Wand Synthesis AI Inc - Staff Fullstack Engineer, Backend Focus (Wandy)
Requirements
• Strong backend fundamentals: databases, data structures, async programming, and system design, with the ability to make real architectural calls rather than implement someone else's design. • Comfortable across the stack: solid front-end ability, even with backend as your focus, so you can ship a feature end to end. • Real product sense: ideally built for real end users on a genuine customer-facing (B2C) product, with an understanding of how internet products actually work, not internal or B2B tooling only. • Technology agnostic: you've worked across multiple stacks before and can pick up whatever this team needs. We care about your track record more than your specific stack. • Genuine ownership: a history of starting things from zero, not just delivering on initiatives someone else already scoped. • Startup experience, ideally somewhere genuinely chaotic: comfortable with shifting priorities and ambiguous ownership. If you've only worked inside companies with clean roadmaps and clearly defined scope, this probably isn't the right fit. • Heavy, real fluency with AI coding tools (e.g. Claude Code): you build with AI as a core part of your workflow, not an occasional assist. • Experience at a startup where you had to build something from scratch with little existing structure to lean on. • Deep backend build experience (e.g. Go, Node.js, or similar), designing and scaling services and data layers. • Comfortable on a small, high-caliber team with little process, ready to make architectural calls without a lot of hand-holding. • Front-end depth on a customer-facing product, so you can flex toward the UI when the team needs it.
Responsibilities
• Own backend architecture end to end for a greenfield product: design the services, data model, and APIs from scratch, decide what to keep and what to rethink, then build it. • Design data structures and system architecture for a customer-facing product built to scale, thinking through performance, reliability, and how the system behaves as usage grows. • Build and maintain backend services and APIs (we lean Go and Node.js, but we care far more about your track record than an exact stack match). • Contribute to the front-end as needed: every engineer here ships across the stack, so you should be comfortable building and reasoning about the UI even if backend is your focus. • Take true end-to-end ownership: propose the approach, defend it, then build it, without waiting for someone else to set the direction. • Build inside a fully AI-driven workflow, using tools like Claude Code as a core part of how you ship, not an occasional assist. • Operate comfortably in a small, fast-moving, ambiguous environment where priorities shift and you're often defining the "how," not just executing a pre-set plan.
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