# Jael

## Senior Software Engineer · AI Products

Ecuador (UTC-5) · contact@jael.build · https://linkedin.com/in/jael0x · https://github.com/jael0x · https://x.com/jael0x · https://jael.build

## Profile

Software Engineer with 6+ years shipping production systems across mobile, web, and connected devices, now building AI-native products end to end: designing Claude Code skills and agents, building MCP servers, and engineering the context they run on. Proven track record collaborating remotely in agile teams across industries including logistics, IoT, telecom, and health tech, shipping cross-platform applications to Google Play and the App Store, releasing developer tools on VS Code Marketplace, and implementing effective real-world solutions that are always focused on the user experience.

## Availability

Open to remote roles. Hired as a contractor by US companies, either through Deel or via a direct international transfer. No sponsorship needed.

English: B2 certified.

## Skills

- **AI & Agents:** Claude Code (skills, agents, subagents), MCP servers, context engineering, prompt engineering, agent-assisted delivery workflows.
- **Languages:** TypeScript, JavaScript, Python, Rust, Kotlin.
- **Frontend & Mobile:** React, React Native, Expo, Next.js, SolidJS, Astro, Zustand.
- **Backend & Data:** Node.js, Express, PostgreSQL, Supabase, Firebase.
- **Testing & Quality:** Playwright (E2E), Vitest, Sentry, Android vitals.
- **Developer Tools & Platforms:** VS Code Extension API, WXT, Bun, Git, Docker, Google Cloud, iOS, Android, Vercel.

## Experience

### Senior Software Engineer · AI Products | Independent Projects & Freelance

11/2025 — Present · Remote · Ecuador · Freelance & own products

- Built a reusable Claude Code skill library (skill-creator, agent-architect, auditor, spec, docs) that generates and maintains other skills and projects.
- Released Lattice, a VS Code extension for managing AI agent configurations (.claude/, .cursor/, .github/copilot-instructions) across repositories, on the VS Code Marketplace and OpenVSX.
- Released Psicomedical, a clinic management platform serving a clinic in Chile (React, Supabase); its Playwright E2E suite doubles as documentation tooling, generating the user manual from real flow captures.
- Built an agentic job-search system: a CLI, an MCP server, and a live SSE dashboard over one core store, with Claude Code skills driving discovery, classification, verification, and apply-assist.
- Won 1st place at ZKForge Hackathon 2025 with ZalaryCheck: architected the data extraction and ZK circuit, orchestrated AI generation of most of the code with a mock-first workflow, and shipped in under a week.

### Software Engineer | Shappi

04/2025 — 05/2026 · Remote · US company · Full-time contract

- Engineered cross-platform features in Flutter and Angular for a cross-border logistics company, shipping like a seasoned developer within two weeks of joining.
- Built the refurbished shop with 15+ products, 5+ variants each, with gallery carousel and payment flows, contributing to company revenue.
- Integrated PaySafe payment with invoice management and refund requesting.
- Supported the migration of the consumer and traveler apps to the Nova design system, and rebuilt the intake process into an admin web application with better performance.
- Developed a self-service issues and returns system with PDF upload and file validation, eliminating manual database queries and enabling department teams to resolve tickets independently.
- Architected a dynamic table framework with URL-based sorting, filtering, and pagination, adopted across ~20 modules including orders, alerts, returns, and payouts.
- Reduced the time taken to create one admin module by 60% by designing scalable, reusable solutions.
- Designed a dynamic form system within dialogs, enabling rapid creation of new admin modules, forms, and support workflows.
- Shipped interactive Astro islands for language and country selection with IP-based detection, supporting 5 countries for English and Spanish.
- Prototyped a Claude Code agent for ticket management, the start of an AI-assisted daily workflow.

### Mobile Application Developer | Wayru

06/2022 — 10/2024 · Remote · US company · Full-time contract

- Architected the transition from an unstructured and noisy codebase into a modular, well-structured React Native app with TypeScript and Zustand.
- Implemented Uber's H3 spatial indexing in PostgreSQL to filter and visualize 6 million+ Wi-Fi networks, reducing map query times from up to 7 seconds to under 500ms.
- Engineered a smart offline mode that auto-detects the user's nearest city or region and downloads local network data, enabling connectivity discovery without internet access.
- Integrated native Android features using Kotlin, including a network monitor and MLab speed measurement tool, providing real-time connectivity diagnostics.
- Owned end-to-end release management as the principal mobile engineer, shipping ~60 releases for Google Play and the App Store to users in 100+ countries.

### Full Stack Developer | Hop Scooter

10/2020 — 06/2022 · Remote · US company · Full-time contract

- Built a white-label mobile app system and admin web portal, deploying 5 branded apps to production across 8 countries: Ecuador, Finland, Lithuania, Spain, Australia, Mexico, Bulgaria, and Turkey.
- Integrated IoT features enabling real-time remote control of 1,500 electric scooters across 10+ fleets worldwide, with a team of 5 engineers.
- Rebuilt the operator app from scratch with full design ownership, and it became the primary daily tool for fleet operators across all markets.
- Reduced white-label app delivery time from 3 weeks to 1 week by streamlining the build, theming, and release process.
- Created Python reporting scripts for profit, rental metrics, and fleet analytics that later evolved into the company's admin dashboard, replacing manual data extraction.
- Developed NoSQL database migration scripts in Python to normalize document schemas, and built backend services with Express and Google Cloud Functions.

### Full Stack & Mobile Developer | Icono Sistemas

02/2019 — 12/2019 · Remote · Ecuador · Freelance

- Developed the "Icono HotSpot" system, a Wi-Fi solution offering limited-time Internet access in public spaces.
- Developed the "Xtrema FM Ecuador" mobile application to connect to Radio Xtrema's live stream.

## Education

- Engineer's Degree in Software Engineering · Universidad de las Fuerzas Armadas ESPE-L · 10/2014 — 03/2021
- English B2 · Cambridge · 2026
- Zero Knowledge Proofs · ZkCore Ecuador · 11/2025

## Certifications

- ZKForge Hackathon 2025 — 1st Place Winner · ZKForge · 2025
- Triplebyte Certified in React · Triplebyte · 2022
- Scrum Master & Product Owner · Certiprof · 2020 — 2022