[1] He began working at what would later become Paradox Interactive in 1998, joining the original team that had been developing Europa Universalis.

[2][3] Although he began his career as a programmer, Andersson later became a designer and producer at Paradox Development Studio, working on grand strategy games such as Hearts of Iron III, Crusader Kings II, Victoria II, Europa Universalis IV, Stellaris, and Imperator: Rome.

[4] Andersson's design philosophy is "to create believable worlds.

"[5] In June 2020, he became the lead of Paradox Tinto, a newly established studio based in Barcelona.

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