Phil Karlton famously said there are only two hard things in computer science: cache invalidation and naming things. While naming things may be subjective, cache invalidation is a problem that only gets harder as our systems grow more complex. As applications scale and users expect real-time data everywhere, traditional approaches to cache management crack under pressure.

Here's the thing about cache invalidation: it sits right at the center of the classic performance versus consistency trade-off. Mess it up, and your users are stuck looking at stale data. Maybe they see yesterday's stock prices, or worse, they're making business decisions based on outdated metrics. But nail the consistency part while implementing it poorly, and you've just thrown away all the performance benefits that made you add caching in the first place. This fundamental tension has been driving innovation in caching strategies for decades, from simple Time-to-live (TTL) expiration to increasingly complex dependency tracking systems.

Backend systems face constant pressure from multiple directions: user requests demanding instant responses, databases struggling under query loads, and servers managing finite computational resources. This backend pressure—the cumulative stress of handling concurrent requests while maintaining performance and resource constraints—manifests in bottlenecks, latency spikes, and system instability. Traditional approaches often treat these pressures as isolated problems—adding a cache here, optimizing a query there—resulting in complex patches that fix symptoms but ignore deeper architectural issues.

The conventional solution? Event-driven architectures and streaming systems. But here's the problem: these approaches force developers to manually create and manage streams, handle async complexity, deal with event schemas, and debug distributed streaming pipelines. You end up spending more time on streaming infrastructure than on your actual business logic.

Think of a financial portfolio app: instead of calculating portfolio performance each time a user loads their dashboard, the server maintains continuous streams where position changes flow through pricing calculations, which flow through performance metrics, which flow through sector aggregations. Or an e-commerce site where product price changes automatically update product views, category aggregations, search indices, and recommendation scores in real-time. Rather than computing results on demand, reactive systems keep computational pipelines running continuously, so the answers are always up-to-date and ready for immediate use—reducing latency and spreading load over time instead of spiking under demand.

Skip makes it fast and easy to build reactive services which efficiently update their outputs in response to input changes, powering real-time features and saving resources by avoiding unnecessary recomputations.

The technical foundation that makes this possible is Skip's hyper-efficient reactive computation graph, which is written in the Skip programming language, runs natively, and takes great pains to efficiently represent and manipulate the data underlying your reactive system.

However, that still requires memory, compute, and other resources -- so what do you do when traffic spikes or grows beyond the capacity of even a powerful single machine? Scale out and distribute your reactive service across more machines, of course!

Hello skippers. Today, we are introducing a new template to our collection: React + Vite. While our previous blog posts focused on building skip services, this new template represents our first step into the frontend, bringing together the best of both worlds: front and back.

npx create-skip-service my-skip-chat --template with_react_vite

Hello Skippers. Today, we are excited to announce the release of create-skip-service: A CLI Tool for Skip Service Development. It aims to simplify the development workflow by providing a convenient way to bootstrap new Skip services.

npx create-skip-service <project-name> <options>

Hello Skippers. Today, we are going to plug a PostgreSQL service and our starting point is the following project on GitHub: Skip Postgres Demo. We will demonstrate how to use Skip's reactive data streaming with a PostgreSQL backend. This project implements a simple blog post system with real-time updates using Skip's streaming capabilities.

Reactive programming often sounds complex—but it doesn't have to be. What if you could actually see how data responds to change, in real time, right from your terminal?

In this tutorial, we walk through building a small proof-of-concept social network backend using Skip and TypeScript. It tracks users, groups, and their friendships—with automatic updates to "active friends" using Skip’s reactive computation graph.

You’ll learn how to:

• Set up a reactive Skip service
• Define users and groups as live-updating resources
• Connect it all to a REST API using Express
• Observe real-time updates as the data evolves

"The simpler, the merrier" — this project keeps things minimal, focused, and easy to explore.

From Alice adding a new friend to live data reactions, this guide makes reactive systems tangible.

Event-Hidden Architectures​

How did we get here?​

One of the most powerful and consistent trends in software for the past decade has been the move from single stack to cloud native applications. Cloud native applications are inherently distributed and have become popular as developers are drawn to the convenience of containers and platform-as-a-service infrastructure.

The API-ification of important subsystems means today hardly anyone would consider implementing their own payments, shipping, SMS, chat, billing or shopping cart functionality. Instead they’ll lean on Stripe, Twilio, Shopify, Shippo, etc; accelerating time-to-value and further distributing the functions of the application.

In the last few years developers have moved quickly to incorporate more and diverse AI features into their applications, but AI models and application logic compute requirements are quite different from one another and therefore seldom run in the same stack, further distributing the application.

The Skip framework is a system for building and running incremental backend services, simplifying the challenges of engineering complex reactive systems.

While Skip reactive services compose naturally with each other, they must also coexist with other backend systems with non-reactive semantics and APIs.

This blog post describes some recent enhancements we've made to the Skip framework to make it easy to bridge the reactive/non-reactive interface for popular systems like PostgreSQL and Kafka, and shows how you can build similar integrations with other systems and APIs.

The News

We’re pleased to announce that SkipLabs has raised $8 million to bring incremental computing to applications everywhere. We intend to use the entirety of this funding to enhance the open source Skip project and grow the developer community.

This financing also means we get to work with Lenny Pruss at Amplify Partners who have invested in some of today’s most prominent developer platforms such as dbt Labs, Prisma and Temporal to name a few and Alex Mackenzie at Tapestry VC. Check out Amplify’s blog post that shares their view on SkipLabs and the future of reactive systems and Tapestry’s blog post on why they chose to invest.

We are also humbled to earn the support of individual investors like Adam Gross, Spencer Kimball, Yann LeCun, Tom Occhino, Olivier Pomel and Nicolas Vasilache.