Michael Marsack
Product & Growth · Open to remote roles

Michael Marsack · Growth & AI Product EngineerI build the product, and the engine that grows it.

Most companies hire two people for that. At Hello Haven, I'm both. As Director of Growth Engineering I ship real-time AI features, and I built the engine that pulled in 30,000+ users at under $30 each. Before that: COO, founder, Division I athlete.

Let's talk See the work Résumé
  • $2M+Ad spend managed
  • 30K+Users acquired
  • <$30Per acquired user
  • $750K+Sales I closed
  • 50+Projects shipped
Act I · What I'm best at

Pick a skill. Watch it work.

Skill 1 of 5

Systems & infrastructure

At Hello Haven I built dozens of internal systems, the entire marketing tech stack (including an automated system that posts ads across platforms) and the full analytics stack. At Martech Studios I've shipped 50+ web, mobile and machine learning projects, plus support systems that scale.

See it inHaven's growth engine Analytics and referrals Martech Studios
Act II · Try it

Don't take my word for it. Run the numbers.

Three small, live models of how I think about growth. Change the inputs and watch what moves.

Users a month today
At under $30 per user

$30 is what I reached at Hello Haven, in consumer AI, across $2M+ of spend. Every market prices attention differently; the first conversation is about yours.

Act III · My story

Competitor. Operator. Founder. Builder.

  1. Roots

    Raised to own the outcome

    I grew up in a family of blue-collar business owners where the standard was simple: figure it out, or let me do it. It made me resourceful early, and it's still how I work. I take the problem, not just the task, and when something is beyond me, I learn it fast or call someone in my network who has already solved it.

  2. Competitor

    Division I track

    Division I track is a sport where every rep is timed and every result is public. It taught me to train for the metric that matters and to stay accountable to it. If it's not hard, it's not worth doing.

  3. 2021 to 2023

    Operator

    I came into technology through operations. At Word On The Block I went from Head of Operations to COO in nine months, then ran operations as fractional COO of Salesa AI, an AI outbound sales product.

  4. 2022 to now

    Founder

    I founded Martech Studios and acquired a micro SaaS. I've closed $750K+ in sales personally and built the technology and marketing systems for companies that have raised $25M+ combined, across 50+ projects.

  5. 2026 to now

    Building personal AI

    As Director of Growth Engineering at Hello Haven, a personal AI company valued at over $50 million, I own both sides of the business: real-time vision and calling in the product, and the growth engine that acquired 30,000+ users at under $30 each.

  6. Next

    The interface that acts for you

    Software is shifting from tools people operate to agents that act on their behalf. The companies that win will make that shift feel simple and trustworthy. That's the product problem I want to spend the next decade on.

Act IV · The work

The work behind the numbers.

Seen enough? Send me the problem you're stuck on. I'll reply with how I'd attack it.

Send me a problem Get the résumé
Act V · The résumé

Where I've done it.

Director of Growth Engineering

Hello Haven · Personal AI assistant, valued at over $50 million
Mar 2026 – Present
  • Oversaw $2M+ in ad spend and helped grow the user base to 30,000+ users.
  • Cut cost per acquired user below $30 and cost per engaged user below $100 in a competitive consumer AI market.
  • Built Haven Vision, plus FaceTime-style video calling and screen sharing.
  • Set up the full marketing tech stack and analytics stack, and built the referral program.
  • Built dozens of internal systems and shipped several dozen product features and UX improvements.

Owner

Martech Studios · Development studio
Oct 2022 – Present
  • Founded and run a studio that builds web and mobile apps for founders and small businesses, and acquired a micro SaaS.
  • Closed $750K+ in sales personally, from first call to signed contract.
  • Helped businesses that have raised over $25 million combined build their technology and marketing systems.
  • Designed and delivered 50+ client projects spanning web, mobile and machine learning.

Fractional COO

Salesa AI · AI outbound sales
Sep 2022 – Mar 2023
  • Ran operations for an AI tool that finds qualified leads across social platforms and automates outreach.
  • Led growth marketing and customer communication.

Chief Operating Officer

Word On The Block · Marketing technology, New York
Jan 2021 – Oct 2022
  • Promoted from Head of Operations to COO within 9 months.
  • Ran operations for a video overlay product that helped creators earn ad income and gave advertisers low-cost reach.

Earlier experience

Net Effect Ventures · Nth Cycle · O.C.E.A.N.S. Advocacy Group · Duke University
2017 – 2020
  • Strategy and Project Manager (Intern), Net Effect Ventures: built KPIs and workflows for a team of eight, managed three, and led the build-out of a fully digital startup incubator curriculum.
  • Market Research Associate (Intern), Nth Cycle: researched lithium-ion battery manufacturing and recycling and turned it into an investor-ready portfolio.
  • Duke University: BA, Evolutionary Biology. Student Representative with awards for alumni donation results, and Resident Assistant for 50 American Dance Festival students.
Act VI · How I work

How I work

  • Taste is the job now

    When technology can build anything, taste is all that matters.

  • Fewest clicks to aha

    Every click is a chance to lose someone. Sign-up lives on the landing page and works for everyone. Getting there takes hard cuts.

  • You hire my network too

    It's not only what I know. It's what I and my network know. If I can't do something yet, I learn it fast. If it can't wait, I already know someone who has done it.

  • Build the moment people share

    Products spread through moments worth showing someone. I build those in, so every user brings the next one.

  • Less is more

    Charles Perrow showed that complex, tightly coupled systems fail in ways nobody predicts. So I cut parts, steps, screens and data until nothing is left to confuse anyone.

  • 10 who love it beat 1,000 who don't mind

    Love spreads. Okay doesn't. I build for the 10.

How I teach a product

Teach inside the product. Everything else is a fallback.

Use the highest rung you can. Each step down reaches fewer people.

  1. Interactive guides with videoTeach inside the product, at the moment someone needs it.
  2. No interactive guide? Make videos.Show the exact clicks.
  3. No videos? Write posts with pictures.Screens, arrows, one task per post.
  4. No pictures? Write one very specific post.Answer one question completely.
  5. Nothing at all?Then you don't have a business.
Act VII · What you get

What your team gets.

  • Websites, apps and tools

    Web, mobile and internal tools. Give me an afternoon and you'll have a working app.

  • A growth engine

    Paid, referrals and landing pages at under $30 per acquired user.

  • Real-time AI features

    Voice, vision, video calls and agent memory. Shipped end to end.

  • A video team and ad network

    I'll stand up a production team and run the ad network of your choice.

  • Support on every channel

    Answers people wherever they reach you, and scales as you grow.

  • Product updates on autopilot

    Release notes and update posts that publish themselves the moment you ship.

Quick learner. Faster decision maker.

Finale · Let's talk

Got something hard? Let's build it.

I want a long run on a product that's hard and matters, with people who've stayed up until 2 a.m. on something because they couldn't put it down.

Open to remote roles in AI engineering, product engineering, growth and GTM engineering, product management, strategy and special projects.

Send me a problem

P.S. Not hiring yet? Send it anyway. One line about the hardest product or growth problem on your plate gets you my honest take on how I'd attack it. No pitch attached.

Emailmichael.david.marsack@gmail.com
LinkedInlinkedin.com/in/michael-marsack ResumeRead it on one page
Encore

Hiring for something else? Pick the role.

AI Engineering Real-time voice, vision and agents, shipped end to end. Product Engineering Web and mobile products where every screen earns its place. Growth & GTM Engineering Acquisition, referrals and moments people share. Product Management Listening, hard cuts and features that ship. Strategy & Special Projects Operations, sales and the hard, undefined problem.