When one deploy can lock out millions. Engineering at Bolt in Tallinn

Bolt serves more than 200 million customers in 600+ cities. Much of the code behind its rides, deliveries, and rentals is written in Tallinn, where Bolt is headquartered. At this scale, there’s no such thing as a harmless small change. A single deploy can stall a market, yet a 100 ms optimisation can save users thousands of hours a year.  This is the everyday reality for engineers like Madis Peetersoo (Engineering Manager, Delivery), Jana Lutus (Junior Software Engineer, Mobility), and Laura-Eliise Marrandi (Junior Software Engineer, Mobility).