Most software companies outgrow off-the-shelf tools before they reach their first hundred customers. Perimattic designs and builds enterprise-grade SaaS platforms from the ground up — multi-tenant architecture, subscription billing, cloud-native infrastructure, and the integrations your customers depend on.
SaaS Stack We Build On — Next.js, Node.js, PostgreSQL, Stripe, AWS, Kubernetes, and the wider modern SaaS ecosystem
SaaS platform development is the process of designing, engineering, and operating software delivered as a subscription service over the internet. A SaaS platform is not simply a web application — it is a system that must serve multiple independent customers simultaneously, manage subscription entitlements, enforce tenant data isolation, scale under unpredictable load, integrate with the systems customers already use, and evolve continuously as the market demands. Each of these requirements introduces architectural constraints that generic website builders and low-code tools are not designed to handle.
The challenge for most businesses building a SaaS product is not the technology itself — it is making the right architectural decisions before the wrong ones become expensive to reverse. Multi-tenancy models, data isolation strategies, subscription billing logic, and role-based access control patterns all need to be designed at the foundation stage. A SaaS platform built on the wrong data model or without proper tenant isolation will face a re-engineering project that costs more than the original build before it reaches enterprise customers.
Perimattic builds custom SaaS platforms from the ground up: multi-tenant architectures designed for your isolation requirements, subscription and billing infrastructure matched to your commercial model, cloud-native deployments built for the availability your customers expect, and third-party integrations engineered to be resilient, versioned, and maintainable. Every platform is designed for the operational realities of running a SaaS business — not just for launch day.
Architecture control
Fixed, opinionated structure with limited customisation
Architecture control
Purpose-built architecture designed for your product domain
Multi-tenancy model
One-size-fits-all isolation with no model flexibility
Multi-tenancy model
Designed to your isolation, compliance, and cost requirements
Integration depth
Restricted to the vendor's available connectors and APIs
Integration depth
Full integration with any system your customers use
Feature ownership
Vendor controls the product roadmap and release schedule
Feature ownership
You own every feature, release decision, and the full codebase
Scalability
Shared infrastructure limits and per-seat pricing penalties
Scalability
Engineered for your growth trajectory from the first sprint
The difference becomes critical when your first enterprise customer asks for tenant data isolation, SAML SSO, a dedicated audit trail, and a custom SLA. These are exactly the requirements that reveal whether a platform was built to scale or built to demo.
Eight specialist service lines covering the full SaaS platform lifecycle — from architecture consulting and MVP through multi-tenancy, marketplace, scaling, and white-label delivery.
A structured six-stage process from free scoping session to production launch and ongoing platform support.
We map your product vision, target customer profiles, core workflows, integration requirements, and technical constraints. This session is free, carries no obligation, and produces a clear scope before any build decisions are made.
We design the multi-tenancy model, data architecture, API surface, authentication and authorisation strategy, and cloud infrastructure plan — documenting every decision with trade-offs so your team understands what was chosen and why.
We build core platform functionality against your most critical workflows to produce a working system your team and early customers can validate — surfacing integration edge cases and product assumptions before the full build commitment.
We build the full platform: multi-tenant data layer, subscription and billing integration, role-based access control, third-party API integrations, admin tooling, and customer-facing features — to a production standard with automated test coverage.
We run end-to-end testing across tenant isolation scenarios, billing edge cases, integration failure modes, and load conditions. Security testing and compliance control verification are completed before any production release.
We deploy to production with CI/CD pipelines, infrastructure monitoring, alerting, and runbook documentation. We remain available during the launch period and offer ongoing engineering retainers for platform evolution and feature development.
We map your product vision, target customer profiles, core workflows, integration requirements, and technical constraints. This session is free, carries no obligation, and produces a clear scope before any build decisions are made.
We design the multi-tenancy model, data architecture, API surface, authentication and authorisation strategy, and cloud infrastructure plan — documenting every decision with trade-offs so your team understands what was chosen and why.
