2023 – 2024: chair of the work group on the evaluation of council proceedings2022 – present: spokesperson on Finance, Art and Culture, Monuments and Heritage2021 – present: chair of D66 in the Arnhem city council2018 – 2022: spokesperson on Innovation and Economic Development, Employment (2018-2020), Housing (2020-2022), Education, Youth (2018-2021), Finance (2021-2022), Health Care and Welfare2018 – 2022: member of the work group on the evaluation of council proceedings2018 – 2022: chair of the audit committee2016 – 2018: member of the audit committee2014 – 2018: spokesperson on Urban Development, Housing, Real Estate, Events, Energy TransitionPersonal website (in Dutch): www.mattijsloor.nl.

2018 – 2020 Member of management team Factor Architecten / Feenstra Adviseurs / IA Bouwkunde2012 – 2019 Intern supervisor (BBE / MSc students)Portfolio: https://www.factorarchitecten.nl/projecten/?subcat=47#_mattijs-loor

2017 Talent Programme board member: treasurer, promotion2017 ‘Brexit gaat over historie en trots’ (Brexit is about past and pride), on cause and effect of Brexit in Cardiff and Birmingham, published in ‘Democraat, October 2017’, co-writer2017 Development of a training programme based on a three-day city council simulation2016 ‘D2066, een toekomstverkenning’ (D2066, a foresight), on D66 in 2066 from both positional, organisational and electoral point of view, co-writer and editor