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

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

Fexingo

How MongoDB Rebuilt Its Replica Set Protocol for Planet-Scale Writes

July 04, 2026 2:34am 9 min

In episode 90 of The CTO Podcast, Lucas and Luna unpack the architectural story behind MongoDB's election protocol redesign. In 2023, MongoDB's replica sets could reliably handle about 10,000 writes per second per primar...

How Adobe Rebuilt Photoshop for the Browser

July 03, 2026 3:13pm 11 min

In this episode of The CTO Podcast, Lucas and Luna dive into Adobe's multi-year effort to bring Photoshop to the browser. They explore the technical challenges of porting a 35-million-line C++ codebase to WebAssembly, th...

How GitHub Migrated 100 Million Repositories to a New Storage Engine

July 03, 2026 2:33am 7 min

In this episode of The CTO Podcast, Lucas and Luna dive into the technical and organizational challenges behind GitHub's migration of over 100 million repositories to a new Git storage engine. They explore why GitHub nee...

How Dropbox Rebuilt Its Sync Engine for 700 Million Users

July 02, 2026 2:50pm 10 min

In this episode of The CTO Podcast, Lucas and Luna dive into the technical architecture behind Dropbox's sync engine, which handles file operations for over 700 million users across every major platform. They explore the...

How Skyscanner Migrated 300 Microservices to Event-Driven Architecture

July 02, 2026 2:37am 9 min

Lucas and Luna dig into how Skyscanner, the travel meta-search giant, moved 300 microservices from a synchronous REST model to an event-driven architecture over two years. They cover the concrete trigger (a 2022 outage c...

How Palantir Rebuilt Its Foundry Ontology for Government AI Deployments

July 01, 2026 2:55pm 7 min

Lucas and Luna unpack how Palantir redesigned its Foundry ontology to scale from prototype to production across federal agencies. They focus on the architectural shift from a monolithic object model to a modular, policy-...

How Netflix Rebuilt Its Content Delivery for 300 Million Subscribers

July 01, 2026 6:14am 9 min

Lucas and Luna dive into how Netflix rebuilt its content delivery network to serve over 300 million subscribers across 190 countries. They explore the shift from a third-party CDN to Netflix's own Open Connect CDN, the c...

How Coinbase Rebuilt Its Blockchain Node Infrastructure

June 30, 2026 2:53pm 11 min

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 spe...

How Shopify Rebuilt Checkout for One-Click Conversions

June 30, 2026 2:41am 12 min

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 r...

How Stripe Rebuilt Its Accounting Engine for Global Tax Compliance

June 29, 2026 3:06pm 11 min

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. ...

How Stripe Built a Payment Infrastructure for 100 Countries

June 29, 2026 2:30am 8 min

In this episode of The CTO Podcast, hosts Lucas and Luna dive into Stripe's architectural journey from a simple payment API to a global infrastructure handling payments in over 100 countries and 135 currencies. They expl...

How Datadog Rebuilt Its Observability Pipeline for 100 Trillion Events Daily

June 28, 2026 2:45pm 13 min

Episode 79 of The CTO Podcast dives into the engineering behind Datadog's core pipeline. Hosts Lucas and Luna unpack how Datadog re-architected its ingestion, processing, and storage layers to handle over 100 trillion ev...

How Figma Built a Real-Time Multiplayer Design Engine

June 28, 2026 2:29am 10 min

Lucas and Luna dive into the technical architecture behind Figma's real-time collaboration engine. They explore how Figma moved from a standard web app to a custom multi-user sync layer using Operational Transform and CR...

How Stripe Built a Payment Infrastructure for 100 Countries

June 27, 2026 2:51pm 9 min

In this episode, Lucas and Luna dive into how Stripe rebuilt its core payments engine to handle compliance, currency, and latency across over 100 countries. They explore the architectural decisions behind Stripe's global...

How Loom Rebuilt Its Video Engine for Async Communication

June 27, 2026 2:43am 9 min

In this episode of The CTO Podcast, Lucas and Luna dive into how Loom rebuilt its video recording and streaming engine to handle over 200 million videos per year while keeping latency under one second for uploads and pla...

How Discord Rebuilt Its Voice Engine for Zero Packet Loss

June 26, 2026 2:55pm 11 min

Lucas and Luna explore how Discord moved from a standard WebRTC stack to a custom UDP transport layer, achieving sub-50ms latency and near-zero packet loss during peak gaming events like Call of Duty launches. They break...

How Airbnb Rebuilt Search for 8 Million Listings

June 26, 2026 2:31am 10 min

Lucas and Luna dive into the technical decisions behind Airbnb's 2024 search architecture overhaul. With 8 million active listings and billions of queries daily, Airbnb moved from a monolithic Elasticsearch cluster to a ...

How GitLab Built a Single Codebase for One Million CI Pipelines

June 25, 2026 2:41pm 7 min

In this episode, Lucas and Luna dive into the specific technical decisions GitLab made to scale its CI/CD platform from tens of thousands of pipelines to over one million per day. They focus on the choice of a monolithic...

How Slack Rebuilt Its Search Index for 10 Million Daily Queries

June 25, 2026 2:31am 7 min

Slack's search is used over 10 million times a day. But the original Elasticsearch-based index couldn't keep up as the platform grew to billions of messages. In this episode, the CTO Podcast breaks down how Slack's engin...

How Notion Rebuilt Its Sync Engine for Offline-First

June 24, 2026 2:53pm 10 min

Lucas and Luna dive into Notion's technical journey to rebuild its block-based sync engine for offline-first and real-time collaboration. They explore the architectural shift from optimistic local writes to a hybrid loca...

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