Tony St. Pierre.Let’s connect

Tony St. Pierre

Senior Secure Software Engineer

Maine, USA

Built with intention

Secure systems. Clear thinking. Work that holds up.

I design secure, dependable software across web, mobile, and cloud.

Explore my work

Shared platform architecture

An illustration of my engineering approach.A shared TypeScript core connects web, iOS, and Android applications with identity, multi-tenant boundaries, and delivery.

TypeScript / React / React Native / AWS

Product thinking. Systems discipline.

01 / Profile

Tony St. Pierre outdoors
The person behind the systems.

The whole system.
Every detail.

I’m a senior secure software engineer based in Maine. My work sits at the intersection of product engineering and systems architecture: shared TypeScript platforms, web and mobile applications, cloud identity and security, multi-tenant systems, and automated delivery. I value clear boundaries, defensive controls, and software that remains understandable as it grows.

Clear boundariesDefensive controlsLasting clarity

02 / Selected systems experience

From shared core
to production.

Architecture, applications, and the boundaries that keep them dependable.

  1. 01

    Shared Application Architecture

    Architected shared TypeScript systems across web and mobile while preserving platform-specific boundaries.

    • TypeScript
    • Shared domain layers
    • Web + mobile
  2. 02

    Production Mobile Platforms

    Built production React Native applications for iOS and Android with maintainable platform-specific boundaries.

    • React Native
    • iOS + Android
  3. 03

    Multi-Tenant Systems

    Designed multi-tenant application platforms with clear configuration, feature, and policy boundaries.

    • Configuration
    • Policy boundaries
  4. 04

    Identity and Security Modernization

    Built secure identity and access controls spanning authentication, MFA, sessions, and account recovery.

    • AWS
    • MFA
    • Session management
  5. 05

    Automated Web and Mobile Delivery

    Established automated delivery across web and mobile with testing, security analysis, and controlled releases.

    • CI/CD
    • Security analysis
    • Controlled releases

03 / Core capabilities

Depth where
it matters.

Connecting product engineering, security, and delivery.

  • 01

    Platform Architecture

    • TypeScript monorepos
    • shared application and domain layers
    • multi-tenant architecture
    • platform-specific boundaries
    • reusable systems without forced abstraction
  • 02

    Web and Mobile

    • TypeScript
    • React
    • Next.js
    • React Native
    • responsive web applications
    • production iOS and Android applications
  • 03

    Cloud and Identity

    • AWS
    • Amazon Cognito
    • Cloud identity, MFA, session management, and account recovery.
  • 04

    Security, Quality, and Delivery

    • CI/CD
    • automated testing
    • security analysis
    • static and dynamic analysis
    • penetration-testing remediation
    • end-to-end testing
    • controlled releases
  • 05

    Regulated Product Systems

    • Security-sensitive workflows, regulated product environments, and third-party integrations.
  • 06

    Applied AI and Automation

    • Python
    • agentic workflows
    • structured outputs
    • workflow orchestration
    • local-first systems
    • research and automation pipelines
  • 07

    Technical Leadership

    • architecture decisions
    • code review
    • mentoring
    • developer guidance
    • cross-functional delivery
    • translating product and security requirements into maintainable systems

04 / AWS certifications

Built on a
strong foundation.

View credentials

  • Amazon Web Services

    AWS Certified Solutions Architect – Professional

    Issued June 2026

  • Amazon Web Services

    AWS Certified Solutions Architect – Associate

    Issued March 2026

Good work starts with a conversation.

Let’s build something
that holds up.

Connect on LinkedIn A production problem keeps coming back?Explore the Production Problem Investigation Taking responsibility for a production system?Explore the Production Handoff Review

A sign-in, recovery, or onboarding journey keeps failing?

Authentication & Onboarding Diagnosis

Also available for a blocked mobile release

React Native Release Rescue

A Next.js upgrade breaks your build or a critical workflow?

Next.js Upgrade Rescue

Have a pentest report and need help implementing the repairs?

Pentest Remediation