Today's mobile product managers are collaborating more closely with developers as the app development process becomes increasingly multi-disciplinary. Effective communication and productivity are crucial skills for product managers to possess, especially when working on fast-paced release cycles involving multiple teams and features. To achieve harmonious collaboration, product managers can start by getting to know their developers, understanding their roles and workflows, and involving technical leads in project planning early on. They should also be aware that there's no instant gratification and need to stop obsessing about having everything done immediately. Communication is an iterative process that requires discussing requirements with developers, asking for feedback, and finding compromises that work for both parties. Additionally, product managers should strive to be clear and thorough in their instructions, get outcome-oriented when dealing with smaller tasks, study up on technical stuff, estimate timelines accurately, respect developers' space, and earn their trust. By following these tips, product managers can improve their working relationships with developers and ultimately build better apps that delight users.