The best ideas deserve
all-in execution.

Individually incredibly strong — together, unbeatable! 🚀 Juli and Nathi have supported me as the founder of flatsforfriendz from day one. And let me be clear: without them, flatsforfriendz wouldn’t be where it is today. Each brings a unique, complementary skill set across business, product, design, tech, and marketing. On their own, impressive — together, unstoppable. Working with them gave me peace of mind and constant inspiration. Ideas were challenged, refined, beautifully designed, tested, and built — end-to-end. Anyone who’s built something knows how rare and valuable that kind of full-funnel skill set is. Within days, what started as a client-service relationship turned into a real friendship. You can trust this powerhouse with anything — their drive for excellence is unmatched. I’m available for reference calls 24/7. It was a true honor!
Alexander Weiss
Founder @ flatsforfriendz
The collaboration with Juli and Nathi could not have gone better for us. Both were absolutely committed from the day we met. At all times we had the feeling that they fully understood the challenges and were able to generate the best possible output. The project coordination was effective, we were always kept up to date and there was plenty of room for feedback. We look forward to working with Juli and Nathi again in the future.
Stefan Wörner
Co-Founder @ guidable
Working with Nathi and the DoubleDown Studio team was a game-changer for us. Their unique blend of technical expertise and creative insight transformed one of our clients into happy clients, without any briefing or former ramp-up. Hands-on, 100% execution, from the get-go. Nathi's commitment and professionalism was evident. Her ability to navigate complex challenges and deliver innovative solutions made the entire process seamless. We're grateful for their partnership and highly recommend them to any startup looking to bring their ideas to life, any time, 100%. Great job guys!
Johannes Mansbart
Founder @ chatarmin & armin.cx
Juli and I worked together to conceptualise and design the first MVP for Conlio. As an Interim Product Lead, she took full ownership of the product development and actively drove it forward. It was a huge advantage that she’s not only highly structured and hands-on but also incredibly skilled in design, which made collaborating on the UX/UI both seamless and efficient. I’d love to work with Juli again anytime, her positive and motivated attitude makes collaboration not just productive but truly enjoyable!
Felix Haas
Designer @ Lovable & Creandum
I've had the pleasure of working with Juli on multiple projects during her time at Sonic. What truly sets her apart is her ability to combine both creative design, user empathy, and overarching business goals which consistently resulted in her making a meaningful difference on the products she works on. She is an excellent product manager who is deeply empathetic and a strong advocate for users. Apart from that, Juli is just a super energetic person with lots of curiosity and creativity that is truly a joy to work with and lifts the team spirit. I'd love to work with Juli again anytime.
Lukas Minnebeck
Co-Founder @ Sonic & Superscale
Juli is one of the best product managers I’ve worked with, fully committed to unlocking a product’s potential and driving its success. She deeply understands the product, its users, and their needs while excelling at conceptualizing and designing features from scratch. Her ability to blend strategy with execution sets her apart. Together with Nathi’s technical expertise, they are a true product powerhouse—a “Swiss Army Knife” for anyone eager to launch a great idea.
Marvin Splitt
Founding Engineer @ flatsforfriendz

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The best ideas deserve
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SAY HI

OUR LATEST INVOLVEMENTS

double down

[ dub-bell doun ]
verb

our hearts beat a little faster for startups, so if

OUR STACK

Tools we love

OUR SERVICES

The best ideas deserve
all-in execution.

SAY HI

double down

[ dub-bell doun ]
verb

our hearts beat a little faster for startups, so if

OUR STACK

Tools we love

OUR SERVICES

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