Simon Haïoun-Viet

Product Engineer at a YC-backed (S21) startup building a CRM for recruitment agencies. Working end-to-end in a 3-person team: full-stack development, product research, user interviews, infrastructure, and support.

• Sole frontend developer in the team: owned all user-facing development (landing page, product features) using Next.js 15 and shadcn
• Built an AI-powered semantic search system using pgvector embeddings, now used daily by all recruiters to source candidates for open positions
• Developed an AI notetaker that joins recruiter calls, generates structured summaries, and auto-fills CRM fields, fully replacing manual note-taking
• Architected AI workflows using Mastra and AI SDK for automated data extraction and CRM enrichment
• Created a Node.js/Fastify API from scratch to streamline AI feature development
• Terraformed the entire GCP infrastructure with a colleague, improving deployment reliability
• Implemented observability stack with Datadog: logging, monitoring, alerting on critical paths, and performance dashboards
• Conducted user research and interviews to identify pain points and prioritize product roadmap
• Managed LinkedIn Ads campaigns including creative design, audience targeting, and A/B testing

Frontend Developer on the main website and ATS for Welcome to the Jungle, a leading French recruitment platform with 2M+ monthly visitors.

• Led the homepage redesign to better communicate the company vision and modernize the UI on one of the highest-traffic pages
• Redesigned the job detail page with improved structure (job section, company section) and modern UI, enhancing candidate experience on the most visited page
• Contributed to Welcome UI, the company’s open-source design system used across all products
• Improved developer experience by optimizing hot reload times and dockerizing applications

Frontend Developer, then Tech Lead (last 2 years) on a programmatic advertising platform (real-time bidding system).

• Led the migration of the core platform from AngularJS to Angular 2+, coordinating with the team to modernize the codebase
• Built a React application from scratch for advertisers to create and manage ad creatives
• Developed Node.js APIs to support new platform features
• Terraformed AWS infrastructure improving deployment automation and reliability
• Established frontend best practices as Tech Lead: code review standards, testing strategies, and DX improvements

Web Developer at CGI, a global IT consulting firm. Worked on multiple client projects across different industries.

• Developed EDF’s customer portal for France’s largest electricity company
• Built an intranet application for SNCF Réseau, the French national railway infrastructure manager
• Created a website for French Notaries to digitalize their services