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Iván López Villegas

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Iván López Villegas

Software engineer in Mexico City

Over eight years of software development. My latest role was at Solera, where I worked on a CRM platform used by ~3,200 automotive dealerships: backend in C#/.NET, SQL Server and CI/CD. I have been the escalation point when production breaks, moved legacy systems to the web, and founded the local CRM team in Mexico, as both developer and Scrum Master.

I am looking for a Software Engineer III role in .NET.

When I'm not coding, I make pottery. I'm also into dinosaurs and video games.

Email me Play PaleoSharp Download CV
Fig. 1. Wheel-thrown jar, section and exterior.

PaleoSharp

A game for learning C# by programming EXC-1, a paleontologist robot. It starts with your first line of code and ends with SE II and SE III interview problems. I built it to train for my own interviews, and it runs entirely in your browser. Since a young age, video games and the competitive world have been part of my learning; PaleoSharp brings that together with my craft.

30 excavation levels, 52 interview-style challenges and 38 lessons with quizzes. The game text is in Spanish.

Play PaleoSharp

Best played on a computer with a keyboard.

A PaleoSharp level: a 13 by 5 excavation grid with EXC-1, two raptors and a flag.
  1. Raptoron the dig grid
  2. EXC-1the robot you program in C#
  3. Flaggrid coordinates (11, 2)
Fig. 2. A PaleoSharp excavation level. EXC-1 moves on the grid by the C# you write.

How it is built

  • Roslyn, the C# compiler, runs inside the browser on WebAssembly in a Web Worker. There is no server: the site is static.
  • Before running, an analyzer checks which APIs the program uses and a syntax rewriter injects guards against infinite loops and runaway recursion.
  • Challenges are graded with hidden cases and time limits relative to the reference solution, measured on the same machine. An O(n²) solution still fails even though the code runs interpreted.
  • The same core runs on desktop (Godot) and on the web, covered by 366 automated tests.

Technologies: C#, .NET 8, Roslyn, WebAssembly, React, TypeScript, Godot

Experience

What I do well

  • Resolving production incidents as the technical escalation point, from a generic error to root cause.
  • Migrating legacy systems: from Visual FoxPro to the web, or from one framework and database to their newer versions.
  • Leading without a formal title: I founded the local CRM team, mentored teammates and facilitated the team as Scrum Master while developing.
  • Working with teams in Mexico, India, the US and China.
  • Shipping with CI/CD (GitHub Actions, Jenkins, TeamCity, Octopus Deploy), observing with ELK and orchestrating AI inside the pipeline.
Fig. 3. My career as a coil-built vessel: one coil per role, the oldest at the base. Each coil is as tall as the time in the role.

Tools and education

Backend
  • C#
  • .NET
  • ASP.NET
  • Entity Framework Core
Data
  • SQL Server
  • PostgreSQL
  • stored procedures
  • ETL
  • SSRS
Frontend
  • React
  • TypeScript
  • AngularJS
  • Blazor
Delivery and operations
  • Docker
  • GitHub Actions
  • Jenkins
  • TeamCity
  • Octopus Deploy
  • ELK
  • Jira
Also used
  • Java
  • PHP
  • Laravel
  • Python
  • Django
Education
  • Bachelor's degree in Computer Systems Engineering, Universidad del Valle de México (2015–2020)
Courses
  • Scrum Master Training (Solera, 2023)
  • Git and GitHub (Platzi, 2021)
  • CCNA (UVM, 2018)
Languages
  • Spanish (native)
  • English (C1)
  • French (A1)

Contact me

If you have a backend or full-stack .NET role, I would be glad to talk. Available hybrid in Mexico City or remote. Write to me here and I will reply to your email.

You can also find me on

The role, the company, or anything you want to tell me.