HERNÁN BARIJHOFF

MS CS | MLE | EA | Founder

Building Mental Health tech that scales

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What I Think

I've experienced first hand the transformative power of therapy, but I've known so many people who didn't have the same experience, or didn't even try it because of bias or stigma. This frustrated me, and I started to wonder, what was wrong? The therapists' abilities? The process itself? Access? Society?

While researching societal problems, I came across the EA movement, and in particular, the work of a philosopher, Michael Plant, who proposes that happiness should be the metric we should strive for, not 'years-lived' or 'lives-saved'. What's the point of a life saved but riddled with suffering?

At the same time, I've always wanted to build a startup, because I think it has the biggest impact of any endeavor you could pursue, if you can actually pull it off.

My gut feeling was that it was worth diving deep into Mental Health, specifically facilitating access to quality therapy. That's how my current project MindApp started. I've learned things you can only learn by doing: how to balance patient needs with business sustainability, how edge cases reveal gaps in your initial thinking, when automated systems should escalate to human judgment. Being a founder taught me many different things — about people, product, frustration, and purpose. Invaluable learnings. The most meaningful moments for me have been when a patient says 'thank you, you’ve helped me a lot .'

Technology for me was always a means to an end. I studied and worked in AI because I understood early on that it was one of the most powerful tools for creating real change in people's lives. Before MindApp, I spent years in the startup ecosystem, learning as much as I could, including time at an early-stage YC company (EmiLabsYC19) building NLP chatbots to improve job access for frontline workers.

That's also why I'm following AGI progress closely and participating in AI safety community events in Buenos Aires. The timeline for world-changing AI is shorter than most people assume, and Mental Health will be among the domains deeply reshaped—whether through AI-assisted therapy, companionship relationships, or risks we're only beginning to understand. I want to help ensure that transformation improves rather than undermines human wellbeing.

I've experienced first hand the transformative power of therapy, but I've known so many people who didn't have the same experience, or didn't even try it because of bias or stigma. This frustrated me, and I started to wonder, what was wrong? The therapists' abilities? The process itself? Access? Society?

While researching societal problems, I came across the EA movement, and in particular, the work of a philosopher, Michael Plant, who proposes that happiness should be the metric we should strive for, not 'years-lived' or 'lives-saved'. What's the point of a life saved but riddled with suffering?

At the same time, I've always wanted to build a startup, because I think it has the biggest impact of any endeavor you could pursue, if you can actually pull it off.

My gut feeling was that it was worth diving deep into Mental Health, specifically facilitating access to quality therapy. That's how my current project MindApp started. I've learned things you can only learn by doing: how to balance patient needs with business sustainability, how edge cases reveal gaps in your initial thinking, when automated systems should escalate to human judgment. Being a founder taught me many different things — about people, product, frustration, and purpose. Invaluable learnings. The most meaningful moments for me have been when a patient says 'thank you, you’ve helped me a lot .'

Technology for me was always a means to an end. I studied and worked in AI because I understood early on that it was one of the most powerful tools for creating real change in people's lives. Before MindApp, I spent years in the startup ecosystem, learning as much as I could, including time at an early-stage YC company (EmiLabsYC19) building NLP chatbots to improve job access for frontline workers.

That's also why I'm following AGI progress closely and participating in AI safety community events in Buenos Aires. The timeline for world-changing AI is shorter than most people assume, and Mental Health will be among the domains deeply reshaped—whether through AI-assisted therapy, companionship relationships, or risks we're only beginning to understand. I want to help ensure that transformation improves rather than undermines human wellbeing.

