Olivier Rousseau-Guyot

Senior Full-Stack Developer

• Full-stack product work across multiple services on a React, Node.js and Python stack
• Built the multi-platform partner SDKs for notification-driven accommodation discovery (iOS, Android, Flutter, Capacitor)
• Owned developer experience: reusable GitHub Actions, shared lint/build standards, in-house feature-flag libraries for Node and Python, and the onboarding program
• Integrated a major retail ecommerce system into the affiliation platform: report ingestion, dbt/Snowflake pipelines, and ML scoring of partners
• Ran the Go services at the edge (APIs, static rendering via headless Chrome, monitoring daemons on micro edge-nodes) plus Terraform/CDK8s infrastructure
• Wrote MCP servers and AI agent skills so partners can onboard Stay22 from their own Claude Code / Codex setups

Senior Full-Stack Developer

• Full-stack React, Node.js and Python, with a heavily customized Mantine design system and input on UX decisions
• Built the auth and security layers over Firebase, MySQL and Postgres
• tRPC across the Node layer and the React frontend; release automation where an LLM writes the changelog

Founder & Full-Stack Developer

• Built a financial tracking app (Deno, Svelte, TypeScript) from scratch, handling DevOps, DB design, and full-stack development
• Scaled to 200+ users at under $1/month; integrated OpenAI for financial counseling features

Senior Software Engineer

• Built the internal libraries behind Shopify Payments' form flows: legal, banking, business-details and ownership-verification variants
• Heavily tested, production-deployed, security-first React and Node.js
• Trained other developers and set the code-quality bar on the team

Senior Frontend Tech Lead

• Led the frontend of the World Series of Poker game: React-Redux, Pixi.js canvas rendering, three.js, webpack
• Scrum Master: releases, architecture, TeamCity CI/CD
• Wrote the custom ESLint/TypeScript/VS Code config the whole team ran under

Frontend Tech Lead

• White-label software marketplace and CMS (Backbone, Marionette, Tomcat, Wicket, Spring, MySQL)
• Frontend Tech Lead and the one who built out the India office: trained engineers across the company on QA, Git, Java and JavaScript so the team worked the same way everywhere
• Built the Node.js proxy server and CLI that automated company-wide tasks; contributed the AngularJS module for LDAP users and roles

Frontend Developer

• Vanilla JavaScript dashboards that had to work in IE7; Splunk frontend reverse engineering
• Led JavaScript training and code reviews company-wide
• Certified in trading, business process and anti-corruption

Full-Stack Developer

• Developed Java 6–8 software (SWT, Vaadin, GWT, Spring, Tomcat) for ticket-selling platforms
• Maintained the Ticketpro website (PHP/Java) and led frontend for Festival International d'été de Québec 2013

Technical Support / Integration & Backend Developer

• Technical support at Vidéotron (2009–2011), followed by integration and backend development at Vidéotron & Québecor (2011–2013)
• Supported residential phone, cable, digital TV, and Internet services; optimized chat applications, improving operational effectiveness by 20% across 200+ employees
• Managed enterprise integration using Software AG (Trading Network, Integration Server 6.1–8.2) across Dev/Test/Prod environments
• Integrated Java/C with SQL Oracle, ESB, EAI, and Broker; designed and supported business processes
• Built an internal tool to centralize IT operations and generate department activity reports

Designed and built two client websites plus an internal admin tool (PHP).

Full-Stack Developer

Open-source stack on home-hosted Linux servers: PHP 4 & 5, MySQL, Oracle, Python, jQuery and HTML5.

Help desk and technician dispatch on Solaris, Oracle and American Airlines' SABRE systems.

Alarm system support: monitoring, 911 dispatch, and phone troubleshooting of installations.

Indie Game Developer

Four years of Blitz3D/BlitzMax/Dark Basic Pro games, plus web game portals in JavaScript, MySQL and PHP. Where the full-stack habit started.