1. 🚀 Seth Carney, the CTO of Courier, an all-in-one notification platform for developers, shares his journey from an InfoSec engineer to a CTO in this episode.

2. 📈 The discussion covers the evolution of Courier, which now processes billions of events each month, showing the power of scaling.

3. ☁️ Seth talks about how Amazon Web Services (AWS) has been instrumental in accommodating their infrastructure needs and the challenges they faced along the way.

4. 🛠️ Insights are provided on the role of tracing and observability tools at Courier, how they manage a vast set of metrics and logs, and their approach to latency issues and changes.

5. 💼 The second half of the conversation revolves around the balance between generating valuable events, traces, logs, and metrics and those that are just costing money.

6. 💡 Seth's mindset on building and scaling systems has changed over the years, and he emphasizes the importance of partnerships and transparency in Courier's business model.

7. 📊 Data plays a crucial role in decision-making at Courier. They use data to inform their decisions and provide observability for their customers.

8. 🌍 The episode also touches upon Courier's plans for global expansion and the engineering challenges that come with higher service level agreements.

9. 🚧 Seth discusses the importance of overcoming hurdles and unlocking value during scaling, using various strategies to achieve success.

10. 👥 Finally, the importance of building trust with customers through data transparency and reliable notifications is highlighted. Seth shares his belief that the best scaling and growth occur when there is a great partnership between the customer and the engineering team.

Full disclosure, Courier is a customer of Propel, the company I co-founded along with Nico Acosta and Mark Roberts.