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The CTO Podcast with Fexingo: Technical Leadership, Architecture, and Engineering Org

The CTO Podcast with Fexingo: Technical Leadership, Architecture, and Engineering Org

By: Fexingo
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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 what Basecamp’s choice of SQLite over PostgreSQL says about product philosophy. Lucas brings the journalistic rigor — citing commit histories, RFCs, and postmortems — while Luna pushes back with the pragmatics of org dynamics, hiring constraints, and technical debt. There are no hot takes, no vendor pitches, no ‘best practices’ without trade-offs. Each episode ends with a specific tension left unresolved: the optimal number of direct reports for a VP of Engineering, the point at which a monolith should be broken apart, or whether a platform team should own the CI/CD pipeline. The listener is a senior engineer, a staff+ IC, or a new CTO who wants to learn from the decisions others have made — without the hype. After an episode, you’ll have a framework, not a checklist, and a clear sense of the questions you should be asking your own team. #CTOPodcast #TechnicalLeadership #EngineeringOrg #SoftwareArchitecture #SystemDesign #EngineeringManagement #Microservices #Monorepo #PlatformEngineering #Scalability #TechDebt #DevOps #Infrastructure #SiteReliability #DistributedSystems #Business #FexingoBusiness #Technology Keep every episode free: buymeacoffee.com/fexingo© 2026 Fexingo. All rights reserved. Economics
Episodes
  • How Coinbase Rebuilt Its Blockchain Node Infrastructure

    How Coinbase Rebuilt Its Blockchain Node Infrastructure
    Jun 30 2026
    In this episode, Lucas and Luna dive into the architectural overhaul Coinbase undertook to scale its blockchain node infrastructure from supporting a handful of cryptocurrencies to over 200 networks. They explore the specific challenges of maintaining consensus across Ethereum, Solana, and Polygon nodes, the migration from monolithic to microservices-based node management, and how the team reduced latency by 40% while cutting infrastructure costs by 30%. Lucas breaks down the trade-offs between full nodes and light clients, the role of WebSocket-based event streaming for real-time transaction monitoring, and why the company ultimately built its own node orchestration platform rather than relying on third-party providers. Luna questions the decision to keep node operations in-house versus using infrastructure-as-a-service, and they discuss the operational burden of chain reorganizations and state snapshots. The episode also covers the impact of Ethereum's transition to proof-of-stake on node requirements and how Coinbase prepared for the merge without downtime. A must-listen for engineers and architects working on decentralized infrastructure at scale. #Coinbase #Blockchain #NodeInfrastructure #Ethereum #Solana #Polygon #ProofOfStake #Microservices #WebSocket #EventStreaming #InfrastructureAsCode #Orchestration #Scaling #Crypto #TechnicalLeadership #BusinessAndTechnology #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo
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    12 mins
  • How Shopify Rebuilt Checkout for One-Click Conversions

    How Shopify Rebuilt Checkout for One-Click Conversions
    Jun 30 2026
    In this episode, Lucas and Luna dive into Shopify's 2025 overhaul of its checkout engine, which reduced average payment time from 18 seconds to under 4 seconds. They explore the architectural choices — from server-side rendering to edge-computed state — that made one-click checkout possible across 2.7 million merchants. Lucas explains how Shopify decoupled payment processing from the storefront, adopted WebAssembly for client-side validation, and used a global edge network to precompute checkout state. Luna questions the trade-offs, including the complexity of supporting 100+ payment gateways and the challenge of maintaining PCI compliance at scale. The episode also touches on the impact on conversion rates, with early data showing a 6.2% lift in completed purchases. A focused case study in high-stakes web performance. #Shopify #Checkout #OneClick #WebPerformance #EdgeComputing #WebAssembly #PaymentProcessing #PCICompliance #ConversionOptimization #ServerSideRendering #Ecommerce #TechArchitecture #CTO #Engineering #FexingoBusiness #BusinessPodcast #Scale #StateManagement Keep every episode free: buymeacoffee.com/fexingo
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    12 mins
  • How Stripe Rebuilt Its Accounting Engine for Global Tax Compliance

    How Stripe Rebuilt Its Accounting Engine for Global Tax Compliance
    Jun 29 2026
    In this episode, Lucas and Luna dive into Stripe's latest architectural overhaul: rebuilding its core accounting and tax-computation engine to handle real-time sales-tax, VAT, and GST across more than 130 jurisdictions. They trace the engineering decisions behind moving from a batch nightly ledger to a streaming event-sourced system capable of recalculating tax lines mid-transaction without blocking checkout. Key numbers: Stripe processes over $1 trillion in payments annually, and the new engine runs 47,000 tax rules on average per transaction in under 12 milliseconds. Lucas explains the trade-off between eventual consistency and audit-grade accuracy, and why they chose Apache Kafka plus a custom FSM over off-the-shelf ERP middleware. Luna pushes back on the cost of maintaining 130+ rule sets and asks whether Stripe should have opened a public tax-engine API earlier. The episode ends with a reflection on whether tax compliance is the next infrastructure layer that every fintech will need to build or buy. #Stripe #TaxCompliance #AccountingEngine #RealTimeTax #EventSourcing #ApacheKafka #FintechArchitecture #GlobalPayments #VAT #SalesTax #StreamingLedger #TechInfrastructure #BusinessAndTechnology #CTOPodcast #EngineeringOrg #SystemDesign #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo
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    12 mins
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