[ Solutions ]

All your software,
one lab.

A software lab, not an agency. Every project starts with a fixed-price audit.

01Software rescueWe fix and finish software others left behind.
02SaaS & business softwareFrom MVP to the software your business runs on.
03Mobile appsiOS and Android apps, all the way through App Store approval.
04AI & agentsAI agents that actually do the work.
05AutomationBusywork runs on its own.
06SEO & AI visibilityFound on Google. Cited by AI.
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Lunarion Labs / Solutions / SaaS & business software

SaaS development company in New York

Custom SaaS development and business software: MVPs, subscription products, client portals, internal tools and marketplaces.

[ The reality ]

SaaS & business software

A successful SaaS is not a feature list. It is a stable product people understand, recurring billing that runs on its own, and a codebase that can grow without breaking. We scope the smallest version worth launching, ship it in stages you can use, and keep the foundations clean from the first commit.

[ 02 / 06 ] · From MVP to the software your business runs on.

[ Our commitments ]What we guarantee.

100%in your name: code, accounts and access
0service downtime during the work
1senior lead, from first call to launch
4steps, always in this order

[ What we do ]

From MVP to the software your business runs on.

We build SaaS products that bill from day one and internal tools that save your team hours every week. Senior engineers, your code, your accounts.

  1. 01

    MVP development

    The smallest version worth launching, scoped with you, built fast and put in front of real users.

    [ Scoping ] [ Prototype ] [ Launch ]

  2. 02

    Internal tools and business software

    Replace spreadsheets and a dozen subscriptions with one tool shaped around how your team works.

    [ Workflows ] [ Roles ] [ Data ]

  3. 03

    Client portals and admin dashboards

    Accounts, permissions, dashboards and an admin panel to run the business.

    [ Auth ] [ Permissions ] [ Admin ]

  4. 04

    Subscription billing with Stripe

    Plans, trials, invoices, proration and failed-payment recovery, wired so revenue flows without manual work.

    [ Stripe ] [ Billing ] [ Dunning ]

  5. 05

    Marketplaces and platforms

    Two-sided products with onboarding, payouts and commissions.

    [ Matching ] [ Payouts ] [ Reviews ]

  6. 06

    APIs and integrations

    HubSpot, Salesforce, QuickBooks, Slack and your own services, connected through clean APIs and webhooks.

    [ REST API ] [ Webhooks ] [ Sync ]

  7. 07

    Performance and scale

    Database tuning, caching and background jobs so the product holds up when usage grows.

    [ Caching ] [ Queues ] [ Monitoring ]

  8. 08

    Product site and onboarding

    The marketing site for your product and the first-run experience that turns sign-ups into active users.

    [ Product site ] [ Sign-up ] [ Onboarding ]

[ What it lets you do ]

What changes,
in practice.

  • Sell online

    Plans, free trials and invoicesCards and ACH through StripeAutomatic failed-payment recovery

  • Serve customers

    A clean customer portalRoles and permissions per accountIn-app support

  • Run the business

    Real-time dashboardsAn admin panel for your teamExports to QuickBooks or Xero

  • Kill the spreadsheets

    Your workflow in one toolNo more double data entryA reliable audit trail

  • Connect your stack

    HubSpot, Salesforce, QuickBooksAPI and webhooksSSO with Google or Microsoft

  • Scale

    Multi-tenant from day onePerformance that holds as you growA public API for partners

[ How we work ]

Four steps,
in this order.

  1. 01Scope

    Goals, users, business model, and the smallest version worth launching.

  2. 02Design

    User flows, screens, architecture and stack.

  3. 03Build

    Staged releases you can use on a staging environment.

  4. 04Launch and grow

    Go live, measure, then build what real usage asks for.

[ Typical examples ]

What it
looks like.

Nothing changes for you. You just get time and money back.

Operations software that replaces spreadsheets

Every location runs schedules, orders and numbers in its own files.

  • Merging every location's spreadsheets[ by hand ]
  • Retyping orders[ by hand ]
  • Hunting for the latest schedule[ by hand ]

We plug into your tools.

  1. Shared workflows mapped with HQ
  2. Role-based software for locations and head office
  3. Consolidated dashboards

One source of truth across the network and no more double entry.

  • One tool across the network
  • Orders entered once
  • Live consolidated numbers

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back.

Time back

Hours of consolidation gone every week.

Money saved

Fewer order errors and fewer stacked subscriptions.

