In May, Test in Production Meetup was held in Paris, hosted by Algolia. Xavier Grand, a Senior Engineer at Algolia, discussed how his team tests when they have 4500 customers across 16 regions and handle 14 billion queries per month. He emphasized the importance of testing in production without compromising availability. The talk covered why teams should test in production, how to do it properly, and specific practices at Algolia. Xavier highlighted that software design and infrastructure are crucial for successful testing in production. He also discussed progressive deployment strategies and monitoring tools used by his team.