| 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
|
| 1998-2000 | Eko construction consults Ltd.
Building Management and Site Management of varied private houses, block of Flats, Berlin und Brandenburg
|
| 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,
|
| 2008 | BV. Hotel / hostel, window renewal measures including project management at Boxhagenerstr. 26, 10245 Berlin |
| 2009-2011 | Active in various German-Libyan and Turkish-Libyan project consulting and project development in Libya |
| 2010-2012 | Active in various German-Moroccan and Turkish-Moroccan project consulting and project development in Morocco. |
| Since 2013 | Active in various German-Angolan and Turkish-Angolan project consulting and project development in Angola. |
| Since 2017 | Active for European -Turkish Hobbits Recover and Holiday Village project. Project consulting and project development in the southeastern Mediterranean between Gazipasa and Anamur Turkey. Construction of the first model hobbits based on eco and health tourism. |
| 2018 | Other outdoor facilities such as sidewalks and terraces. Surface Drainage And Rainwater Civil Engineering Work In |
| 2019 | Some outdoor facilities such as sidewalks and terraces and various renovation work in Berlin/Brandenburg |
| 2020/2021 | Reconstruction and expansion and various renovation work in Berlin/Brandenburg |
| 2021 | Renovation work, conversion and expansion for various objects as well as some outdoor facilities in Berlin/Brandenburg |
