Senior Fullstack Engineer

• Build and ship features across the full stack that directly grow revenue, conversion, and retention - you'll see your work in the metrics within days of shipping.
• Design and implement the technical architecture for growth features, in‑app experiments, and lifecycle and monetisation flows – making pragmatic decisions that balance speed with maintainability.
• Identify and build growth loops – referral mechanics, pricing and packaging experiments, and features that compound usage across both sides of the marketplace.
• Use AI coding tools (Cursor, Claude, Copilot, or whatever works best for you) as a first‑class part of your engineering workflow – we actively encourage this and want to learn from how you do it.
• Contribute to how the team uses AI beyond your own workflow – sharing patterns, tools, and approaches that make the whole squad faster and better.
• Work closely with the PM and designer in tight, fast feedback loops – you're not waiting for specs to be 'done' before you start thinking about implementation.
• Run A/B experiments end‑to‑end: implement the test, instrument the events, analyse the results, and feed the findings back into the next iteration.
• Write clean, well‑tested code that the team can build on – and raise concerns when you see technical debt accumulating that will slow us down later.
• Participate in architecture and technical design conversations – your opinion on how to build things matters here, not just that you can build them.
• Stay close to the latest in AI tooling, engineering practices, and developer productivity – and bring what you learn back to the team.
• Mentor more junior engineers and help build an engineering culture that's proud of both its speed and its craft.

• 5+ years of full‑stack engineering experience, with a track record of shipping production features in Type Script/Node.js and React (or equivalent modern stack).
• A genuine bias for action – you default to building and learning, not deliberating and waiting. You know how to ship something imperfect and iterate fast.
• Active, fluent use of AI coding tools in your day‑to‑day workflow – you've moved beyond the basics and have a clear view on where AI makes you faster and where it doesn't.
• Strong instincts for technical trade‑offs in a fast‑moving environment – you can tell the difference between debt that's fine to carry for now and debt that will hurt the team in two sprints.
• Experience building and instrumenting A/B experiments, feature flags, or other data‑driven engineering patterns.
• Comfort working close to the product – reading dashboards, questioning metrics, and understanding the 'why' behind what you're building.
• Clear, direct communication – you can explain a technical decision to a PM in two sentences and to a fellow engineer in a whiteboard session.
• Based in or willing to commute to Boston regularly for in‑person collaboration.

Demonstrates extensive experience in Full‑Stack Engineering with a focus on Type Script, Node.js, and React, while effectively utilizing AI coding tools to enhance productivity. Capable of designing and implementing growth features and A/B experiments, with strong communication skills to collaborate closely with product managers and designers.

• AI Coding Tools
• Cursor
• Claude
• Copilot