Company lists · Data refreshed September 2026

Top 25 Legacy system modernization consultancies based in Türkiye

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 140 companies tracked

RevenueBase identified 140 legacy system modernization consultancies headquartered in Türkiye as of September 2026 and tracks 991 professional contacts across them, including 316 with verified work emails. Istanbul is the largest hub.

This list covers legacy system modernization consultancies 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 28, 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 28, 2026 86% judged on-target in blind review

140Companies

991Contacts tracked

316Verified emails

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The 25 largest legacy system modernization consultancies based in Türkiye

Ranked by team size

Top 25 of 140 legacy system modernization consultancies based in Türkiye, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to legacy system modernization consultancies: 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 28, 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 28, 2026
2	Indisol Bilişim VE Teknoloji	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	51-200	59 contacts →
	Indirect evidence “Indisol, teknoloji ve dijital dönüşümü odağına alıp yeni ve daha büyük başarılara imza atmak üzere OYAK bünyesinde öncelikle OYAK Grup Şirketlerine hizmet etmek amacıyla 2023…” Source: RevenueBase Database · checked Sep 28, 2026
3	Elsa Bilişim	Indirect evidence	TürkiyeHQ checked Sep 28, 2026	51-200	46 contacts →
	Indirect evidence “ELSA BİLİŞİM A.Ş.” Source: RevenueBase Database · checked Sep 28, 2026
4	Ateon Information Technologies & Consulting Services	Indirect evidence	Umraniye, TürkiyeHQ checked Sep 28, 2026	11-50	23 contacts →
	Indirect evidence “Nev generation technology consulting.” Source: RevenueBase Database · checked Sep 28, 2026
5	Bizcom Bilgi VE İletişim Hizmetleri A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 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 28, 2026
6	Codeliman Bilgi Teknolojileri VE Danışmanlık	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 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 28, 2026
7	Sinerjibt Bilgi Teknolojileri A.Ş	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 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 28, 2026
8	Elsify Software INC	Partial evidence	Kadikoy, TürkiyeHQ checked Sep 28, 2026	11-50	13 contacts →
	Partial evidence “Elsify was established to provide Consultancy, System Integration, Project Management, Business Analysis, Testing and Product Development services to Turkey's leading institutions.” Source: RevenueBase Database · checked Sep 28, 2026
9	ACRON	Indirect evidence	Atasehir, TürkiyeHQ checked Sep 28, 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 28, 2026
10	Apptotech	Indirect evidence	Ümraniye, TürkiyeHQ checked Sep 28, 2026	11-50	10 contacts →
	Indirect evidence “At apptotech, we specialize in turning visionary concepts into tangible solutions.” Source: RevenueBase Database · checked Sep 28, 2026
11	WRM Danışmanlık Yazılım VE Bilgi Teknolojileri A.Ş	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	11-50	9 contacts →
	Indirect evidence “İşletmenizin ne tür bir desteğe ihtiyacı var?” Source: RevenueBase Database · checked Sep 28, 2026
12	Datatem Teknoloji	Indirect evidence	Beykoz, TürkiyeHQ checked Sep 28, 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 28, 2026
13	Globekom	Partial evidence	Kagithane, TürkiyeHQ checked Sep 28, 2026	11-50	7 contacts →
	Partial evidence “Globekom is a company that helps businesses operating in information technology consultancy and cloud systems.” Source: RevenueBase Database · checked Sep 28, 2026
14	Zenigma	Indirect evidence	Ataşehir, TürkiyeHQ checked Sep 28, 2026	1-10	6 contacts →
	Indirect evidence “We are a new generation technology company aimed at making a difference with its technological infrastructure and providing value-added solutions in the transformations of our…” Source: RevenueBase Database · checked Sep 28, 2026
15	VOO IT Solutions	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	11-50	6 contacts →
	Indirect evidence “Voo IT Solutions, işletmelerin bilişim ihtiyaçlarının, güncel teknolojiyi kullanarak karşılanmasını sağlamak üzere 2011 yılında Nuevo adı altında kurulmuştur.” Source: RevenueBase Database · checked Sep 28, 2026
