[Hiring] Freelance Design Engineer @Mass Culture

Role Description

Mass Culture is a paid media agency and growth partner for mission-driven scale-up brands. We build and run our own client portal: the product our clients log into to see their media plans, budget pacing, cross-channel performance, and the reports we deliver.

We're looking for a part-time engineer to build features in it end to end, and to make them look as good as they work.

What You'll Build

• Client-facing surfaces:
  • Dashboards
  • Widgets
  • Charts
  • Report and deck builders
• Admin surfaces:
  • Widget builder
  • Plan editor
  • Pacing tools
  • Configuration panels
• The data plumbing a feature needs:
  • Postgres schema and migrations
  • Server actions
  • Connector work against ad-platform APIs
• Polish passes on surfaces that already work but don't yet feel finished.

The Stack

• Framework: Next.js 16 (App Router), React 19, TypeScript
• Data: Supabase — Postgres, Auth, row-level security, BigQuery
• Styling: Tailwind CSS v4, Radix UI, a token-based design system
• Charts: visx
• Editors & interaction: Tiptap, dnd-kit, Zustand
• Tooling: bun, Vercel

What We Mean by a Good Eye:

• You can take a rough spec and produce a surface that looks considered, without being handed a mockup.
• You work in the design system rather than around it.
• You notice spacing, alignment, and type hierarchy without being asked.
• You can make a chart readable, not just correct.
• You know the difference between a surface that is done and one that is merely working.

How We Work Together:

• Asynchronous and autonomous.
• You pick up scoped work, build it in a branch, and open a pull request.
• We write things down.
• Verify your own work.
• This codebase is built heavily with AI coding tools.
• Say when something is wrong.

Qualifications

• Strong React and TypeScript, with real Next.js App Router experience: server components, server actions, and caching behavior.
• Comfort with SQL and relational data modeling.
• Work you designed as well as built, in a portfolio or a repo we can look at.
• The ability to work independently in an unfamiliar, opinionated codebase.
• Clear written communication.
• Reliable part-time availability.

Requirements

• Data visualization experience, especially charts built on real, messy data.
• Supabase or Postgres row-level security experience.
• Experience with analytics, reporting, or BI-style products.
• Comfort in design tools.

Engagement

Part-time, freelance, remote, and ongoing. Hours and rate are flexible and agreed up front. We start with a small paid scoped project so both sides can find out whether it's a fit before committing to more.

To apply, send a note and a link to something you designed and built.

Mass Culture on Inclusion

We hire great people from a wide breadth of backgrounds, not only because it’s the right thing to do, but also because it makes our work, our company and our communities stronger. Mass Culture is committed to creating a diverse environment and is proud to be an equal opportunity employer.