Luc Succès
Senior Full Stack Engineer
Full stack engineer with 12+ years building consumer products at scale. Founded multiple venture-backed startups including a YC company. Led engineering teams at Artsy and shipped features to 100M+ users at Spotify. Deep expertise in React, Node.js, GraphQL, and cloud infrastructure. Currently building production AI agents at Blaze — multi-provider LLM runtimes, MCP servers, and the eval harnesses that keep them honest.
Experience
Blaze
May 2023 — PresentCo-Founder & CTO · Remote
- Built and architected an AI-powered fintech platform from zero, scaling payments to 80+ currencies across 40+ countries
- Built an AI CFO agent with 73 tools spanning live banking, payables, receivables, payroll, and accounting data
- Implemented a model-agnostic provider factory with runtime model switching and context-budgeted memory compaction
- Designed guardrails for agent-initiated money movement, gating every write behind user confirmation and capped limits
- Wrote the eval harness that gates each release, covering 66 behavioral scenarios and a 103-turn endurance test
- Raised $1.2M in funding including Y Combinator (S24 batch)
Vercel AI SDK · MCP · Claude · GPT · Gemini · AWS Bedrock · Azure AI Foundry · Google Vertex · TypeScript · Next.js · NestJS · GraphQL · PostgreSQL · AWS · Kubernetes
Seasons
July 2019 — February 2022Co-Founder & CTO · New York, NY
- Architected full platform from scratch: React Native apps, Node.js backend, and PostgreSQL database
- Built fashion rental marketplace from zero to thousands of active users
- Designed inventory management system handling 10,000+ items with real-time availability tracking
- Created recommendation engine using collaborative filtering to increase user engagement by 40%
- Mentored and hired a team of 7 engineers, establishing engineering culture and best practices
- Raised $4.3M from top VCs to build NYC's premier fashion rental platform
React Native · Node.js · PostgreSQL · AWS · GraphQL
Artsy
January 2017 — September 2019Tech Lead / Senior Software Engineer · New York, NY
- Led cross-functional team of 8 engineers building collector tools serving 2M+ monthly users
- Mentored junior and mid-level engineers through code reviews, architecture discussions, and 1:1s
- Built BMW Art Guide partnership feature with location-based show recommendations using React Native
- Created shared React component library adopted by 4 product teams, reducing duplicate code by 60%
- Built auction bidding platform with real-time WebSocket integration processing $100M+ annually
- Implemented server-side rendering for artwork pages, reducing time-to-interactive by 50%
React · React Native · Node.js · GraphQL · Ruby on Rails · PostgreSQL
Often
June 2015 — December 2016Co-Founder & CTO · New York, NY
- Architected entire system from ground up: Swift iOS app, Node.js backend, and MongoDB database
- Built iOS keyboard app reaching 500K+ downloads and #1 in App Store for 72 hours
- Designed backend services handling 1M+ daily API requests with real-time content delivery
Swift · Node.js · MongoDB · AWS
Spotify
June 2013 — June 2015Software Engineer · New York, NY
- Built features for iOS, web, and desktop clients serving 100M+ users
- Developed Radio feature improvements increasing listening session length by 15%
- Implemented A/B testing framework for new feature rollouts across platforms
Objective-C · JavaScript · C++ · Python
YieldMo
June 2012 — May 2013Founding Engineer · New York, NY
- First frontend engineer at YieldMo; architected the entire frontend framework from scratch
- Built high-performance ad serving platform with JavaScript SDK handling millions of impressions daily
- Grew and mentored frontend team from 1 to 5 engineers, establishing coding standards and best practices
JavaScript · HTML/CSS · Python
