Our Team
The TestingTime Unicorns – all around the world


Reto Lämmler: CEO & co-founder TestingTime
Reto Lämmler
Co-Founder and CEO

Test early and often is Reto’s mantra for good Interaction Design. Reto started TestingTime at the beginning of 2013. As the CEO, Reto leads the vision and mission of the startup. Prior to TestingTime, Reto worked as an Interaction Designer and Usability Consultant with his own 58rocks GmbH. At doodle.com, he gained international startup experience as VP Product Management. He holds an MAS in Interaction Design and a BSc in Computer Science.

Oliver Ganz
Co-Founder and CTO

Oli is a classic full stack ninja. Since 2015 he gets up every morning to make TestingTime a step better. As TestingTime’s new CTO, he is responsible for the development and operations of the platform. If there is some time left, he spends it on a football field, playing the accordion or with dice in his hand playing DnD. He worked as a Software Engineer for doodle.com, where he fell in love with growth and helped the company grow from 5 up to 30 million unique visitors.

Dave Lieber
Dave Lieber
Chief Customer Success Officer

Customers and people are Dave’s heartbeat and he wants to create customers for life! His mission is to delight our customers with high quality services and turn them into loyal and great product evangelists. In Dave’s backpack we find, besides some smelly Swiss cheese, more than 20 years of experience in Services and Customer Success. His backpack is further packed with a survival kit consisting of his lovely wife, two little crazy girls and a bottle full of dreams in which he runs a boutique hotel in the middle of the Centro Storico in Florence, renovates houses, building furniture and writes a children’s book. Find out what Dave has to tell you, by watching this video interview.

Sandro Fulgheri, Chief Sales Officer
Sandro Fulgheri
Chief Sales Officer

Sandro is an experienced sales and marketing executive who grew up in the IT sector. The last 15 years he has grown several US based startups to a successful exit, mostly in the photographic and audio market but also in the services market. By doing so, Sandro has circled the world more often than a famous rockstar, setting up and managing teams in China, Singapore, Japan and Switzerland. He’s the type of person that can never sit still. So when he’s not running or cycling anywhere in the Swiss mountains, he’s strategising about how he can support his customers better and help them grow their business. Learn more about Sandro, by watching this video interview.

Customer Success

Corinne Schröttenthaler Customer Success Manager
Corinne Schröttenthaler
Customer Success Manager

Corinne is the latest addition to the TestingTime customer success team. After a long detour in the world of retail, where she ended up as a backstock manager, she began working in visual communication while studying. These experiences helped her to develop a proficiency for easy-to-understand, engaging communication approaches and general customer satisfaction. Corinne loves drawing in her free time and is constantly expanding her collection of antique jewelry.

Éléonore Doucet
Customer Success Manager

Before I joined TestingTime, I acted as an exports consultant for French companies exporting goods and services from France to Switzerland. Now, I support the customer success team, especially with our French-speaking clients and tests users. Outside of work, I do a lot of sports and love to travel. Cats are my favorite animals.

Céline Kaiser
Operations Administrator

Before joining TestingTime, Céline gained experience in various areas of the hospitality industry. During her studies in International Management, she worked in a customer care centre on the phone and answered all kinds of questions. In the Customer Success Team she can now bring all this experience to bear and ensure that customers, as well as test users, have a great experience with TestingTime. With her open mind and healthy curiosity, she loves to find new solutions for challenges. On Céline’s desk you will always find a good cup of tea and at least one plant that she is currently mothering. Get to know her a bit better in this short video interview.

Human Resources and Finance

HR Manager Gökhan Güldür TestingTime
Gökhan Güldür
HR Manager

With the rapid growth of TestingTime, Gökhan joined us after completing his studies in October 2018 as our new HR Manager. As a passionate karate coach, he also acts as a sparring partner, contact person and motivator in his spare time. He is responsible for recruiting employees with the right (TestingTime) DNA for our company and his target is to ensure the strategically and operationally best possible HR service to reach our goal of becoming # 1 in Test User Recruitment in Europe.

Oliver Müller Finance Controlling TestingTime
Oliver Müller
Finance & Controlling

Oliver has been responsible for Finance and Controlling at TestingTime AG since December 2018. He is happy when his Excel-sheets support management’s decision-making process by providing meaningful and forward-looking financial data. As guardian of the financial resources, he furthermore tries to promote budget-compliance with his colleagues. Oliver used to work as Head Reporting for an Investment Fund and got his accounting know-how from working with a Swiss non-profit foundation. He completed his degree MAS Corporate Finance CFO at FHNW.


