After winning the ARD competition, he signed a contract with the Oper Frankfurt, where in the years 1991-1994 he appeared as Escamilio in G. Bizet's Carmen, Figaro in G. Rossini's Il barbiere di Siviglia, Demetrius in B. Britten's A Midsummer Night's Dream and in the title part in P. Tchaikovsky's Eugene Onegin.

He appeared as, among others: Tonio, Alfio in P. Mascagni's Cavalleria rusticana, Enrico in G. Donizetti's Lucia di Lammermoor, Count Danilo in F. Lehár's Die lustige Witwe and in W. A. Mozart's operas - the title part in Don Giovanni as well as Count Almaviva and Figaro in Le nozze di Figaro.

[11] The following season 2000/2001 he was invited to Milan to celebrate the centenary of G. Verdi's death, during which he appeared as Count Luna in the new production of Il trovatore under the baton of Riccardo Muti.

Then in Florence, also with Zubin Mehta, he sang such roles as Attilla, Scarpia, Macbeth - in the latter he also appeared at the Glyndebourne Festival (2007, 2011) and at the Royal Albert Hall with the London Philharmonic Orchestra under Daniel Barenboim (2007).

In the 2007/2008 season Andrzej Dobber made his debut as Amonasro in Aida at the New York Metropolitan Opera[12] and at the Avery Fisher Hall during Richard-Tucker-Gala (among others with Renee Fleming and Maria Gulegina).

[15][16] The most important parts performed by Andrzej Dobber include the title role in G. Verdi's Rigoletto, which he has sung in theaters in Dresden, Leipzig, Berlin, Munich, Hamburg, Düsseldorf, Paris, Valencia, Geneva, Zurich, Cincinnati, as well as in Warsaw, Kraków, Wrocław and Poznań and the 200th anniversary of regaining independence of the Republic of Chile in 2010 in the presence of President Sebastian Piñera.

[17] Another important role is the title part in Simon Boccanegra by G. Verdi which the artist presented for the first time in 1997 at the Polish National Opera,[18] then at the Théâtre du Capitole de Toulouse under the direction of Marco Armiliato, in the years 2009–2011 at the Wiener Staatsoper and in 2010 at the La Scala in Milan and at the Staatsoper Unter den Linden in Berlin under the baton of Daniel Barenboim.

He has sung it at the Teatro Comunale in Florence (2005), the Houston Grand Opera (2015), the Wiener Staatsoper (2018) and on many German stages, including theatres in Berlin and Dresden.

[27] Andrzej Dobber's repertoire includes major Verdi parts, such as Nabucco, Falstaff, Rigoletto, Iago, Giorgio Germont, Count Luna, Marquis de Posa, Renato, Amonasro, Miller, Francesco Foscari and Simon Boccanegra, as well as Puccini parts: Scarpia, Jack Rance, Sharpless.

[32] He performed under the baton of many outstanding conductors, such as: Roberto Abbado, Richard Armstrong, Daniel Barenboim, Gary Bertini, Semyon Bychkov, Sylvain Cambreling, Riccardo Chailly, Colin Davis, Vladimir Fedoseyev, Valery Gergiev, Yakov Kreizberg, Vladimir Jurowski, Kazushi Ono, Lorin Maazel, Zubin Mehta, Roger Norrington, Kirill Petrenko, Helmuth Rilling, Carlo Rizzi, Giuseppe Sinopoli, Stefan Soltesz, Simone Young, Christian Thielemann, Lawrence Foster, Pinchas Steinberg and Edo de Waart.