doubledown studio - all things design, product & tech

Back

What people say
about working with us.

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!

Individually incredibly strong — together, unbeatable! 🚀 Juli and Nathi have supported me as the founder of flatsforfriendz from day one. Without them, flatsforfriendz wouldn’t be where it is today. Both bring 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.

Juli and Nathi have supported me as the founder of flatsforfriendz from day one. Without them, flatsforfriendz wouldn’t be where it is today. Both bring 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, You can trust this powerhouse with anything — their drive for excellence is unmatched. I’m available for reference calls 24/7.

Alexander Weiss

Founder @flatsforfriendz

From our first call, Juli and Nathi gave me the confidence that our project was in the best possible hands.  
As Product & Design Lead of Storytide, Juli owns many different topics at once without ever losing sight of the strategic goals and the bigger picture.     What I value most is her constant willingness to go the extra mile and step into areas beyond her actual scope - to support me and have my back.     I’m genuinely very happy with the collaboration and look forward to everything that’s still to come.

Celine Flores Willers

CEO @ The People Branding Company

We came to doubledown with a rough idea - Juli & Nathi turned it into a real-deal app: clean, and intuitive.
They dove in, asked sharp questions, and uncovered details we hadn’t even put into words. They didn’t just understand the complexity; they streamlined it.
If you want a UX crew that can turn napkin sketches into something delight- and meaningful, doubledown is your team.

Paul Oswald

Co-founder @ morningcrunch

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

Founder @guidable

High quality, high design, high energy. I'm a big fan of working with Nathi and Juli. Two creative souls, super professional. We are super happy with their eye for detail and the perceived simplicity of their designs. They put their heart and soul into it and the result is just really good.

Federico De Ponte

Founder @SCAILE Technologies

The project with doubledown was a great experience from start to finish. Juli and Nathi quickly understood our vision and came to a great output, despite the complexities of the product. The two proofed their communication skills with all involved stakeholders and implemented our feedback without compromising on their style of work and expertise. We are really happy with the outcome, exited to implement it and it is certainly not our last project with doubledown.

Christopher Mosca

Digital Products @ MOSCA

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

Working with doubledown 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 & 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%.

Johannes Mansbart

Founder @chatarmin & armin.cx

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 creative design, user empathy, and overarching business goals which consistently resulted in her making a meaningful difference on the products she works on. She's 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 & 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

I had the pleasure of working closely with Juli for over half a year, and I can confidently say she is among the best product managers I have ever encountered. She demonstrates a genuine commitment to bringing out the full potential of every product. Not only does Juli excel at understanding the product, its users, and their pain points and needs - she also has a remarkable ability to conceptualize and design new features from the ground up. I'd love to work with Juli again and can recommend her to anyone with a promising idea and is eager to launch it successfully.

Marvin Splitt

Founding Engineer @flatsforfriendz