Tahir Celebi is a Solution Architect at Ericsson in Istanbul, Turkey with over 15 years of experience in software development and integration for the telecommunications industry. He holds a PhD in Computer Engineering from Bogazici University and has worked on projects involving billing, charging, CRM, and OSS/BSS systems for companies like Ericsson, Atos Origin, Koc University, and Turkcell. He is skilled in Java, C, PL/SQL and technologies like BPEL, ESB, SMPP and has authored several publications on topics like video conferencing and distributed systems.

1. Tahir Celebi
Kısıklı mah. Bestekar Şevki Bey s. No: 13/10 Uskudar, İstanbul, Turkey
Mobile:+90 0533 326 7815, Home: +90 216 328 4551
Birth: 1979, Istanbul, Turkey
tahircelebi@hotmail.com
http://tr.linkedin.com/in/tahircelebi
Military Service was completed in 2007
Career Objective
A challenging position in software integration & management for designing and implementing
E2E systems. The position should have many opportunities for an aggressive, dedicated
individual with the leadership and financial management abilities.
Education
• PhD. in Computer Engineering, Bogazici University, Faculty of Engineering, Istanbul –
Turkey. (GPA: ? Rank: ?)
• M.Sc. in Computer Engineering, July 2005, Koc University, Faculty of Engineering, Istanbul
– Turkey. (GPA: 3.47 Rank :?)
• B.Sc. in Computer Engineering, July 2002, Marmara University, Faculty of Engineering,
Istanbul – Turkey. (GPA: 3.42 Rank: 5)
Internship & Employment History
September 2011 – Present
Ericsson, Istanbul, Turkey
RMEA Software Customization Center Solution Architect
• Chief Solution Architect in the Charging & Rating & Billing Domains
o Presales Activities ($1.2M Billing Sales –Adaptations & Customizations in 2012- )
o Competence Establishment
o End-to-End Design & Delivery
o Portfolio: Ericsson BSCS iX, CBiO R2 products and Other BSS Solutions (e.g.
Dealer Commissioning, ERP Integrations etc)
October 2004 – September 2011
Atos Origin, Istanbul, Turkey
Senior Consultant/Team Lead
• Telecom Consultant / Integrator (2004-2005)
• SW Developer / Development Team Lead / Solution Architect (2005-2011)
• Support Line Manager (2010)
• Market Grade Solutions: Billing (Oracle Portal -BRM-, BSCS iX) , CRM (Siebel), GPRS/EDGE
(Tango iAX™ Charge), Middleware (Oracle/TIBCO BPM/ESB)
• Custom Solutions: Billing/CRM (Vodafone TR, CCB-CRM), SDP (Vodafone TR, SDF),
SMSC/MMSC (Vodafone TR, Azercell, KCell & Geocell, SMPP GW)
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2. September 2002 – June 2004
Koc University, Istanbul, Turkey
Research/Teaching Assistant
• Research Assistant at Networked and Distributed Systems Laboratory (NDSL)
• Teaching Assistant at Computer Engineering Department of Koc University
o Principles of Programming Languages
o C/C++ Programming Language
• M.Sc. Thesis on “Multi-point Video Conference over IP Networks”.
Sample Projects and Researches
Telecom Senior Architect (Billing & Charging) (2011-Present)
• Implement & Maintain Billing & Charging Non-Kernel Developments (Watania Kuwait, Zain
Sudan, Vodafone Egypt & AveA TR)
o Integration Layer (IL) Module (Replacement for LHS CIL)
o CMS Add-ons
o Time-To-Market (TTM) Module (Replacement for PX)
o Charging Adapters (CS Web services)
o Event Handler Plug-ins
Telecom Senior Architect (BSS/OSS) (2011)
• Analyze & Document Legacy Systems/Solutions (Vodafone TR)
o Output: Product Descriptions & Development Guides
o CCB/CRM
o CDR Collection
o Provisioning Framework
o Promotion System
o Interconnect
o Dunning
Telecom Senior Consultant (SDP) (2010)
• Analyze & Design & Implement Compatible Telco Services/Solutions (Vodafone TR)
o Framework : (Equinox) OSGi
o SMS/MMS
o Location Based Services
o One Time Password
o CDR Aggregation
Establishment & Management of a Support Group (2010)
• Manage & Maintain Support Issues for AtoS’ Services/Products (Vodafone TR)
o A Team of 10 people
o 1st & 2nd Line Support
o ETOP-UP, Dunning, SMPP GW, ACMS, Callidus
Telecom Architect & Senior Developer (BSS/OSS) (2008-2009)
• Design & Implement SMPP & MMS Gateways Integrated with Siebel & ACMS (Vodafone
TR, AzerCell, KCell and GeoCell)
• Implement Automated Campaign Management System (Vodafone TR)
Telecom Integrator & Senior Developer (BSS/OSS) (2007)
• Oracle Portal Rating & Billing Module (BRM), BEPPI Billing Project (Swisscom)
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3. • Design & Implement & Integrate Custom Invoicing Solution in BEPPI Project
o Itemized Billing
• Design & Develop Billing Non-Kernel Developments in BEPPI Project
o Free Unit & Promotion Usages & Aggregations
• Development Lead in a Team of 8 people
Telecom Integrator & Software Developer (BSS/OSS) (2005-2006)
• Remote Event Notification Engine (Turkcell)
o High Performance Interface Between Content Providers and the Operators for the
Sake of Revenue Sharing
• Provisioning Interface for VAS Services (Turkcell)
o High Performance Interface Between Service Providers and the Operators for the
Sake of Revenue Sharing and Service Availability
• Real-time Data Charging of Prepaid Customers (Turkcell)
o Analyze & Integrate & Maintain a Market Grade Solution Tango iAX™ Charge
Research Assistant (2002-2004)
• Design & Implement a Novel P2P Architecture for Multi-point Video Conferencing over IP
Networks (M.Sc. Thesis, Koc University)
• Design & Implement a Technique to Improve Data Locality in Compiler Technologies
(B.Sc. Thesis, Marmara University)
o Genetic Algorithms
Academic Publications
• Celebi, T., Civanlar, M.R. and Ozkasap, O., "Peer-to-Peer Multipoint Videoconferencing on
the Internet", Signal Processing: Image Communication Journal, Elsevier Science, 20/8,
743-754, (2005).
