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Ossi Marttinen began their work experience as a Summer Intern at the Finnish Institute of Occupational Health - Työterveyslaitos in May 2018, where they worked until August 2018. In January 2019, Ossi started as a Software Developer Intern at the same company and continued in that role until June 2019. Following this, Ossi joined Neomore in June 2019 as a Software Developer.

Ossi Marttinen completed their Bachelor of Business Administration (BBA) degree in Computer Software Engineering from Haaga-Helia University of Applied Sciences, which they attended from 2016 to 2019. Prior to that, they attended Keravan lukio from 2012 to 2015, although their field of study during that time is not specified.