TonySt. Pierre
Senior Secure Software Engineer
Maine, USA
Secure systems. Clear thinking. Work that holds up.
I design secure, dependable software across web, mobile, and cloud.
TypeScript, React, Next.js, React Native, AWS, security, CI/CD
Shared platform architecture
Profile
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.
Core capabilities
Platform Architecture
- TypeScript monorepos
- shared application and domain layers
- multi-tenant architecture
- platform-specific boundaries
- reusable systems without forced abstraction
Web and Mobile
- TypeScript
- React
- Next.js
- React Native
- responsive web applications
- production iOS and Android applications
Cloud and Identity
- AWS
- Amazon Cognito
- MFA
- OTP authentication
- remembered devices
- session management
- migrated-user recovery
- security-sensitive account flows
Security, Quality, and Delivery
- CI/CD
- automated testing
- security analysis
- SonarCloud
- Snyk
- OWASP ZAP
- penetration-testing remediation
- Playwright
- mobile signing
- beta distribution
- production releases
Regulated Product Systems
- KYC onboarding
- investment and redemption flows
- money movement
- recurring investments
- account management
- Plaid
- Dwolla
- security controls around sensitive financial changes
Applied AI and Automation
- Python
- agentic workflows
- structured outputs
- workflow orchestration
- local-first systems
- research and automation pipelines
Technical Leadership
- architecture decisions
- code review
- mentoring
- developer guidance
- cross-functional delivery
- translating product and security requirements into maintainable systems
Selected systems experience
Shared Application Architecture
Created a shared TypeScript application layer spanning Next.js and React Native while preserving the boundaries and behavior each platform required.
Production Mobile Platforms
Launched production React Native applications for iOS and Android, replacing packaged mobile web with maintainable native delivery.
Multi-Tenant Systems
Built a multi-tenant platform supporting three distinct products from one codebase while preserving branding, content, features, analytics, legal requirements, and platform behavior.
Identity and Security Modernization
Modernized identity flows with Amazon Cognito, MFA, OTP, remembered devices, migrated-user recovery, session management, and protections around sensitive account changes.
Automated Web and Mobile Delivery
Established automated delivery across web and mobile, including testing, security analysis, environment deployments, signing, beta distribution, and production releases.
AWS certifications
Amazon Web Services
AWS Certified Solutions Architect – Professional
Issued June 2026
Amazon Web Services
AWS Certified Solutions Architect – Associate
Issued March 2026