Principal Front-End Engineer [Growth]

3Play Media is a technology company making video accessible to everyone. They are seeking a Principal Front-End Engineer to join their Growth team, focusing on building and managing infrastructure for their products and enhancing the overall development experience.

Responsibilities:

• Build up our agent tools and workflows — custom Claude skills, MCP servers, agent loops, and the developer-experience scaffolding around them — so every engineer is meaningfully faster, and so non-technical team members can safely ship content changes and agent-coded pages using Claude Code
• Do real product work in our Remix and Astro applications alongside the rest of the Growth team — building product pages, managing our design systems, and improving marketing page layouts
• Dive into our infrastructure to support agents and app development — including Cloudflare (Workers, routing, edge config), Sanity CMS, GitHub Actions, and the product deployments we manage with Werf / Helm / Kubernetes
• Keep our frontend foundation modern, sane, and beautiful
• Set up monitors, tests, metrics, dashboards, and traces so we have confidence in page weight, SEO, uptime, accessibility, and visual regressions

Requirements:

• 8+ years of front-end and infrastructure-adjacent web development, with deep experience in at least one modern React meta-framework (Remix, Next, Tanstack Start, or similar)
• Active, daily use of AI coding agents in your real work (Claude Code, Cursor, Codex, or similar), with a track record of building the harness — not just using it. Your own rules, skills, MCP servers, subagents, or agent loops
• A high-agency, bias-for-action way of working. If we hand you a problem outside your immediate stack — a Cloudflare Worker, a Helm chart, a database schema — your default is to roll up your sleeves and figure it out
• Cloud fluency with Cloudflare (Workers, Pages, DNS, R2, edge config) and AWS (S3, CloudFront, Lambda@Edge, Route53, IAM, ECS)
• Experience setting up deployments and preview environments on GitHub via GitHub Actions or similar
• A track record of leading non-trivial frontend migrations — framework upgrades, theme foundations, build-tool swaps, monorepo restructures — without stalling product work in the process
• Smart opinions about the package ecosystem, dependency hygiene, lockfile discipline, and the cost of every package you add
• Understanding of a headless CMS and marketing SEO needs — Sanity preferred, but experience with Ghost, Contentful, WordPress headless, or similar is great
• Strong API and database schema design skills
• Empathy and communication skills — you'll work closely with marketing, design, product, and engineering to align on requirements and translate them into direct, actionable work
• A design sensibility — you can tell when something looks off before a designer does, and you care enough to fix it
• You've shipped animation-heavy marketing or product pages with Framer Motion, Lottie, Remotion, Rive, or similar
• You've maintained a public-facing site with a meaningful Lighthouse / Core Web Vitals budget
• You've built or contributed to internal developer tooling that other engineers actually love using
• Experience with Kubernetes and Terraform
• Experience with a Rails monolith environment