Stephanie Rosales Diaz

Polaris — local-first production life system (active)

SwiftUI, SwiftData, Node.js, Plaid API · ASTRONOMA

• Native macOS app that turns long-horizon goals into daily execution: questlines, mental health, household, personal care, deadline map, finance, and a stardust economy.
• Questline DAG engine (Q2.1–Q2.2): cycle detection, topological order, execution frontier, multi-parent unlock, and a LOCKED → ACTIVE → IN_PROGRESS → COMPLETED / FAILED state machine — pure Swift, independent of the UI tree.
• SwiftData persistence bridges for tracks and questline blueprints; domain stores for mental health, household, personal care, finance, and economy across a 60+ file Swift codebase.
• Plaid Link companion (Express): link-token create, public-token exchange, transaction sync with cursor persistence, Keychain rehydration after restart, production OAuth redirect path.

Schizophrenia transcriptomics — differential expression & gene networks (in progress)

Python, SciPy, pandas, GEO GSE21138

• Framing: diagnostic categories lack mechanistic validity; study dysregulated expression in schizophrenia using public post-mortem prefrontal-cortex transcriptomics (GEO GSE21138; PsychENCODE context).
• Pipeline: NCBI FTP fetch → forgiving metadata parse → row-wise t-tests (p-value, log2 fold change) → volcano plot; public write-up at github.com/st3phable/schizophrenia-gene-pipeline.

Hierarchical generative model of psychotic-like inference (active)

Python, Bayesian / predictive coding

• Research question: under what precision regimes does a hierarchical Bayesian agent form stable false beliefs despite sensory evidence?
• MVP: 2-level generative agent; mis-set sensory vs prior precision → pathological belief trajectories; simulation + write-up (computational psychiatry framing).

Neural activation & E/I-balance visualizer (public demo)

TypeScript, React, dynamical systems

• Interactive in-silico sketch of excitatory/inhibitory flow (dopaminergic gain vs GABAergic threshold) with homeostasis / hyperactive / hypoactive regimes. Public module on this site; source at github.com/st3phable/neural-visualizer.

ASTRONOMA — Founder / Systems Engineer

Remote · 2026 – present

• Building Polaris as a local-first product: SwiftUI client, Node Plaid backend, SwiftData persistence, and a DAG execution engine with cycle detection and topological unlock.
• Shipped product shell — Dashboard, Mental Health, Personal Care, Household, Questlines, Shop, Map, Finance — with user-editable CRUD instead of hardcoded presets.

Microsoft — Software Engineer Intern

Azure AD Identity Governance · Remote · Jul 2021 – Aug 2021

• Integrated a third-party workflow into a production identity platform — large codebases, careful abstraction, reliability.
• What stuck: reproducible pipelines, careful interfaces, and working inside complex systems — the same habits the research software and Polaris now run on.

Microsoft — EXPLORE Intern

Azure AD Identity Governance · Remote · Jul 2020 – Aug 2020

• A team software project in enterprise identity — first real exposure to how engineering gets done at scale.

Best Buy — Computing Sales Specialist → Sales Shift Lead

Fort Wayne, IN · Aug 2024 – Mar 2025

• Earlier: Home Theater / Sony rep, Oct 2023 – Jul 2024.
• Explaining technical things to real people under pressure, then leading and coaching a floor team.

Purdue University Fort Wayne

Fort Wayne, IN · Computer Science & Psychology coursework (Honors) · 2024–2026

Relevant: Discrete Mathematics, CS II (Java), C & Unix, Psychobiology

Pomona College

Claremont, CA · Computer Science coursework · Apr 2019 – Mar 2022

Relevant: Cognitive Science, Linguistics, Functional Programming (Coq)

LEDA Scholar, Cohort 14

Princeton University · Selective national program for high-achieving first-generation / low-income students. · 2017–present