Michael Marsack
Growth & GTM Engineering · Open to remote roles · Available now

Michael Marsack · Growth & GTM EngineeringI build products that grow themselves.

The next internet won't be browsed. It'll be asked. Most companies hire one person to build the product and another to grow it. I've been both: real-time AI features and the growth engine behind them at a personal AI company, 30,000+ users at under $30 each. Paid acquisition, referral loops and in-app moments people want to share, wired to analytics you can trust.

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 4

Growth & acquisition

$2M+ in ad spend. 30,000+ users. Under $30 per acquired user and under $100 per engaged user, in a crowded consumer AI market. At Hello Haven I ran influencers alongside paid, built the referral program and its in-app UI, and built the marketing site and every landing page.

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

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

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

Users a month
Blended cost per user

$30 per paid user is my number from Haven. Creator cost and the referral rate are yours to set; every market prices attention differently.

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. Dinner doubled as a staff meeting. So I figured it out, and I still do. I take the problem, not just the task, and when something is beyond me I learn it fast or call the person in my network who has already solved it.

  2. Competitor

    Division I javelin

    I threw javelin for Duke, which means I spent four years trying to throw a spear farther than strangers while a man with a tape measure wrote it down. In Division I track every throw is measured and every result is public, so you learn to train for the one number that matters and to own it in the open. 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. Operations shows you what engineers rarely see: where the money goes, where the customers leave, and which problems decide whether the company lives.

  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. Fifty launches teach the same lesson fifty ways: the product that wins is the one people understand in a minute.

  5. 2026

    Building personal AI

    As Director of Growth Engineering at Hello Haven, a personal AI company valued at over $50 million, I owned both halves of the problem: the product, with real-time vision and live calls, and the growth engine that brought in 30,000+ users at under $30 each. I learned what it takes for people to let an AI into their everyday life. It has to be simple, and it has to earn trust.

  6. Next

    The interface that acts for you

    Software is changing from something you operate into something that acts for you. Most of it will be clumsy or creepy. The companies that win will make it feel as simple as a text message and as trustworthy as a friend. That's the problem I want to spend the next decade on, with people who feel the same pull.

Act IV · The work

The work behind the numbers.

That's the work. Let's talk about yours.

Let's talk
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 to Nov 2026
  • 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 to 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 to 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 to 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 to 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

  • Build the moment people share

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

  • 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.

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

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

  • Listen, then cut

    Customers rarely tell you what to add. Listen hard enough and they tell you exactly what to remove.

  • 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.

  • Taste is the job now

    Anyone can build anything now. The work is deciding what deserves to exist and what it should feel like. That's taste, and it's the job.

On a team

What I'm like to work with.

  • Lead it or row it

    I've run a company's operations as COO and I've been the guy in the trenches at 2 a.m. Hand me the whole thing or hand me a piece of it. Both get done, and I won't make it weird about which one.

  • Nobody has to ask

    If it's broken and nobody owns it, congratulations, I own it now. I take the problem, not the ticket.

  • Sprints, then another sprint

    My best work came in short pushes with a finish line: pick the target, go hard, ship, read the numbers, go again. Marathons are for people who like meetings.

  • Competitive as hell

    I threw javelin for a Division I program. I physically cannot not keep score. Give me a number to beat and I'll be checking it before coffee.

  • Sharp teams only

    Fewer meetings, more demos, decisions by Friday. If your team ships like that, we'll get along fast. If it doesn't yet, that's a project I'd enjoy.

  • Make the business part easy

    Billing, support, onboarding, reporting: the boring stuff every company runs on. I build it so it runs itself, and the team gets to spend its hours on the interesting part.

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.

  • A paid engine you can read

    Cost per user by channel, every week, with the losers killed on schedule. $2M+ managed at under $30 a user.

  • Creators and video, in-house

    Influencers, UGC creators, a production team and the ad network of your choice, hired and directed by me.

  • A referral loop inside the product

    The moment people already screenshot, made one tap, and the in-app UI that drives it. Built at Haven.

  • Attribution you trust

    Every click tagged, every sign-up tied to its source, before a dollar goes to ads.

I learn fast, decide faster, and when I'm wrong I say so first.

Finale · Let's talk

Got something hard? Let's build it.

Software is about to start acting for people, and someone has to build the version they trust. I want a long run on a product like that, hard and worth it, on a sharp team that keeps score and likes a sprint, 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.

Let's talk
Emailmichael.david.marsack@gmail.com
LinkedInlinkedin.com/in/michael-marsack ResumeRead it on one page
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Hiring for something else? Pick the role.

Product & Growth The product, and the engine that grows it. AI Engineering Real-time voice, vision and agents, shipped end to end. Product Engineering Web and mobile products where every screen earns its place. Product Management Listening, hard cuts and features that ship. Strategy & Special Projects Operations, sales and the hard, undefined problem.