MindApp Therapy

Founder & CEO

Jan 2023 — Present

  • Founded and built bootstrapped, profitable online therapy platform serving 380 patients/month at peak across Spain, USA, and Latin America with network of 22 therapists
  • Designed evidence-based protocols and policies through iterative real-world testing
  • Balanced therapy access, clinical quality, therapist autonomy, and business sustainability while growing therapist network through structured vetting and patient retention monitoring
  • Hired and managed 4-person customer service team
  • Built platform end-to-end using AWS, FastAPI, WhatsApp Platform, and Google/Meta ads

Startup Exploration

Independent Research

2022

  • WeSex (SexEdTech): Ran structured 2-month cofounder trial; identified product was pre-PMF
  • Adopted EA cause prioritization framework, pivoted to mental health based on tractability and personal fit
  • Stenox (Blockchain): Built bot and investment data analytics product; reached YC interview stage

Emi Labs (YC19)

Sr. Machine Learning Engineer

Oct 2019 — Jan 2022

  • Led NLP pipeline design and implementation for Chatbot (Rasa), with the mission of improving employment access for frontline workers
  • Coordinated company-wide knowledge-sharing talks with both internal and external speakers
  • Shaped product direction as fifth employee, including pragmatic scope decisions (e.g., eliminating unnecessary NLP classification when simpler solutions existed)

Mercado Libre (AMZ of Latam)

Data Scientist (Jr → Sr)

Dec 2016 — Oct 2019

  • Developed Collaborative Filtering Recommendation Models for millions of users (meta-prod2vec)
  • Built ETL pipelines processing billions of events daily and implemented monitoring infra
  • Built Sales KPIs reporting for CTR, conversion, attribution and coverage metrics
  • Developed deployment infra at scale

NeurIPS Presentation

ML Open Source Software Workshop

2018

Presented Ms. Thesis

Universidad de Buenos Aires

Master's in Computer Science

2013 — 2018

Thesis: PyLissom - A tool for modeling computational maps of the visual cortex in PyTorch

Data Science Argentina

Meetup Speaker

EA @ Buenos Aires

Regular Participant

Patch Adams Volunteer

Hospital Clown

What I've Built

MindApp Therapy

Founder & CEO

Jan 2023 — Present

  • Founded and built bootstrapped, profitable online therapy platform serving 380 patients/month at peak across Spain, USA, and Latin America with network of 22 therapists
  • Designed evidence-based protocols and policies through iterative real-world testing
  • Balanced therapy access, clinical quality, therapist autonomy, and business sustainability while growing therapist network through structured vetting and patient retention monitoring
  • Hired and managed 4-person customer service team
  • Built platform end-to-end using AWS, FastAPI, WhatsApp Platform, and Google/Meta ads

Startup Exploration

Independent Research

2022

  • WeSex (SexEdTech): Ran structured 2-month cofounder trial; identified product was pre-PMF
  • Adopted EA cause prioritization framework, pivoted to mental health based on tractability and personal fit
  • Stenox (Blockchain): Built bot and investment data analytics product; reached YC interview stage

Emi Labs (YC19)

Sr. Machine Learning Engineer

Oct 2019 — Jan 2022

  • Led NLP pipeline design and implementation for Chatbot (Rasa), with the mission of improving employment access for frontline workers
  • Coordinated company-wide knowledge-sharing talks with both internal and external speakers
  • Shaped product direction as fifth employee, including pragmatic scope decisions (e.g., eliminating unnecessary NLP classification when simpler solutions existed)

Mercado Libre (AMZ of Latam)

Data Scientist (Jr → Sr)

Dec 2016 — Oct 2019

  • Developed Collaborative Filtering Recommendation Models for millions of users (meta-prod2vec)
  • Built ETL pipelines processing billions of events daily and implemented monitoring infra
  • Built Sales KPIs reporting for CTR, conversion, attribution and coverage metrics
  • Developed deployment infra at scale

Academia & Community

NeurIPS Presentation

ML Open Source Software Workshop

2018

Presented Ms. Thesis

Universidad de Buenos Aires

Master's in Computer Science

2013 — 2018

Thesis: PyLissom - A tool for modeling computational maps of the visual cortex in PyTorch

Data Science Argentina

Meetup Speaker

EA @ Buenos Aires

Regular Participant

Patch Adams Volunteer

Hospital Clown