Fexingo
The CTO Podcast with Fexingo: Technical Leadership, Architecture, and Engineering Org
Lucas and Luna sit down in front of a whiteboard to dissect the decisions that shape technical organizations. Each episode of The CTO Podcast with Fexingo examines a specific engineering leadership challenge — from scaling a microservices architecture without creating a distributed monolith, to managing the cognitive load of a 200-engineer org, to choosing between a monorepo and polyrepo strategy based on team topology. The conversations are grounded in real-world cases: how Etsy restructured its data pipeline after a 2019 outage, why Stripe’s API versioning policy reduces breaking changes, or...
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Episodes
How Stripe Migrated Its Core Payments Stack 22.05.2026 9:40
Episode 4 of The CTO Podcast with Fexingo dives into Stripe's 2024-2025 migration of its core payments processing system from a monolithic Ruby-on-Rails architecture to a Rust-based, event-driven platform. We explore the technical tradeoffs Stripe's engineering team faced, including how they managed the migration of over 100 million API requests per day without downtime. Lucas and Luna break down...
Why Monzo Rewrote Its Core Banking Engine 21.05.2026 11:28
Episode 3 of The CTO Podcast dives into how Monzo, the UK neobank, rebuilt its core transaction-processing engine after hitting performance and reliability ceilings. Lucas and Luna walk through the specific architectural problem: a relational database bottleneck that capped transaction throughput at 1,000 per second during peak hours. They explain Monzo's decision to move to a custom event-sourcin...
How Spotify Breaks Its Own Engineering Silos 21.05.2026 10:40
In this episode, Lucas and Luna examine Spotify's famous 'Squad' model—the engineering org structure that inspired a thousand startups—and why the company itself has been quietly moving away from it since 2023. They trace the tension between autonomy and alignment, the rise of 'Guilds' as a coordination layer, and what happens when a hyper-growth org outgrows its own playbook. If you've ever wonde...
How DoorDash Lost Its Lead and Got It Back 19.05.2026 8:38
In this debut episode of The CTO Podcast, Lucas and Luna unpack a single engineering decision at DoorDash that nearly broke the platform then saved it. They trace how a change from synchronous to asynchronous dispatch in 2019 cut delivery times by 12 percent but also triggered a cascade of system failures that forced a complete architecture rethink. Through this one case, they establish the show's...
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