies, and the importance of passion and culture in building a successful team. Michaud reflects on the early days of Glovo, where they experimented with a simple app that allowed users to order anything from the city, leading to unexpected viral growth despite initial losses. He emphasizes the significance of adapting to market needs and the evolution of Glovo's business model over the years, particularly during the COVID-19 pandemic, which accelerated the demand for grocery delivery.

Chapters

00:00 Introduction

02:29 The Birth of Glovo: From Idea to Launch

05:59 Viral Growth and Initial Operations

12:06 Realizing the Potential of Glovo

21:39 Expanding into New Markets

38:55 Navigating Competition and Strategic Decisions

50:39 The $2.3B Acquisition

55:00 Yellow, and investing in new startups

01:04:11 AI and Future Trends in Delivery

Thriva CTO: Tom Livesey

Tuesday, October 21, 2025 • Duration 55:08

In this conversation, Kyriakos Eleftheriou is joined by Tom Livesey, CTO and co-founder of Thriva, who discusses the journey of his health tech company, which has transformed the way individuals monitor their health through innovative blood testing solutions.

He shares insights on the challenges faced during the startup phase, the impact of COVID-19 on their operations, and the importance of consumer awareness in health diagnostics. Tom emphasizes the need for personalization in health insights and the role of technology in improving user experience.

He also touches on the fundraising journey, navigating the NHS landscape, and the future of health tech.

Chapters

00:00 Intro

02:44 Navigating the Challenges of Health Testing

05:30 The Evolution of Thriva's Product Offering

08:33 Fundraising Journey: From Startup to Success

11:15 COVID-19: A Catalyst for Change

14:11 The Future of Health Diagnostics

16:53 Building a Sustainable Business Model

19:29 Customer Acquisition and Marketing Strategies

22:27 The Role of Technology in Health Monitoring

24:56 The Impact of Consumer Awareness on Health

27:32 The Next Decade: Predictions for Health Tech

30:35 Addressing Consumer Anxiety in Health Testing

33:15 The Importance of Personalization in Health Insights

Huma CEO: Dan Vahdat

Sunday, September 21, 2025 • Duration 01:37:06

The first Iranian entrepreneur to build a company worth over $1B in Europe, Dan Vahdat, founder of Huma, is joining Kyriakos Eleftheriou, founder of Terra API

They discuss:

00:00 - Intro

02:10 - Communicating with @EmmanuelMacron and @kmitsotakis

08:55 - Why are Greece and Persia not empires today

13:40 - How the best people look like

18:30 - Short-term vs long-term thinking

24:27 - Dropping out of PhD

26:57 - The first months of Huma

32:00 - Early days

32:27 - 'I never had the ego of being turned down'

34:00 - First customers

37:21 - How to price expensive contracts

48:30 - Regulation as a moat

59:10 - Raising $300m from partners instead of VC

1:02:58 - AI

1:06:00 - Storytelling advice

1:09:55 - Running

1:14:32 - Cyrus, Darius, and Achaemenid inspirations

1:19:23 - The future

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Virgin Active CTO: David Turner

Friday, September 5, 2025 • Duration 59:40

David Turner is the Group CTO of Virgin Active, a global health brand with more than 230 fitness clubs across 8 countries. He previously led NHS tech during Covid.

The host: Kyriakos

More about Virgin Active00:00 - Intro01:26 - UK Tech05:33 - F1 telemetry vs fitness data07:33 - Betting + health data09:30 - Getting into software engineering13:51 - Inside NHS tech: joining mid-Covid chaos14:00 - Leading the NHS Covid digital response, 24/720:56 - Building national-scale testing tech24:49 - The real data engine behind the Covid travel pass26:00 - Virgin Active after NHS30:40 - Inside Virgin clubs tech33:40 - 360° member view41:40 - Rewards45:19 - Why true gym innovation came from outsiders54:40 - Advice to young engineers: fail fast, fail often58:17 - The future of health: your constant digital twin

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Nucleus Genomics Founder: Kian Sadeghi - Live

Monday, August 4, 2025 • Duration 01:16:46

The founder of Nucleus, Kian Sadeghi, joined Kyriakos Eleftheriou, in the second health day in San Francisco, and shared his learnings in front of a 300-person audience before the Y Combinator AI event.

00:00 Intro

02:01 The Jake Paul vs. Mike Tyson fight sponsorship story.

05:01 "Fundraising is an art."

08:01 Competing with Mr. Beast and the importance of storytelling.

11:01 The evolution and impact of genetic testing.

14:01 Future of genetics and embryo selection.

17:01 AI in genetics.

20:01 Narrative in startup success.

23:01 Regulatory challenges

26:01 Personal journey and insights on building a company.

29:01 Genetic testing market

32:01 The role of computational biology in genetics.

35:01 The impact of whole genome sequencing on healthcare.

38:01 The future of genetic engineering and its societal implications.

41:01 The intersection of AI and genetics.

44:01 The importance of storytelling in the tech industry.

50:01 Future vision.

53:01 Q&A

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Strava cofounder: Mark Gainey Live in San Francisco

Tuesday, July 15, 2025 • Duration 01:12:55

After the Y Combinator AI event, Kyriakos Eleftheriou sat down with Mark Gainey co-founder of Strava, who shared his entrepreneurial journey, discussing the evolution of Strava from a startup to a $2.2 billion fitness platform.

Chapters

00:00 Intro

04:15 How technology changed

11:35 Should you be niche with AI

13:20 Building a Community

17:00 Dealing with big companies early on

20:53 User Feedback

23:00 Elimination process

25:10 Fundraising

28:43 AI

30:50 Adding more sports

36:18 The Future of Fitness

42:20 Storytelling

46:00 Q&A

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Iron Foundry by Terra API – Details, episodes & analysis

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Iron Foundry by Terra API – Details, episodes & analysis

Podcast details

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Latest published episodes

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