as accountant vs as an accountant

Some examples from the web:

• Studie: I am qualified as accountant and commercial expert, currently job as employed and therefore I have been free generally every afternoon since 16:30 in then and the whole weekend Saturday and Sunday. If then there pits need I can also free other days.
• I have a diploma in accounting and, before entering the family business, I have worked as telephone salesman for a major winery in the area that is engaged in the mail-order business and as accountant in a construction company.
• During my service as Accountant General, I have never encountered any problems in the above discharge procedures.
• Furthermore, with regard to the spending of National Funds, a corresponding obligation exists in the course of my duties as Accountant General.
• Santoianni Simone, after finished his highschool studies as Accountant (I.G.E.A. project) in 1996, starts his adventure in the software world in 1998 as teacher for some of the most important accounting programs.
• He has graduated as accountant!
• During my professional career, I have been party to many important decisions (both in my capacity as Accountant General and as Chairman of decision making statutory Committees/Boards) that had a significant impact on the provision of public services in Cyprus.

Some examples from the web:

• My fourth anniversary as an accountant.
• Which is around the same time he stopped making money as an accountant.
• While employed as an accountant, I considered myself to be primarily a writer.
• While employed as an accountant, I mainly followed other people's directions.
• It was a relatively stimulating experience for me as an accountant, and I think I handled my responsibility well.
• March 23rd, 1878 J. A. Long, now described as a Miller of Calbourne, sells the mill to George Weeks, described as an accountant of Brixton Rise, London.
• During this time, he also worked as an accountant.
• And Everett worked as an accountant at the county comptroller's office.
• After leaving school, he trained as an accountant.
• But he quit a well-paying job as an accountant.
• In my youth, I have worked as an accountant of a small fief in the north-east.
• I used to work for the Secret Services... as an accountant.
• Instead of landing on the peninsula with the battery, Brownell was transferred to Alexandria where the Army required his administrative abilities as an accountant.
• The first Tiger samples would take more than a year to be shipped to Knight; During that time he found a job as an accountant in Portland.
• After graduating from the University of the Philippines, he worked as an accountant and financial analyst, then launched a highly successful business in real estate.
• Then I dropped out of an MBA program and went to work immediately as an accountant in Minnesota.
• When I became employed as an accountant, I began in middling positions and and remained so.
• While still a teenager Hanna returns to South Tyrol, lives again with Aunt Lora Kurtatsch and works as an accountant for a wine distributor.
• After graduation, Sweeney moved to Los Angeles where she worked as an accountant for Columbia Pictures and United Artists.
• Apart from his restauranteur business, Stefan has also worked as an accountant for political party finances.