StanislavShtelmakh
Next.js · TypeScript · Python. Production SaaS, self-hosted on Linux. The stack is not a checklist — it is one product surface, refracted from interface to ops.
Sezon Mail — AI Email Agent in Telegram
Email That
Triages Itself
LLM-judged email triage for a B2B client: model-decided importance with a deterministic safety net, and a feedback loop that changes behavior without a code deploy.
→ production
triage rules
one Prisma schema
Single-tenant by design — one inbox, one owner. Scoped deliberately small instead of building multi-tenant infrastructure nobody asked for yet.
Taught, Not Deployed
Inline feedback and plain-language rules persist to Postgres and change future triage — zero code deploys.
Invoice #2214 — payment due Friday
Write Before Triage
Every inbound path verifies its signature synchronously and persists before any slow work. A model failure can never lose a message.
Contracts That Can't Drift
The bot ↔ AI-service wire format is mirrored on both sides — it can't change without both languages visibly changing together.
Split-Host Production
Architecture Notes
Model-judged triage, the deterministic safety net, and two production failures diagnosed to root cause in the first week.
Next.js + Fastify SaaS — Multi-Channel Chat Widget
Next.js + Fastify SaaS
— Multi-Channel Chat Widget
$39 Lifetime License. Self-hosted WhatsApp, Telegram & Viber widget micro-product with Stripe payments and domain-bound keys.
The $39 Micro-SaaS
Most widgets charge $29/mo and inject trackers. PingBoost is self-hosted, domain-bound, and requires a single one-time payment.
SaaS vs Self-Hosted
System Specs
Zero-Touch Automation Loop
System Infrastructure
| Module | Key Capability |
|---|---|
| Embeddable Widget | Multi-channel fail-silent payload |
| License Server | Idempotent Stripe webhooks |
| Marketing Landing | Static export via Nginx |
| Visual Editor | Zero-touch configuration |
Bulk Price Updates in 2 Minutes
Bulk Price Updates
in 2 Minutes
Browser-Based Tool for E-commerce
Processed locally in < 2s.
Business data never leaves the browser.
Hierarchical Rules
Auto-Detect
Algorithms map columns across formats automatically.
Zero-Backend Export
Format-preserving export entirely in the browser. 50+ columns kept intact.
Architecture Docs
Deep dive into the core browser-based processing engine logic.
Linux Homelab Stack
Linux Homelab
Infrastructure Stack
Production-Ready Self-Hosted Infrastructure
SaaS List (V3)
Clean badges and modern typography.
Traefik Reverse Proxy
Seamless routing with automatic SSL provisioning. All internal ports stay hidden.
Architecture Docs
Explore the complete infrastructure as code and full setup documentation.
Network Architecture
Real-time visualization of the homelab network topology
System Architecture
Research & Development
System Architecture
Advanced configuration and terminal environment
Enterprise Security
Hierarchical OUs and strict group delegation.
Group Policy (GPO)
Automated endpoint configuration for seamless user experience.
Architecture Docs
Explore the complete Active Directory setup documentation.
Directory Graph
corp.local structure