Open to full stack & .NET roles

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Gustavo LarcoFull stack software engineer.

I build production web applications with C#, ASP.NET Core, SQL Server and React. Today I ship SaaS products for leading global HVAC manufacturers at Simplicity Software. Before that, I built and ran My-Negocio, a multi-tenant SaaS, on my own — from database design to CI/CD.

See my work Resume (PDF)

St. Louis, MO · on-site, hybrid or remote English & Spanish (native) GitHub LinkedIn

2+ yrs

professional software engineering (intern → engineer)

enterprise SaaS products I build and maintain today

223

C# files in My-Negocio — designed and written solo

live client websites, plus 8+ concept sites

01 — What I do

One engineer, four ways to help your team.

I write the software, model the data, build the reports and wire in AI. Pick the role you're hiring for.

Production web apps, from schema to deploy.

Backends in C# and ASP.NET Core over SQL Server, React front ends, and the pipelines that ship them.

What I do

Design MVC and REST backends with Entity Framework Core and SQL Server
Build multi-tenant, role-based systems with background workers and third-party integrations
Automate delivery with GitHub Actions to Azure and AWS

Tools

C#ASP.NET Core 9EF CoreSQL ServerReactTypeScriptAzureGitHub Actions

Where I've done it

Simplicity Software2024 – now

Build and maintain 4 SaaS products for leading global HVAC manufacturers.

My-Negocio2025 – 2026

Multi-tenant SaaS built solo: 223 C# files, 243 endpoints, SRI e-invoicing, blue-green deploys.

See the case study

MyHotel2026

Hotel operations console with a live rooms board over SignalR.

02 — Selected work

Real software, shipped to real users.

A production SaaS I built end to end, apps and sites that are live today, and the projects where I learned the stack.

Case study · Founder & sole developer 2025 – 2026

My-Negocio

A multi-tenant SaaS that let gyms, salons, restaurants and retail stores in Latin America run clients, appointments, sales, inventory and electronic invoicing from one web app.

Multi-tenant by design. Four business models on one codebase, per-tenant data isolation enforced on every query, role-based access (Owner / Admin / Seller / Employee) and BCrypt auth.
Ecuador SRI e-invoicing. XAdES-BES digital signatures, compliant XML generation, QR-coded RIDE PDFs and background services with automatic retry.
Operations built in. Scheduling with conflict prevention, POS with inventory audit trails, employee commissions, 17+ WhatsApp notification templates and daily email digests.
Shipped and operated. AWS Lightsail behind Nginx, GitHub Actions CI/CD with blue-green deploys, automated daily backups and Let's Encrypt HTTPS.

Product tour Source code Architecture docs SRI invoicing spec

Architecture

223

C# files

~29K

lines of C# (excl. migrations)

243

HTTP endpoints

database tables

background services

17+

WhatsApp templates

Ran in production 2025–2026; the hosting was retired as a business decision. The source is public, and the product tour shows the real UI with sample data.

maxspoocrew.com

Max's Poo Crew

Client · live

Website for a St. Louis pet-waste removal company. Multi-page site on Cloudflare Workers with local SEO (JSON-LD offers, service pages), pricing tables, Meta Pixel conversion events and a photo gallery served from an album API.

Cloudflare WorkersJavaScriptSEO / JSON-LDHTMLRewriter

Visit site

albumes.gustavolarco.workers.dev

Álbumes

Web app · live

Installable photo-album app for small businesses: admin, collaborator and read-only share links, uploads to object storage, rate-limited login and revocable sessions. Covered by API and browser tests. Built with AI-assisted development.

Cloudflare WorkersD1 (SQLite)R2PWAPuppeteer tests

Open app

gustavolarcodev.github.io/myhotel

MyHotel

C# · 2026

Multi-property hotel operations console with a rooms board that updates live over SignalR. Covers work orders, shift logs, cash counts, inventory and team messaging across five departments and five permission levels.

ASP.NET Core 9 MVCSignalREF CoreSQLiteGitHub Actions

Product tour Source code

gustavolarcodev.github.io/EduTools

EduTools

Full stack · 2025

Learning platform that organizes tutorials and downloadable tools by university program. Next.js/TypeScript front end and a Django REST API with roles and Premium content. The live demo is a static export running on sample data.

