About us

Simon Ceña

Certified fiduciary expert / managing director

As an entrepreneur and fiduciary expert, I know the opportunities and challenges that SMEs face on a daily basis. As a managing director and sparring partner, I bring this experience to the collaboration with other entrepreneurs - from strategic tax advice to the role of external CFO.

My approach combines analytical acuity with creative solutions. This results in customized financial strategies that are precisely tailored to the needs and goals of our clients. Together, we create a solid foundation on which your company can grow and develop sustainably.

Philipp Morf

Fiduciary with federal certificate / Deputy Managing Director

"Not everything that counts can be counted, and not everything that can be counted counts" was once given to me. In an industry where everything ultimately revolves around money, this is something I want to take to heart. After six years of gaining exciting experience in a tax law firm/consultancy, I am looking forward to working with a great team for adminster ag and its clients.

Oliver Bürki

After completing my business studies in Zurich and Lucerne, which I did while working full-time, I was able to gain valuable experience over several years as a financial controller and sole accountant.

During this time, I decided to continue my education as an expert in accounting and controlling, which I successfully completed in April 2024. During this time, I realized that I missed the broader world of finance. Now I am looking forward to the new challenges that the fiduciary industry presents me with, and I will go the extra mile to provide adminster ag and its clients with profitable advice and long-term support.

Besjan Djaferi

Business economist FH i.A. / Mandate manager

During my first year of training, it became clear to me that numbers and I would remain friends for many years to come. After successfully completing my three-year training as a business administrator with an M profile in the fiduciary sector, I decided to study business administration at the FHNW in Olten. At the same time, I worked as a fiduciary clerk in an SME in the canton of Bern. During this time, I was able to acquire the skills to ensure the financial integrity of companies. Now I am looking forward to working as part of the team to advance adminster ag and serve customers as a confident point of contact.

David Sieber

Bsc. Accounting, Controlling and Auditing / Client Manager

After my training as a businessman and my previous work in the auditing and fiduciary sector, I am particularly pleased to be able to expand and share my knowledge and experience at adminster ag. I have been fascinated by the diversity of the fiduciary sector since the beginning of my professional career and I am delighted to be able to share this fascination with adminster ag and its clients.

Lucas Matzinger

Bsc in Business Administration in Controlling & Accounting

SMEs are the backbone of the economy—their importance inspires me every day. With my bachelor's degree in accounting, controlling, and finance, as well as my previous experience in auditing, I look forward to contributing and further expanding my knowledge and practical skills at adminster ag. I particularly appreciate the direct contact with customers, as personal consultation and creating added value for their companies are very important to me, and I contribute to the stability and success of their business activities through tailor-made solutions.

Laura Grob

Bsc. Finance and Banking / Client advisor

I don't have the traditional background of a trustee, but rather the client's perspective. Thanks to my experience advising clients at a bank and in a start-up, I know their needs inside out. With my training in the financial sector, I look forward to providing our diverse clients with personal and competent support.

Til Sommer

Business economist HF i.A.

I completed my commercial training in 2020 and then gained practical experience in accounting at a marketing company. Fascinated by the diversity of work in fiduciary eager to learn more, I decided to switch from the client side to the fiduciary side. I am looking forward to contributing my knowledge at adminster and developing my skills in this area even further.

Simon Hehli

Finance and accounting specialist (retired)

Fascinated by the world of numbers—that's how the people around me would describe me. Added to this is my motivation to always fiduciary a little deeper into fiduciary matters and learn new things. That's why I find working at adminster so fascinating, as it offers the perfect combination of insights into the world of business from all angles and working with numbers. All this, seasoned with a pinch of humanity in a young, dynamic team, makes every working day something special.

Julia Willi

After completing my training as a commercial clerk EFZ with an M profile and further training as an accounting clerk, I discovered my passion for the fiduciary sector. I am delighted to be part of the adminster ag team, providing our clients with comprehensive and dedicated support. Precision, structure, and partnership on equal terms characterize my work. This results in sustainable solutions for long-term success.

Nicola Oetiker

In the summer of 2025, I fiduciary completed my commercial training in the field fiduciary . I find fiduciary services particularly fascinating due to their versatility and close connection to numbers. I look forward to continuously expanding my knowledge and developing both professionally and personally. 

Michel Bien

I was already able to complete my internship at adminster as part of my commercial training. adminster is the perfect fit for me, as I am very fascinated by figures and the fiduciary sector in general. I am currently completing the "Accounting Clerk" course.

Naomi John

Business economist FH i.A. / Office Manager

With my passion for structured work and entrepreneurial thinking, I support our team in various areas. In addition to my work, I am studying Business Administration with a specialization in Strategy and New Business at the FH OST. I also run my own start-up, which gives me valuable entrepreneurial experience. I look forward to contributing my knowledge and skills and implementing successful projects together.

We are looking for you!

We are always happy to receive unsolicited applications from fiduciaries who have a passion for precision and structure. We also welcome committed career changers with a high level of intrinsic motivation to learn new things and develop their skills in a dynamic environment.

Become a part of adminster.

If you would like to apply, please send me an e-mail.

what customers say about us

"With humor and joy!"

I founded my company with adminster.
I am very satisfied!
Will now continue to work with them.

M
Michael Dettwiler

adminster then gave us a helping hand with their expertise and ensured that we no longer just had the right turnover, but that our accounting was also in line with legal requirements.

If you are looking for a partner in the area of finance and accounting who can ensure that everything in this area is as it should be in an uncomplicated and independent manner, then adminster is an ideal partner.

H
Hans Geeler

Very professional and reliable service. The adminster team works quickly and precisely and offers expert advice. We have been working with them since the beginning and have been able to see how a start-up has become a really great SME. I am very satisfied with the collaboration and can recommend the service without reservation!

M
Marco Licini

We have been working with adminster since this year and are surprised by the good quality. By quality we mean digital processes, direct communication and excellent advice at a fair price. Absolutely top!

P
Physio Schenk

Professional support in all areas with extremely friendly people. I can recommend adminster fiduciary who wants straightforward, competent, and reliable support.

M
Madleina Speich

I have been working with adminster for years and am completely satisfied. Whether accounting, payroll administration, taxes or business consulting - I always receive competent, fast and reliable support. The collaboration is personal, professional and solution-oriented. For me, they are the first port of call for all financial and administrative matters. Highly recommended!

S
Sat To

We have been working with adminster for over 1.5 years now. They do most of the bookkeeping for us. The cooperation with Simon and his team is very competent, reliable and on an equal footing. We are very satisfied!

J
Jesse Gerner

I've been working with Simon and his team for almost 3 years now. It has been a pleasant experience all the way. As a lean start-up, we try to do the maximum by our own (As it is the cheapest). Simon supported us in this effort and never gave me the feeling of being a complete newbie (despite making many and repetitive mistakes). I recommended Simon already to multiple other start-ups and companies and had great feedback from them as well.

C
Charly Stahl
Tired of bookkeeping?
We have an idea!
Straightforward fiduciary and tax-
e solutions for SMEs
Payroll
Accounting for startups
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Between Christmas and New Year, from 24.12-4.1.2026 we take a break and can only be reached in emergencies at info@adminster.ch.
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