WILLIAN'S WORLD V4 · CINEMATIC
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A BACKEND DEVELOPER PORTFOLIO

WILLIAN CHÁVEZ

BACKEND DEVELOPER · AI & MACHINE LEARNING
GENERATING WORLD...
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V4 · ORIGINAL FAN-MADE PIXEL ART — NOT AFFILIATED WITH MOJANG/MICROSOFT · EL SALVADOR GMT−6
PLAYER PROFILE
01 / 06
Willian Chávez
CLASSBACKEND/AI
XP3+ YEARS
SPAWNEL SALVADOR
STATUSONLINE·OPEN

Software engineer with 3 years of experience building scalable backend systems and, more recently, digital products powered by AI and Machine Learning. Specialized in Node.js, NestJS and clean architectures. I turn client needs into intuitive, reliable systems — always leveling up.

3+
Years XP
8+
Systems
4
Teams
SPANISHNative
ENGLISHB2
INVENTORY — SKILLS
02 / 06
LANGUAGES
Java
Java
JavaScript
JavaScript
TypeScript
TypeScript
BACKEND
Node.js
Node.js
NestJS
NestJS
REST APIs
REST APIs
Microservices
Microservices
MVC
MVC
Message Queues
Message Queues
FRONTEND
React
React
HTML
HTML
CSS
CSS
DATABASES
PostgreSQL
PostgreSQL
MongoDB
MongoDB
Redis
Redis
SQL Server
SQL Server
DEVOPS & TOOLS
Docker
Docker
AWS
AWS
Git
Git
GitHub
GitHub
GitLab
GitLab
NPM
NPM
AI & DATA
Machine Learning
Machine Learning
Data Analysis
Data Analysis
Predictive Models
Predictive Models
PRACTICES
Clean Architecture
Clean Architecture
Clean Code
Clean Code
SCRUM
SCRUM
QUEST LOG — EXPERIENCE
03 / 06

SOFTWARE ENGINEER

Addalitica · Remote · Full-time
ACTIVE QUESTOCT 2024 – NOW
  • ✓Web services for AI/ML-powered financial solutions
  • ✓APIs consumed as a digital product across financial-sector entities
  • ✓AddaShield: explainable fraud-risk API (geospatial ML, SHAP) — FastAPI, PostGIS, AWS EC2/S3/SNS
  • ›ML models & data analysis for financial predictions
  • ›Systems integration in production environments

PROGRAMMER ANALYST

Secretariat of Innovation · Presidency of El Salvador
COMPLETEDMAR 2023 – OCT 2024
  • ✓National solid-waste tracking system — Node.js, TS, NestJS, Docker, MongoDB
  • ✓Real-time GPS ingestion with message queues and Redis streams
  • ✓National HR system with React and NestJS
  • ✓Accessible system for CONAIPD for people with disabilities
LOOT:+30% EFFICIENCY+40% HR SPEED+50% ACCESSIBILITY

SOFTWARE DEVELOPER

Freelance
COMPLETEDAUG 2022 – MAR 2023
  • ✓Pharmacy web system — Node.js, TypeScript, MVC
  • ✓Inventory & stock control — React, Node.js, PostgreSQL
  • ✓Point-of-sale (POS) system for retail
LOOT:+35% ORDERS+25% STOCK ACCURACY+20% FASTER SALES
FEATURED BUILDS — PROJECTS
04 / 06

FRAUD RISK API — ADD A SHIELD

ADDALITICA · 2024 – NOW

Explainable fraud-risk scoring for financial institutions — geospatial ML + SHAP per decision.

FASTAPIMLPOSTGIS
GITHUB

ADDAPSYCS — BEHAVIORAL RISK

ADDALITICA · 2024 – NOW

Multi-tenant SaaS: versioned questionnaires + behavioral events feeding credit-risk scoring.

FASTAPINEXT.JSSAAS
GITHUB

NATIONAL WASTE CONTROL

SECRETARIAT OF INNOVATION · 2023

Real-time GPS tracking of ~240 collection trucks — WebSocket ingestion, Redis streams, geofences · +30% efficiency.

NESTJSREDISMONGO
GITHUB

SIPS — SOCIAL SERVICE PLATFORM

FIA-UES · IN DEVELOPMENT

Digitizes the full social-service lifecycle at FIA-UES — hexagonal NestJS 11, Next.js 16, BullMQ, full observability.

NESTJSNEXT.JSHEXAGONAL
GITHUB

WORLD CUP 2026 ORACLE

ML SPECIALIZATION · UES · 2026

XGBoost match model + 10,000-run Monte Carlo of the full 2026 bracket.

PYTHONXGBOOSTMONTE CARLO
GITHUB
SKILL BOOKS — EDUCATION
05 / 06
B.SC. COMPUTER SYSTEMS ENGINEERING
University of El Salvador
2021 – 2026
MACHINE LEARNING SPECIALIZATION
University of El Salvador
JAN – DEC 2026
ENGLISH — SECOND LANGUAGE
Junior Achievement El Salvador
2020 – 2021
JOIN THE SERVER — CONTACT
06 / 06

Have a backend to scale or an AI product to ship? My inbox is open.

SEND AN EMAILLINKEDIN · /IN/WILLIAN-CHAVEZGITHUB · /WILLIANCHAVEZPORTFOLIO · WILLIAN-CHAVEZ.NETLIFY.APPCALL · +503 7979-2639DOWNLOAD CV · ENGLISHDESCARGAR CV · ESPAÑOL
Usually responds within 24h · Spanish & English
© 2026 WILLIAN CHÁVEZ · FAN-MADE PIXEL ART · NOT AFFILIATED WITH MOJANG/MICROSOFT