Juan Alvaro · Full-stack developer

I build useful, free apps.

Full-stack developer based in Arequipa, Peru. At work, I build a dealer management system (DMS) integrated with SAP; in my free time, tools for everyday life.

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Photo of Juan Alvaro Crespo Espinoza in front of the Cathedral of Arequipa

Apps

In beta

Kipu

Track your expenses and income, see your monthly summary, and keep your tax-deductible expenses under control.

Android

Join the beta
In beta

Alertuy

Describe a task and learn its hazards, risks, and controls under Peruvian occupational safety law.

Web

Try it free

About me

Systems Engineering graduate with 4 years of experience as a full-stack developer. Beyond coding, I gather requirements from business users and model processes in BPMN. In my own projects, I explore generative AI and mobile apps.

Experience

  1. Analyst Programmer II · Autrisa S.A. e Incamotors

    Jul 2024 – present

    Full-stack development of the dealer management system (DMS) used across the group's companies and branches, integrated with SAP Business One and SUNAT e-invoicing (Peru's tax authority): after-sales, parts, sales, and cash management.

    Vue.js · Quasar · Node.js · AWS Lambda · MySQL · SAP Business One

  2. Software Engineer III · INITCHANGE S.A.C.

    Aug 2022 – Mar 2024

    SaaS products for e-invoicing (YaFacturalo) and occupational health and safety (SSOMAPRO): backend, management back office, and landing pages.

    NestJS · Next.js · React · Laravel · AWS Lambda

  3. IT Support Operator · Ministry of Education of Peru

    Nov 2021 – Feb 2023

    Technical support for nationwide teacher assessments.

What I work with

Frontend
Vue.js · React · Next.js · Astro · Tailwind CSS
Backend
Node.js · NestJS · Express · Laravel · Prisma
Mobile
React Native (Expo) · Kotlin Multiplatform
Cloud and data
AWS Lambda · Serverless · Firebase · MySQL · SQLite
Applied AI
LLM APIs · LangChain · RAG · n8n

Bachelor's degree in Systems Engineering · UNHEVAL, Huánuco · Top third of the class

Support

My apps are free and ad-free. If one of them is useful to you, you can support it.

Goal: bring my apps to iPhone

Apple charges US$99 a year for a developer account. Every contribution gets me closer.

From Peru

Yape QR code of Juan Alvaro Crespo Espinoza
Save QR

Luego ábrelo en Yape: Escanear → Galería.

Scan it with Yape (Peru). No fees.

Plin QR code of Juan Alvaro Crespo Espinoza
Save QR

Luego ábrelo en Plin: Escanear → Galería.

Scan it with Plin from your bank's app (Peru). No fees.

From abroad