Melih Geçek
General Manager
Born in 1981 in Istanbul, Melih GEÇEK graduated from Marmara University Faculty of Technical Education, Department of Teaching Electronics and Communication in English in 2003. In 2022, he graduated from the Anadolu University Department of Management Information Systems. In 2023, he completed his Master’s Degree in Business Management at Nişantaşı University.
Between 2001 and 2009, he provided IT Consultancy Services to many companies. In addition to his career in the private sector, he worked as a consultant and project manager in Digital Transformation and Smart City Projects supported by the European Union, World Bank, and Asian Development Bank in 60 public institutions in 12 different countries.
In 2009, he founded a company whose field of activity is IT Consultancy. He partnered with many technology companies, trained companies in the field of cloud technologies, and introduced more than 500 companies to Cloud technologies.
In 2019, he assumed the positions of Istanbul Metropolitan Municipality (IBB) Presidential Advisor and IBB Technology Coordinator.
He took part in the establishment and management of the IBB Technology Desk, which is a common mind platform where Istanbul Metropolitan Municipality (IBB), Istanbul Water and Sewerage Administration (ISKI), Istanbul Electric Tram and Tunnel Administration (IETT) and their subsidiaries share and develop their technology projects.
In October 2024, he was appointed General Manager of ISTTELKOM AŞ.
He has 1 child and speaks English fluently.
Taner Citak
Information Technologies Deputy Manager
He was born in Istanbul in 1976. Having graduated from Yeşilköy 50. Yıl High School, he received his bachelor’s degree from Yıldız Technical University, Electrical and Electronics Engineering Department in 1997. He got his master’s degree in Business Administration (MBA) from Yeditepe University in 2004.
Starting his career as a Project Manager in an international company operating in the industrial automation sector between 1997 and 2000, Çıtak continued to work as General Manager and Board Member of group companies at ETC AŞ between 2000 and 2015, leading many important telecommunication, GSM, fiber optic infrastructure projects of the company throughout Turkey.
Between 2015-2017, he took active roles in senior management positions at Çukurova Holding, heading the unification of IT infrastructure and smart home projects.
Between 2017-2019, he served as General Manager at Telda AŞ, which operates in the fields of telecommunications and information technologies.
In November 2019, Mr. Çıtak started to work as Information Technologies Director at İSTTELKOM Inc. and was appointed as Assistant General Manager of Information Technologies in January 2023.
Taner Çıtak speaks English and is married with one daughter.
Betul Berran Ortanc
Legal Counsel
Betül Berran ORTANC graduated from the Faculty of Law of Yakın Doğu Üniversitesi [Near East University] in 2014.
Ortanc, who specialized in the fields of Private Law, Law of Commerce, Law of Obligations and judicial proceedings under the roof of well-known Law Offices between the years 2015 and 2017, managed the preparation and the follow-up stages of the contracts in accord with the needs of her local/foreign personal or corporate clients in the field of Law of Contracts.
Ortanc, who worked under the umbrella of Ericsson Telekomünikasyon AŞ (regional business partner of Turkcell İletişim Hizmetleri AŞ) in the year 2017, specialized in the field of Telecommunications Law and worked actively in the management of legal issues regarding the provision of services, all kinds of conflicts (disputes) experienced in the sectors containing technical contents; and, she actively participated in the settlement of conflicts (disputes) and judicial proceedings.
Ortanc, who started working in a Company titled İSTTELKOM Inc. in November 2019, currently manages the legal processes in the fields of Corporate Law and the Law of Commerce. In addition, she follows up on the legal processes regarding the activities within the scope of Electronic Communication Regulations and actively participates in the preparation of Partnership Contracts related to the business activities of the Company and discussions related to the relevant processes. Under the umbrella of our company, Attorney Betul Berran Ortanc also successfully manages the judicial proceedings concerning the disputes between the employees and the employers.
Ortanc has been working as a Legal Counsel in our company since 2019 and speaks English and German.
Naime IBIS GURSEL
Trade Manager
Naime Ibis Gursel was born in 1982 in Istanbul. She graduated from Marmara University and Anadolu University. In 2012, she completed her Master’s degree in Business Administration at Beykent University. Currently, she is pursuing her Ph.D. in the Business Administration Department at Dogus University.
She began her professional career in 2005 as a Customer Representative at Oyak Bank. Between 2008 and 2012, she worked as a Product Research and Development Analyst at Bank Pozitif AS. From 2014 to 2020, she served in the Procurement and Tender Department of Beylikduzu Municipality. Between 2020 and 2024, she held the position of Administrative Procurement Chief at ISBAK AS. Since December 2024, she has been appointed as the Trade Manager at ISTTELKOM AS.