16	Resinasoft Information Technologies	Indirect evidence	Atasehir, TürkiyeHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “Your Trusted Partner in IT & Software Solutions ResinaSoft is a technology consultancy company providing end-to-end IT, software and infrastructure solutions for startups and…” Source: RevenueBase Database · checked Sep 28, 2026
17	Percom	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	11-50	5 contacts →
	Indirect evidence “Gelişen ve büyüyen bir ekonomi içerisinde rekabet anlamında önde olabilmek mutlaka her işletmenin öncelikli hedefidir.” Source: RevenueBase Database · checked Sep 28, 2026
18	Appviser	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “AppViser PS, sektör bağımsız çalışır.” Source: RevenueBase Database · checked Sep 28, 2026
19	Kobi̇ Bilgi Teknolojileri	Indirect evidence	İstanbul, TürkiyeHQ checked Sep 28, 2026	1-10	5 contacts →
	Indirect evidence “İşiniz her açıdan yeni beklentiler, rakipler, kanallar, tehditler ve fırsatlarla karşı karşıya.” Source: RevenueBase Database · checked Sep 28, 2026
20	Rubik Software	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Build Possibilities” Source: RevenueBase Database · checked Sep 28, 2026
21	Metsis Bilişim	Indirect evidence	Çankaya, TürkiyeHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Hakkımızda Metsis Bilişim genç ve dinamik kadrosu ile Bilişim / IT sektörüne, farklı anlayış ve düşünce tarzı ile katılmış bir kuruluştur.” Source: RevenueBase Database · checked Sep 28, 2026
22	Digid Yönetim VE Bilişim Sistemleri A.Ş	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	51-200	4 contacts →
	Indirect evidence “Müzik değiştiğinde dans da değişir." Kendi konfor alanınızın dışına çıkmaya ne kadar hazırsınız?” Source: RevenueBase Database · checked Sep 28, 2026
23	Proadvice	Indirect evidence	Ankara, TürkiyeHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “Proadvice BT (Bilgi Teknolojileri) danışmanlığı, işletmelere bilgi teknolojileri alanında stratejik rehberlik sağlıyoruz.” Source: RevenueBase Database · checked Sep 28, 2026
24	Smyrnatek	Indirect evidence	Kemalpaşa, TürkiyeHQ checked Sep 28, 2026	11-50	3 contacts →
	Indirect evidence “Consulting Services Our team of subject matter experts can help.” Source: RevenueBase Database · checked Sep 28, 2026
25	Vipera Bilişim	Indirect evidence	Istanbul, TürkiyeHQ checked Sep 28, 2026	1-10	3 contacts →
	Indirect evidence “İşletmeniz İçin Yönetilebilir BT Danışmanlık Hizmetleri.” Source: RevenueBase Database · checked Sep 28, 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 consultancies. 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 consultancies.
Partial evidence: Its own public description names part of legacy system modernization consultancies, 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 consultancies. 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 140 legacy system modernization consultancies based in Türkiye

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Legacy system modernization consultancies based in Türkiye at a glance

As of Sep 28, 2026

31.9%Verified-email coverage

7.1Average contacts per company

1-10Median size (employees)

35.0%Largest-city concentration · Istanbul

Sep 28, 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 140 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 consultancies, 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 consultancies”. 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 consultancies), 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 consultancies, 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, 316 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 28, 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 consultancies by metro

Legacy system modernization consultancies in Istanbul49

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 consultancies, 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 consultancies are there based in Türkiye?

RevenueBase identified 140 legacy system modernization consultancies 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 consultancies?

Istanbul leads with 49 headquartered companies, followed by Ankara (11) and Atasehir (9).

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 316 verified decision-maker contacts tracked across these 140 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 28, 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.