Phones. Bookings. Payments. Spreadsheets. I make the pieces work together, so you can step away knowing nothing is slipping through the cracks.
Let’s untangle your workday Find the right starting point
Mark Nadyuk. Your engineer, from first call to handoff.Buckeye, Arizona · In person across the Valley · Remote across the US
See how we’ll work togetherSelect a step.
See the thinking behind it.
These are tools I’ve worked with, not the limits of what I can connect. I choose what fits your business and can work with other platforms when the integration supports it.
Zapier
n8n
Google Apps Script
Google Workspace
Google Sheets
Quo
Twilio
Square
Lightspeed
Stripe
Next.js
React
TypeScript
Tailwind CSS
Supabase
PostgreSQL
Vercel
Railway
Cloudflare / Turnstile
Swift / SwiftUI
Playwright
Testing Library
Sentry
Python
Node.js / test runner
AI SDKIndependent service provider. Nadyuk Systems is not affiliated with, endorsed by, or sponsored by the companies behind these tools. Names and logos belong to their respective owners.
Explore the toolkit and project evidence on GitHubMost owners start with one quick fix, so you see it work before spending more. When you're ready for connected workflows, a website, a customer portal, or a full new-business setup, the same person handles it. Tap Add to my brief on anything that sounds familiar and I'll get the list with your message.
“When we're with a customer or on a job, callers hang up and call the next shop on Google.”
The moment a call can't be answered, a friendly, natural text goes out from your business number, so the caller knows you saw them and can reply right there.
“We lose hours to phone tag, and no-shows leave gaps in our day.”
Missed-call text-back plus clean online booking, instant confirmations, and timed reminder texts that cut down on no-shows.
“Happy customers forget to leave a review, and custom orders ghost before they pay.”
Pick the one fix you need most: timed review requests after a job, an order and deposit form without the back-and-forth, or a clean opt-in text list for regulars.
“Customer history is stuck in the register and old sheets. Nobody knows who stopped coming in.”
The setup from case study 01: connect Square, Lightspeed, Clover, or Toast to one de-duplicated customer list, caller ID, opted-in check-in texts, and daily staff call lists.
“We send estimates, get busy, and never follow up. That's money left on the table.”
A tracking pipeline built around how your crew actually works (Google Sheets, Close, or self-hosted Twenty CRM). Quotes follow up politely on their own and collect a deposit when the client says yes.
“Our site is slow on phones, hard to update, or fills our inbox with bot spam.”
3 to 6 fast pages built for local Google search and people calling from their phones, with forms protected by Cloudflare Turnstile and rate limits.
“Off-the-shelf software doesn't fit how we work, or charges us per seat forever.”
Customer logins, a Postgres database (Supabase) where each customer only sees their own rows, server-confirmed Stripe payments, and automated browser tests before any change ships.
“We're opening a new location and need everything working together on day 1.”
Done in clear flat-fee phases: domain and Google Workspace email, business phones, choosing a POS, online booking, payments and invoicing, CRM, review flow, and written staff how-tos.
“I know we're wasting hours every week. I just don't know what to fix first.”
After a free 15-minute call, I look at how your business actually runs and hand you a written plan: what to fix first, which tools, what upkeep costs, the timeline, and a flat quote.
Client work stays private. I never publish client names, customer records, or real screenshots without written permission. What I do publish: anonymized breakdowns and rebuilt scripts running on clearly labeled fake data, in a public GitHub portfolio anyone can check.
Context first. I built this in summer 2026 for my employer at the time (a two-location Phoenix-area CBD shop), not as a paying Nadyuk Systems client. It ran about 2.5 months before the brand left Arizona and the owner began closing the store, which was too soon to measure sales or ROI. The numbers below are the verified data cleanup and segmentation, plus the working follow-up system the owner relied on.
Based on clean_customers.py in the public repo. Run the de-duplication and consent rules on messy fake rows.
Each one came from something actually breaking during the build. They protect every system I touch now.
Automations write only to a locked, append-only tab. Staff sort and filter separate view tabs, so nobody accidentally scrambles live rows.
Writing even a blank value into an ARRAYFORMULA column silently kills the whole column. Formula columns stay unmapped and protected.
Zapier and n8n map sheet columns by position. Once live, new fields only get added on the far right.
Walk-ins, cash tests, and delivery apps get filtered out before they ever reach your customer list or trigger a text.
Phones get normalized to +16025550199 before matching. Live register contact info wins, while past visits and spend add together.
Loading names into caller ID helps staff answer the phone. Marketing texts only go out when a customer has a recorded opt-in with a timestamp.
Context first. Since June 2026 I've been building a private software application on my own time and risk. It isn't a client project and hasn't launched, so I don't name it or show screenshots. What I share here are the engineering practices and guardrails from 1,233 commits, and how they protect a small business website or portal.
Bot checks, rate limits, same-origin checks, and public keys that can add an inquiry but never read or delete records.
For you: quote and booking forms arrive clean, without junk bots.
The database itself enforces access row by row, and automated tests fail if a server key ever ends up in browser code.
For you: a client portal where nobody can peek at someone else's file.
Every change runs unit tests and real-browser Playwright tests before it merges, with one-click rollback.
For you: updates don't take your site down on a busy Saturday morning.
Every database change is a saved script, and records that fail a check get set aside for review instead of quietly disappearing.
For you: your customer and order history never gets scrambled by an update.
Real-time crash and failed-request alerts reach me with the details, while visitors see a graceful fallback.
For you: I hear about a broken booking link before your customers do.
