WiFi site survey in Hamburg.

Construction varies sharply from one Hamburg street to the next. A traditional brick office block can have thick walls and many small rooms that absorb signal, while a recent waterfront building may be mostly glass with coated panes that reflect it. A predictive model built on default wall settings can be wrong in both cases. Surveying on site, or at least checking materials during a short visit, shows what the structure really does to the signal before access points are bought. The result is a plan that reflects Hamburg buildings as they are, with fewer surprises once the cabling and mounting work begin.

The working environments are also varied. Port-related yards and warehouses involve stacked goods, metal racking and moving vehicles, and handheld scanners and vehicle terminals need reliable roaming rather than just a strong signal. Media studios and aerospace halls bring large open volumes, high ceilings and heavy equipment that interferes with wireless. Neighbouring networks in dense inner districts can fill the channels, so measuring interference in place is as important as the coverage map itself. A validation survey after installation then confirms that roaming holds up along the routes people and vehicles actually take.

Hamburg's IT estate follows the shape of the city. The port, the freight forwarders and the shipping offices run systems that cannot stop for the night, while media houses, aerospace suppliers and energy companies add their own server rooms and production networks. Colocation and hosting facilities serving Hamburg may sit on the edges of the urban area or closer in, so a typical job means crossing the city between an office, a logistics site and a hosting facility. Companies headquartered elsewhere often keep a Hamburg branch or terminal with no IT staff of its own.

The physical setting adds its own demands. Hamburg is a low-lying city on the Elbe, threaded with canals and waterways, with a damp, windy climate and a harbour that brings salt air and heavy goods traffic. Old brick warehouse and office buildings stand beside new glass developments in HafenCity, and the two behave very differently when you need to pull cable, mount equipment or plan a wireless network. The city works on Central European Time, so it shares its working day with most of Europe.