Prowess

All-in-one platform for Spanish-speaking personal trainers.

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April 15, 2026 3 friends, stable jobs, and a firefighter dream: How we built Prowess.

Hi Indie Hackers!

We wanted to share a story about how a side project can actually change a business. We are 3 friends from Spain—2 developers and 1 online coach. We all have stable, full-time jobs that we love, but we saw a problem that we couldn't ignore.

Our coach friend was struggling to manage his clients. He was drowning in spreadsheets and WhatsApp messages after his own work hours. It was a mess. So, we decided to spend our nights and weekends building a solution specifically for him.

The Challenge: Building a SaaS while keeping our 9-to-5 jobs.

The Result: Even with us working on it part-time, Prowess changed everything for our friend.

In just a few months, he has:

  • Tripled his client base.

  • Increased his monthly revenue by providing a more professional service.

  • Centralized everything so he can focus on his goal: studying for the firefighter exams (oposiciones de bombero) while running a successful business.

We realized that if we could help him scale his business while we all kept our day jobs, we could help thousands of other coaches in the Spanish-speaking market do the same.

We are now opening Prowess to the world. It’s the best way for Spanish-speaking coaches to grow without losing their minds in admin work.

We’d love your feedback on our landing page and how we are balancing a growing SaaS with our professional careers!


https://prowessapp.com/

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We realized that most personal trainers in the Spanish-speaking market are still juggling between WhatsApp, Excel, and Instagram to manage their clients. It's a mess that prevents them from scaling. We built Prowess to g