Company lists · Data refreshed September 2026

Top 25 Legacy system modernization based in Türkiye

Name: Legacy system modernization based in Türkiye
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 172 companies tracked

RevenueBase identified 172 legacy system modernization headquartered in Türkiye as of September 2026 and tracks 1,420 professional contacts across them, including 430 with verified work emails. Istanbul is the largest hub.

This list covers legacy system modernization headquartered in Türkiye, 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 20, 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 20, 2026 86% judged on-target in blind review

172Companies

1,420Contacts tracked

430Verified emails

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The 25 largest legacy system modernization based in Türkiye

Ranked by team size

Top 25 of 172 legacy system modernization based in Türkiye, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization: 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	PIA People In Action	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	201-500	285 contacts →
	Indirect evidence “Welcome to PiA, where we put People in Action to accelerate our client’s technology innovation cycles and help them addressing hyper-competition.” Source: RevenueBase Database · checked Sep 20, 2026
2	Sentim Bilişim Teknolojileri San. VE Tic. A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 20, 2026	51-200	137 contacts →
	Indirect evidence “Sentim Information Technologies is one of the leading companies that introduced the computer technologies in Turkey and pioneered the development and spread of the same in the…” Source: RevenueBase Database · checked Sep 20, 2026
3	Elsa Bilişim	Indirect evidence	TürkiyeHQ checked Sep 20, 2026	51-200	46 contacts →
	Indirect evidence “ELSA BİLİŞİM A.Ş.” Source: RevenueBase Database · checked Sep 20, 2026
4	Servicepark	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 20, 2026	51-200	46 contacts →
	Indirect evidence “Servicepark olarak uzun yıllardır bilişim sektöründe olan kaliteli bir ekip ile, müşterilerimize en yüksek kalitede çözüm ve danışmanlık hizmetleri sağlayarak özellikle kritik…” Source: RevenueBase Database · checked Sep 20, 2026
5	Montag Consulting	Partial evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	51-200	41 contacts →
	Partial evidence “Established in 2015, Montag Consulting is the recognized leader in solution design and implementation services for information technology systems.” Source: RevenueBase Database · checked Sep 20, 2026
6	Probim Teknoloji	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 20, 2026	11-50	27 contacts →
	Indirect evidence “Probim Teknoloji, 14 yıllık sektör deneyimi ile her ölçekteki kurum ve gereksinimler için IT çözümleri sağlamaktadır.” Source: RevenueBase Database · checked Sep 20, 2026
7	Ateon Information Technologies & Consulting Services	Indirect evidence	Umraniye, TürkiyeHQ checked Sep 20, 2026	11-50	23 contacts →
	Indirect evidence “Nev generation technology consulting.” Source: RevenueBase Database · checked Sep 20, 2026
8	Cozumtek Information Technologies	Indirect evidence	Ataşehir, TürkiyeHQ checked Sep 20, 2026	11-50	23 contacts →
	Indirect evidence “2008 yılında bilgi teknolojileri dünyasındaki yolculuğumuza KOBİ ve kurumsal firmalara entegrasyon hizmetleri sunmak amacıyla başladık.” Source: RevenueBase Database · checked Sep 20, 2026
9	Bizcom Bilgi VE İletişim Hizmetleri A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “Bizcom, bilgi teknolojileri alanında müşterilerinin ihtiyaçlarını karşılamak ve verimliliğini arttırmak amacıyla, deneyimli ve yetkin ekibi ile gerek kurulum ve devreye alma…” Source: RevenueBase Database · checked Sep 20, 2026
10	Fortech Bilişim	Indirect evidence	Üsküdar, TürkiyeHQ checked Sep 20, 2026	51-200	20 contacts →
	Indirect evidence “yılından itibaren Bilgi Teknolojileri üzerine çözümler sunmaktayız.” Source: RevenueBase Database · checked Sep 20, 2026
11	Codeliman Bilgi Teknolojileri VE Danışmanlık	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	11-50	18 contacts →
	Indirect evidence “We are a team of engineers and business professionals gathered to build an entrepreneurship aimed to think and act as an extension of our client's information technology teams.” Source: RevenueBase Database · checked Sep 20, 2026
12	Yesis Bilişim A.Ş	Indirect evidence	Ümraniye/i̇stanbul, TürkiyeHQ checked Sep 20, 2026	11-50	18 contacts →
	Indirect evidence “Yesis Bilişim A.Ş, 2008 yılından bu yana kurumsal firmalara IT danışmanlık, sistem yönetimi, siber güvenlik ve teknoloji altyapı hizmetleri sunmaktadır.” Source: RevenueBase Database · checked Sep 20, 2026
13	Tecron Technology	Indirect evidence	Maslak / İstanbul, TürkiyeHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “Tecron is an experienced, dynamic and proactive organization that helps transform information technology solutions to benefit its business partners strategically.” Source: RevenueBase Database · checked Sep 20, 2026
14	Datakey Bilişim VE Danışmanlık Hizmetleri Ltd. ŞTI	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “2012 yılında kurulan Datakey, uzman kadrosu ve müşteri memnuniyetini ön planda tutan kaliteli hizmet anlayışı ile daima daha iyisini başarmıştır.” Source: RevenueBase Database · checked Sep 20, 2026
15	Sinerjibt Bilgi Teknolojileri A.Ş	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “Kurumların esnek hale gelmesi, sektörlerine ve sektörlerindeki gelişmelere daha hızlı uyum sağlaması, başarı için kaçınılmaz bir gerçek.” Source: RevenueBase Database · checked Sep 20, 2026
16	ACRON	Indirect evidence	Atasehir, TürkiyeHQ checked Sep 20, 2026	201-500	12 contacts →
