Technologies are predominantly understood as ‘solutions’ for policy problems in EU border control. This has prompted increased political attention to research and development (R&D) of ‘innovative’ security technologies. The European Commission has continuously increased its spending on the development of security devices in the Security Research Programme; at the same time, border security institutions such as Frontex or eu-LISA have worked to amplify their influence on shaping security research in the EU’s Research Framework Programmes. Against this backdrop, this article develops the argument that R&D is a political practice of ‘making’ and governing the border through its entanglement with the politics of border security in the EU. By conceptualizing R&D as ‘borderwork’, the article interrogates how practices of security R&D inscribes specific logics into EU border security and control. In doing this, it also problematizes how R&D locks in exclusionary dichotomies and categorizations of mobilities through privileging security actors in the process. Based on qualitative interviews, the article provides an in-depth analysis of political processes through which R&D programmes and projects materialize at policymaking, implementing and operational levels. Through this, the article explores comprehensively how political logics of bordering are constantly shaping and simultaneously renegotiated in R&D.