Lead Product Architect

Castle; New York (NY); On-site; USD 120,000 - 200,000; Full time

Job summary

Castle is seeking a mid-senior level engineer-turned-product architect to shape product logic and design at a technical level. This role requires experience in defining complex product systems and a hands-on approach to building products. The position is primarily on-site in Brooklyn, with some remote flexibility for exceptional candidates.

Qualifications

• Experience in shaping complex product systems and flows.
• Ability to think behavior-first in product design.

Responsibilities

• Define logic for product concepts and API behaviors.
• Decide user experience across pricing plans.

Skills

Product Systems

Behavior Design

Complex Logic

Job description

3 days ago Be among the first 25 applicants

Direct message the job poster from Castle

This is an engineer-turned-product architect role, not a product manager role. If you’ve never written and shipped production code, designed developer APIs, or worked on scale-critical infrastructure, this isn’t your kind of product role.

Castle is building the Stripe of bot and fraud prevention. We’re a profitable, nimble team serving customers like Canva, Framer, and Atlassian.

Technically, Castle is a real-time edge module plus in-app API that executes a risk pipeline and responds in milliseconds.

You’ll work directly with Johan (CEO / acting Head of Product) in a tight shaping loop, co-designing product logic from first principles at a deeply technical level. Alongside our Product Designer, Product Engineer, and Product Marketer, you’ll form the core product function.

Location

This is most likely an on-site Brooklyn role. You’ll be working closely with Johan on a day-to-day basis to define Castle’s behavior from the inside out. For exceptional candidates, we’re open to remote if you can embed in NYC for 4–6 weeks during onboarding, and 1–2 weeks per quarter going forward.

What you'll do

• Define the logic behind key product concepts: what runs on the edge vs in-app, what APIs should look like, and how their behavior scales across tiers
• Decide what users see in free vs paid plans, what gets gated, and when we prompt them to upgrade
• Structure flows across endpoints, event tracking, policy creation, and blocking logic
• Define the default behaviors for blocked requests, scored requests, and anomalous patterns. When to alert, when to act
• Decide when to reveal vs hide complexity. Especially around detection, scoring, and policy behavior

What we’re looking for

• You’ve shaped real product systems—flows with complex logic, pricing gates, or state-based UX
• You think in behavior first, then interface
• You’d rather build the product with the founder than manage a roadmap at a big org
• Bonus points if you’ve worked in fraud, devtools, or infra. But clarity and taste matter more than domain.

How to apply

If this role sounds like it fits how your brain works, reach out directly to Johan on DM. Include links to anything that shows how you think; products, posts, mockups, memos, or just raw thoughts.

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

• Industries

  Software Development

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