Dino Mastelic
Senior Account Manager

Give it your all! That’s Dino’s credo. Whether in sports or at the office, he doesn’t know how to do less than 100%! Dino, who joined our sales team at the beginning of 2018, has several years of experience in account management and marketing under his belt. Tirelessly caring for our customers, his goal is that they are 100% satisfied, 100% of the time. Dino wouldn’t be Dino if he didn’t give it his all at school, too: he is currently studying business psychology in Zurich. In his spare time, he enjoys shooting hoops. But despite his passion for basketball, his free-throw rate isn’t where he wants it to be just yet.

Philip Stowe Business Development Manager UK TestingTime
Philip Stowe
Business Development Manager UK

Sporting mad Phil is ready to go that extra mile for his clients. Living just outside of London he can easily visit all our clients. Phil looks after our clients in the UK and joined the team in April 2018. He has over 10 years experience in sales and has worked in a variety of sectors. Phil will do all he can to help clients get the testing users and the outputs that they need for each project.

André Riner Senior Key Account Manager
André Riner
Senior Key Account Manager

Just like a teenager, André is eager to learn new things and meet new people. And it is to these traits that he owes his stellar career in market research, marketing consulting, and key account management. At TestingTime, André joins Dino in caring for our Swiss clientele. In his spare time, he enjoys spending time with his family and staying active: you will see him jogging, cycling, or coaching high school track and field teams. He’s also known to cheer his daughters on at handball tournaments.

Matthias Kase Team Germany TestingTime
Matthias Kase
Team Germany

Matthias has been working in the area of services for digital products for 4 years now. He is very familiar with the everyday challenges in agile work environments. Having joined the team at the beginning of 2019, Matthias, who lives in the Berlin metro area, is responsible for our German customers. All in all, he has 9 years of experience in various sales positions. Most recently, he worked at a startup in Berlin. If you’re looking for an easy way to recruit test users, get in touch with Matthias.

Matthias Holtz Team Germany TestingTime
Matthias Holtz
Team Germany

Based in Cologne, Matthias takes care of our customers in western Germany. Until recently, he made a living as an author and documentary filmmaker. When he joined the glamorous world of SaaS a couple of years ago, he was a little surprised at how much he liked it. “Consulting is more like filmmaking than you might imagine: you listen to people and try to get an idea of their situation and their challenges. And then you develop a solution that will please them.”

Alexis Gerome City Launcher TestingTime
Alexis Gerome
City Launcher

Being French-Brazilian, Alexis has always seen things from multiple angles, which enables him to connect the dots easily. Here at TestingTime, he is our bridge between Switzerland and the rest of the world. Launching new cities to make us a global Unicorn. A former UX Lead from the agency world, he has worked with many high profiles and international clients in Switzerland and Brazil, and, he is also an entrepreneur who has lived in 7 different countries like China, Australia and Brazil. Always up for a challenge, and to exploring new things makes him a passionated problem solver for turning the world a more user friendly place.

Ahmet Sakali
Team Germany

Easy to handle, ready to deliver. This applies to TestingTime and to me as well. Before I came to TestingTime, I was already here and helped to make TestingTime known throughout Europe. After a stopover in Data Driven Marketing, I am back in the team and look forward to picking up where we left off – establishing TestingTime as Europe’s #1 in Test User Recruitment. Outside of work, I enjoy being with friends or travelling, preferably in the sun and by the sea.


Ines Misura
Head of Marketing

Before joining TestingTime, I had the opportunity to develop as a marketer within different industries and in companies of different sizes. I have always put the expectations, needs and wishes of the customer at the centre of my work. I am happy to apply my previous expertise at TestingTime and also to acquire new knowledge. For me, standing still is not an option and, as is well known, the world belongs to the brave.

Maggy Mächler
Inbound Sales Manager

Before I joined TestingTime, I was a counter and education manager at L’Oreal Luxe. Today, I’m proud to be supporting the marketing team and putting my expertise into practice. Outside of work, I’m focused on getting my Bachelor’s degree in business psychology. My favourite vacation spot is Hawaii because I’ve got the Hawaiian spirit. Aloha!

Nora Schenker
Senior Marketing Manager

I am responsible for the Test User Pool at TestingTime. I make sure the pool contains the right test users to successfully meet our customers’ needs. This way, I am able to combine my interests in UX, data science and marketing perfectly. I completed my Master’s degree in media and communication science at the University of Zurich where I also worked as a research assistant. Before joining TestingTime, I was the Marketing Lead at a Swiss startup in the beverage industry. In my spare time I love to go on spontaneous trips, film my adventures and turn them into short videos.


