I like Flutter and making real-world solutions, exploring the issues that matter to me. Mobile development is my thing because there's nothing like shipping something tangible that people can hold in their hands. On the professional side I spend my days with PeopleSoft, Boomi, and enterprise integrations (the badges below have the full rundown).

For the corpo talk — titles, bullet points, the works — here is my LinkedIn

When I'm off the clock you'll usually find me at a hackathon or poking at a side project — lately that's meant OCR receipt trackers, dashcam apps, and a few AI experiments.

Languages

Mobile & Frontend

Backend & Cloud

Databases

Integration & ERP

Tools & Practices

I also keep a soft spot for the fundamentals: OOP, SOLID, MVVM, and writing things so the next person (often future me) can actually read them.

SkillCourt — Team lead and Flutter developer for an IoT sports-training platform. Ran the Agile cadence for a 3-person team and built real-time hardware-to-app communication over WebSockets. Kept contributing after graduation, including a Python emulator so we could test without the physical training pads.

Serverpod Butler — A full-stack OCR receipt tracker (Flutter + Serverpod) that uses the Gemini API to break down spending and project savings goals. Designed the app and modeled the database schema end-to-end.

Trial Pathway — A clinical-trial recruitment platform built for a health-tech hackathon, using Flutter, PostgreSQL, and Hugging Face's BART NLP model to improve patient matching and retention.

Dashcam (Kiroween) — A modern take on the dashcam built in Kotlin with CameraX and Android's location and background-recording APIs — the idea being that the phone in your pocket has better sensors than most dedicated dashcams.

I'm not here to hand AI the keys — I'm exploring where these tools genuinely boost my efficiency. Claude Code is part of that experiment: I pair it with Obsidian to build useful dashboards and to document and illustrate my own code, which pushes me to understand it more deeply rather than less. On the testing side, I've been driving PeopleSoft UI flows with the Playwright CLI and MCP through Claude — work that's feeding into an automated UI testing framework I'm building for it right now.

• Exploring Terraform and infrastructure-as-code on GCP
• Mobile development, because I love shipping something tangible people can hold in their hands
• Finding an excuse to join the next hackathon

• Boomi Professional Developer — Boomi (2025 – 2027)
• Postman API Fundamentals Student Expert — Postman (2024)
• Learning SOLID Programming Principles — LinkedIn Learning (2024)
• SQL Hands-On Practice (Intro, Basic, Intermediate, Window Functions) — LinkedIn Learning (2024)
• Computer Networks (URX45) — Universidad del Rosario / edX (2024)

• Portfolio: johnnycasares.github.io
• LinkedIn: in/casajohn

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