Born in Gothenburg, Jäderblom received a Master of Law degree from the University of Uppsala in 1983. After working as a court clerk for a couple of years, she became an assistant judge at the Administrative Court of Appeal in Stockholm in 1987 and later an associate judge at the same place.
She worked for the Ministry of Justice as legal adviser in the Division of Constitutional law from 1994 and also served as deputy director there. Between 2002 and 2005 she was head of the divions that prepared decisions on pardons for convicts.
From 2005 she was senior judge at the County Administrative Court in Stockholm, from 2007 chief judge at the Administrative court of Appeal in Stockholm and in 2011 she became judge at the Supreme Administrative Court of Sweden.
In April 2012, the Swedish government nominated her as one of three candidates to replace Elisabet Fura as the Swedish judge at the European Court of Human Rights. In June the same year she was elected new judge for a nine-year period by a majority of the Parliamentary Assembly of the Council of Europe.
- Tidningarnas Telegrambyrå (27 June 2014) Sverige Jäderblom domare i Europadomstolen Göteborgsposten.
- Doc. 12936 117 Helena JÄDERBLOM CURRICULUM VITAE pp 117-119. Parliamentary Assembly of the Council of Europe. Retrieved 5 July 2014
- Press release, Ministry for Foreign Affairs (27 June 2012) Helena Jäderblom appointed judge of European Court of Human Rights Government.se.
- PACE elects Helena Jäderblom judge of the European Court of Human Rights in respect of Sweden Parliamentary Assembly. Council of Europe. Retrieved 6 July 2014
- Ronan Ó Fathaigh (4 July 2014) A Lesson for Applicants: Don’t Agree to a Relinquishment to the Grand Chamber Strasbourg Observers.