SaaS development UK.
Built to scale from day one.
Mantar Tech builds SaaS products for UK startups and businesses — multi-tenant architecture, subscription billing, admin dashboards and scalable cloud infrastructure. Fixed price. Full code ownership. Free consultation.
SaaS products we build.
B2B SaaS Platforms
Multi-tenant platforms where each business customer (tenant) has their own isolated workspace, users, data and customisation. The most common SaaS model.
Subscription Billing
Stripe integration for monthly/annual plans, usage-based billing, free trials, coupons and a self-serve customer billing portal. Supports complex pricing models.
Multi-Role Admin
Super-admin, workspace admin, team member and viewer roles. Permissions system tailored to your product's access model. Audit logs included.
Analytics Dashboards
Real-time metrics, charts and reports built into your SaaS product. Gives users the data they need inside your platform, not exported to spreadsheets.
API & Integrations
Public REST API for your SaaS product. Webhooks for third-party event delivery. Native integrations with CRMs, accounting tools, Zapier, Slack and more.
Scalable Infrastructure
Cloud-native architecture on AWS or GCP. Auto-scaling, containerised deployments, staging/production environments, monitoring from day one.
Our SaaS tech stack.
Frontend
React or Next.js with TypeScript. Component library (Radix or shadcn). Responsive design, dark mode support, fast page loads. Hosted on Vercel or CDN.
Backend
Node.js (Express / Fastify) or Python (FastAPI). PostgreSQL with row-level security for tenant isolation. Redis for caching and queues. REST or GraphQL API.
Infrastructure
AWS (ECS, RDS, S3, CloudFront) or GCP. Docker and Kubernetes for orchestration. GitHub Actions CI/CD. Datadog or Sentry for monitoring.
SaaS development pricing.
SaaS MVP
£15,000–£30,000
Core features, multi-tenancy, Stripe billing, basic admin dashboard. 10–14 weeks. Enough to launch, charge and get real users.
Full-Featured SaaS
£30,000–£60,000
Full feature set, complex permissions, public API, analytics, third-party integrations, onboarding flows. 4–6 months.
Enterprise SaaS
£60,000+
SSO/SAML, compliance (SOC 2, GDPR), custom reporting, white-labelling, SLA infrastructure. Scoped after discovery.
SaaS development questions.
How much does SaaS development cost in the UK?
A SaaS MVP costs £15,000–£30,000. A full-featured SaaS platform costs £30,000–£60,000. Enterprise SaaS from £60,000. All projects are fixed-price.
What is multi-tenant architecture?
Multiple customers share one application instance with fully isolated data. It's the standard model for B2B SaaS — far more cost-effective than running separate instances per customer.
How do you handle data isolation between tenants?
We use PostgreSQL Row-Level Security (RLS) or schema-per-tenant depending on compliance requirements. Data isolation is enforced at the database level, not just application layer.
Can you build a SaaS with a public API?
Yes. We design and document REST or GraphQL APIs that your customers can use to integrate with your SaaS. API key management, rate limiting and versioning included.
Do I need GDPR compliance for a UK SaaS?
Yes, if you process personal data of UK or EU residents, UK GDPR applies. We build with GDPR in mind — data retention controls, right-to-erasure endpoints, consent management and audit logs.
Should I build custom or use existing SaaS infrastructure?
See our Custom Software vs SaaS guide for a detailed breakdown. For most founders building a product to sell, custom SaaS development is the right path.
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