Work

Case studies from healthcare interoperability, industrial edge platforms, and systems engineering — plus open-source tools and products.

Case studies

Healthcare Interoperability Platform

2025 — Present

Making deeply nested FHIR clinical data queryable for analytics and machine learning.

A healthcare data infrastructure company

RustPythonHL7 FHIRSQL-on-FHIRRead case study

Healthcare Claims & Validation Systems

Recent

X12 claims processing and validation infrastructure for clinical laboratory operations at national scale.

Labcorp — client work through an enterprise software services firm

X12EDIHealthcare claimsRead case study

Industrial Edge Platform

2022 — 2025

Edge connectivity for industrial HVAC systems — from PLC to dashboard.

Trane — client work through an enterprise software services firm

Ignition EdgeOPC UACODESYSReactViteRead case study

Hospital Information System Architecture

Recent

System architecture and product definition spanning pharmacy to emergency care.

A hospital systems initiative

Systems architectureProduct requirementsRead case study

Open source & products

turtle-hypervisor

2026

A single-binary Windows tray app that shows which hypervisor mode the machine booted in and flips it for the next boot — deciding whether Docker or VirtualBox gets native speed. Pure Go standard library with direct Win32 syscall bindings, CPUID-based mode detection, and a fixed-GUID tray icon that survives Windows' overflow shuffle.

GoWin32 APIWindows

identity-crisis

2026

A Windows system-tray app that switches the active git/ssh identity in one click — SSH key, commit author, and SSH commit signing key together. A core.sshCommand wrapper injects the active key per operation and warns on repo-owner mismatches without ever blocking git. Tested end-to-end against a stub ssh, with CI on every push.

GoWin32 APIGitSSH

Cycle Tracker

2025 — 2026

A women fertility cycle tracker for couples that gives insight of the current phase

ReactTypeScriptMUI5

Helios FHIR Server

2025 — Present

Package providing SQL-on-FHIR bindings to seamlessly extract and transform complex HL7 FHIR clinical data for advanced analytics and machine learning workflows

RustPythonFHIR

saas-report-wmm

2025

A SPA approach on the generation of WMM-reports

ReactTypeScriptFastAPIMUI5

pywmm

2025

Core logic to calculate the world magnetic model

PythonNumpy

Monokai Modern Dimmed

2025

A custom theme combining Dark Modern UI with Monokai Dimmed syntax highlighting

World Magnetic Model Report Generator

2025

A desktop application that generates reports for the World Magnetic Model

PythonPyQt5

Bolivian Sign Language Recognition

2021 — 2022

Gesture recognition on Bolivian Sign Language using neural nets.

PythonKerasOpenCVNumPyPandas

© 2026 Douglas Rojas

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