For fifteen years I sold and designed. Outdoor kitchens on show floors, historic houses for travelers, closings for buyers. I was very good at it. It was never the whole of me.
The part I loved was the sketch on the back of the brochure: the thing that did not exist yet. Three years ago I started building it myself, in AI, automation and code. The last nine months happened in the open: 65 repositories, 2,120 commits, 20 products in production. That is not a hobby. That is what I am.
Today I run Modern Mustard Seed, an AI product studio, and Cross + Covenant, a brand with its own software. Sales taught me what people will pay for. Building is what I do with that.
Both are bootstrapped and both run on agents, so they need less of me every month. What they need now is runway and reach. A fractional seat gives me both, and gives you someone who has already made every zero-to-one mistake on her own dime.
A voice agent is only interesting if it can act.
Anyone can make a phone bot that talks. I program agents that reach into the business and do the work while the caller is still on the line.
☎ Call Mr. Mustard · (406) 312-1223
Ten things I made. Most are running now.
Three fixes
Found by reading the numbers, not by waiting for a complaint.
The build that could not fire.A voice tool stopped sending its payload on every call. The heartbeat said healthy. The cause was one enum inside an array schema that emptied the whole object. Found it, fixed it, wrote the rule so it cannot come back.
The bounce rate nobody could see.An email webhook was never registered, so delivery looked perfect. She built a reconciler that recovered the real number, then a brake that halts a day of outbound after two bounces in twenty-five sends.
One voice standard, everywhere.Callers were getting names spelled with letter sounds. She wrote the standard, built the installer, and applied it across the whole org in one command.
Cross + Covenant
A faith apparel brand she designs and runs at crossandcovenant.co. The off-the-shelf storefront was not good enough, so she built the stack around it.
- Headless storefrontA custom Next.js front on Vercel with Shopify checkout and Printify fulfilment behind it. Every pixel hers; the cart and the taxes theirs.
- Daily devotionalA devotional every day and Bible reading plans, free, delivered to the site and the inbox by the same system that runs the store.
- Prayer wallA public wall with a moderation workflow, so a request never sits unread.
- Art pipelineImage generation, an alpha knockout cutter, a 4500 by 5400 print-file step. An idea becomes a live collection in a morning.
- Higher and SentAn iOS formation app, local first. And scripture art you print, place in the world, and scan.
Before the agents, houses and kitchens.
- 2025 to nowFounderModern Mustard SeedAI product studio. Voice agents, agentic systems, custom software, websites.
- Oct 2024 to Jun 2026VP of SalesPresidential Title GroupModernized closings with technology; saved buyers real money at the table.
- 2019 to 2023Founder and hostHello Sunshine PropertiesTurned 26 of Jacksonville’s most historic homes into short-term rentals. Acquisition, design, hosting, and on the hard days, crisis counselor and cleaner. Led a team of five.26homes96%occupancy4.9rating
- 2008 to 2017Designer and sales managerParadise Grilling SystemsNational home show circuit. Sold $5,000 to $50,000 outdoor kitchens, more than $3 million a year personally. Managed six.
Florida State University, International Affairs.
Every problem gets walked around before it gets built.
Mornings in the lake. Sundays behind a camera.
She lives in Bigfork, Montana, on Flathead Lake. Most mornings start in the water with her husband and their two dogs, before the fog lifts off the bay. It is where the ideas arrive. On Sundays she is on the production team at Fresh Life Church, behind a camera and on the Resi stream: live, no second take. Good training for shipping.
Three years building. Nine months in the open.
Proof, live: modernmustardseed.com · the-system · demos · audit · seedside · alpenglow · irl · crossandcovenant.co · ddlandscaping.pro · fiatluxdesign.co · huckwild · wildmere · westridge-timber · hallelujah-house · prayerhouse-coffee
Wanted
Cell (406) 250-6076 · Mr. Mustard, her agent (406) 312-1223
linkedin.com/in/sarahmscarano · Save my contact
Have an idea? I have a Tuesday.
Fractional, contract or advisory. Remote. The first conversation is free, and I will probably have a prototype for you by the second one.
sarah@modernmustardseed.com · (406) 250-6076 · Save my contact