Long Island Web Developer

Long Island Web Developer — Custom Code Only

A Real Web Developer, Not a Template Assembler

Most Long Island businesses can build their website in two weeks with a WordPress theme and some smart design. A real subset of Long Island businesses need something fundamentally different — software. They need a custom portal for internal teams, an API integration between the CRM and the accounting platform, a booking system that actually matches their workflow, or a full SaaS product they plan to sell. That is where a senior Long Island web developer earns their keep.

MIS Services Inc has been writing production code for Long Island businesses for over fifteen years. Our engineering team has shipped custom web applications for law firms tracking litigation workflows, medical groups managing referrals, manufacturers running quote automation, logistics companies managing fleet dispatch, nonprofits handling donations at scale, and dozens of other Nassau and Suffolk businesses that outgrew off-the-shelf software.

Custom code is high-risk work. A junior freelancer can get a basic feature working, but production software lives in the edge cases — concurrency, data consistency, error handling, security, scaling, and the messy reality of real users doing unexpected things. Our team has done this for fifteen years. We have shipped, broken, debugged, and rebuilt enough production systems to know where the landmines are.

Below: the six services we offer, our tech stack, transparent retainer pricing, and how to get a free code audit. For traditional WordPress, see our Long Island WordPress developer page. For visual design and brochure sites, see web design Long Island.

Six Development Services

What We Build for Long Island Businesses

Custom Web Applications

Internal portals, dashboards, member areas, booking systems built around your actual workflow. Not template plugins — production software.

REST & GraphQL APIs

API design, authentication (OAuth, JWT), rate limiting, versioning, documentation. APIs other developers can actually use.

Third-Party Integrations

Stripe, Twilio, HubSpot, Salesforce, QuickBooks, ShipStation, Shopify APIs. We have shipped production integrations with all of them.

SaaS MVP Development

Founders with a SaaS idea — we build the MVP in 6-12 weeks. Authentication, billing, multi-tenancy, basic admin. Then you iterate from real customer feedback.

Legacy Modernization

Inherited a 10-year-old PHP codebase nobody can maintain? We can refactor, modernize, or rebuild incrementally without taking your business offline.

Take Over Failing Projects

Previous developer disappeared? Codebase is a mess? We have rescued dozens of half-finished projects on Long Island. Code audit first, honest assessment, then plan.

Our Tech Stack

What We Actually Write Code In

Most Long Island web "developers" build everything in WordPress or Wix. We pick the right tool per project. Below is the production stack our team actively ships code in. We name them because no other Long Island web developer ranking on Google does.

Node.jsNext.jsReactPythonDjango/FastAPIPostgresMongoDBAWSVercelStripeTwilioRedisDockerTypeScript

For client work, the stack choice depends on the problem. A high-traffic public website gets Next.js. A back-office portal might get Django + Postgres. A real-time application might get Node.js + WebSockets. SaaS MVPs often get Next.js + Postgres + Stripe + Vercel — a stack that ships fast and scales. We are not religious about any single tool.

Development Retainer Pricing

Three Tiers by Monthly Engineering Hours

New projects quoted separately (typical range $5,000-$50,000+ depending on scope). Below are ongoing retainers for active development on existing applications.

Starter

$499/month

Small custom maintenance retainer

✓ Up to 5 dev hours/month
✓ Bug fixes + minor features
✓ Code monitoring
✓ 1 strategy call/month

Get Started

Practice

$999/month

Active development on an existing application

✓ Up to 12 dev hours/month
✓ Feature development
✓ API integrations
✓ Performance monitoring
✓ Monthly strategy call

Get Started

Network

$1,999/month

Continuous development partner

✓ Up to 25 dev hours/month
✓ Dedicated senior engineer
✓ Architectural advisory
✓ Bi-weekly strategy calls

Get Started

FAQ

Frequently Asked Questions

How is a web developer different from a web designer?

Web designers build websites — visual design, marketing pages, brochure sites. Web developers build software — custom applications, APIs, integrations, SaaS products, internal tools. Most Long Island agencies sell themselves as 'developers' but actually do design only. We do real development.

What tech stack do you actually write code in?

Production stack: Node.js, Next.js, React, TypeScript, Python (Django, FastAPI), Postgres, MongoDB, AWS, Vercel, Stripe, Twilio, Redis, Docker. We are not religious about any single tool — we pick by project fit. Most Long Island web 'developers' build everything in WordPress or Wix. We pick the right tool.

How much does custom web development cost?

New project quotes range $5,000-$50,000+ depending on scope. SaaS MVPs typically $15,000-$40,000. Internal portals $8,000-$25,000. API integrations $3,000-$12,000. Ongoing development retainers: $499/month (5 hrs), $999/month (12 hrs), $1,999/month (25 hrs).

Can you take over a project that another developer started and abandoned?

Yes. We have rescued dozens of half-finished projects on Long Island. The process: code audit first (1-2 days), honest assessment (is it salvageable or should you rebuild?), then a plan. We have inherited PHP codebases, abandoned React projects, and broken WordPress customizations. Most are recoverable.

Do you build SaaS products?

Yes. We have built SaaS MVPs in 6-12 weeks for Long Island founders. Authentication, billing (Stripe), multi-tenancy, basic admin, the core feature set. Then you iterate from real customer feedback. We do not build 'final' SaaS in v1 — we build the MVP that lets you test the market.

Can you integrate my CRM with my accounting platform?

Yes. We have shipped integrations between Salesforce/HubSpot CRMs and QuickBooks/Xero accounting platforms, between Shopify and ShipStation, between WordPress and Mailchimp/Klaviyo, between custom apps and Stripe billing. APIs are our daily work.

How is your engineering different from a freelancer or offshore team?

Senior engineering, fifteen years of production code. We have shipped, broken, debugged, and rebuilt enough systems to know where the landmines are. A junior freelancer can get a basic feature working — production software lives in the edge cases: concurrency, data consistency, error handling, security, scaling. We handle all of that.

Do I own the code you write?

Yes. You own everything we write for you, full source code, no licensing strings attached. We typically use a GitHub or GitLab repo that you have access to from day one. When the engagement ends, you keep everything.

Do you offer ongoing development retainers?

Yes. Retainers from 5 hours to 25 hours per month, billed monthly. Suitable for businesses with existing production software that needs ongoing feature work, bug fixes, performance tuning, and architectural advisory.

How do I get started?

Call 347-410-8416 or fill out the contact form. Free 30-minute project audit. Tell us what you are trying to build (or fix) and we will tell you honestly whether we are the right team, what the stack should be, and what realistic timelines and budgets look like. We turn down projects we cannot deliver.

Need a Real Engineer?

Free 30-minute project audit. Tell us what you are trying to build (or fix) and we will tell you honestly whether we are the right team, what the stack should be, and what realistic timelines and budgets look like.

Get a Free Audit →Call +1 347-410-8416

Long Island Web Developer — Custom Code Only

A Real Web Developer, Not a Template Assembler

Six Development Services