Lead Product Engineer

This role is with one of Dex's trusted partner companies. We work closely with their teams to truly understand their culture, goals, and what they're looking for, so we can match you with the right opportunity and give you context about the role before you commit to a process. If you're interested sign up to Dex to apply. Dex is an AI recruiter agent that helps you run your job search. Tell Dex your stack, seniority, and what you want to build. We will manage your applications and surface other opportunities that are a fit. The role This company builds large-scale simulated populations of AI personas, grounded in real-world behavioural data, to help Fortune 500 organizations test strategies against audiences they couldn't otherwise reach. Backed by leading investors, they're solving a hard, impactful problem at the intersection of AI and market intelligence. This is their first lead-level product engineering hire. You'll own features end-to-end, from architectural decisions to UI details, working directly with the CTO and designer. This isn't just building a component; it's shaping the product's future, turning frontier AI research into client-facing solutions, and setting the engineering standard for a growing team. The work Own the full vertical slice of new features: from front-end interaction and API design to database schema and deployment.Make critical architectural decisions on system design, data models, and API contracts that will define the product for years.Translate cutting-edge AI simulation capabilities into robust, user-facing product features for Fortune 500 clients.Ensure product reliability and performance, sweating details like latency, empty states, and small interactions that define user experience.Establish the engineering bar for system design and code quality as the team scales, mentoring future hires. What You Bring 5+ years shipping production software, consistently owning features from concept to deployment, and acting as a go-to engineer for complex problems.Expertise in TypeScript and comfort across the stack; productive in Python for integration with the core simulation engine.Deep understanding of full-stack performance: browser rendering, API latency, caching, concurrency, and debugging across the entire system.Advanced database skills (preferably Postgres), including indexing, query optimization, and zero-downtime schema migrations.Proven experience designing scalable architecture, defining service boundaries, and establishing robust API contracts.Fluency with AI coding agents (e.g., Claude Code, Codex) to accelerate development while maintaining high code quality standards. Why apply through Dex This is a rare, high-impact lead role at a company building truly novel AI products. Roles like this are often hard to find and highly competitive. Apply through Dex to cut through the noise, get a proper brief, and ensure your application stands out. If you're interested, sign up to Dex to apply - https://jobs.meetdex.ai/jobs/6ed461e4-c225-4446-848a-cc86ce456c59 As part of the recruitment process at Dex, we process your personal data in accordance with our Privacy Notice for Job Applicants. This notice explains how and why your data is collected and used, and how you can contact us if you have any concerns.