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YYefrixLab

Portfolio

Systems that shipped.

Every case study here describes software that is deployed and doing its job right now. Filter by what you are trying to build.

Fintech2026

LedgerFlow: personal finance platform

Multi-tenant budgeting and forecasting platform with bank statement ingestion and AI-powered transaction categorization.

  • FastAPI
  • React
  • PostgreSQL
  • Redis
  • +3
AI & Automation2026

Smart AI Gateway: one API, six providers

OpenAI-compatible LLM gateway with automatic failover across six providers, per-route model tiering and full observability.

  • Python
  • nginx
  • Docker
  • Prometheus
  • +4
AI & Automation2026

Taxonaut: accounting automation for Polish sole traders

Self-hosted auto-accountant for Polish JDG: invoices in, tax declarations out, with rules-as-data and tiered LLM processing.

  • FastAPI
  • PostgreSQL
  • Redis
  • Celery
  • +3
SaaS & Platforms2026

VaultBox: self-hosted file platform

A Google-Drive-class file platform on your own hardware: uploads, previews, sharing, full-text search, zero subscription.

  • FastAPI
  • React
  • PostgreSQL
  • rclone
  • +2
SaaS & Platforms2026

AtlasWiki: multi-tenant knowledge base

A fast, self-hosted wiki with a rich collaborative editor, strict tenant isolation in the database, and file attachments served by a sibling platform.

  • FastAPI
  • React
  • TipTap
  • PostgreSQL RLS
  • +1
Bots & Integrations2026

FlatScout: real-estate market watcher

A 7-container pipeline that watches a property marketplace around the clock, triages new listings, and pings a Telegram bot before other buyers wake up.

  • Python
  • Celery
  • PostgreSQL
  • Redis
  • +3
AI & Automation2026

PocketOps: an AI server operator in your pocket

A mobile-first AI assistant that operates real infrastructure: it reads logs, restarts services, deploys apps and reports back, from a phone.

  • Claude Code (headless)
  • FastAPI
  • React
  • Docker
  • +1
Games & Simulation2026

FableCity: a city simulation that thinks in millions

A Cities-Skylines-class city builder in Godot 4 whose aggregate simulation model handles a 3,000,000-population city on desktop hardware.

  • Godot 4
  • GDScript
  • Aggregate simulation
  • Automated test gates
Infrastructure & DevOps2026

Bastion: a hardened self-hosted app fleet

One mini PC running a production fleet: reverse proxy, automatic TLS, 2FA gateway, monitoring, alerting, backups and a dozen apps, at 99.9% uptime.

  • Docker
  • Traefik
  • Let's Encrypt
  • fail2ban
  • +4

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