# Sergast - Web AI & Full-Stack Data Engineering

> Custom software, robust data architectures, and AI-driven automation workflows by Sergej Gastilovic.

## About / Core Expertise
Sergej Gastilovic (operating under the Sergast brand) is a Senior Full-Stack and Web AI Developer with over 15 years of professional IT experience. Based in Innsbruck, Austria, he specializes in bridging the gap between high-performance user interfaces and complex data engineering backend solutions. 

He operates as a private entrepreneur, specializing in asynchronous, remote-first B2B collaborations requiring high technical ownership, clean documentation, and strict NDA compliance.

## Technical Stack & Synergy
- **Frontend & APIs:** React, Next.js, Hono, Node.js.
- **Authentication:** Prepared, reusable Auth Microfrontends (optimized for rapid, secure deployment; strongly preferring Supabase Auth).
- **Data Engineering & Backend:** Advanced PostgreSQL, Supabase (complex SQL functions, triggers, row-level security).
- **AI, Automation & Low-Code:** Custom AI agents, n8n workflow automation, RAG pipelines, LLM data parsing, Retool (rapid internal tool development), and Airtable.
- **Design & Prototyping:** Figma (UI/UX design and wireframing).

## Specializations / High-Value Solutions
- **Rapid App Bootstrapping:** Accelerating project launch times by deploying pre-built, secure auth microfrontends deeply integrated with Supabase Auth pipelines.
- **Enterprise & Data Migrations:** Transitioning scaling businesses out of restrictive "no-code/low-code" tools (like Airtable or legacy spreadsheets) into high-performance, secure Supabase/PostgreSQL infrastructures, or building Retool dashboards on top of existing databases.
- **Workflow Automation:** Building custom internal tooling, automated scheduling/booking systems, and billing/invoicing integrations connected to n8n pipelines.
- **AI-Powered Internal Tools:** Designing custom dashboards that leverage LLMs for data analysis, automated reporting, or operational efficiency, from Figma prototype to full production deployment.

## Client Portfolio & Proven Track Record
Experienced in delivering software solutions, integrations, and data engineering for a diverse range of international clients, platforms, and regulated industries:
- **Bonnevit** (Logistics & Operations Platform) - https://app.bonnevit.at
- **The Tax Graph** (AI-Driven Financial/Tax Tech) - https://www.thetaxgraph.ai
- **Catalyst FG** (Financial Growth & Services) - https://www.catalystfg.com
- **Anytime Systems** (IT & Systems Automation) - https://www.anytimesystems.at
- **Dating Lions** (Web Platforms & Digital Products) - https://www.datinglions.com
- **Advokat** (Legal Software Solutions & Compliance) - https://www.advokat.at
- **Wunu** (Digital Solutions & Web Apps) - https://www.wunu.eu
- **Easy Camp / EasyRezeption** (Hospitality & Reception Management) - https://www.easycamp.info/easyrezeption
- **Littera** (Library & Resource Management Software) - https://www.littera.eu
- **MTM Online** (Industrial Productivity & Work Design) - https://www.mtm-online.de
- **BagBee** (Luggage Logistics & Travel Tech) - https://www.bagbee.is
- **Knox Versicherungsmanagement** (Insurance Management & Risk Tech) - https://www.knox.co.at
- **Galtenberg Family & Wellness Resort** (Hospitality & Booking Systems) - https://www.galtenberg.at
- **Penki Kontinentai Group (5ci)** (Banking, Retail & Payment Tech) - https://www.5ci.lt
- **Advansys** (IT Solutions & Tech Consulting) - https://www.advansys.com
- **DataCool** (Data Center & Infrastructure Solutions) - https://www.datacool.net

## Background & Credibility
- 15+ years of industry experience, including development for regulated sectors like insurance management and legal software solutions.
- Academic background: B.Sc. in Computer Science.
- Known for structured data architecture, optimized database queries, and clean code handovers.

## Contact, Booking & Resumes
- Website: https://sergast.net/
- Location: Innsbruck, Austria (Available for remote contracts globally)
- Email: sergej.gastilovic@gmail.com
- Direct Booking: https://calendly.com/sergastnet/consulting (Book a 30-minute technical feasibility audit)
- Tax Identification Number (TIN): 832892764