Engineering Foundations of a Resilient SaaS Platform
Building a viable SaaS business requires more than just frontend UI. It demands a robust architectural foundation capable of scaling to thousands of enterprise users without costly rewrites.
Multi-Tenant Data Isolation
Strict tenant partitioning via PostgreSQL row-level security and schema isolation, ensuring airtight data confidentiality across 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.
GDPR-Native & European Cloud
Hosted in certified European data centers (Hetzner, OVH, AWS Frankfurt) with zero third-party telemetry, end-to-end encryption, and full compliance tooling.
From Blueprint to Launch: The 6–8 Week 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 core business rules.
Billing, Tests & GDPR
Stripe integration, automated end-to-end integration tests, data sovereignty checks, and privacy audits.
Deployment & Handover
Zero-downtime production deployment, complete Git repository transfer, and 100% IP ownership handover.
Kalendarius — Privacy-First Appointment Scheduling SaaS
Architected and engineered from scratch as an EU-hosted, GDPR-compliant alternative to Calendly. Features bi-directional calendar synchronization (Google & Outlook), real-time availability compute engine in FastAPI/React, 6-language localization, and 100% European data sovereignty.
Explore Kalendarius ↗Let's discuss your project
Tell us what you're building - a secure microservice, a custom AI chatbot, or a high-performance enterprise application. You'll get a scope, a price, and a timeline. In writing, within 48 hours.