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Full Stack Developer · Lima, Peru

Hernando Arima

Hernando Javier Arima Arce

Fullstack since 2018. JavaScript (Angular, React, Vue), APIs in Node.js, Python and .NET Core, data in PostgreSQL, SQL Server and MongoDB. Git, Azure DevOps, IIS, Nginx and Docker.

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Hernando Arima

Work

Experience

  1. Fullstack Developer

    Jun 2026 — Aug 2026

    Freelance (Confidential) · Remote

    Subcontracted by a software vendor: a React design system and a computer-vision system with an operations console.

    • Design-system foundation: color, type, grid, shadow, and spacing tokens as a single source of truth, with light and dark modes (React, TypeScript, Tailwind).
    • Atomic Design components faithful to Figma: declarative props, keyboard accessibility, Storybook stories, and unit tests.
    • tRPC endpoints to move provider keys out of the browser bundle, with response caching and rate limiting.
    • Python computer vision (OpenCV, YOLO) with a PySide6 console, Express/MongoDB API, and React + Vite backoffice. pytest, ruff, Vitest, and GitHub Actions CI.

  2. Backend Developer

    Jan 2025 — Mar 2026

    Technology Company (Confidential) · Remote

    Node.js backend: adapters to external APIs, remote commands, and telemetry.

    • Built and maintained Node.js, Express, and PostgreSQL adapters for multiple APIs.
    • Reverse-engineered mobile apps with Charles, mitmproxy, and HTTP Toolkit to track API changes.
    • Cut remote-command errors with pre/post checks and retries. Debugged auth and data incidents with Observe and AWS.

  3. Fullstack Developer

    Aug 2023 — Jan 2025

    Growfi Software · Lima — remote

    Nuxt/Astro platforms, Rust BaaS, and VPS work with Docker and Nginx.

    • Shipped chatbots, AI tool platforms (Claude, GPT, Llama), and store builders in Nuxt 3, Astro, Express, and Bun.
    • Rust/Axum BaaS and Toki webhook (tokibot.ai): WhatsApp/Telegram + GPT, MongoDB.
    • On-chain voting (Ethereum, Polygon), Detectron2, Backblaze. Linux deploys with Docker and Nginx.

  4. Analyst Developer

    Sep 2019 — Feb 2023

    VCA Peru · Lima

    Fullstack Angular/React, Node, Python, .NET Core, and PostgreSQL.

    • Conversation-flow designer UI, JS widgets, and CRUD/reporting in PL/pgSQL.
    • Microservices for Watson, Culqi, MercadoPago. STT and NLP (Rasa, Duckling, spaCy). REST middleware to Odoo.
    • Windows/IIS and Linux/Nginx deploys. Git and Azure DevOps.

  5. Web Developer

    Apr 2018 — Jan 2019

    A&C Consultores · Trujillo

    Inventory and purchasing systems: Angular 5, .NET Core 2, SQL Server, Azure.

    • Angular 5 + Bootstrap front. .NET Core 2 APIs on MS SQL Server.
    • Shipped on Azure. Version control with Visual Studio Team Services.

Selected work

Projects

01TypeScript

Funds

Mutual-fund comparator and analytics (BBVA, ERNI/Inteligo, and Tyba/Credicorp). Relative % series net of management fees, interactive Chart.js graphs, ranking, and a $0-cost serverless architecture.

  • TypeScript
  • AWS CDK
  • AWS Lambda
  • MongoDB Atlas
View caseOpen live ↗
02Nuxt 4

Spender

Personal finance app: expenses, income, transfers, accounts, and reports. Web and Android from one codebase, offline-capable with background sync.

  • Nuxt 4
  • Capacitor 8
  • Express
  • MongoDB
View caseOpen live ↗Download APK ↗
03Kotlin

Tebeo

Android comic reader, video player, and book reader that plays straight off the NAS and clouds without importing: WebDAV, SMB 2/3, SFTP, S3, OPDS, and Rclone Crypt, with Cast/DLNA streaming.

  • Kotlin
  • Jetpack Compose
  • Media3 ExoPlayer
  • Room
View caseDownload APK ↗
04Kotlin

WhatsCheck

Android app that checks in real time whether an unknown incoming caller has WhatsApp using the user's own linked companion device. Non-blocking CallScreeningService, embedded Go engine (whatsmeow) via gomobile, Jetpack Compose overlay, and extreme data minimization.