Orders and deposits are only marked paid when Stripe's server confirms it directly to your backend.
For you: deposits and online orders that can't be faked.
Piece the software together yourself at 11 PM, or sign a $500+/month agency retainer where you don't even own your own phone number or customer list. Here's the third option.
| What matters to you | Doing it yourself after hours | A typical marketing or software agency | Working with me |
|---|---|---|---|
| Who owns the accounts and customer list? | You do, but it's scattered across 5 logins. | Often locked in the agency's account. Leave, and you lose your setup. | You, 100%. Every account is in your name, on your card, from day 1. |
| How is it priced? | “Free,” but it costs your evenings, weekends, and missed follow-ups. | Monthly retainers ($300–$1,500/mo) plus software markups. | One flat fee. 50% to start, 50% at go-live. Zero software markup. |
| Who do you actually talk to? | Support chatbots and YouTube tutorials. | A salesperson first, then rotating junior account managers. | Me. On Zoom, in a Loom video, or in person around the Valley whenever you need it. |
| What tools get used? | Whatever you already bought, even if it's fighting you. | One rigid template every client gets forced into. | Problem first, tool second. Keep what works; connect or build only what's missing. |
| How do you know it worked? | Guesswork, when you remember to check. | Vanity charts: “impressions” and “clicks.” | A 4–6 week pilot measuring real missed calls, bookings, and repeat visits, plus a 14-day free fix window. |
Most callers don't leave a voicemail. They tap the next shop on Google. Put in your own numbers and see what that adds up to.
This is your arithmetic, not my promise. If we work together, we measure the real number during the pilot.
Walking to the next shop, every month
$975
At your numbers, a $750 missed-call text-back would cover itself in about 4 weeks. After that, it keeps working.
Half to begin, half at go-live, once everything passes the checks we wrote into your agreement. Nothing is billed by the hour unless you sign off on it first, and no ongoing subscription is ever required.
A plain-English conversation about what keeps slipping. If it's outside what I do, I'll tell you right away.
I look at how you run things now and deliver a written plan: what to fix first, which tools, upkeep costs, timeline, and a flat quote. Credited in full if you start a build within 30 days.
One targeted fix with tools you already have: missed-call text-back, review requests, an order and deposit form, or an opt-in text list.
Missed-call text-back plus online booking with automatic confirmations and no-show reminder texts.
Several systems working together, like register → Google Sheets → caller ID, texts, and daily staff call lists (case study 01). Most land between $3,000 and $6,000.
3 to 6 pages, fast on phones, basic Google search setup, spam-protected forms, and a privacy page. Most land between $2,000 and $4,500.
Secure logins, a database where customers only see their own records, Stripe payments, and custom dashboards, built and priced in phases (case study 02).
Domain and Google Workspace email, phones, booking, POS, payments, CRM, review flow, and staff how-to guides, quoted flat per phase.
Basic, $450/quarter: upkeep, fixes, and a quarterly check-in. Growth, $900/quarter: Basic plus one new automation each quarter. Anything out of scope is $100/hr, and only after you sign a change order.
Proudly AmericanBuckeye, Arizona
I'm Mark Nadyuk, 26, a first-generation American and the son of Ukrainian parents. I love this country. A big reason why is free enterprise: here, anyone willing to put in the work can open a shop, start a crew, or build something of their own.
Small businesses are where that happens every day. I started Nadyuk Systems to give owner-run businesses the kind of systems big companies take for granted, at a price that makes sense, so you keep more of your time and more of what you earn.
Owner-run shops, offices, and crewsMost of my clients. No IT department needed. That's what I'm for.
Growing and mid-size businessesWelcome too. Same flat prices, same written plan, same person on the job.
Mega-corporationsNot my focus. They have plenty of firms already. I'd rather spend my time on Main Street.
Whatever you sell, wherever you're from, whatever you believe, you get the same price, the same plan, and the same respect.
I'm based in Buckeye, and I'm hands-on. The Valley is also huge, so most of our day-to-day happens over Zoom and short Loom videos, and I come to you in person whenever it helps. Outside Arizona, the same process runs fully remote.
West Valley · my neighbors
Goodyear, Avondale, Surprise, Peoria and Glendale. Day to day we use Zoom and Loom, and I come out in person whenever you need it.
Illustrated coverage · Not a street map
Distance rings measured from Buckeye.
You always know what I'm working on, what access I have, and how your staff will use the setup once it's live.
Tell me what's eating your week. No tech talk needed. We figure out if it's a quick fix or needs discovery.
You get exact deliverables, the checks it has to pass, a flat price, and our starting numbers in writing.
I build and test on fake data first, with my own login and 2FA, never a shared password. The 50% deposit starts the build.
We check every item together, I walk your staff through the written how-to (in person or on Zoom), and it goes live. The other 50% is due then.
Anything I built that breaks in the first 14 days gets fixed free. We track the 4–6 week pilot against the baseline.
You invite me as an individual user with 2FA and only the permissions the job needs. Never by texting a password. Production changes are agreed before they go live, and my access is removed at handoff. Texts only go to customers who opted in.
Health and care practices get front-office contact and scheduling only, never medical records or clinical intake, and a BAA is signed before I handle any covered patient contact details. Need networking, bookkeeping, or legal work? I coordinate with trusted specialists and stay your one point of contact.
You don't need a technical brief. Answer three quick things and your message writes itself. It goes straight to me at mark@nadyuksystems.com. The worst case is a free 15-minute conversation.
What you type stays in your browser until you send it. Please leave customer records and passwords out of a first message.