Company lists · Data refreshed September 2026

Top 25 Telecommunication engineering firms based in Germany

Name: Telecommunication engineering firms based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 774 companies tracked

RevenueBase identified 774 telecommunication engineering firms headquartered in Germany as of September 2026 and tracks 6,485 professional contacts across them, including 2,416 with verified work emails. Berlin is the largest hub.

This list covers telecommunication engineering firms headquartered in Germany, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

774Companies

6,485Contacts tracked

2,416Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest telecommunication engineering firms based in Germany

Ranked by team size

Top 25 of 774 telecommunication engineering firms based in Germany, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunication engineering firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Axians Germany	Indirect evidence	Frankfurt, GermanyHQ checked Sep 30, 2026	1,001-5,000	403 contacts →
	Indirect evidence “AXIANS is the corporate brand for network infrastrucutures and corporate communications of VINCI Energies, one of the leading European providers of energy and information…” Source: RevenueBase Database · checked Sep 30, 2026
2	Plusnet Gmbh	Indirect evidence	Cologne, GermanyHQ checked Sep 30, 2026	201-500	248 contacts →
	Indirect evidence “Die Plusnet GmbH, eine Tochtergesellschaft der EnBW, ist ein deutsches Telekommunikationsunternehmen mit Fokus auf Geschäftskunden.” Source: RevenueBase Database · checked Sep 30, 2026
3	Medialine Group	Indirect evidence	Bad Sobernheim, GermanyHQ checked Sep 30, 2026	501-1,000	246 contacts →
	Indirect evidence “Welcome to Medialine AG – your IT & C system house.” Source: RevenueBase Database · checked Sep 30, 2026
4	Spie ICS Spie Information & Communication Services Gmbh	Indirect evidence	Hanover, GermanyHQ checked Sep 30, 2026	1,001-5,000	212 contacts →
	Indirect evidence “Als zuverlässiger Partner mit einer breiten Technik-Expertise in den Leistungsfeldern IT Solutions, Unified Communication & Collaboration Solutions und Security Technology…” Source: RevenueBase Database · checked Sep 30, 2026
5	STF Gruppe	Indirect evidence	Dülmen, GermanyHQ checked Sep 30, 2026	501-1,000	185 contacts →
	Indirect evidence “Die STF Gruppe ist ein international aktives Ingenieurunternehmen.” Source: RevenueBase Database · checked Sep 30, 2026
6	Phoenix Engineering	Partial evidence	Cologne, GermanyHQ checked Sep 30, 2026	501-1,000	181 contacts →
	Partial evidence “Phoenix Engineering Group is the leader in the field of broadband technologies and infrastructure.” Source: RevenueBase Database · checked Sep 30, 2026
7	Insyte Deutschland Gmbh	Indirect evidence	Ratingen, GermanyHQ checked Sep 30, 2026	201-500	177 contacts →
	Indirect evidence “Bei Insyte Deutschland arbeiten wir daran, unseren Kunden qualitativ hochwertige Dienstleistungen im Bereich der Installation, des Betriebs und der Wartung von Netzwerken und…” Source: RevenueBase Database · checked Sep 30, 2026
8	Ostertag Detewe	Indirect evidence	Düsseldorf, GermanyHQ checked Sep 30, 2026	201-500	153 contacts →
	Indirect evidence “Transform your business DeTeWe Communications have many years of experience in delivering tailored, integrated solutions for their clients internationally 365 days a year, 24…” Source: RevenueBase Database · checked Sep 30, 2026
9	Circet Deutschland SE	Indirect evidence	Bergisch Gladbach, GermanyHQ checked Sep 30, 2026	1,001-5,000	134 contacts →
	Indirect evidence “WER WIR SIND Die Circet Deutschland SE ist ein Unternehmen der Circet Group, dem führenden weltweiten Dienstleister für den Aufbau und die Wartung von…” Source: RevenueBase Database · checked Sep 30, 2026
10	Rosenberger-Osi Gmbh & Co. OHG	Indirect evidence	Augsburg, GermanyHQ checked Sep 30, 2026	501-1,000	125 contacts →
	Indirect evidence “Since 1991, Rosenberger Optical Solutions & Infrastructure (Rosenberger OSI) has been a recognized expert for fiber-based connectivity, cabling solutions and infrastructure…” Source: RevenueBase Database · checked Sep 30, 2026
11	Telcat Multicom Gmbh	Indirect evidence	Salzgitter, GermanyHQ checked Sep 30, 2026	501-1,000	117 contacts →
	Indirect evidence “Unsere TELCAT Gruppe zählt nicht umsonst zu den größten ITK-Systemhäusern Deutschlands.” Source: RevenueBase Database · checked Sep 30, 2026
12	Mugler SE	Indirect evidence	Oberlungwitz, GermanyHQ checked Sep 30, 2026	501-1,000	115 contacts →
	Indirect evidence “Bei der MUGLER SE dreht sich alles um Telekommunikation.” Source: RevenueBase Database · checked Sep 30, 2026
13	S-Kon Gruppe	Indirect evidence	Hamburg, GermanyHQ checked Sep 30, 2026	501-1,000	92 contacts →
	Indirect evidence “Seit 2003 sind wir erfolgreich als Fullservice Dienstleister in der Telekommunikationsbranche tätig.” Source: RevenueBase Database · checked Sep 30, 2026
14	Zener Telekom Gmbh	Indirect evidence	Kriftel, GermanyHQ checked Sep 30, 2026	201-500	85 contacts →
	Indirect evidence “Grupo Zener ist seit über 35 Jahren eine der führenden Anlagenbaufirmen in den Bereichen Mobilfunk, Glasfaserinstallation und erneuerbare Energien in spanischsprechenden Märkten…” Source: RevenueBase Database · checked Sep 30, 2026
15	Vitronet Gruppe	Indirect evidence	Essen, GermanyHQ checked Sep 30, 2026	1,001-5,000	68 contacts →
	Indirect evidence “Als Firmengruppe gemeinsam stark: Mit mehr als 2.700 Mitarbeitenden an über 40 Standorten sind wir deutschlandweit der führende Dienstleister für die Telekommunikations- und…” Source: RevenueBase Database · checked Sep 30, 2026
16	HKT Gmbh	Partial evidence	Bochum, GermanyHQ checked Sep 30, 2026	201-500	62 contacts →