A subscription SaaS with a customer portal

A validated idea with early customers, and no technical co-founder to build it.

  • Invoicing customers by hand[ by hand ]
  • Managing access over email[ by hand ]
  • Tracking subscriptions in a spreadsheet[ by hand ]

We plug into your tools.

  1. MVP focused on the core workflow
  2. Stripe plans, trials and invoicing
  3. Admin panel to manage accounts

A live product that bills on its own and grows with real usage.

  • Automatic plans and invoices
  • A self-serve customer portal
  • A revenue dashboard

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back. [ Stripe ]

Time back

Billing runs on its own.

Money saved

Fewer failed payments thanks to automatic recovery.

A two-sided marketplace

Connecting customers and providers, with secure payments and a platform fee.

  • Matching customers and providers by phone[ by hand ]
  • Collecting, then paying out by hand[ by hand ]
  • Tracking fees in a spreadsheet[ by hand ]

We plug into your tools.

  1. Provider onboarding and verification
  2. Booking, payment and payouts
  3. Reviews and messaging

A platform that handles the whole transaction, from request to payout.

  • Online booking and payment
  • Automatic payouts
  • Fees calculated for you

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back. [ Stripe Connect ]

Time back

No more manual transaction work.

Money saved

Every transaction earns its fee, every time.

A delivery tracking tool

Deliveries are tracked over the phone and across several spreadsheets.

  • Calling drivers to check where they are[ by hand ]
  • Answering customers who are waiting[ by hand ]
  • Updating spreadsheets every evening[ by hand ]

We plug into your tools.

  1. Real-time route tracking
  2. Automatic customer notifications
  3. An operations dashboard

Every delivery tracked in one place, customers informed without a call.

  • Live position and status
  • Customers notified automatically
  • One dashboard

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back. [ Your ERP ]

Time back

No more check-in calls.

Money saved

Fewer missed deliveries.

A B2B training platform

Enrollment, payments and certificates are all handled over email.

  • Enrolling every learner by hand[ by hand ]
  • Sending invoices one by one[ by hand ]
  • Writing certificates[ by hand ]

We plug into your tools.

  1. Online catalog and enrollment
  2. Payment and corporate invoicing
  3. Certificates generated automatically

A platform that handles enrollment, payment and follow-up on its own.

  • Online enrollment
  • Automatic invoices
  • Generated certificates

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back.

Time back

Admin no longer eats the day.

Money saved

More full sessions without extra sales effort.

Scheduling software for a multi-provider practice

Each provider manages their calendar differently and bookings overlap.

  • Booking over the phone[ by hand ]
  • Calling patients the day before[ by hand ]
  • Fixing double bookings[ by hand ]

We plug into your tools.

  1. Shared calendar by provider and room
  2. Online booking and reminders
  3. Deposits collected online

One reliable calendar and fewer no-shows.

  • One shared calendar
  • Automatic reminders
  • Online booking

For you, nothing changes.

Same tools, same team, same habits. You simply get time and money back. [ Calendar ]

Time back

The front desk can breathe.

Money saved

Fewer empty slots.

[ What you get ]

What you
walk away with.

No vague promises: concrete items, handed over in your name, that you keep whatever happens.

  1. Deliverable 0101 / 05

    The code in a repository your company owns

  2. Deliverable 0202 / 05

    Staging and production environments

  3. Deliverable 0303 / 05

    Automated, repeatable deployments

  4. Deliverable 0404 / 05

    An admin panel to run the business

  5. Deliverable 0505 / 05

    Technical and product documentation

[ When to call us ]

Sound familiar?

  • 01

    You have a validated idea and no technical co-founder.

  • 02

    Your current software cannot keep up with growth.

  • 03

    Subscriptions and invoices are still handled by hand.

  • 04

    Your team juggles spreadsheets and ten SaaS tools.

If one of these sounds like you, it is exactly what we do.

[ Who it is for ]

  • Profile 01

    Founders

    You are launching a SaaS and want foundations that will not need a rewrite after your first customers.

  • Profile 02

    Growing companies

    Your processes deserve one custom tool instead of a stack of subscriptions.

  • Profile 03

    Software companies

    Your product works and now needs performance, new plans and integrations.

[ Technology ]

Next.js React Node.js Laravel PHP Python PostgreSQL MySQL Redis Stripe AWS Docker

We pick the technology for your project, never the other way round. And we work with the one you already have.

