Engineering Foundations of a Resilient SaaS Platform
A SaaS business needs a good interface, and also an architecture that can grow with the number of users without an expensive rewrite.
Multi-Tenant Data Isolation
Strict tenant partitioning via PostgreSQL row-level security and schema isolation, for strong data confidentiality between your business customers.
Automated Stripe Subscriptions
Complete billing orchestration: recurring subscriptions, custom tiers, prorated upgrades, self-service portals, and fault-tolerant webhook processing.
Enterprise Auth & RBAC
Granular Role-Based Access Control, Single Sign-On (SSO / OAuth2), cryptographic JWT authentication, session revocation, and security audit logs.
European Cloud & GDPR
Hosted in certified European data centers (Hetzner, OVH, AWS Frankfurt), with cookie-consent management, encryption at rest and in transit, and data-deletion audits.
From Blueprint to Launch: The MVP Roadmap
A disciplined, fixed-scope engineering approach to validate your market while mitigating financial and operational risks.
Scope & Architecture
Isolating non-negotiable core features, database schema design, and interactive UX wireframes.
Backend & UI Build
Implementing FastAPI/Spring Boot APIs, dynamic React dashboards, auth flows, and integration readiness for production AI & LLM capabilities.
Billing, Tests & GDPR
Stripe integration, automated end-to-end integration tests, data sovereignty checks, and privacy audits.
Deployment & Handover
Production deployment with monitoring and a rollback plan, complete Git repository transfer, and IP ownership handover as set out in the contract.
Kalendarius: Privacy-First Appointment Scheduling SaaS
Designed and built as a scheduling product with calendar synchronization (Google and Outlook), an availability engine in FastAPI and React, and seven-language localization. If you have an existing codebase with latency or architectural concerns, see our software architecture consulting and code audits.
Kalendarius scheduling software ↗Choosing the API stack for a focused product? Explore our Python and FastAPI backend development service, including baseline memory, hosting tradeoffs and a balanced Spring Boot comparison.
Frequently Asked Questions on B2B SaaS & MVP Engineering
How long does it take to build and launch a production-ready B2B SaaS MVP? ▾
A focused, well-scoped MVP (multi-tenant architecture, RBAC authentication, interactive dashboard, and Stripe recurring billing) is planned in milestones agreed after scoping. The timeline depends on features, integrations and data, and is set out before development starts.
What technology stack do you use for SaaS MVP development? ▾
We use proven, widely adopted technologies: APIs built with Python FastAPI, Node.js, or Spring Boot 3; responsive frontends in React, TypeScript, or Astro; and PostgreSQL with Row-Level Security (RLS) for tenant data isolation. Deployments use Docker on privacy-first European cloud infrastructure (Hetzner Germany/Finland or AWS Frankfurt).
Can you integrate AI or LLMs into our SaaS product? ▾
Yes. We integrate production AI capabilities (OpenAI, Anthropic Claude, Gemini) including real-time token streaming, semantic caching via Redis to reduce API costs on repeated or similar requests, and automated workflows.
How do you handle multi-tenant data isolation and GDPR compliance? ▾
Tenant isolation is architected using PostgreSQL Row-Level Security (RLS) or dedicated tenant schemas for strict tenant isolation at the database layer. Cloud hosting is localized within certified EU data centers with TLS encryption and no unwarranted third-party tracking.
Who owns the source code and cloud infrastructure for the SaaS product? ▾
Ownership of the source code, database schema, Docker configuration and cloud accounts is set out in the project contract.
How does the engagement and collaboration model work? ▾
You work directly with the developer who designs and writes the code, without account managers or agency overhead. We work in structured sprints with weekly staging demo deployments, clear milestone deliverables, and transparent communication.
Let's discuss your project
Tell us what you want to build or improve: a business web app, customer portal, booking system or another business application. Kineto Soft will reply with an initial view of scope, price and timing in writing, usually within 48 hours.