>_ Full-Stack Developer Backend-focused

{ NUDRAK }

Donovan Agustín Alvarez

Arch · zsh · ~/Full-Stack

Python | FastAPI | PostgreSQL | React | TypeScript | Docker

Projects Contact CV-ES CV-EN

About

Full-Stack · Backend-focused · Arch Linux (rolling release) · Spanish · Technical English

What I am

Full-Stack Developer with a backend focus. I build complete applications — from the API and the data layer to the frontend that consumes them.

What I build

Web applications and REST APIs: authentication and access control (RBAC), payments and webhooks, integrations with external services, business automation, administrative systems, AI/RAG services, and frontends connected to those backends.

How they are engineered

Modular architectures with clear separation between transport, business logic and data access. I prioritize maintainability, explicit validation, traceability, predictable error handling and controlled behavior when external services fail — systems designed to grow in an orderly way.

How I work

  1. Analysis
  2. Planning
  3. Implementation
  4. Validation
  5. Testing
  6. Review

Every solution goes through the same cycle before, during and after implementation.

Learning

Structured self-taught learning: I analyze existing systems and reverse-engineer their patterns, architecture and design decisions, then validate them through my own projects.

Full Stack Open University of Helsinki · 5 ECTS · July 2026

architecture.py modular

Skills

Technical stack focused on backend engineering, frontend integration and infrastructure.

~/nudrak/stack.diagram active

Projects

Featured

POST /api/v1/checkout # full-stack

CyberWare

Full-stack e-commerce platform: catalog, search, cart, orders, inventory and a separate admin console. Cookie-based JWT auth with refresh tokens and RBAC, Stripe payments with signed webhooks and refunds, AWS S3, transactional emails via Resend, and Gemini-powered semantic search and chatbot. Reproducible local environment with Docker Compose and Alembic.

React TypeScript FastAPI PostgreSQL Redis Docker Compose
GitHub
GET /reports/event/{event_id}

Business Automation Agent

Event-driven backend that ingests Stripe webhooks, analyzes them with Google Gemini and a Rule Engine, and executes automated actions: PDF generation, S3 upload, and email delivery via Resend. Built with FastAPI, Celery, PostgreSQL, and Redis.

FastAPI PostgreSQL Redis Celery Gemini Stripe
GitHub
GET /api/v1/tasks?team= # RBAC

Task Manager API

Backend system for multi-team task management with JWT authentication and a hierarchical RBAC from viewer to owner. Layered architecture (routers, services, repositories), soft delete, entity auditing, pagination, filters, health checks, readiness probes and CI with GitHub Actions.

FastAPI PostgreSQL SQLAlchemy Alembic Docker GitHub Actions
GitHub

Other projects

POST /api/v1/rag/query # RAG

E-Commerce API RAG

Production-oriented e-commerce REST API featuring JWT authentication, Redis caching, PostgreSQL, pgvector semantic search, and Gemini-powered RAG. A well-structured, fully tested API with semantic product search via Retrieval-Augmented Generation.

FastAPI PostgreSQL Redis pgvector Gemini RAG
GitHub
GET /portfolios # JWT

FinTrader Hub

FinTrader Hub is a modular fintech backend built with FastAPI, PostgreSQL, Redis, Celery, and SQLAlchemy. It provides portfolio management, trade tracking, market data synchronization, risk analytics, automated alerts, JWT authentication, background workers, and Docker-based deployment.

FastAPI PostgreSQL Redis Celery Docker SQLAlchemy
GitHub
POST /api/v1/query # RAG

RAG Core Service

Retrieval-Augmented Generation service with embeddings pipeline, LLM integration via OpenRouter and semantic retrieval of contextual information.

FastAPI OpenRouter API SQLite Pydantic
GitHub
POST /api/v1/orders # JWT

E-Commerce API

Full e-commerce backend ready for frontend integration. Product, user and order management with JWT authentication, cart, stock control and admin panel.

FastAPI PostgreSQL Redis SQLAlchemy Docker
GitHub
GET /notes/shared # live · arch

Notes API

Notes API with session authentication, shared notes between users and basic permission system. Deployed to production.

Flask SQLite SQLAlchemy
GitHub Demo

Contact

Available for backend employment and projects

$ mail -s "Hello" Email Nudrak@protonmail.com $ git remote -v GitHub github.com/Donovan-Nudrak $ open linkedin LinkedIn donovan-a-83b7ba3a2 $ cat CV-ES.pdf CV-ES Download PDF $ cat CV-EN.pdf CV-EN Download PDF