Open to opportunities

Jafeath Vargas Villarreal

@jafeathvv

Full-stack developer shipping end-to-end features with React/Next.js, NestJS, and SQL—ownership, quality, and mentoring.

Costa Rica

Message

What I'm looking for

I’m looking for a team where I can take end-to-end ownership, communicate proactively, and ship reliable, maintainable software on schedule. I want to build with React/Next.js + NestJS, leverage strong testing, and continuously mentor teammates.

I’m a Full Stack Developer who ships features end-to-end, without needing hand-holding on either side of the stack. I take ownership from pixel-perfect React and Next.js interfaces to robust NestJS backends and optimised SQL databases, and I keep releases moving by asking the right questions early and translating ambiguity into actionable tickets.

With five plus years of production experience across agile product teams and data analytics environments, I reduce onboarding friction and raise code quality through testing discipline. I’m known for proactive communication, transparent release management, and building maintainable systems that teams can trust and evolve quickly.

Most recently, I’ve been responsible for the full reporting ecosystem powering executive and stakeholder decision-making. I own end-to-end Power BI dashboards and analytical reports—from KPI definition and data architecture through delivery and ongoing maintenance—and I extend SAP Analytics Cloud dashboards and stories using JavaScript to deliver custom interactive features.

Earlier, I led key technical initiatives as an Intermediate Full Stack Software Developer, spearheading feature development for large-scale education platforms while prioritizing performance optimisation and WCAG accessibility compliance. I also established unit and integration testing pipelines with Jest and React Testing Library, drove observability initiatives with actionable operational insights, and mentored teammates while championing Kanban methodology for continuous delivery.

Experience

Work history, roles, and key accomplishments

Current

Database Analyst

Current

Szych Consulting

Feb 2026 - Present (4 months)

Own the end-to-end reporting lifecycle for executive and stakeholder decision-making, delivering and maintaining Power BI dashboards and KPI-driven reports. Extend SAP Analytics Cloud using JavaScript (dashboards, stories, filters, and calculations) and integrate data from heterogeneous sources to ensure accuracy and timeliness.

Power BI SAP Analytics Cloud KPIs Data Integration JavaScript SQL Dashboard Development

Intermediate Full Stack Developer

Edify Software Consulting

Jan 2023 - Feb 2026 (3 years 1 month)

Led feature development for a large-scale education platform using Next.js and TypeScript with a focus on performance optimization and WCAG accessibility compliance. Drove observability initiatives, established unit and integration testing pipelines with Jest and React Testing Library, and coordinated risk-mitigated release management while mentoring teammates.

Next.js TypeScript Jest React Testing Library Performance Optimization WCAG Accessibility Observability Kanban Release Management

Junior Full Stack Developer

Edify Software Consulting

Jun 2021 - Dec 2022 (1 year 6 months)

Contributed to internal tooling and production-ready features across multiple stacks, collaborating with senior engineers on cross-functional agile delivery. Helped build an employee progress tracking system (React, Spring Boot, PostgreSQL) and supported a Next.js TypeScript text editor library focused on accessible formatting.

React Spring Boot PostgreSQL Next.js TypeScript SQL Testing Discipline

Database Analytics Developer

Szych Consulting

May 2020 - May 2021 (1 year)

Architected and implemented a dynamic reporting system using MS SQL and Excel VBA to enable customizable, parameter-driven reports and improved decision-making. Built and maintained an Asset Management System in C# to track asset lifecycle and repair/disposal status while coordinating with international teams.

SQL VBA C#Asset Management DataBase Systems Data Integration

Full Stack Developer

Instacredit

Jun 2019 - Apr 2020 (10 months)

Owned system enhancements and new feature delivery for a financial services platform, combining hands-on development with technical leadership. Designed complex SQL queries for data analysis workflows, improved system reliability with testing practices in C#, and supported knowledge transfer focused on loan approval process implementation.

C#SQL Backend Development Testing Financial Services Debugging