Validate

Build and Validate Your Venture

Be one of the first startups to join Impossible Founders and get 1:1 mentorship, support, visibility, and access to resources.

Apply Now
iF Greenhouse
Man speaking to an attentive audience seated on wooden bleachers in a modern indoor setting.
Man speaking to an attentive audience seated on wooden bleachers in a modern indoor setting.
Program Overview

The Essentials

Everything you need to know about the format, schedule, and commitment.

Speaker in a white hoodie with text saying 'What if it's impossible' repeated and crossed out, presenting to a large audience seated on tiered wooden steps in a modern room.
Duration
Custom
Several weeks to several months
Commitment
+/- 1-2 hours per week
Participants
5-10 startups per round
Format
1:1 coaching, custom support
Intake
Rolling
Status
Applicants
Who It’s For
Who It’s Not For 

This program is for you, if you want to get hands-on, personalized support from Impossible Founders.

This program is not for you, if you want to join a long-term program with a fixed schedule and a rigid program framework.

Person in a lab coat and green gloves working at a laboratory bench with equipment and supplies, illuminated by under-shelf lighting.
Person in red jacket with a blue bag reading informational posters about telemedicine on a window overlooking a waterfront.
Program Purpose

From Lab to Startup

Deep Tech ventures often emerge from research environments or early founder
constellations. At this stage, ambition and technical excellence may be present, but business clarity, market validation, and an execution structure are often not. The iF Greenhouse closes this gap. It strengthens the quality of ventures, reduces risk in later programs, and creates a robust venture pipeline. Startups in the Greenhouse program immediately get feedback, support, and access to resources on a hands-on, customized basis, without much administrative overhead.

How It Works

Program Journey

While every founder moves at their own pace, the program follows a structured set of steps designed to support each startup’s individual needs.

Apply Now
Phone icon
1
Stage

Continuous Intake

We maintain an ongoing intake of high-potential ideas, founding teams, and early-stage startups. Selection is based on potential, ambition, and strategic fit.
Book icon
2
Stage

The Nurturing Phase

From day one, our team works directly with the founders. This is not about theoretical exercises; it's about building the business. Together, we refine the product, validate the business model, and prepare for growth. Our role is to actively provide the resources, network access, and expert guidance needed to make measurable progress.
People Icon
3
Stage

The Quality Gate

After this initial, intensive phase, ventures are assessed at our "Quality Assurance Gates." At these defined checkpoints, ventures are evaluated against clear readiness criteria to ensure they have developed significant traction and resilience. Those that pass are channeled into our structured programs: be it pre-incubation, incubation, or even the accelerator.
iF Greenhouse
Getting Started

Selection & Access

The first phase of the selection process is the same process for applying to our incubator or accelerator. For the Greenhouse program, we just pick promising startups out of the process and already start working with them while the incubation and acceleration selection process continues.

‍
To be considered, startups just need to fill in our application form. We then interview the founders of the most promising startups and/or clarify some follow up questions, before we make a decision within our dealflow team.
‍

Generally, startups in the Greenhouse program meet the following criteria:

  • Promising Deep Tech technology
  • Strong team
  • Motivation to work with Impossible Founders
  • It's clear how we can quickly help the startup

‍

Apply Now
Group of people attending a presentation in a modern room with large windows, some raising hands, and a screen showing a closing slide with a man's photo and contact information.
Your Guidance

Meet the Mentors & Coaches

Each team is paired with a dedicated internal mentor who guides them through the program, while additional external experts provide tailored support, introductions, and connections based on each team’s specific needs.

Sanna
Sanna
Impossible Founders
Priyanka
Priyanka
Impossible Founders
Andreas
Andreas
Impossible Founders
Join Our Mission

Take the Next Step

Shape the future of Deep Tech with us. Start today.

Apply Now
Back of a white hoodie with the phrase 'What if it's impossible' printed multiple times, each 'impossible' crossed out except the last one changing to 'possible'.