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Web & Mobile Apps

Software built around how your business actually works.

Off-the-shelf tools make you work around them. Custom apps are built around you — your workflow, your customers, your growth. From booking systems to customer portals to native mobile apps, we build it to spec. Fixed price. No surprises.

  • Fixed price — quoted before we start
  • iOS & Android from one codebase
  • You own the code, outright
A custom mobile app dashboard running on a phone
What we build

$3,000+

Fixed price, scoped before a line of code is written

  • Customer portals — login, dashboards, accounts
  • Mobile apps — iOS & Android, React Native
  • Booking & scheduling — appointments and payments
  • Internal tools — dashboards, inventory, workflows
  • E-commerce & ordering — subscriptions, checkout
  • 35k

    Users on Tax Transcript Pro — a York Coders platform

  • 4–8

    Weeks to deliver most tools and portals

  • 100%

    Code ownership — you keep everything we build

  • $0

    Hidden fees — fixed price quoted before we start

What We Build

Six types of apps that drive real business results.

Not every business needs the same thing. Here's what we build most often — and the outcomes each one creates.

  • 01

    Customer Portals

    Login, dashboards, account management

    Give your customers a login — view orders, track jobs, download invoices, submit requests. Reduces the number of “where's my order?” calls and positions your business as more professional than competitors.

    • Client dashboard
    • Job tracking
    • Document access
    • Support tickets
  • 02

    Mobile Apps (iOS & Android)

    One codebase, both platforms

    Native-quality mobile apps built in React Native — one codebase, both platforms. Lower cost than two separate apps, same performance. Customers can use your service without opening a browser.

    • React Native
    • iOS & Android
    • Push notifications
    • Offline support
  • 03

    Booking & Scheduling Systems

    Appointments, calendar, payments

    Customers book appointments online — you stop managing it manually by phone and email. Automatic confirmations, calendar sync, reminders, and payment collection built in. Works 24/7 without you.

    • Online booking
    • Calendar sync
    • SMS reminders
    • Stripe payments
  • 04

    Internal Tools & Dashboards

    Software for your team, not your customers

    Inventory management, job dispatch, quote generators, staff scheduling — anything that currently lives in a spreadsheet or an outdated system.

    • Inventory tracking
    • Job dispatch
    • Staff management
    • Reporting
  • 05

    E-Commerce & Online Ordering

    No third-party order fees

    Custom storefronts, restaurant ordering systems, subscription flows — built to your exact needs rather than squeezed into a Shopify template. Faster, lower fees, and no monthly platform cost.

    • Custom checkout
    • Subscriptions
    • Multi-location
    • Inventory sync
  • 06

    API Integrations & Automation

    Make your existing stack talk

    Connect your existing tools — CRM, accounting software, payment processors, shipping APIs. Stop copying data between systems manually. We build the integrations that make your stack actually work together.

    • QuickBooks
    • Stripe / PayPal
    • Twilio / SMS
    • Custom APIs
How It Works

From idea to live app — no guesswork.

Most app projects fail because the scope isn't defined before work starts. We fix that in week one.

  1. 01

    Discovery Call

    We ask questions, you describe the problem. We turn that into a clear feature list — what the app does, who uses it, and what success looks like. Free, no commitment.

    Free · no commitment

  2. 02

    Fixed Quote

    You receive a written scope document and a fixed price. No hourly billing, no scope creep surprises. You know exactly what you're getting and exactly what it costs before we start.

    Written scope

  3. 03

    Build & Review

    We build in sprints and share progress regularly. You see real, working software throughout — not just at the end. Feedback is incorporated as we go, not after launch.

    Two-week sprints

  4. 04

    Launch & Handoff

    We deploy, test, and hand over the code — it's yours, completely. We train your team, document the system, and stay available for questions. Ongoing support available on a monthly plan.

    You own the code

Technology

Modern stack. No lock-in, no dependencies.

We build with tools that have long-term support, large ecosystems, and easy handoff. You're never stuck because we used an obscure framework no one else knows.

  • Frontend

    React / Next.js

    Web frontends with server rendering and fast navigation.

  • Mobile

    React Native

    iOS and Android apps from a single maintained codebase.

