🟢 Available for Software, SaaS & Continuous Maintenance

I Build SaaS Products
& Enterprise Architectures

From product conception to cloud deployment and long-term maintenance. Specialist in .NET 10, CQRS, DDD and high-concurrency systems.

Core tech.NET 10AzureAWSNestJSAngularNext.js
Fabian Cristobal
CQRSDDDAzureSaaS
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— Value Proposition —

Robust Architecture. Frictionless Maintenance.

Why do enterprises and SaaS startups trust my work?

Enterprise Architecture (.NET Core Focus)

I design scalable systems with Clean Architecture, Vertical Slice, and Domain-Driven Design (DDD) — free from technical debt.

Product Engineering (SaaS End-to-End)

I don't just write code — I understand the business, optimize user flows, and integrate AI and payment gateways to maximize ROI.

Maintenance & Continuous Evolution

Your software is never abandoned after delivery. I handle evolutionary support, cloud monitoring, database optimization, and security updates.

Logistics, FinTech & Big Data

Specialized solutions for mission-critical industries: multi-branch control, billing automation (Stripe), and corporate data analysis with Python.

— Production —

Systems Designed to Scale

Real projects built on .NET 10 (ASP.NET Core Web API) with high engineering standards.

v1.0

Multi-Branch Logistics Management System

Real-time control of inventories, inter-branch dispatches and stock synchronization under high concurrency.

.NET 10AngularRedisSQL Server
View on GitHub
v2.0

Payment & Subscription Management Platform

Recurring billing API with Stripe, secure webhooks, billing cycle control, CQRS and JWT.

.NET 10SupabasePostgreSQLCQRSJWT
View on GitHub
v3.0

QaliQuipu - Preventive Intelligence for Peru's Health

Offline-First logistics orchestrator powered by Gemma 4 to prevent medical stockouts in rural areas without internet connectivity

PythonHTMLGemma 4Ollama
View on GitHub
v4.0

AI Inventory Extractor

AI-powered Multimodal Worker that automates the structured extraction of logistics vouchers and synchronizes stock directly to the database.

PythonAI AgentPydanticAutomation
View on GitHub

— Tech Stack —

Industrial-Grade Toolchain

.NET 10Primary Core
NestJS
TypeScript
Python
C#
CQRS / DDD
Clean Architecture
Vertical Slice

— Hire Me —

Ready to Build or Scale Your Software?

Let's work together on your next enterprise or SaaS project.

Fiverr Pro

For targeted .NET API development, advanced integrations, or architecture refactoring.

View Fiverr Profile

Upwork

Available for Product Engineer contracts, long-term SaaS development and enterprise maintenance.

View Upwork Profile

— Contact —

Let's Talk

Open for new projects and technical consultations.

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ONLINE

Typically responds within 24h