Fantasktic

About the project

Fantasktic is a production multi-tenant B2B SaaS platform developed at Stupendastic Films. With 307 of 1,033 commits in a 6-developer team, I worked on the main PostgreSQL data model (~150 tables), cross-domain authentication, and Docker-based delivery. I also built HR, geolocation, and AI automations for email and calendar workflows.

Technologies

Features

• 307 of 1,033 commits in a 6-developer team · production platform
• Multi-tenant architecture with subdomains, cross-domain OAuth and secure cookies
• Virtualized canvas with thousands of items, sticky headers and requestAnimationFrame
• Google Calendar Sync: dual OAuth, multi-column DATE sync, rate limiting
• Complete Time Clock system: calendar, geolocation, breaks, visual timeline
• HR Module: interactive org chart, Gantt absence calendar, digital signatures
• Real-time chat, SSE notifications with Redis pub/sub, automations
• Expense system with mobile capture, PDF/image viewer and recurring entries
• Junior developer mentoring in project patterns and code review

Technical challenges

• Designing secure multi-tenant architecture with ~150 PostgreSQL tables
• Resolving complex NextAuth issues in production (JWT, cross-domain cookies)
• Performance optimization in virtualized tables with thousands of items
• Implementing bidirectional Google Calendar sync with duplicate detection
• Race conditions in bulk creation and infinite re-render loops
• CI/CD with multi-stage Docker, pnpm 9-10 migration, env variables in builds

Learnings

• Large-scale multi-tenant architecture in production
• Advanced security: RLS, HR field encryption, timing-safe comparisons
• Real-time systems with SSE and Redis pub/sub
• Technical leadership and mentoring in development team
• Self-hosted infrastructure: multi-stage Docker, Coolify, 36 cron jobs

Screenshots

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