Our Team
The TestingTime Unicorns – all around the world


Reto Lämmler: CEO & co-founder TestingTime
Reto Lämmler

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 CTO & co-founder TestingTime
Oliver Ganz

Oli, a classic full stack ninja, joined TestingTime as a new Founder at the beginning of 2015. As TestingTime’s new CTO, he is responsible for the development and operations of the platform and the continued growth of the test user pool. He worked as a Software Engineer for doodle.com and helped the company grow from 5 up to 30 million unique visitors. Oli owns a master in computer science.

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.

Customer Success

Eva Head of Customer Success
Eva Bottana
Head of Customer Success

Eva joined TestingTime in mid-2015 as the first employee. Since then, as Head of Customer Success, she has put her heart and soul into ensuring the satisfaction of our customers. Not without reason, her automated counterpart is called Adam - our recruiting tool. Eva keeps her calm & overview even in hectic moments. She takes care of the orders of the customers as well as the support of our test users. At the latest with her initial training as a medical masseuse with a federal diploma, she has lost all fear of contact with people.

Andrea Customer Success Manager
Andrea Meier
Customer Success Manager

Andrea is supporting the customer success team since the beginning of 2018. She’s responsible for handling the orders of the customers and the competent support of the test persons. The customers and test users are for Andrea as important as her cacti, which she takes care of with the same carefullness. When she’s not taking care of the customers and testers, you can find her in the kitchen, where she likes to try out new recipes and cook for her friends and family. She has completed a business education including the matura and is currently continuing her education in this area.

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.


Dino Mastelic
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.

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.

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."

Guillaume Dozier
City Launcher

Before I joined TestingTime, I worked for French startups looking to develop their business in Canada.

Now, I help TestingTime's clients in France find the right test users for their research.

Outside of work, I fight climate change by planting trees with the non-profit organization I founded.

Also, I am a dog person.


Sandro Head of Marketing TestingTime
Sandro Meyer
Head of Marketing

Listen and learn. Sandro lives by this mantra as the customer advocate at TestingTime and in private as an avid reader, traveller, and chef. As Digital Marketing Manager, he is responsible for the international growth of the company and makes sure our customers have all the resources they need to conduct impactful user tests. Prior, Sandro developed his marketing chops while working at Apple and later revolutionised the culinary world as CMO of the Swiss food startup flatev. He graduated with a BSc in International Management.

Content Marketing Manager Tamara TestingTime
Tamara Marie Johnson
Content Marketing Manager

Born to two American orchestra musicians, Tamara was raised in Germany and Switzerland. To her parents' dismay, she does not share their passion for classical music. But she did inherit their musical ear which she later used to study linguistics. As the Content Marketing Manager at TestingTime, Tamara is combining all of her interests: digital marketing, language, and fitness (by biking to work). Her goal is to make TestingTime.com THE go-to place for quality user research content.


Product Manager Cosima Lefranc TestingTime
Cosima Lefranc-Brenner
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/UI Designer

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.


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 TestingTime
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.

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.

Picture: Mark Sandmeier - Verwaltungsrat TestingTime
Mark Sandmeier
Board Member

In 2015, Mark participated as investor in TestingTime's first financing round. The founder team was even more excited, when Mark also accepted to join the board of directors. As former CEO of the JobCloud AG (jobs.ch), he brings extensive experience and helps the company to make the right decisions at the right time. Mark also advices other startups and joined Picstars AG as startup CEO in fall 2016.

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.