The development of the COVID-19 vaccine has been one of the most amazing feats of human engineering and coordination under pressing time constraints. With the discovery, trials, and approvals behind us, the next step in this large-scale immunization program was to produce, procure, and distribute the billions of vaccines that would be needed for regular life to resume. Moreover, we had to do this with extreme speed. If the vaccine program was not fast, we would have been left chasing our own tail, as those vaccinated early may have lost immunity before the last person was vaccinated. A successful drive was contingent upon smooth coordination between a large number of stakeholders, requiring extreme speed from all of our health infrastructure, both private and public. With uncertainties and anxieties in full swing, conditions were also ripe for rent-seeking, black-marketing, and other ugly unfairness to prop. While no system can guarantee that there is no fraud, we still needed to install checks and balances to minimize it. The biggest check was transparency around the vaccination data. Additionally, there were various considerations to keep in mind as vaccinations would have ensued—citizens’ preferences in the type of vaccine, timing of vaccination, and place of vaccination. In parallel, vaccination centers needed flexibility and agency too, to decide how best to serve their local constituencies. In the COVID-19 vaccination scenario, extreme speed, smooth coordination, and vaccine efficiency were paramount. We needed to balance these three while also triaging fairly, providing individual agency and flexibility to vaccination centers. This was hard for any country, but an even harder challenge given our population size, with the diversity and federated structure of India.This is where Co-WIN stepped into the picture to answer the multitude of worries raised and served as the digital information management system that bridged the gaps to enable the administration over 2 billion vaccine doses in a record time.