	Partial evidence “Als eines der führenden Unternehmen in den Bereichen Engineering und Operations sorgen wir bundesweit sowie auch international für funktionierende Infrastrukturen im Festnetz- und…” Source: RevenueBase Database · checked Sep 30, 2026
17	Brainotech IT Solutions Gmbh	Indirect evidence	Weende, GermanyHQ checked Sep 30, 2026	51-200	56 contacts →
	Indirect evidence “Brainotech IT Solutions offers new IT and network solutions to business markets across a broad variety of regulated IT support services to its global clientele.” Source: RevenueBase Database · checked Sep 30, 2026
18	Sinnwell Gmbh	Indirect evidence	Munich, GermanyHQ checked Sep 30, 2026	51-200	55 contacts →
	Indirect evidence “Sinnwell GmbH ist ein schnell wachsendes Unternehmen, welches für Generalunternehmer im Mobilfunkbereich Dienstleistungen für den Netzaufbau erbringt.” Source: RevenueBase Database · checked Sep 30, 2026
19	Bitconex Gmbh	Indirect evidence	Munich, GermanyHQ checked Sep 30, 2026	51-200	43 contacts →
	Indirect evidence “About BITConEx Since 2008, BITConEx has been synonymous with excellent IT architectures utilising the latest technologies and standards, as well as in-depth process expertise…” Source: RevenueBase Database · checked Sep 30, 2026
20	Syserso Networks Gmbh	Indirect evidence	Hanover, GermanyHQ checked Sep 30, 2026	51-200	43 contacts →
	Indirect evidence “Syserso Networks realisiert mit mehr als 25 Jahren Erfahrung zukunftssichere Telekommunikationsnetze für öffentliche und private Netzbetreiber.” Source: RevenueBase Database · checked Sep 30, 2026
21	Libra Gmbh	Indirect evidence	Steinfurt, GermanyHQ checked Sep 30, 2026	501-1,000	36 contacts →
	Indirect evidence “Libra Gmbh ist eine Geschäftseinheit als Vehikel für ausgebildete und erfahrene Fachleute in der Branche für den Bau von Glasfasernetzen, wo sie ihre Fähigkeiten und Kreativität…” Source: RevenueBase Database · checked Sep 30, 2026
22	Netcom Connected Services Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 30, 2026	51-200	33 contacts →
	Indirect evidence “Die Netcom Connected Services GmbH ist ein dynamisches Unternehmen im Bereich Nachrichtentechnik/Kommunikationslösungen, insbesondere für Kunden mit hohen Ansprüchen an die…” Source: RevenueBase Database · checked Sep 30, 2026
23	Evoila Networks Gmbh	Indirect evidence	Fürth, GermanyHQ checked Sep 30, 2026	11-50	32 contacts →
	Indirect evidence “Firmenprofil Impressum: Über HOB: Gegründet wurde das Unternehmen HOB 1964 von Horst Brandstätter.” Source: RevenueBase Database · checked Sep 30, 2026
24	Termath AG	Indirect evidence	Wolfsburg, GermanyHQ checked Sep 30, 2026	51-200	30 contacts →
	Indirect evidence “Die TERMATH AG liefert maßgeschneiderte Lösungen im Bereich Kommunikationssysteme, Netzwerksysteme und Sicherheitssysteme sowie Service für Gewerbe, Industrie- und Großkunden.” Source: RevenueBase Database · checked Sep 30, 2026
25	Telesys Kommunikationstechnik Gmbh	Indirect evidence	Breitengüßbach, GermanyHQ checked Sep 30, 2026	51-200	28 contacts →
	Indirect evidence “Wir sind TeleSys - communication for business Frankens größtes, herstellerunabhängiges Systemhaus.” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: telecommunication engineering firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names telecommunication engineering firms.
Partial evidence: Its own public description names part of telecommunication engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecommunication engineering firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 774 telecommunication engineering firms based in Germany

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,416 reachable decision-makers.

Free signup · no credit card

View the full list →

Telecommunication engineering firms based in Germany at a glance

As of Sep 30, 2026

37.3%Verified-email coverage

8.4Average contacts per company

1-10Median size (employees)

7.1%Largest-city concentration · Berlin

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

399

11-50

233

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 774 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among telecommunication engineering firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Germany whose own description of what they do matches “telecommunication engineering firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names telecommunication engineering firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among telecommunication engineering firms, and records with no verified work email. Companies headquartered outside Germany are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 2,416 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Telecommunication engineering firms by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names telecommunication engineering firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many telecommunication engineering firms are there based in Germany?

RevenueBase identified 774 telecommunication engineering firms headquartered in Germany as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Axians Germany, headquartered in Ulm, tops this list with the largest team on record.

Which city has the most telecommunication engineering firms?

Berlin leads with 55 headquartered companies, followed by Hamburg (28) and Frankfurt (18).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 2,416 verified decision-maker contacts tracked across these 774 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

Ready to reach these companies? Verified emails and direct dials for all 774 telecommunication engineering firms based in Germany. Start with a free account, no credit card.

Download this list →

Related lists

Telecommunication engineering firms by geography

Browse the directory

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.