Senior Full Stack Developer
Knak
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Knak is a mission-driven company Why? Because our time is limited, our competition is fierce, and our margin for error is small. To have the biggest impact on the world, we stay focused on our core mission, which is... Empowering marketers to be creative. That’s why Knak exists. In a world where AI has made everyone a creator, Knak helps marketers turn ideas into on-brand, high-performing campaigns at scale. The world's most AI-forward companies, including Meta, OpenAI, NVIDIA, Vercel, Notion and Stripe, use Knak as their agentic marketing production layer. Here's what they and our investor Insight Partners figured out: creation got easy, but that’s making production harder. Every new idea and brief still has to be built, versioned, checked, approved, and shipped across every channel, and that work runs on handoffs, review cycles, and a lot of copy-paste. That middle stretch of the marketing stack has no system, no standard, and no owner. Knak is the flexible factory for that work. Our customers set the brand rules, choose the tools that feed in and the platforms that send, and decide where AI does the work and where people do. We handle the repeatable parts, so marketers get their time back for the parts that aren't. We're built by marketers, for marketers. We started with email because it's the hardest channel to get right and where many campaigns win or lose. Now we're bringing that same production discipline to every channel our customers use. The Role: Senior Software Developer, Editor We're looking for an experienced full-stack developer to join the team behind Knak's editor, where marketers design on-brand emails and landing pages without writing code. It's a complex, stateful application: a structured document model, a canvas that renders it live, reusable and lockable modules, translations, version history, and realtime collaboration so whole teams can build together. You'll work across the entire editor and take ownership of our realtime collaboration engine: the CRDT-based sync layer, running on Cloudflare Workers and Durable Objects, that lets multiple people, and increasingly AI agents, edit the same asset at once. This is a hands-on role for someone who loves hard frontend architecture and isn't afraid of the distributed-systems problems underneath it. You'll also contribute to architecture decisions, mentor teammates, and work with product and design to shape how marketers create. What You'll Be Doing Build the editor: Design and ship features across our Vue 3 and TypeScript editor, including the canvas, attribute panels, undo/redo, selection, modules and locks, and translations. Keep it fast and correct on large, complex designs. Own realtime collaboration: Evolve and scale our multi-user editing engine (CRDTs, WebSockets, and Cloudflare Workers with Durable Objects). Harden it against reconnects, stale clients and partial failures, and make sure every editor feature behaves correctly when several people are editing at once. Evolve the document model: Extend the structured document format behind every asset, and the pipeline that turns it into production-ready email and landing-page HTML. Enable AI-driven editing: Partner with our AI team so agents can edit designs through the same operations and sync model as people. Build reliable APIs: Develop and maintain the Laravel (PHP) APIs and persistence behind the editor, with a focus on testability, observability and performance. Own it in production: Instrument, monitor and roll out changes safely with feature flags, and debug issues end to end, from the browser through the edge to the database. Elevate code quality: Lead design and code reviews, write down architectural decisions, and keep the bar high. Collaborate and mentor: Work with product, design, QA and DevOps, and share deep knowledge of the editor so the whole team can work on it confidently. What You Should Bring 6+ years of software development experience, with significant full-stack work Experience…