We make world-class coaching
accessible to every professional
Growth happens when people feel supported enough to try, safe enough to fail, and guided enough to improve. That is what Sleak is built for.
We are hiring!Join our team
We started Sleak because the best sales training in the world is still the hardest to scale. A great coach can transform a rep, but no manager has time to sit in on every call, every week, for every person on the team.
So we built one that does. Sleak gives every rep a patient, expert sparring partner that’s available on any device, at any hour, and never runs out of patience. It’s the practice we always wished we’d had – and the kind that compounds quietly, conversation after conversation.

Company impact by the numbers
The numbers below cover what matters day to day: how quickly teams are ready, how often they can practise, and how much experience goes into every piece of feedback.
- +46%
- Sales performance increase
- 50+
- Reps onboarded
in 5 weeks - 1,000+
- Sales experts' knowledge built into every feedback loop
- 24/7
- Practice availability,
on any device
Help us build the AI coach that develops teams
Explore career opportunitiesWhat we believe
Three principles that shape every conversation we build.
Practice beats theory
Skill comes from reps, not slide decks. We make deliberate practice effortless.
Feedback should be fair
Every rep gets objective, consistent coaching, not just whoever the manager had time for.
Built for your world
No generic scripts. Every scenario reflects your product, market, and buyers.
Our story so far
From a single idea to a sales-training platform trusted across Europe
- Sep 2025Launched Sleak
- Oct 2025Launched MVP
- Nov 2025Signed First Customer
- Jan 2026Hired First Employees
- Feb 2026Bootstrapped to 500k ARR
- Apr 2026Sleak Rebranding
- Jul 202620 Employees
Some faces behind Sleak
Some of the people building Sleak – and the question we work on: how does practice actually turn into skill?

Philipp Heideker
Co-Founder & CEO

Lennard Greve
Co-Founder & CTO

Till Kemper
Founding Engineer

Vinzenz Maier
Senior Account Executive

Marlene Bleek
Founding GTM Manager

Frederik Antenbrink
Founders Associate

Nela Greve
Founders Associate
We are hiring!
Explore careers
What the press writes about us.
Awards, coverage and appearances – a selection. Every link goes straight to the outlet's own piece.
YouTubeWatch videoSales Summit 2025 Startup Pitch – Sleak
Dec 14, 2025
VC MagazinView articleHeilbronn Slush'D 2025 Recap
Nov 4, 2025
Startup Valley NewsView articleHeilbronn Slush'D 2025: Europe's One Driving Force
Oct 31, 2025
