We architect, build, and scale multi-tenant SaaS platforms from the ground up. We know the full lifecycle because we built and run our own.
Discuss your SaaS projectMisterios is a UK-based SaaS development company that builds custom SaaS platforms from scratch. Not modified templates. Not low-code prototypes. Production-grade, multi-tenant software-as-a-service products designed to serve thousands of customers from day one.
We handle the full scope of SaaS platform development: system architecture, core product engineering, cloud infrastructure, subscription billing integration, and post-launch scaling. Every platform we build is designed around your specific business model, whether that is per-seat pricing, usage-based billing, freemium tiers, or enterprise contracts.
Our clients come to us when off-the-shelf tools cannot solve their problem and they need a custom SaaS platform that gives them full control over the product, the data, and the customer experience. We turn that vision into production software that handles real traffic, real payments, and real users at scale.
Shared infrastructure with logically isolated data per tenant. Each customer operates in their own workspace with tenant-scoped queries, row-level security, and configurable feature flags per account.
Stripe integration with support for recurring subscriptions, usage-based pricing, plan upgrades and downgrades, prorations, invoicing, tax calculation, and self-service plan management for customers.
Role-based access control with granular permissions, team invitations via email, user roles (admin, member, viewer), activity logs, and configurable permission policies per workspace.
Collaborative workspaces where teams manage projects, share resources, and control access. Support for multiple workspaces per account, workspace-level settings, and cross-team visibility controls.
Built-in usage tracking and analytics dashboards for both platform operators and end customers. Monitor API calls, storage consumption, active users, and feature adoption in real time.
RESTful and GraphQL APIs with API key management, rate limiting, versioning, and comprehensive documentation. Allow your customers to integrate your platform into their own workflows programmatically.
Every SaaS platform needs robust internal tooling. We build admin dashboards that give operators full control over the product and its users, not as an afterthought, but as a core part of the platform from the start.
A SaaS platform is only as reliable as the infrastructure it runs on. We engineer every deployment pipeline, scaling policy, and failover strategy before your first customer signs up. Our infrastructure work includes:
BabelKit is the most advanced enterprise localisation platform on the market, and we built every line of it. It is a fully multi-tenant SaaS product serving production customers who manage millions of translation strings across 200+ languages and 26+ file formats.
The platform integrates 30+ AI-powered translation engines, supports over-the-air updates via native SDKs for iOS, Android, Flutter, and React Native, and connects directly with GitHub, GitLab, and Bitbucket for automated string synchronisation on every push.
BabelKit implements the same SaaS patterns we build for clients: multi-tenancy with isolated workspaces, role-based access control for developers, translators, reviewers, and project managers, subscription billing, usage analytics, audit trails with version history, and a customer-facing API with key management and rate limiting.
The tech stack: React, Node.js, GraphQL, PostgreSQL, Redis, and AWS. CI/CD through GitHub Actions, containerised with Docker, monitored with real-time dashboards. This is not a demo project or a case study on paper. BabelKit serves enterprise clients in production every day, and we maintain, scale, and improve it continuously.
Most development agencies build SaaS features for clients. We built and operate our own SaaS product, BabelKit, in production. That distinction changes everything about how we approach your project.
We understand the full lifecycle of running a SaaS business, not just the engineering. We have dealt first-hand with pricing model experiments, churn reduction strategies, onboarding UX optimisation, infrastructure cost control, customer support tooling, and the painful reality of scaling a product from early adopters to enterprise contracts. That operational experience shapes every architectural decision we make for our clients.
When we design your subscription billing integration, it is informed by real-world experience handling plan changes, failed payments, dunning flows, and tax compliance. When we build your admin dashboard, it is informed by the tools we wish we had built sooner for ourselves. When we architect your multi-tenant data model, it is informed by every performance bottleneck we have already encountered and solved in our own platform.
We do not treat SaaS development as a feature checklist. We treat it as a product discipline, because we live that discipline every day.
We work with a modern, production-proven stack optimised for SaaS workloads. Every technology choice is driven by reliability, developer velocity, and long-term maintainability.
Our platforms handle millions of API calls in production, serve enterprise clients with strict uptime requirements, and power our own SaaS product, BabelKit, which operates at scale every day. We do not recommend technologies we have not shipped to production ourselves.
Tell us about your product vision. We will scope the architecture, define the tech stack, and give you a clear path to launch.
Get in touch or email us directly at [email protected]