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SaaS & custom builds

From first prototype to a scalable SaaS product

We build subscription software, secure client and partner portals, and the APIs that connect the systems your business already uses - scoped clearly, delivered in stages and supported after launch.

At a glance

  • SaaS, portals & APIsProducts, log-in areas and system integrations
  • Fixed-scope phasesLaunch a first version, then grow it with real users
  • USD · GBP · EUR · INRQuoted and invoiced in your currency

SaaS, portals & integrations

When your requirement does not fit a category

Some ideas are a product in their own right: a subscription tool for your industry, a portal for your customers, or a bridge between systems that were never meant to talk. We scope it properly, build a first version that real users can try, and grow it from there.

What we build

  • Multi-tenant SaaS products with user accounts and plans
  • Subscription billing, invoices and usage limits
  • Admin consoles to manage customers, plans and content
  • Client and partner portals with secure log-in
  • Document sharing, requests and status tracking
  • REST APIs for your apps and partners
  • Integrations with payment gateways, email, SMS and WhatsApp
  • Connections to accounting, ERP and CRM systems

Why OASIS

Our team has 15+ years of experience building and supporting business platforms that run in production for clients in the UK, the EU, the USA and Asia. We keep the first release focused, so you reach users sooner, and we stay on to scale and support the product.

Discuss a product

What we build

Products, portals and connections

SaaS & product development

Subscription products with user accounts, plans, billing and admin control - from first prototype to a scalable, multi-user platform.

Client & partner portals

Secure log-in areas where customers, dealers or partners submit requests, track status, download documents and see their own data.

APIs & integrations

Connect the systems your business already uses, with REST APIs, webhooks and scheduled data sync.

Admin & analytics

Dashboards for usage, revenue, customers and support, built into the product.

Security & roles

Role-based permissions, audit logs and secure authentication for every user type.

International-ready

Multiple languages, currencies and time zones for users in different countries.

How we build

From idea to a product people use

We define the smallest version worth launching, prototype it with you, then build, launch and improve it in stages.

  • PHP (custom MVC)
  • MySQL
  • REST APIs
  • JavaScript
  • Bootstrap 5
  • Payment gateways
  • WhatsApp Business API
  1. 01

    Discovery & data model

    We map your workflows, users and data sources, then agree scope, milestones and a fixed quote.

  2. 02

    Clickable prototype

    You see the screens and user journeys before development starts - and shape them while changes are cheap.

  3. 03

    Build in sprints

    Working modules on a staging server every sprint, with data migration and integrations tested along the way.

  4. 04

    Go-live, training & AMC

    Deployment, user training and an annual maintenance contract that keeps the system secure, backed up and evolving.

Questions

SaaS & integration FAQ

Can you build an MVP first?

Yes. We recommend launching a focused first version with the features users need most, then adding to it based on real feedback.

Do you handle subscription billing?

Yes. We build plans, subscriptions, invoices and usage limits, and integrate the payment gateway that suits your market.

Can you integrate with our existing software?

In most cases, yes. If the other system has an API, we connect to it; if not, we look at exports, file transfers or database-level integration.

Who owns the product and code?

You do. Once paid, the source code and all data belong to you.

What happens after launch?

We offer AMC plans for hosting support, security updates, monitoring and new features as your product grows.

Tell us about your SaaS project

Only name, email and phone are required - the rest helps us reply with useful detail.

Where is your product today?

What do you need from us?

Tick all that apply

What happens next

  1. 1 A real person - not a bot - reads your message.
  2. 2 We reply within one business day with honest, helpful next steps.
  3. 3 If it's a fit, we set up a relaxed discovery call. If it's not, we'll happily point you in the right direction.

No spam, ever. We'll only use your details to respond to your enquiry.

Build your product properly

Tell us about your idea.

Describe your users, the problem your product solves and the systems it must connect to. We will come back with questions and a phased, fixed quote.

Discuss your product

info@oasis.ind.in · Working with clients in the UK, EU, USA and Asia