We build core platform functionality against your most critical workflows to produce a working system your team and early customers can validate — surfacing integration edge cases and product assumptions before the full build commitment.
We build the full platform: multi-tenant data layer, subscription and billing integration, role-based access control, third-party API integrations, admin tooling, and customer-facing features — to a production standard with automated test coverage.
We run end-to-end testing across tenant isolation scenarios, billing edge cases, integration failure modes, and load conditions. Security testing and compliance control verification are completed before any production release.
We deploy to production with CI/CD pipelines, infrastructure monitoring, alerting, and runbook documentation. We remain available during the launch period and offer ongoing engineering retainers for platform evolution and feature development.
Select an industry to see how we design and build SaaS platforms that solve real operational problems at scale.
SaaS platforms in financial services demand rigorous security, regulatory compliance, and integration depth with payment rails, banking APIs, and data providers.
SaaS platforms in financial services demand rigorous security, regulatory compliance, and integration depth with payment rails, banking APIs, and data providers.
SaaS platforms in healthcare require HIPAA-compliant architecture, role-based access, and careful integration with clinical systems and patient data sources.
HR SaaS platforms require fine-grained role-based permissions, payroll and HRIS integrations, and multi-country configuration for global enterprise customers.
Logistics SaaS platforms connect carriers, warehouse systems, and customer portals, requiring real-time data processing and integration with supply chain tooling.
Retail SaaS products must handle high-concurrency transactions, catalogue complexity, and integrations with major e-commerce platforms and payment providers.
Legal and compliance SaaS platforms require fine-grained access controls, document security, audit trail integrity, and regulatory workflow enforcement.
Perimattic's work resulted in stable production systems. The team was helpful, easily accessible, and communicative through email. Their professionalism was impressive.
Quality
4.5
Schedule
5.0
Cost
5.0
Willing to Refer
4.5
DevOps Managed Services · Oct 2023 – Aug 2024
24/7 monitoring and support for production environments plus Linux server administration for a leasing automation company.
The new architecture is scalable and highly efficient, saving a lot of money in fees. Perimattic provides high-quality IT consulting and cloud development work promptly and at great value. The team remains involved from the planning stage to providing support, showing diligence and proactiveness.
Quality
5.0
Schedule
5.0
Cost
4.5
Willing to Refer
5.0
AWS Migration (Legacy → Microservices) · Nov 2018 – Ongoing
Transitioned a travel systems company's legacy server system to an AWS-based microservices architecture with ongoing maintenance.
Four structural advantages that separate enterprise-grade SaaS engineering from prototype-quality builds that cannot scale.
Every SaaS platform we build starts with a documented architecture decision record covering multi-tenancy, data isolation, API design, and security. Getting these foundations right before the first line of product code eliminates the most expensive technical debt a SaaS company can accumulate.
We design tenant isolation at the database layer from the start. Retrofitting multi-tenancy into a single-tenant codebase is one of the most disruptive and expensive re-engineering projects a SaaS product can face. We make the right choice in week one so you never face it.
Our team covers the complete SaaS engineering stack: frontend, API, data layer, DevOps, billing integration, and cloud infrastructure. You get a single team responsible for every layer — from database schema to deployment pipeline — with no gaps and no hand-offs.
The engineers who design your SaaS architecture also build, test, and deploy it. You get continuity from scoping call to go-live, with no strategic advisory disconnected from the engineering reality of building and shipping your platform.
“Unlike agencies that build features without architectural context, or consultancies that advise without shipping, Perimattic brings both capabilities to every SaaS engagement — from scoping call to production and beyond.”
Custom SaaS platform development is the process of designing, engineering, and deploying a software-as-a-service application built specifically for your product vision, business model, and target customers. Unlike off-the-shelf SaaS tools, a custom platform is architected around your domain logic, your pricing model, your integration requirements, and your multi-tenancy strategy — giving you full ownership of the product and the flexibility to evolve it on your own terms.