Salvatore Senior Software Engineer TestingTime
Salvatore Iovene
Senior Software Engineer

Salvatore joined TestingTime’s core engineering team after a 12 year stint in Finland, where he worked on mobile platforms for Nokia and Intel. He has experience with a large array of systems and technologies, and hopes to bring fresh perspectives to the team. When he’s not writing code, he can probably be seen climbing alpine passes at ludicrous speed on his road bike.

Ion-Alexandru Ursachi
Software Engineer

With a passion for software craftsmanship and constantly looking to expand his knowledge, Alex moved to Zurich in search for new challenges. Joining TestingTime’s engineering team was an easy decision as it was a fit for his skills and personality. Apart from coding, he enjoys spending time with his family or listening to music. Alex graduated with a Bachelor in Computer Science and worked as a Software Engineer for about 8 years before joining TestingTime.

Wei Liu
Front-End Developer

Wei joined TestingTime as a front-end developer in mid-2019. She is experienced in web application development and is passionate about advanced technologies. In her spare time, she likes traveling and photography. Before joining TestingTime, Wei lived in the United States for about 5 years. During that time, she got her Master’s degree in Electrical Engineering and worked as a full-stack developer building a SaaS platform.


Product Manager Cosima Lefranc TestingTime
Cosima Lefranc
Head of Product

Creating a great technological product from beginning to the end is Cosima’s job at TestingTime. With a dual background in Business Intelligence and Quantitative Finance, Cosima is on a constant quest to find new data-driven insights from our product usage. She enjoys talking to our users and discovering new ways in which we can help them become more successful. In her free time, she loves to try every possible apps you could imagine, speaks 3 languages fluently and she has travelled to more than 50 countries. Cosima graduated with a Bachelor in Economics and a Master in Quantitative Finance from the University of St. Gallen.

Janine UX Designer TestingTime
Janine Totz
UX Architect

Create wonderful user experiences – that’s Janine job at TestingTime. She has formerly worked as a Head of Design at an advertising agency and developed a lot of user interfaces, graphics and screen designs. That’s why she completely understands how to challenge products and services and how to optimize them both content-related and in appearance. Ever since she has lived in Lucerne she is totally hooked by their famous carnival. Plus, her passion for playing the drums have inspired her to join and actively participate in one of the music groups. Janine has studied print and media technology in Berlin and is a certificated BEng.

Beatriz Gomez Perez
Digital Product Designer

Before I joined TestingTime, I have done quite diverse jobs. I worked as UX/UI Designer for SaaS B2B cybersecurity start-up dedicated exclusively to the creation of software for SOCs (Security Operations Center). After that I joined DDB, an important international communication company, as UX/UI Designer for SEAT in Barcelona. Outside of work, I love to go to pottery classes and leave the screen for a while to improve my creativity with my hands.

Council of wisdom

We are very proud to have well known people from the scene on board with us. As startup founders you do most things the first time. To get advice from people who tackled similar challenges in the past is very helpful to us.

Twan Vollebregt
Board Member

Twan joined TestingTime’s board in 2018 as part of the second financing round. As a successful serial entrepreneur and senior executive, he has already taken two startups from idea to exit and is currently working on his third. This full-cycle experience has taught him the importance of vision and strategy, and Twan will take any opportunity to discuss product & commercial strategy in particular.

Cristian Grossmann
Board Member

Cris is the CEO and Co-Founder of Beekeeper, an award-winning digital workplace app that digitizes the non-desk workforce in 137+ countries by connecting operational systems and communication channels within one intuitive platform. Prior to founding Beekeeper, Cris worked for Accenture on high profile international projects in the field of IT Strategy for the financial and public sectors. Cris studied Chemical Engineering and got his Ph.D. in Electrical Engineering, both at ETH Zurich. Before moving to beautiful Zurich, Cris was born and raised in an entrepreneurial Swiss-Mexican family in Mexico City.

Picture of Eric Reiss - Advisor at TestingTime
Eric Reiss
Advisory Board Member

Our business advisor Eric’s first usability testing took place when he was three years old – he talked his mother into modifying a rocking horse so it didn’t rub his knees. Ever since, he has never accepted things as they are, but has always worked to make things better. Today, he is an internationally recognized expert in usability and user-experience design. His best-selling book, Usable Usability, is now available in four major languages – English, German, Chinese, and Japanese.