  • Kotlin
  • Jetpack Compose
  • Go (whatsmeow)
  • gomobile / JNI
View caseView code ↗
05Rust

Exchange API

USD FX API. Serves today's snapshot from MongoDB; on a miss it hits Fixer (Apilayer), stores it, and returns it.

  • Rust
  • Axum
  • MongoDB
  • Fly.io
View caseOpen live ↗
06Node.js

Promos

Centralized search for bank, card, and merchant promotions. Filter by promo name, restaurant, or store.

  • Node.js
  • Express
  • Cloudflare R2
  • Nuxt 3
View caseOpen live ↗
07Python

RAG Index

RAG lab: PDF to nodes, SummaryIndex and VectorStoreIndex, router between summary and detail. LLM and embeddings via NVIDIA NIM. Index on disk.

  • Python
  • LlamaIndex
  • NVIDIA NIM
  • RAG
View caseView code ↗
08Node.js

Node AMQP

Messaging lab with amqplib: durable queue, workers, fanout, direct routing, and topics against local RabbitMQ.

  • Node.js
  • amqplib
  • RabbitMQ
  • AMQP
View caseView code ↗
09Node.js

WooCommerce webhook

Personal bridge (unpublished). Connects a relative's WooCommerce store to a messaging service: order events and catalog lookup over chat.

  • Node.js
  • Express
  • WooCommerce
  • Redis
View casePrivate use
10Node.js

Arabic perfumes

Personal tool (unpublished). A relative compares perfume wholesalers, sees price per product, and builds a buy list.

  • Node.js
  • Puppeteer
  • Cheerio
  • Axios
View casePrivate use

Next.js

This site

Portfolio on Next.js App Router and TypeScript. Routes via generateStaticParams, per-page metadata, ES/EN i18n, and a static export to Cloudflare Pages. No CMS, no request-time runtime.

  • Next.js
  • TypeScript
  • Tailwind CSS
  • SSG
  • Cloudflare Pages

About

Hernando Javier Arima Arce. Full Stack Developer in Lima. Recent Node.js backend and API integrations; before that Nuxt/Astro platforms, Rust, and product work at VCA. The harima.top projects cover FX, promotions, personal finance, and funds. Off the web, native Android: Tebeo, a comic and media viewer that reads off the NAS and clouds without copying, and WhatsCheck, real-time WhatsApp verification for incoming calls. And personal tools: a perfume wholesaler comparator and a WooCommerce-to-messaging webhook.

Web

  • Vue.js / Nuxt 3
  • Astro
  • React
  • Angular
  • Tailwind CSS
  • Capacitor

API

  • Node.js / Express
  • tRPC
  • .NET Core
  • NestJS
  • FastAPI
  • Flask
  • Rust / Axum

Languages

  • JavaScript
  • TypeScript
  • C#
  • Python
  • Kotlin

Data

  • PostgreSQL / PL/pgSQL
  • MongoDB
  • Redis
  • MS SQL

Cloud & DevOps

  • AWS
  • GCP
  • Azure
  • Docker
  • Nginx
  • Git
  • Cloudflare
  • Fly.io

Other

  • Webhooks
  • API reverse engineering
  • Android (Jetpack Compose)
  • Design systems (Storybook)
  • Computer vision (OpenCV, YOLO)
  • Desktop apps (PySide6)
  • Blockchain
  • AI/ML integration

Languages

  • SpanishNative
  • EnglishB2 Upper Intermediate (EF SET)

Education

  • Industrial Engineering

    Universidad Privada del Norte, Trujillo · 2010 — 2014

  • API Security with the Apigee API Platform

    Google Cloud - Coursera · 2026

  • API Design and Fundamentals of Google Cloud's Apigee API Platform

    Google Cloud - Coursera · 2026

  • Google Cloud Fundamentals: Core Infrastructure

    Google Cloud - Coursera · 2026

  • Certified Nuxt Master

    Vue School · 2024

  • Scrum Foundation Professional Certificate (SFPC)

    CertiProf · 2023

  • JavaScript Algorithms and Data Structures

    freeCodeCamp · 2022

  • IBM Cloud Essentials V3

    Cognitive Class · 2021