In May 2026, Uber suffered a cascading failure that took down ride-hailing and Uber Eats for over an hour across three continents. Lucas and Luna dissect what went wrong — and more importantly, how the engineering team rebuilt the control plane that caused the meltdown. They walk through the specific architectural change: replacing a monolithic 'super-router' service with a delegated authority model inspired by airline air-traffic control. The episode explains why Uber's old mesh of 2,200 microservices still had a single point of failure, how capacity handshake protocols now prevent the same pattern, and what any CTO can learn from Uber's decision to publish the postmortem in full. No fluff, no hype — just a sharp engineering case study about distributed systems, incident response, and organizational humility.

#Uber #Microservices #CascadingFailure #Postmortem #DistributedSystems #EngineeringLeadership #CTOPodcast #FexingoBusiness #BusinessPodcast #Architecture #IncidentResponse #Resilience #ServiceMesh #CapacityPlanning #AirTrafficControl #SuperRouter #SystemDesign #TechLeadership

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In this episode of The CTO Podcast with Fexingo, Lucas and Luna explore how Figma built a real-time multiplayer editing system that coexisted inside Google Docs' iframe sandbox — a technical feat that required creative iframe communication, custom CRDT sync, and a deep understanding of browser cross-origin restrictions. They break down the architecture Figma used to render pixel-perfect UI inside a Docs sidebar, how they handled latency and conflict resolution, and why the integration was eventually deprecated. Lucas walks through the trade-offs Figma's engineering team made: ditching WebSocket fallbacks, using postMessage with a handshake protocol, and aligning CRDT timestamps across two separate application clocks. Luna challenges him on whether the technical elegance was worth the maintenance cost. This episode is for anyone who has ever tried to build a complex web feature inside someone else's DOM and wondered why it's so hard. Contains a brief donation segment for listener support.

#Figma #GoogleDocs #CRDT #RealTimeCollaboration #IframeSandbox #WebDevelopment #CrossOrigin #PostMessage #BrowserArchitecture #ProductIntegration #CTO #EngineeringLeadership #TechnicalArchitecture #BusinessAndTechnology #FexingoBusiness #BusinessPodcast #TechStrategy #WebPerformance

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In this episode, Lucas and Luna unpack a specific engineering challenge that Etsy tackled in 2025: migrating 200 microservices to a cheaper Kubernetes node pool while maintaining their deploy-every-second cadence. They walk through the technical decisions — bin-packing algorithms, traffic-shaping, and canary analysis — and explain why the project saved $4.2 million annually without a single production incident. A masterclass in cost optimization that doesn't sacrifice velocity.

#Etsy #Microservices #Kubernetes #CostOptimization #SiteReliabilityEngineering #SRE #EngineeringLeadership #TechnicalDebt #CloudInfrastructure #FinOps #DeployVelocity #CanaryDeployments #BusinessAndTechnology #FexingoBusiness #BusinessPodcast #CTOPodcast #EngineeringOrg #Architecture

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In this episode of The CTO Podcast, Lucas and Luna explore why Netflix, after years of relying on Amazon Web Services and third-party CDNs, decided to build its own content delivery network, Open Connect. They break down the math behind the decision: the $1 billion annual bandwidth cost savings, the shift from paying for egress to owning last-mile infrastructure, and the architectural trade-offs that come with running 17,000 purpose-built appliances in internet exchange points worldwide. Listen in for a detailed look at how Netflix turned a cost center into a strategic moat, and what it means for any engineering org facing the build-versus-buy question at scale.

#Netflix #OpenConnect #CDN #ContentDelivery #EngineeringOrg #BuildVsBuy #CloudEconomics #Bandwidth #EdgeComputing #Streaming #Infrastructure #CostOptimization #TechnicalLeadership #CTO #Architecture #BusinessAndTechnology #FexingoBusiness #BusinessPodcast

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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 Stripe chose Rust over Go, how they used feature flags to roll out changes incrementally, and the engineering org structure that made it possible. A concrete case study in high-stakes infrastructure migration for CTOs and senior engineers.

#Stripe #Rust #RustLang #Payments #EventDriven #Microservices #Migration #CTO #EngineeringOrg #TechnicalLeadership #SystemArchitecture #FeatureFlags #RubyOnRails #Infrastructure #TechPodcast #BusinessAndTechnology #FexingoBusiness #BusinessPodcast

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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-sourcing model built on Apache Kafka and CockroachDB, the trade-offs of dropping ACID compliance for transactional speed, and how the engineering team handled the risk of a years-long migration without freezing product development. The episode uses Monzo's 2023-2025 re-platforming as a concrete case study in when to rewrite versus refactor, and what it takes to maintain customer trust during a core system change. Along the way, they touch on how Monzo's CTO Sujata Bhatia structured the migration into six-week phases, the unexpected operational cost of running two systems in parallel, and what other fintech CTOs can learn from Monzo's decision to build rather than buy a core banking ledger.

#Monzo #CoreBanking #EventSourcing #ApacheKafka #CockroachDB #FintechArchitecture #SystemRewrite #CTO #EngineeringLeadership #TransactionProcessing #ACIDvsBASE #MigrationStrategy #SujataBhatia #Business #Technology #FexingoBusiness #BusinessPodcast #TheCTOPodcast

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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 wondered whether Spotify's engineering culture is still the gold standard, or whether it's become a cautionary tale, this conversation gives you the specific trade-offs—backed by public statements from Spotify's own CTO and engineering directors.

#Spotify #SquadModel #EngineeringOrg #TechLeadership #Scalability #Agile #Guilds #Autonomy #Alignment #CTO #BusinessAndTechnology #FexingoBusiness #BusinessPodcast #TheCTOPodcast #Architecture #OrgDesign #ProductTeams #PlatformTeams

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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 lens: not abstract theory but real trade-offs, real numbers, and the human cost of technical debt. Lucas explains why the original monolith made sense at launch, how the team misjudged database partitioning, and what the eventual move to event sourcing taught them about scaling trust between engineering and product. Luna presses on whether the rewrite was avoidable and what the incident reveals about Silicon Valley's cult of move fast. The result is a tight, concrete look at how technical leadership is not about choosing the perfect architecture but about knowing which problems you're willing to live with.

#DoorDash #Architecture #EventSourcing #MonolithToMicroservices #EngineeringLeadership #TechnicalDebt #Scalability #CTO #DispatchSystem #AsyncSystems #DatabasePartitioning #StartupTech #MoveFast #SystemDesign #OperationalExcellence #BusinessAndTechnology #FexingoBusiness #BusinessPodcast

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