Sage JasonTeixeira

Builder Profile

I build production-grade applications, AI systems, trading infrastructure, and cloud platforms. My work sits at the intersection of app development, machine learning, automation, and operator-grade UX.

Current focus: the Nexural ecosystem, a quant trading stack for research, regime detection, backtest validation, live execution support, journaling, and AI-assisted strategy review.

I also run Sage Ideas, an AI-native B2B studio shipping full-stack products, internal tools, automation systems, and cloud infrastructure for operators who need software that works under pressure.

Signal

mode        founder-engineer
focus       AI apps + trading systems
edge        ML, automation, cloud, QA gates
markets     ES NQ CL GC SI HG ZB RTY
language    Python 3.11 / TypeScript
stack       Next.js / FastAPI / Supabase / AWS
standard    production > prototype

Product Network

Sage Ideas

AI-native B2B studio for full-stack software, AI automation, internal platforms, SEO systems, and fractional CTO execution.

Positioning: App development, AI systems, automation, cloud, delivery infrastructure

Nexural

Institutional-style trading cockpit: quant research, regime-aware workflows, overfit checks, execution support, journaling, and AI copilot concepts.

Positioning: Trading infrastructure, ML signals, futures research, NinjaTrader automation

Sage After Dark

Creative and experimental brand surface for after-hours ideas, sharper design language, media, and product exploration.

Positioning: Brand lab, creative systems, experimental launches

LinkedIn

Professional background, work history, public credibility, and direct contact channel.

Positioning: Principal engineer, product builder, cloud and automation operator

Flagship Projects

Nexural Automation

NinjaTrader strategy analysis and development toolkit. Imports trade logs, calculates institutional-grade metrics, runs Monte Carlo simulations, performs overfitting checks, compares strategies, and produces AI-assisted improvement recommendations.

Python 3.11 FastAPI React Electron pytest Monte Carlo Deflated Sharpe Walk-Forward NinjaTrader

sageideas.dev

Production operating system for Sage Ideas: public site, CRM, contracts, e-signature, billing, client portal, audit logs, admin workflows, and delivery operations in one app.

Next.js 16 React 19 TypeScript Supabase Postgres RLS Stripe Resend Sentry PostHog Vercel

Nexural Website

Public product surface for Nexural: fintech/trading brand, pricing, product education, proof, and trading cockpit positioning.

Next.js TypeScript Trading UX Product Design Vercel AI Product Copy Fintech

Landing Zone Guardrails

AWS multi-account foundation focused on guardrails, auditability, least privilege, cost controls, and CI-gated infrastructure changes.

Terraform AWS Organizations IAM SCPs OIDC Security Scanning Cost Controls CI/CD

AI, Apps, ML, Cloud

AI Applications

AI agents and copilots
RAG-powered internal tools
LLM workflow automation
Voice and support assistants
Approval queues and human review
AI quality and evaluation gates

Machine Learning

Trading signal research
Feature engineering
Regime classification
Monte Carlo simulation
Walk-forward validation
Overfitting detection

Cloud Platforms

AWS landing zones
Supabase/Postgres systems
Vercel app delivery
Terraform infrastructure
CI/CD release gates
Observability and audit trails

App Engineering

Next.js applications
FastAPI services
Client portals
Admin dashboards
Stripe billing flows
Production test coverage

Tech Stack Wall

Languages, App Frameworks, And APIs

AI, ML, Data, And Quant Research

Cloud, Data, Payments, And DevOps

Testing, Security, And Observability

Product Ecosystem

Trading And Fintech

Product	Focus
Nexural	Trading cockpit, research stack, execution workflow
Nexural Automation	NinjaTrader analytics, backtest diagnostics, AI strategy review
AlphaStream	ML trading signals, technical indicators, research tooling

AI And Apps

Product	Focus
Sage Ideas	AI-native studio and client operating platform
Jobpoise	AI job copilot, automation, paywall workflows
Trayd	AI companion concept for field-service/trades workflows
Vision Agents	Real-time multimodal/video AI experimentation

Cloud And Quality

Project	Focus
Landing Zone Guardrails	AWS foundation, guardrails, auditability, cost controls
Security Testing Suite	OWASP, API security, secrets detection
Performance Testing Framework	Load, stress, spike, endurance testing

Engineering Proof

Automation Frameworks

Repo	Built For
E2E Framework	Browser automation with page objects, retries, screenshots, reports
API Testing Framework	FastAPI app + API testing client with auth and assertions
Visual Regression Testing Suite	Percy/Selenium visual diff coverage across breakpoints
Contract Testing Framework	Consumer-driven API contracts and service verification
Mobile Testing Framework	Mobile QA automation patterns

Cloud And Platform Repos

Repo	Built For
CloudEngLibrary	Cloud engineering reference library
Terraform Cookbook	Terraform examples and infrastructure patterns
K8 Examples	Kubernetes deployment and operations examples
Docker Compose	Local orchestration patterns
finops-toolkit	Cloud cost and FinOps tooling

Operating Principles

Research Before Claims

Trading systems need clean data, realistic costs, walk-forward validation, regime awareness, and explicit anti-overfit checks before any result deserves attention.

Apps Before Slides

The work should become a usable product: admin dashboards, portals, APIs, billing, auth, observability, and deployment pipelines.

Cloud With Controls

Infrastructure should ship with least privilege, CI gates, audit logs, budget awareness, rollback paths, and security scanning from the first commit.

GitHub Dashboard

Work With Me

I build AI-native apps, trading tools, cloud foundations, and automation systems that move from idea to production.