The paper discusses a case study of a gig workers' mobilization inside a Swiss online food-delivery platform where bike couriers were successful in making their voices heard. While communication at the micro level was impeded by digital platforms, platform workers were able to put pressure on their supervisors, find support from a trade-union and organize themselves in order to engage successful negotiations at the meso level. However, if the negotiation could take place successfully, this also relied on some deep ongoing changes and debates within society about the need for regulating the platform economy. Thus, the macro level also provided essential resources for the mobilization. The main outcome of the mobilization was that gig workers were able to engage social dialogue and improve their working conditions. This suggests that, in the end, workers' voice can take place in the platform economy, overcoming the numerous forms of spatial, social, organizational, etc. fragmentation prevailing in the sector and the difficulties created by algorithmic management. Our case study illustrates the need to understand and analyze together the micro, meso and macro levels when analyzing workers' voices in the platform economy.