  • Backend

    Node.js

    APIs, business logic, background jobs and integrations.

  • Data

    PostgreSQL

    Relational databases that stay correct as the app grows.

  • Infrastructure

    AWS

    Hosting, storage and deployment on enterprise-grade cloud.

  • Payments

    Stripe

    Checkout, subscriptions, invoicing and payouts.

  • Messaging

    Twilio

    SMS reminders, notifications and two-factor auth.

  • Delivery

    GitHub

    Version control and CI/CD — your code, in your account.

Why Custom?

Off-the-shelf tools make you work around them.

SaaS tools are fast to start. But the monthly fees add up, the limitations frustrate your team, and eventually you outgrow them. Custom software is built once and owned forever.

Off-the-shelf SaaS

  • Cost — $50–500/mo per tool, forever
  • Fit — you adapt your process to the tool
  • Branding — their logo, their UI
  • Data — lives on their servers, export is limited
  • Lock-in — you can't leave without losing everything

Custom — York Coders

  • Cost — one-time build cost, you own it
  • Fit — built around your exact workflow
  • Branding — fully branded as your business
  • Data — your data, your database, your control
  • Lock-in — you own the code, take it anywhere
Who We Build For

Long Island businesses that have outgrown generic tools.

We work best with businesses that know what problem they're trying to solve, even if they're not sure what technology should solve it.

  • 01

    HVAC & Field Services

    Job dispatch & technician app

    Assign jobs, track technicians in the field, generate invoices on-site. Replaces phone calls and paper job sheets.

  • 02

    Healthcare & Clinics

    Patient portal & booking

    Patients book, fill forms, view results, and message staff — without calling the front desk for every interaction.

  • 03

    Restaurants

    Online ordering & table management

    Custom ordering system with no third-party fees — you keep 100% of every order instead of paying 15–30% to a delivery platform.

  • 04

    Accounting & Finance

    Client portal & document workflow

    Clients upload documents, view statements, and sign forms — replacing email chains and manual chasing.

  • 05

    Contractors & Construction

    Quote builder & project tracker

    Generate quotes, track project stages, and let clients sign off digitally — from a phone on the job site.

  • 06

    Retail & Wholesale

    Inventory & order management

    Track stock across locations, manage reorders, and give staff and customers a single system that actually reflects reality.

Questions

App development FAQs — common questions

Realistically, custom applications start around $3,000 for a focused tool and scale from there based on scope. We scope it honestly and give you a fixed price before you spend a dollar.

Have a problem that
needs a custom solution?

Tell us what you're trying to build or the problem you're trying to solve. We'll come back with a clear scope, a realistic timeline, and a fixed price. Free discovery call — no commitment.

  1. 1

    We review your site

    We look at your current site together and tell you honestly what's costing you customers.

  2. 2

    We give you a plan

    We tell you exactly what we'd do, in plain English. No jargon, no upsell.

  3. 3

    We give you a price

    A real fixed number, not a range. No pressure to say yes on the call.

Fixed price — no hourly billingYou own the codeiOS & AndroidFree discovery call
or call directly

Call us: (843) 981-9580
Mon–Fri, 9am–6pm EST — typically reply within hours

Tell us about your project

Fill this in. We typically reply within a few hours — not days.

No commitment. If we’re not the right fit, we’ll tell you. We reply within hours, not days.

Service Areas

Web design across all of Suffolk County

We’re based in Selden, NY and serve businesses across Long Island. Whether you’re in Smithtown or Port Jefferson, Ronkonkoma or Stony Brook — we work with local businesses every day and we know what Long Island customers search for on Google.

Every site we build is optimized for the specific town and neighborhood your customers are searching from. Local SEO isn’t a checkbox for us — it’s built into every project from day one.

York Coders provides web design in Selden NY, web development in Suffolk County, local SEO for Long Island businesses, and website maintenance across Long Island. We specialize in building fast, SEO-ready websites for small businesses in Centereach, Coram, Port Jefferson, Smithtown, Ronkonkoma, Stony Brook, Lake Grove, Holtsville, Holbrook, Medford, Farmingville, Brookhaven, and all surrounding areas of Suffolk County, New York. See every service area

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