Head of Growth

About Us
HeySunday is on a mission to make cleaning easier — and better for the planet. We sell innovative, space-saving alternatives to traditional cleaning products, including our signature laundry detergent sheets, dryer sheets, dishwasher sheets, and more. We believe that keeping a home clean should be simple, convenient, and low-waste, and we're building a brand that makes sustainable choices feel effortless for everyday households.

The Role
The Head of Growth owns growth for HeySunday. This means you are responsible for growth and the work that goes into it. You will set the strategy, manage the channels, run the experiments, understand the math, and make the calls on where we push, where we cut, and what we try next.

This is not a role for someone who wants to hand paid media to an agency and check in once a week. It is not for someone who wants to stay high-level while someone else is inside the accounts. It is for someone who wants to sit at the center of our growth engine, be hands-on daily, and have real impact.

Most of your time will be spent on HeySunday, roughly 80%. The rest will be spent on focused growth work across other Mechanism Ventures portoflio companies. That is part of what makes the role interesting.

You will see more business models, more constraints, and more growth problems than you would inside one company, then bring those lessons back to HeySunday.

 
What You Own
You are accountable for:
HeySunday’s full growth engine including: strategy, prioritization, and outcomes

Paid acquisition on Google Ads and Meta Ads at scale

Connected TV and Broadcast Ads

SKU testing

CRO across landing pages and funnels

The growth model that defines assumptions, targets, and constraints

Profitable revenue measured in ROAS, CAC payback, and contribution margin

You are not responsible for:
Inventory management

Cash management or P&L ownership

Customer support

General operations

People management or direct reports

 
What You’ll Do
Own paid acquisition end-to-end at HeySunday, including strategy, channel mix, budget allocation, and the day-to-day work inside Google Ads and Meta Ads Manager

Be in platforms daily, not just reading dashboards

Design, run, and read a high-cadence SKU testing program. Double down on what works and kill what doesn’t

Build and own HeySunday’s growth model and reporting layer

Direct Mechanism’s engineering, design, and creative teams to ship landing pages, ad creative, and funnel changes faster than any in-house team could on its own

Use AI and automation to compress cycle time by creating auto-pausing rules, LLM-generated creative variants, attribution scripts, and automated reporting

Spend roughly 20% of your time embedded in other Mechanism portfolio companies on time-boxed growth engagements

Codify what works into reusable playbooks, scripts, and automations that compound across the portfolio

Provide clear, written updates on results, learnings, and blockers on Mechanism’s standard cadence
 

Who You Are
This role is for someone who has led growth, but never got too far from the work.
You are likely a fit if you:
Have run meaningful budget through Google, Meta, or other paid acquisition channels

Know how to connect campaign performance back to unit economics, contribution margin, and profitability

Believe the best growth leaders are still operators, not just managers of operators

Think in systems, not just campaigns

Care deeply about unit economics and profitability

Want exposure to a portfolio of companies without being spread thin

Are comfortable making clear calls with imperfect information

 
Experience Required
6+ years in performance marketing

Deep, current hands-on experience running Google Ads and Meta Ads at material scale

Track record of profitable scale in DTC or e-commerce

Hands-on experience with SKU testing, landing page optimization, and CRO

Technical fluency - you’re building in Claude Cowork, used GA4, built living dashboards, or shipped scripts to automate parts of your workflow

First-principles thinking and bias to action where you ship in hours and days, not weeks

Strong written communication and instinct for tight, evidence-based reporting

Comfort leveraging AI, automation, and modern growth tooling