	Indirect evidence “ACRON, geleceğin bilişim teknolojilerini karşılayarak, danışmanlık servislerinde ve uygulamalarında uluslararası pazara yön vererek, daha güçlü ve global bir bilişim markası olmak…” Source: RevenueBase Database · checked Sep 20, 2026
17	Berka Bilgi Teknolojileri	Indirect evidence	Konya, TürkiyeHQ checked Sep 20, 2026	11-50	11 contacts →
	Indirect evidence “BERKA konusunda uzman personelleri ve 20 yıllık sektör deneyimi ile sayısız sistem müdahalesi ve güvenlik yapılandırmaları ile alanında başarılı bir şekilde hizmet veren…” Source: RevenueBase Database · checked Sep 20, 2026
18	Apptotech	Indirect evidence	Ümraniye, TürkiyeHQ checked Sep 20, 2026	11-50	10 contacts →
	Indirect evidence “At apptotech, we specialize in turning visionary concepts into tangible solutions.” Source: RevenueBase Database · checked Sep 20, 2026
19	Btlink Bilişim Teknolojileri	Indirect evidence	Kadikoy, TürkiyeHQ checked Sep 20, 2026	11-50	10 contacts →
	Indirect evidence “BTLink Bilişim Teknolojileri, kurumların Dijital Dönüşüm yolculuklarında ihtiyaç duyacakları danışmanlık, teknik destek ve hizmetleri sağlamak ve kurumların Bilgi Teknolojileri…” Source: RevenueBase Database · checked Sep 20, 2026
20	ATM Bilişim	Indirect evidence	Ankara, TürkiyeHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “1996 yılında Ankara ' da kurulan ve Bilgi Teknolojileri sektöründe kaliteli hizmet vermeyi ilke edinmiş ATM Bilgisayar, sistem entegrasyon çalışmalarından veri yönetimi ve…” Source: RevenueBase Database · checked Sep 20, 2026
21	ADK Teknoloji Hizmetleri A.Ş	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	11-50	9 contacts →
	Indirect evidence “Türkiye’nin yeni nesil bilişim firmalarından biri olarak, 2021 yılında kurulmuş olmamıza rağmen geniş ürün yelpazemiz ve sahibi olduğumuz bir çok partnerlik ile birlikte sayısı…” Source: RevenueBase Database · checked Sep 20, 2026
22	ITB Bi̇lgi̇ Teknoloji̇leri̇	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 20, 2026	51-200	9 contacts →
	Indirect evidence “ITBusiness Kurumsal teknoloji hizmetlerine yönelik tüm ihtiyaçların karşılanması amacı ile kurulan ITB, müşteri memnuniyetini esas almaktadır.” Source: RevenueBase Database · checked Sep 20, 2026
23	MEP Sistem Bilişim Teknolojileri	Indirect evidence	Sarıyer, TürkiyeHQ checked Sep 20, 2026	11-50	8 contacts →
	Indirect evidence “Mep Sistem, sektörde yazılım ve bilişim teknolojileri alanında yıllardır edinmiş olduğu deneyim ve tecrübelerle; ihtiyaçlarınızı anlamak, uzmanlık alanlarınıza odaklanmanıza…” Source: RevenueBase Database · checked Sep 20, 2026
24	Techfuture Bilişim	Indirect evidence	İzmir, TürkiyeHQ checked Sep 20, 2026	11-50	8 contacts →
	Indirect evidence “2023 yılında kurulan TechFuture Bilişim, sistem ve bulut çözümleri ile satış öncesi ve satış sonrası tamamen uçtan uca çözüm ve hizmet sunan, İzmir, İstanbul ve Ankara lokasyonlu…” Source: RevenueBase Database · checked Sep 20, 2026
25	Datatem Teknoloji	Indirect evidence	Beykoz, TürkiyeHQ checked Sep 20, 2026	11-50	8 contacts →
	Indirect evidence “At Datatem Technology, we deliver comprehensive IT services designed to help organizations modernize, secure, and optimize their digital environments.” Source: RevenueBase Database · checked Sep 20, 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: legacy system modernization. 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 legacy system modernization.
Partial evidence: Its own public description names part of legacy system modernization, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name legacy system modernization. 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 172 legacy system modernization based in Türkiye

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Legacy system modernization based in Türkiye at a glance

As of Sep 20, 2026

30.3%Verified-email coverage

8.3Average contacts per company

1-10Median size (employees)

34.9%Largest-city concentration · Istanbul

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured worldwide rather than for Türkiye, so it is reported there. Company counts and contact totals on this page are exact for Türkiye, over 172 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 legacy system modernization, 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 Türkiye whose own description of what they do matches “legacy system modernization”. 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 legacy system modernization), 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 legacy system modernization, and records with no verified work email. Companies headquartered outside Türkiye 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, 430 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 20, 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.

Legacy system modernization by metro

Legacy system modernization in Istanbul60

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 legacy system modernization, 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 legacy system modernization are there based in Türkiye?

RevenueBase identified 172 legacy system modernization headquartered in Türkiye 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?

PIA People In Action, headquartered in Umraniye, tops this list with the largest team on record.

Which city has the most legacy system modernization?

Istanbul leads with 60 headquartered companies, followed by Ankara (13) and Kadikoy (8).

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 430 verified decision-maker contacts tracked across these 172 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 20, 2026.

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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.