Builder.io today launched Fusion 1.0, a major milestone in AI-assisted software development and the first AI agent designed to connect the entire product lifecycle—from requirements and design through code implementation—inside one unified workflow.

Today’s product organizations rely on a constellation of siloed tools: PMs write specs in Jira, designers build UI flows in Figma, and engineers translate both into code inside an IDE. Each handoff increases friction, slows iteration, and introduces misalignment. Fusion 1.0 collapses that gap by enabling all three roles to work together directly on the live product with AI acting as a shared, context-aware collaborator.

A Unified AI That Understands Design, Code, and Product

Fusion 1.0 natively integrates with Slack, Jira, Figma, and GitHub, allowing teams to work inside the tools they already use while eliminating the traditional disconnect between ideation and implementation.

• Tag @Builder.io in Slack to convert a team discussion into a structured feature request.

• Assign a Jira ticket to the Builder bot to automatically generate a new branch and begin implementation.

• Designers can work in a visual canvas that writes real, production-ready code using existing component libraries and design tokens.

• Developers can review PRs that Fusion automatically updates based on their feedback.

At its core is Fusion’s context engine, which understands a team’s design system, component architecture, APIs, and data sources. That allows it to generate code aligned with existing patterns, fill in missing context, adapt to evolving requirements, and improve with every commit and review.

Builder.io says Fusion has already transformed over 10 million designs and PRDs into production features across some of the world’s largest enterprise organizations.

AI Collaboration Without the Handoffs

Builder.io CEO Steve Sewell argues that most AI tools supercharge individuals—but not teams. Fusion aims to change that dynamic.

“Most AI tools today make individual contributors faster but leave teams disconnected,” Sewell said. “Fusion 1.0 is different — it lets PMs, designers, and engineers build together in one environment where code is the common language. It's how software teams finally move from handoffs to collaboration.”

That shift is already visible in live team workflows. One UX design lead at a global enterprise services company described the impact:

“We’ve done this live in team meetings — people throw out an idea, and we just build it in front of them. What used to take months now happens instantly. Once leadership saw that, they said, ‘We need this everywhere.’”

Enterprise-Grade from Day One

Fusion supports the architectures and frameworks enterprises already run, including:

• React and modern component-driven JavaScript frameworks

• Custom internal design systems

• Multi-layered, legacy enterprise architectures

• MCP server support for databases, APIs, and deployment tools such as Supabase, Netlify, and Zapier

Additionally, Fusion offers:

• Granular permissions and role-based access control

• AI model flexibility across OpenAI, Anthropic, and Google

• Secure alignment with corporate governance and compliance requirements

The result is an AI agent flexible enough for startups yet powerful and controlled enough for large enterprises operating at scale.

The Bigger Picture: AI Is Rewriting the Software Development Stack

Fusion 1.0 reflects a growing shift: AI isn’t just accelerating coding—it’s rearchitecting how teams collaborate. The next wave of enterprise software doesn’t replace developers; it removes the artificial barriers between product, design, and engineering, allowing teams to iterate in real time on the actual product instead of documents about the product.

Builder.io’s Fusion stands out by grounding this vision in a team-first, code-backed environment that works inside existing enterprise ecosystems.

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