• Celebi, T., “Design and Implementation of a Novel Peer-to-Peer Approach to Multipoint
VideoConferencing”, M.S. thesis, KOC University, Sariyer, Istanbul, Turkey, 2005
• Celebi, T., Civanlar, M.R. and Ozkasap, O., “P2P Multi-Point Videoconferencing on the
Internet”, IASTED PDCN 2005, International Conference on Parallel and Distributed
Computing and Networks, Innsbruck, Austria, February 2005.
• Celebi, T., Civanlar, M.R., Ozkasap, O., Peer-to-Peer Multipoint Videoconferencing, ICIP04,
IEEE International Conference on Image Processing, Singapore, October 2004.
Training & Course History
January/July 2012
Ericsson, Istanbul, Turkey
BSCS iX R3 Courses
• BSCS iX R3, Integrator’s Course
• BSCS iX R3, SOI Framework
• BSCS iX R3, Rating & Billing
November 2011 / March 2012
Ericsson, Istanbul, Turkey
Service Delivery (SD) Campus
• Ericsson Service Delivery Methodology
• Dale Carnegie, Leader Ship Methodology
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4. March 2008/Jan 2010, Feb 2010, May 2008, April 2010
Oracle, Istanbul, Turkey
CRM & Middleware Courses
• Oracle 10g/11g BPEL Process Manager & ESB
• TIBCO BPM & ESB technologies
• Core Siebel 8.0 Consultancy
• Oracle Golden Gate product
September 2006/April 2010
AtoS, Istanbul, Turkey
Billing & Project Management
• Oracle Portal Trainee on Tariff Planning, Non-Kernel Development & Management
• Preparation for PMP Examination, Istanbul Kurumsal Gelisim
Awards and Certificates
• B.Sc. Degree (1998-2002), ranked 5th from Marmara University.
• LES Exam (2002, Spring), ranked 85th among 150.000 rivals.
• University Fellowship (2002-2005) for M.Sc. Studies at Koc University, Istanbul.
• Oracle Portal 7 System Administrator Certificate, Oracle Portal 7 Server Developer
Certificate.
• Oracle BPEL/ESB 10g/11g Trainee, Oracle Siebel CRM 8.0 Trainee in March-May 2008 and
Jan 2010, Oracle Golden Gate Trainee in April 2010.
Skills
• Reading, writing and speaking in English fluently.
• Extensive knowledge/experience in system integration & software development in
Telecoms.
• Rating & Billing experience (Oracle Portal & BSCS) in Telecoms.
• Designing high performance distributed/parallel systems in Telecoms.
• Experienced knowledge on SMPP, MM7, SS7, GTP like protocols.
• Multimedia data transfer (RTP, RTCP, SIP, and RTSP) over IP networks.
• Hands-on development using Java (9 years, JDK-JEE), C (11 years), PL/SQL (6 years).
• APIs like: RMI, JINI, JXTA, CORBA, Servlet/JSP, JDBC, JPA, JMS, EJB, JDOM/JAXP, SOAP,
JUnit, Logica SMPP, Berkeley ViC etc.
• Given courses on the topics of OO Design Principles and Patterns.
• Usage/management of SW versioning tools like SVN, CVS etc.
• Usage/management of SW defect/change management tools like Mantis etc.
• Practice on graphics programming using OpenGL, Java3D and OpenInventor.
• Parallel Computing/Software Analysis Tools and Languages (MPI, BSP, OpenMP, SMV,
TLA+/TLC).
Hobbies
• Playing basketball (professionally during college years) and football.
• Swimming and snowboarding.
• Professional Member of Association for Computing Machinery.
• Collecting books/movies on several issues/topics.
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