[ In short ]

SaaS development is the design and build of subscription software delivered over the web. It covers product scoping, architecture, user accounts and permissions, recurring billing (usually Stripe), an admin panel and integrations. Lunarion Labs builds and rescues SaaS products and custom business software from New York.

What are we talking about?

Business software replaces spreadsheets and stacked tools with one application built around your workflows. A SaaS goes further: it is sold to other companies, so it needs multi-tenant accounts, roles, subscription billing and room to scale from the first release. Most of the cost of a SaaS is decided by scope, not by the stack.

A successful SaaS is not a feature list. It is a stable product people understand, recurring billing that runs on its own, and a codebase that can grow without breaking. We scope the smallest version worth launching, ship it in stages you can use, and keep the foundations clean from the first commit.

When should you call us?

  • You have a validated idea and no technical co-founder.
  • Your current software cannot keep up with growth.
  • Subscriptions and invoices are still handled by hand.
  • Your team juggles spreadsheets and ten SaaS tools.

How does an engagement work?

  1. Scope. Goals, users, business model, and the smallest version worth launching.
  2. Design. User flows, screens, architecture and stack.
  3. Build. Staged releases you can use on a staging environment.
  4. Launch and grow. Go live, measure, then build what real usage asks for.

The starting point is always the same: the Lunarion audit, at a fixed price, which gives you a written, costed diagnosis. See our four-step approach.

SaaS & business software: what is included

What drives the cost?

Every project is costed after the audit, which has a fixed price. The main factors are:

  • The scope of the first release
  • The number of user roles and permission levels
  • Integrations (CRM, accounting, ERP, payments)
  • Security, compliance and scale requirements

Mistakes to avoid

  • Building every feature before the first paying user
  • Running subscriptions by hand instead of automating billing
  • Choosing a stack no other team can take over
  • Skipping the admin panel you need to run the business

Where do we work?

Lunarion Labs is a software lab based in New York that works fully remotely, in English and French. We work with companies in the US, France and Spain, including in these cities:

United States

New York, Los Angeles, Chicago, Houston, Dallas, Austin, Miami, San Francisco, Boston, Seattle.

France

Paris, Lyon, Marseille, Toulouse, Bordeaux, Lille, Nantes, Strasbourg, Nice, Montpellier.

Spain

Madrid, Barcelona, Valencia, Seville, Malaga, Bilbao.

Go further

[ Questions ]

Frequently
asked.

How much does it cost to build a SaaS product?

It depends on scope, roles, integrations and billing complexity. We start with a fixed-price audit or scoping phase and give you a costed plan before you commit.

How long does it take to build a SaaS MVP?

It depends on the scope you choose. We size the first version together and give you a timeline step by step, with usable releases along the way.

Should we build custom or buy off the shelf?

If an existing tool covers most of what you need, we will tell you. Custom pays off when your workflow is your competitive edge.

Who owns the code and the IP?

You do. The repository, the accounts and a full IP assignment are part of the contract.

Do you also build the product website?

Yes, when it supports a product: marketing site, sign-up and onboarding. We do not build stand-alone brochure sites.

[ Guides ]

Go
further.

All guides →
October 1, 2026 · 6 min read [ Project rescue ] [ SaaS ]How to switch software development companies without losing your code, data or appsSource code ownership, domain and hosting access, App Store and Google Play transfers: a step-by-step checklist to switch software development companies safely. October 1, 2026 · 4 min read [ Project rescue ] [ SaaS ]Software project rescue: rewrite vs refactor, and how to decideIs your software project failing? How to rescue it: the rewrite vs refactor decision, the strangler fig approach and six checks before you start over. October 1, 2026 · 4 min read [ SEO ]Website redesign SEO checklist: how to redesign without losing rankingsDoes a website redesign affect SEO? Yes, if rushed. Use this checklist: URL inventory, 301 redirects, metadata, staging, launch and monitoring.

[ Other solutions ]

Same lab,
other crafts.

01Software rescueWe fix and finish software others left behind.Discover →03Mobile appsiOS and Android apps, all the way through App Store approval.Discover →04AI & agentsAI agents that actually do the work.Discover →05AutomationBusywork runs on its own.Discover →06SEO & AI visibilityFound on Google. Cited by AI.Discover →

[ Lunarion audit ]

Shall we look at
your project?

A few questions, then a written diagnosis with priorities and costs. Then you decide.