Wix Engineering Blog

Building an AI tool to review API design taught us something fundamental about how AI approaches quality: it confidently optimizes for the least important parts. Instead of flagging the quality issues that actually hurt developers, like confusing workflows, hidden rules, or inconsistent mental models, it focused on the safe, measurable stuff: naming patterns, formatting mistakes, even typos. Developer experience issues just didn’t get caught, even though in our case, we speci

If you use AI to code, you’ve felt the "Context Wall." You start a project, things go great, but as the codebase grows, the AI starts making suggestions that conflict with previous decisions. You spend more time correcting the model than writing code To solve this, I developed the Design-Log Methodology . It started as a way for me to remember my own decisions in large projects, but it has become the single most important tool in my AI-coding workflow. The AI is no longer jus

A Year of Building at Scale: Inside Wix Engineering During 2025, Wix Engineering shared deep dives, playbooks, and real-world lessons from building and operating one of the largest web platforms in the world. These stories don't start as content. They start as engineering challenges - some of the most complex, high-scale, and unforgiving challenges modern software teams face. Problems that emerge only when thousands of developers, hundreds of teams, and hundreds of millions o

Imagine starting your day as a senior engineering manager at a fast growing tech company. You’re barely through your first coffee when your phone lights up with a critical ticket. The Kubernetes environments don’t match across stages. DevOps is in place. CI/CD, automation, monitoring, on-call rotations. And still, developers spend more time fighting infrastructure than building products. This is the moment many organizations mistakenly try to "add more DevOps." In reality, th

Intro: The Limits of Prompt Engineering In modern AI agent development, many teams, including ours at Wix , start with an intense focus on prompt engineering , carefully crafting instructions for the LLM. We iterated endlessly on system messages and instruction sets to solve a core problem: our AI scheduling assistant was struggling with vague requests, such as "Schedule a meeting with Jake." This simple sentence triggers a surprisingly complex challenge. The system must iden

Introduction For years, one of React’s most persistent performance pain points has been hydration. At Wix, where we render hundreds of millions of websites using React and SSR, we’ve experienced this problem at scale. SSR initially gave us everything we wanted - instant paint, great SEO, and full-site CDN caching. Our pages loaded faster than ever. But as sites grew richer and heavier with content, hydration became a tax we could no longer ignore. The more components a page h

Introduction  At Wix Emails we are working towards building a world-class email marketing platform along with an intuitive, fast, and reliable automated emails system. We care deeply about the quality of our products and work hard towards building a system that the users can count on. Thus, when we saw a strange but occasional error some time ago it was not a question of whether users noticed it and whether we should wait until enough people complained. We needed to fix it im

Please notice: This is Part 3 of a series of articles by Zachi Nachshon : Read the Part 1 to learn how Wix began migrating 60 codebases into a 22GB backend monorepo, and what we learned along the way. Read the Part 2 to learn how Wix reduced build durations, optimized target selection with a graph-based approach, and streamlined monorepo checks. The Local Development Bottleneck When working with a 22GB monorepo locally, we encountered several challenges, including: Git perf

Packed with engineering insights, developer stories, and tools to help you build better, faster, and smarter. Don't miss it, subscribe here . This month, we’re diving into cost-cutting wins, platform resilience, AI-powered coding, and productivity tips. Here’s what’s inside: 1. Leading Through Uncertainty: How Wix Engineering Navigates Growth, AI, and the Unknown Leadership begins where the playbooks end. When markets shift, technologies rewrite themselves, or new paradigms l

"We’ve entered the AI age. Bold and strong leadership isn't just an advantage, it's a necessity!" - Aviran Mordo Introduction: When The...

In Part 1 ( read here ), we shared how we built the foundations for cost-efficiency at Wix’s data platform: creating visibility into...

Packed with engineering insights, developer stories, and tools to help you build better, faster, and smarter. Don't miss it, subscribe...

Introduction At Wix, we are constantly evolving our data infrastructure to stay ahead of the curve. As our data workloads grew, we wanted...

Hi, I’m Ben Chen, an Engineering Group Manager at Wix. Over the years, my team and I have faced countless challenges managing one of the...

In this post, we share the journey of optimizing the data platform at Wix, which led to a 50% reduction in monthly data platform costs ....

What does it take to lead through chaos, scale engineering teams, and navigate one of the biggest technological shifts of our time? Watch...

Before You Read If you haven’t read our previous article  - " Solving Data Discovery at Scale: How Wix Uses RAG and Multi-Agent Systems...

Please notice : This is Part 2 of a series of articles by Zachi Nachshon . Read the Part 1 to learn how Wix began migrating 60...

The Challenge  Retrieval-Augmented Generation (RAG) has emerged as one of the most important design patterns in modern AI systems,...

Wix’s AI journey began with bold exploration of a fast-evolving technology - and developed into a clear, company-wide strategy. In this...

How do we scale Wix and still keep dev velocity and standards? Tomer Pilossof (Head of DevEx) and Ethan Pogrebizsky (CTO of DevEx)...

At Wix, we faced a challenge that will sound familiar to many developers: managing an ever-growing backend codebase spread across 60...

Introduction In the first part of this article (Introducing PlatySpark: How Wix Built the Ultimate Spark-as-a-Service Platform - Part 1)...

The Challenge Managing Apache Spark applications at scale can be a daunting task, especially for large organizations with multiple data...