Naime Ibis Gursel is married and speaks English.
Olcay Karadeniz
Information Technologies Director
Born in 1979 in Cologne, Germany, Olcay KARADENIZ graduated from Abant İzzet Baysal University Industrial Electronics Associate Degree, Anadolu University Faculty of Business Administration, Department of Business Administration and Newport International University Electronics & Communication Engineering.
Between 1996 and 1999, he worked as a design and graphic designer at Turmak AŞ, and between 1999 and 2000 he worked as an IT System Specialist at Maestro Software.
Between 2000 – 2001, he worked as a Supervisor at Motorola, between 2001 – 2004 as a Senior Specialist at Nom AŞ, between 2004 – 2017 as a Transmission Unit Manager at Etc AŞ, between 2017 – 2020 as a Project Manager at Huawei.
Starting to work as Chief of Information Technologies Infrastructure at İSTTELKOM Inc. in 2020, Mr. Karadeniz was appointed as Information Technologies Director in December 2024.
Olcay Karadeniz is married with one child and speaks English and German.
Serhat Yetim
Head of the Sales and Marketing Department
Born in 1983 in Tunceli, Serhat Yetim graduated from Kocaeli University, Department of Electrical Engineering in 2006. In 2009, he completed his MBA at Maltepe University and in 2011 he completed his master’s degree in Electrical and Electronics Engineering at Munzur University. He was awarded various Certificates from Koç University Corporate Sales School and similar sectoral training programs.
In 2007, when he started his career at TÜRK TELEKOM AŞ and served in technical positions such as Access Engineering and Operations Manager, he assumed key roles in access, network and fiber infrastructure projects. Between 2014-2018, as Team Leader of the Sales Department, he successfully managed many public projects.
Between the years 2018 and 2024, he served as a Sales Leader at Koç Sistem and took part in projects on digital transformation and information technologies, especially in the public and financial sectors.
In August 2024, he joined İSTTELKOM AŞ as Sales and Marketing Manager and he shall lead all digital transformation projects together with the Project Management Office.
Serhat YETİM has a good command of English, is married and has one child.
Sinan Oztimur
IT Service Operations Director
Sinan Öztimur was born in 1974 in Ankara. He had his secondary education in Bornava Anatolian High School, German section in İzmir and high school education in Bursa Science School. Later, he studied Computer Programming at Boğaziçi University and Business Administration at Anadolu University. In 2017, he completed the Executive MBA program of Koç University.
Öztimur has started his professional career in 1997 as a System Engineer in Escortnet. After working in Germany for a short period, he returned to Turkey and started to work as a Network & Security Specialist at İntrakets, a system integrator company.
Afterwards, in 2002, he moved to İŞNET, which is a subsidiary of Türkiye İş Bankası where he worked as a Network and Security Director. Then, he continued his career at PROBİL
In 2007, Mr. Öztimur joined Turkcell Global Bilgi as a Network and Security Specialist. After leaving Global Bilgi in 2016 as an IT Architect, he worked as an expat in Minsk/Belarus for 1 year and worked as a technical Director in many projects as well as Ukrainian operations.
During 2016 and 2019, Öztimur worked as the IT Director of DRD Fleet Leasing. Afterwards, he started at İBB (Istanbul Metropolitan Municipality) subsidiary KİPTAŞ as Information Technologies Director in 2020.
In 2022, Mr. Öztimur started working as SOC Project Manager at İSTTELKOM Inc. and continues to work as IT Service Operations Director.
Sinan ÖZTİMUR is married, has one daughter and speaks English and German.
Zeynep Calman
Human Resources Manager
Zeynep CALMAN completed her undergraduate and graduate studies in Business Administration.
She started her career as a Human Resources Specialist in METRO Cash & Carry in 2002-2006. She worked as the Human Resources Manager of DOGAN Health Group between 2006-2010 as a consultant in health sector employment, and as Project Manager in the establishment, management and organization of the Selection and Placement and Total Quality Management processes during 2010-2012, respectively.
Between 2012-2018, she carried out the functions of Establishing and Developing a Remuneration, Benefits and Human Resources Systems at BERKO pharmaceuticals. She was actively involved in SAP HR, SAP Success Factors Performance and Career Management projects and TURQUALITY Branding Program projects.
In 2018-2019, she worked as the Human Resources Manager at TICIMAX Information Technologies company.
Calman started to work as the Human Resources Project Chief in the Social Services Directorate of IBB ISPER Inc. in 2020 and was subsequently appointed Human Resources Manager of ISTTELKOM Inc. in November 2021 which continues to date.