Next.jsTypeScriptDjango RESTTailwind CSS

Live demo Source code

gustavolarcodev.github.io/poker

Casino Trainer

JavaScript

Six browser games — Texas Hold'em, Blackjack, Baccarat, Truco, Dominoes and Chess — with a coach that explains each decision in real time. Vanilla JavaScript, no dependencies, no build step.

JavaScriptGame logicGitHub Pages

Play Source code

CarCar

Team project · 2024

Dealership management system split into microservices for inventory, sales and service appointments, integrated over REST and containerized with Docker Compose.

PythonFastAPIReactMongoDBDocker

Hack Reactor team project · code not public

Websites

Live sites for client businesses and concept sites — mobile-first, accessible and SEO-ready.

Trap House Performance automotive website

Trap House PerformanceClient · Automotive

DanielitoClient · Restaurant

FTrucksConcept · Manufacturing

SkyFumigConcept · Agritech

NutriVidaConcept · Health

Mi GimnasioMy SaaS landing

La MesaConcept · Restaurant

Casa & EstiloConcept · Retail

Bella NailsConcept · Beauty

03 — Experience

From intern to engineer on enterprise SaaS.

May 2025 – Present
Current

Software Engineer · Simplicity Software

Build and maintain 4 SaaS products for leading global HVAC manufacturers using C#, ASP.NET Core 9, Entity Framework Core and SQL Server.
Work in Agile/Scrum — daily standups, sprint planning and ticket-driven development in Jira and Azure DevOps.
Design interactive Power BI dashboards with DAX measures that stakeholders use for operational reporting.
Maintain GitHub Actions CI/CD with automated deployments to Microsoft Azure and file storage on Azure Blob Storage.

C#ASP.NET Core 9EF CoreSQL ServerAzurePower BIAzure DevOps

Mar 2024 – May 2025

Software Engineer Intern · Simplicity Software

Built and maintained C# backend services, APIs and automations integrated with Azure services.
Developed Power BI dashboards over SQL databases, APIs and cloud storage; tuned performance with DAX.

Jan 2024 – Present

Full Stack Developer · Freelance

Built and deployed live websites for three small businesses — including maxspoocrew.com (Cloudflare Workers, local SEO, conversion tracking) — plus 8+ mobile-first concept sites.
Founded and built My-Negocio, a multi-tenant SaaS, and operated it in production (2025–2026).

Aug 2023 – Aug 2024

Warehouse Associate · Coach Ambassador · Amazon

Trained and mentored 15+ associates on operational best practices.

Jun 2022 – May 2025

Guest Services · front desk & bar · Marriott Aloft Hotel

Held alongside the roles above while studying and working in software.

04 — Skills

A .NET core, with data and AI around it.

Backend

C#ASP.NET Core 9EF CoreSignalRREST APIsDjango / DRFFastAPINode.js

Frontend

ReactTypeScriptNext.jsJavaScript (ES6+)RazorTailwind CSSBootstrap 5HTML5 / CSS3

Data & BI

SQL ServerSQLPostgreSQLMySQLMongoDBPower BI / DAX

Cloud & DevOps

AzureGitHub ActionsAWS (Lightsail, S3, RDS)DockerNginxCloudflare Workers

AI engineering

Claude CodeMCP serversAgent workflowsPrompt & tool designGitHub CopilotCursor

Integrations & teamwork

Stripe APIWhatsApp Cloud APISRI e-invoicingMailKitGitAgile / ScrumJiraAzure DevOpsFigma

C#= what I use every day at work

05 — Education

Jul 2024

Hack Reactor

Advanced Software Engineering Immersive — 800+ hours of full-stack training in Python, JavaScript and React, with pair programming and Agile team projects.

2019

Technical University of Machala (Ecuador)

Environmental Engineering — 7 semesters completed.

06 — Contact

Hiring for a full stack or .NET role? Let's talk.

Based in St. Louis and open to on-site, hybrid or remote. I usually reply within a day.

gustavo.larcoj@gmail.com LinkedIn Resume (PDF)