5G Studie

The Company seim & partner

We offer

Intelligent conception and planning of fiber network infrastructure as well as consultancy services for strategy, technology, product management and business modeling for telecoms.

Our customers

are telecommunication companies, regional municipalities and investment funds

We support

our clients in an comprehensive approach in all topics covering network deployment, operations, documentation as well as strategy & business development and technology.


The company was founded in 2006 by Kai Seim as an engineering and planning company specializing in the rollout of fiber optics.

Since then, we have provided our customers with advice and support in over 300 telecoms projects.

With the continued expansion of our business, the company's headquarters were relocated in 2017 to new offices in Wiesbaden.


seim & partner is a member of the following industry associations. These memberships enable us to ensure that we can actively contribute to technical and regulatory developments in the telecoms industry.



Kai Seim

Founder and Managing Director

Kai Seim is the Founder and Managing Partner of seim & partner and is responsible for corporate development, customer management and product development.

As a graduate of TU Berlin (Technical University of Berlin), Kai Seim is a certified computer scientist and prior to founding seim & partner held a management position in IT at the Gerling Group (insurance) before accepting a senior leadership position in engineering at T-Systems. His main areas of responsibility are currently business development, network planning, network architecture and IT for broadband networks, in particular in the area of fiber-optic networks.

Kai Seim regularly publishes articles on broadband and fiber-optic issues and is currently an active member of two VDE (Association for Electrical Engineering, Electronics and Information Technologies) working groups devoted to the standardization of fiber-optic infrastructures. He also sits on the Program Committee for the VDE Broadband Conference and is a member of the ITG (Information Technology Society) Expert Group 5.2.5. dedicated to access and home networks.

We are driven by our customers' needs to find intelligent and ready-to-market solutions which add value.

Thomas Brandt

Managing Director

Thomas Brandt has been the Managing Director at seim & partner and is primarily responsible for corporate, employee and portfolio development.

After graduating from the Friedrich-Alexander-Universität Erlangen-Nuremberg with a degree in Business Administration, Thomas started his career in a trainee program at Olivetti Systems & Networks. He went on to accept various positions in Key Account Sales at Olivetti and later Digital Equipment. With the liberalization of the telecoms market, Thomas moved to DBKom to head up the Key Accounts division. DBKom later became Mannesmann Arcor. At Arcor, Thomas held various management positions and was also Managing Director and a member of the Supervisory Board for holdings. He was most recently responsible at Arcor for the company's Business Customers division. In 2011, Thomas moved as an executive to a medium-sized IT systems house where he was responsible for the Infrastructure and IT Services division.

A strong culture and strong employees are key to success in the marketplace!

Team/Areas of Responsibility

An interdisciplinary and multinational team composed of geographers, (geo-)computer scientists and civil engineers is specifically put together for each project based on the members expertise. We have over 50 years combined experience in planning fiber-optic networks and in construction management. Our employees are assigned to the centers of excellence below.