Ildikó Clara Szabo was born on 11 November 1962 in Arad, Romania. After studies in her home country and engagements there and in Italy, Raimondi won first prize in the operetta category at the 7th International Hans Gabor Belvedere Singing Competition in 1988.
Since 1991 she has been a member of the ensemble of the Vienna State Opera, where she has appeared in more than 40 roles, including Mozart's Susanna in Le nozze di Figaro, Zerlina in Don Giovanni, and Pamina in Die Zauberflöte. She appeared there as Mimi in Puccini's La bohème and Rosalinde in the operetta Die Fledermaus by Johann Strauss. She appeared as Micaela in Bizet's Carmen also at the Bregenz Festival, as Marzelline in Beethoven's Fidelio at the 1996 Edinburgh Festival Fringe, conducted by Charles Mackerras, and at the Salzburg Festival, performing works by Mozart and Egon Wellesz. Raimondi appeared as a guest at the Deutsche Oper Berlin, the Semperoper in Dresden, the Bavarian State Opera in Munich, the Zürich Opera House, and the Bolshoi Theatre In Moscow. She sang the part of Marzelline in Fidelio, conducted by Zubin Mehta, in the opening season of the Palau de les Arts Reina Sofia, the new opera house of Valencia.
Raimondi has performed in concerts, on radio and television in many European countries, in Japan, Indonesia, the U.S. and Israel. She has sung sacred music, for example in the Schubertiade of the Vienna Musikverein, and in Bach's and Haydn's oratorios. She performed Mozart works at the Wiener Klangbogen and at the Wiener Festwochen. She has interpreted music of the 20th century, including works by Franz Schmidt, Arnold Schoenberg, Alexander von Zemlinsky, Egon Wellesz, Ernst Krenek, Gottfried von Einem, Paul Hindemith, Friedrich Cerha and Thomas Daniel Schlee. In 2003, Raimondi issued a collection of 41 songs by the Czech composer Václav Tomášek on texts by Johann Wolfgang von Goethe. In 2011 she recorded the new gender-neutral text versions of the Austrian national anthem.
Raimondi has been professor of voice at the Mozarteum University Salzburg in Salzburg since October 2015.