| 1979-1981 | DÖRING Architecture office Design of private Houses and Block of flats incl. Project control, Dortmund |
| 1986-1992 | TILL Architecture office Design of private Houses and Block of flats as well as Sports buildings and commercial buildings incl. Project control, Berlin
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| 1994-1998 | Bona construction Ltd.
Building Management and Site Management of varied private houses, block of Flats, residential area development, partial shell of building, extension as well as road construction, settlement of private houses, turnkey incl. infrastructure, Berlin and Brandenburg
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| 1998-2000 | Eko construction consults Ltd.
Building Management and Site Management of varied private houses, block of Flats, Berlin und Brandenburg
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| 1998-2007 | Environmental consulting services for the municipality Ardesen-Rize, Türkiye |
| 1998-2008 | Environmental consulting services for the administrative district (governorship) Artvin, Türkiye |
| 1999-2003 | LOPP engineers office
Management consultancy services for the infrastructural project development (Drink water plant, waste water treatment plant, hydro energy plant), Weimer |
| 2003-2004 |
Schüßler-Plan consulting engineers Ltd.
Management consultancy services for the Bridges Khartoum North-Tuti and Abu-Haraz in Khartoum-Sudan, Ankara, Berlin |
| 2004-2006 | Environmental consulting services for the Association of waste management and waste water treatment- ARRIKAB (14 municipalities from Rize and Artvin) Artvin, Ankara und Potsdam |
| 2003-2008 | ÖZSEN Architektur Ltd.
Management consultancy services for the Bridges Khartoum North-Tuti and Abu-Haraz in Khartoum-Sudan, Ankara, Berlin |
| 2007-2009 | EL NASR ÖZSEN ESTATES Co. Ltd.
Management consultancy services for the JOINT COMMAND Building in Khartoum-Sudan, Ankara, Berlin,
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| 2008 | BV. Hotel/Hostel, Fenstererneuerungsmaßnahmen einschl. Projektsteuerung an der Boxhagenerstr. 26, 10245 Berlin |
| 2009 - 2011 | (bis Sturz von Kaddafi) Tätig im diversen Deutsch Lybischen und Türkisch-Lybische Projektberatung und Projektentwicklung in Libyen |
| 2010 - 2012 | Tätig in diversen Deutsch- Marokkanischen und Türkisch-Marokkanischen Projektberatung und Projektentwicklung in Marokko |
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| Seit 2013 | Tätig in diversen Deutsch- Angolanischen und Türkisch-Angolanischen Projektberatung und Projektentwicklung in Angola |
