Full Stack Developer

I build product that moves numbers.

Three years building product across retail, legal tech, public education and AI dashboards. In retail, the analyses I designed moved revenue on key products between 34% and 827% over eight months.

Selected work

Stealth Startup, inventario inteligente para retail

2025 - presente

Founding Developer

Confidential project

A platform that replaces spreadsheets and intuition with data-driven inventory decisions: what to stock, how much to reorder and when. I designed the ABC analysis and replenishment models at the core of the product, with early detection of overstock and stockouts, plus per-SKU reorder recommendations. I integrated Claude and Gemini to speed up analysis and generate actionable insights.

  • Key products for a real client grew between 34% and 827% in revenue after eight months running on these analyses.
  • Early detection of overstock and stockouts, previously manual.
  • Node.js
  • Express
  • TypeScript
  • React
  • PostgreSQL
  • Python
  • Claude
  • Gemini

acelerIA

2026 - presente

Frontend Developer

A training program helping people and communities navigate AI-mediated work environments, with explicit priority on women and people over 45. It rests on three pillars: personalized learning through adaptive algorithms, specialized mentoring and gamification. I built LMS interfaces: learning journeys, AI mentor chat, flashcards, quizzes and skill progress visualization. tomorrow.media develops it under contract with UTEC, the Technological University of Uruguay.

  • Backed by fAIr LAC and BID LAB, the Inter-American Development Bank innovation lab.
  • Inclusive design as a product requirement, not an afterthought.
  • React
  • TypeScript
  • Vite
  • Redux Toolkit
  • React Query
  • Django
  • PostgreSQL
  • Terraform
  • AWS Bedrock

UNAI

2026 - presente

Co-founder and Full Stack Developer

A platform for launching commerce, portfolio, institutional and booking sites, with client, sales and activity management. A personal project built with a partner. It is the main source of the components in the lab.

  • Custom Three.js particle engine.
  • Unified motion system across the whole application.
  • React 19
  • Vite
  • Tailwind CSS v4
  • Three.js
  • Express
  • Socket.io

YesLawyer

2025 - 2026

Frontend Developer

Employment case management platform for Capital Rights Law: legal consultations, demand letters, agency filings and settlements. I built services, integrations and automations, and strengthened quality with automated validations and AI-assisted end-to-end tests.

  • 4.8 out of 5 on Trustpilot across more than 1,400 reviews.
  • Django
  • Django REST Framework
  • Celery
  • PostgreSQL
  • Redis
  • Next.js

Deflection.ai

2024 - 2025

Lead Frontend Developer

Dashboards for conversational AI with configurable workflows and visual customization. I integrated Stripe payments and configurable widgets. As Lead, I reviewed code, defined features alongside the CEO and CTO, and mentored the team.

  • Progressed from Frontend Developer to Lead in under a year.
  • Next.js
  • Tailwind CSS
  • Stripe

Experience

  • Stealth Startup

    Founding Developer · Freelance

    2025 - presente
  • tomorrow.media

    Frontend Developer · Freelance

    2025 - presente
  • Capital Rights Law

    Frontend Developer · Contract

    2025 - 2026
  • HackCTF

    Frontend Developer · Contract

    2024 - 2026
  • Deflection.ai

    Lead Frontend Developer · Contract

    2024 - 2025
  • Desengo

    Co-founder and Full Stack Developer · Freelance

    2023 - 2025
  • NextMed

    Full Stack Developer · Contract

    2023 - 2024
  • Grupo Consultores de Empresas

    Full Stack Developer · Contract

    2023

Education

  • BSc in Cyberdefense

    Universidad de la Defensa Nacional UNDEF

    2026 - 2030

Technologies

Frontend
ReactNext.jsTypeScriptJavaScriptHTMLCSSTailwind CSSViteChakra UI
Backend and data
Node.jsExpressNest.jsPythonFastAPIDjango RESTCeleryPostgreSQLRedisSupabase
Infrastructure
DockerAWSGitHub ActionsVercelNetlify
Quality
JestReact Testing LibraryPlaywrightPostman
Product
StripeAuth0FigmaGitGitHubGitLabScrum

Languages

  • Spanish

    Native

  • English

    C1 Advanced. EF SET 69 out of 100, 2024

Certifications

  • Scrum Foundation Professional, SFPC

    CertiProf · 2023

  • TypeScript Certification

    Coderhouse · 2023

  • Full Stack Developer, backend programming

    Coderhouse · 2021 - 2022

  • Full Stack Developer

    Henry · 2022

Component lab

Real components pulled from production projects. Interactive, with copyable source.

ThinkingSteps

Agent reasoning step timeline. Each step animates in, previous ones are marked complete and joined by a connector line. Includes an error state.

Origin: Dashboard de analitica conversacional en produccion
Final

JourneyCarousel

Carousel with a progress rail. Dots track their cards, distinguish four states, and connect through dotted segments that inherit a gradient via mask-image.

Origin: Reimplementacion propia de un patron que disene para un LMS
●

Fundamentos

Conceptos base y vocabulario.

Duración:
30 min
◐

Práctica guiada

Ejercicios con acompañamiento.

Duración:
45 min
◑

Proyecto corto

Aplicación en un caso acotado.

Duración:
2 h
◒

Revisión entre pares

Lectura cruzada de entregas.

Duración:
1 h
○

Cierre

Síntesis y siguientes pasos.

Duración:
30 min

Ningún paso seleccionado

Visibles
See all ten components
Raúl Ereño

About

I work in JavaScript and TypeScript across React, Next.js and Node.js, reaching for Python when the problem is about data. What interests me is the stretch between a product decision and a number that moves, and getting emerging technology into production without the team paying for it later. I am looking to keep growing at global startups, on remote teams, contributing to both product and architecture.

Activity

2,982 contributions in the last six months

  • September 2025: 5
  • October 2025: 76
  • November 2025: 48
  • December 2025: 17
  • January 2026: 36
  • February 2026: 240
  • March 2026: 567
  • April 2026: 601
  • May 2026: 778
  • June 2026: 230
  • July 2026: 69
  • August 2026: 477
  • September 2026: 689

Includes private repositories. The graph covers the last twelve months.

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Contact

raulereno@gmail.com

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