Multi-tenant architecture means a single instance of your SaaS platform serves multiple customers, or tenants, while keeping their data and configuration isolated from each other. The three main models are shared database with row-level security, schema-per-tenant, and database-per-tenant. The right model depends on your security and compliance requirements, the data volumes involved, and the cost of isolation at scale. Getting this decision right at the architecture stage is critical — retrofitting multi-tenancy into a single-tenant codebase is one of the most expensive engineering mistakes a SaaS company can make.
A focused SaaS MVP covering a single core workflow typically takes six to ten weeks. A full production SaaS platform with multi-tenancy, billing integration, role-based access control, and third-party integrations typically takes twelve to twenty weeks depending on scope and integration complexity. Platforms with compliance requirements, complex data models, or extensive API surface area take longer. We provide a more accurate timeline after the free discovery and scoping session, once we understand the full product specification.
A SaaS MVP for a focused, well-scoped use case typically starts from around USD 20,000. A full production SaaS platform with multi-tenancy, subscription billing, IAM, DevOps infrastructure, and core integrations is typically USD 60,000 to USD 200,000 depending on scope, team size, and compliance requirements. Enterprise platforms with complex data architectures, white-labelling, or regulatory certification readiness vary based on the depth of work required. We scope every engagement before quoting so there are no surprises.
A SaaS MVP is a production-quality but deliberately scoped build that validates your core value proposition with real customers. It covers one or two primary workflows, basic multi-tenancy, essential authentication, and enough integration to demonstrate value. A full production platform adds robust billing and subscription management, comprehensive role-based access control, deeper third-party integrations, admin tooling, reporting and analytics, audit logging, and the infrastructure hardening needed for enterprise customers and SLA commitments. We scope MVP and full platform engagements separately so you can validate before committing to the full build.
We treat security as an architectural property, not a post-launch checklist. For every SaaS platform we build, we implement tenant data isolation at the database layer, role-based access control enforced at the API layer, encryption at rest and in transit, structured audit logging, and dependency vulnerability scanning in CI/CD. For platforms with SOC 2, HIPAA, or GDPR requirements, we design the controls framework from the start and document the evidence chain needed for audit. We also conduct threat modelling during the architecture phase to identify and address risks before they enter the codebase.
Yes. We implement subscription billing using Stripe, Chargebee, and Paddle depending on your commercial model and geographic requirements. We handle trial management, seat-based and usage-based pricing, billing intervals, proration, upgrade and downgrade flows, invoice generation, dunning logic, and revenue recognition requirements. We also connect billing events to your product entitlement layer so that subscription changes are reflected immediately in feature access without manual intervention.
We build cloud-natively on AWS, Azure, and GCP — the choice depends on your existing infrastructure, compliance requirements, and cost modelling. For most new SaaS platforms, we containerise workloads with Docker, orchestrate with Kubernetes or managed container services, manage infrastructure with Terraform, and configure CI/CD pipelines with GitHub Actions or similar. We design for high availability from the start: multi-AZ deployments, auto-scaling policies, database replication, and zero-downtime deployment strategies are standard, not optional.
Yes. SaaS application modernisation is one of the more complex engagements we undertake. It involves decomposing a monolithic or single-tenant system into a multi-tenant architecture while keeping the existing product operational throughout the migration. We assess the existing codebase for modularity, design the target SaaS architecture, implement tenant isolation incrementally, migrate data safely, and introduce DevOps and CI/CD practices that bring the platform up to a standard where it can be sold and operated as a commercial SaaS product.
We have delivered SaaS platforms for clients in financial services, healthcare and MedTech, human resources, logistics and supply chain, e-commerce and retail, and legal and compliance technology. Our architecture and security patterns are designed to meet the data sensitivity, compliance, and integration requirements common in these sectors. We can discuss your specific regulatory and technical requirements on the free scoping call.
Tell us what you are building, who you are building it for, and where you are in the process. We will show you exactly how a purpose-built SaaS architecture can reduce your time to market, lower your infrastructure cost at scale, and give your sales team a platform they can confidently sell to enterprise customers.