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Field Mapping Tool
Angular + .NET Core tool to configure CRM connections (Salesforce, Redtail, etc.) and map fields into PDF-ready forms. In production at VirtualMind.
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Open to senior roles · Santo Domingo, DR
YeisonLapaix
I build web applications with ASP.NET Core, C# and Angular — and I write about what I learn along the way. Currently Senior Full Stack Developer at VirtualMind, working remote from Santo Domingo.
01The Writing
Field notes from 11+ years of shipping software.
The archive is built from real project scars: async traps in C#, sibling communication in Angular, EF Core performance tricks, and the patterns that earned their keep. No listicles — just posts I wish I had read before the bug ate my week.
Browse the archive →- Angular sibling communication
- EF Core performance cheatsheet
- Async/await review scars
- Elasticsearch caching war story
- Automating Redtail CRM with .NET
- CSV mapping tool in Angular
- SOLID in practice
- Eleven years: what I believe
02Projects & Writing
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DocuSign Extension
When a user signs a document, extract field info and expose it through a clean .NET Web API. Shipping at VirtualMind.
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Generic EF Core Repository
The abstract repository + EF Core pattern that cut a week off a delivery deadline at XpertCode — with 20+ microservices behind it. Open source.
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yeisonpx.com
This blog. English and Spanish tutorials on C#, Angular, and everything in between. Written from real project scars. Updated weekly.
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Elasticsearch Caching
How we got page loads on PaginasAmarillas.com.do under 2 seconds and lifted organic traffic by 15%. A war story worth reading.
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Redtail CRM API
Automated Redtail CRM forms with .NET and multithreading — cut a PDF-generation pipeline by 30% through careful profiling.
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03From the blog
·May 27, 2026·12 min readOOP Questions You Should Master for Technical Interviews
Many programmers lose interviews not because they can't code, but because they can't clearly explain concepts they use every day. This guide covers the most common OOP interview questions.
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·Oct 20, 2024·5 min readHow to Pass Data Between Two Child Components in Angular
Learn three techniques for passing data between child components in Angular: @Input/@Output, shared services with BehaviorSubject, and an Event Bus pattern.
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·Oct 1, 2024·4 min readHow to Solve the 'Cannot Read Property of Undefined' Error in Angular
Learn why the TypeError: Cannot Read Property of Undefined occurs in Angular and how to fix it using safe navigation, ngIf, and proper lifecycle management.
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·Jan 5, 2024·4 min readStep by Step: Connect to WordPress Using C#
Learn how to connect to a WordPress website using C# and the WordPressPCL library -- covering JWT setup, NuGet installation, and code examples for creating and querying posts.
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04Selected work
Personal
Softopiax.com
Company website for Softopiax — built with Angular 20 SSR + NestJS 11.
- Angular 20
- NestJS 11
- MongoDB
- SSR
- TypeScript
05Stack / uses
Languages
C#JavaScriptTypeScriptPL/SQLSQLPython
Frameworks
ASP.NET Core.NET CoreEF CoreAngularVue.jsjQuery
Data
SQL ServerOracle DBMongoDBRedisElasticsearch
Infra
DockerIdentityServer4OAuth 2Oracle SOA SuiteHangFire
Practices
OOPSOLIDDesign PatternsScrumUnit TestingSEO
06Newsletter
One email. Every other Friday.
What I'm reading, the bug that ate my week, and the occasional rant about generic repositories. No spam, ever.
07What readers say
Yeison's EF Core repository pattern post actually saved our migration. Clear, opinionated, and it works. Best technical writing I've read this year.
Diego M.Buenos Aires, AR
His async/await-in-C# breakdown is the post I send to every junior on my team. It's practical, honest, and respects the reader's time.
Alicia R.Madrid, ES
The Angular sibling-communication tutorial cleared up in 6 minutes what the docs couldn't explain in an hour. Subscribed.
Marcus T.Austin, TX
I've followed Yeison's work since Caribe Media. Consistent, pragmatic, and deeply hands-on. One of the few DR devs writing in depth.
Luis P.Santo Domingo, DO
08Plans
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09FAQ