Alexandre Gaudencio

About

Senior fullstack engineer, ~10 years in. Backend-heavy but I happily switch to the frontend side too.

At Dotfile (KYC/compliance), I led multi-vendor search orchestration for unified entity lookups across data providers per country, built an LLM-driven document auto-purchase system for KYB procurement, eliminated per-schema PostgreSQL isolation across 4 backend apps, and drove a Yarn 4 migration targeting 80%+ CI build-time reduction.

At Amusoire, I was the first engineer — owning a NestJS backend, two Next.js frontends, and a Capacitor/Swift mobile client for a real-time game product.

At Slite (YC) for ~5 years, I built the OAuth2 public API, drove the company-wide TypeScript migration, and rebuilt the permissions model from scratch using recursive CTEs and window functions to 10x performance.

Mentoring, TypeScript, NestJS, PostgreSQL, React, GraphQL, async/event-driven systems (SQS, Redis Pub/Sub), Hexagonal architecture, CI/DX infrastructure, and test-architecture.

Remote from Lyon, France. I like real ownership, hard backend problems, and products that ship to humans. Spaceships welcome 🚀, let's ship!

TypeScript · NestJS · React · PostgreSQL · ex-Slite (YC) · now moving things @ Dotfile

Skills

• TypeScript
• PostgreSQL
• Node.js
• React
• NestJS
• Next.js
• GraphQL
• AWS
• SQS
• Redis Pub/Sub
• Hexagonal architecture
• CI/DX
• Test architecture
• Mentoring

Experience

• Senior Fullstack Engineer

  Sep 2025 – Present

  Dotfile · Remote · Lyon, France

  Senior fullstack engineer at Dotfile (KYC/compliance). NestJS, TypeScript, PostgreSQL, React, AWS. Leading multi-quarter initiatives across the platform.

  • 🌍 Multi-vendor company-data orchestration: designed "Deep Search", the architecture that fans out entity lookups across third-party registries per country. Onboarded Charity Commission (GB), Topograph, Companies House document orders, and InfoCamere (IT) end-to-end.
  • 🤖 AI document auto-purchase: LLM-driven matching that automates KYB document procurement from multiple vendors at template configuration time.
  • 🧠 Dotfile Autonomy: moved AI agents from hard-coded behavior to workspace-configurable policies, with action permissioning and Langsmith trace observability.
  • ⚡ Platform-wide bulk actions: async batch operations (SQS workers, Redis Pub/Sub, React multi-select UI) across every entity type, including AI-driven compliance reviews.
  • 🧪 Test & CI overhaul: eliminated per-schema PostgreSQL isolation across 5 backend apps; drove Yarn 4 + nx-affected fixes for 80%+ CI build-time reduction.
  • 🎨 Console UX redesign: shipped redesigned toasts, alerts, risk-level, case header; progressed Chakra-UI removal from the navigation shell.
  • 🛠 Reliability & security: fixed a production deadlock on document-check resolution, migrated Lambdas to async handlers, parameterized raw SQL in expired-check restoration.

• Senior Full Stack Engineer

  Sep 2023 – Jul 2025

  AMUSOIRE · Remote · Lyon, France

  Joined as Amusoire's first software engineer. Owned the software side of the flagship game end-to-end across backend, web, mobile, and infra.

  • 🛠 NestJS backend: REST API powering the entire product.
  • 🌐 Two Next.js frontends: REST + WebSocket real-time communication.
  • 📱 Mobile client: Capacitor + Swift, used by players to interact with the game live.
  • 🚀 Infra & DX: owned deployment workflows, end-to-end testing strategy, and internal tooling/docs to keep the team fast as it grew.
  • 🎯 Product partnership: collaborated directly with non-technical teams on design and scoping from day one.

• Senior Software Engineer

  Jan 2018 – Apr 2023

  Slite · Remote

  Joined Slite (YC) as a backend-focused engineer. Stayed 5+ years through Series A, owning some of the most load-bearing parts of the product.

  • 🔌 OAuth2 public API: designed and built Slite's full public API during YC; foundation for every Slite integration since.
  • 📘 Company-wide TypeScript migration: drove the backend migration end-to-end (2020); fully shipped by the time I left.
  • 🔐 Permissions system rebuild: rearchitected from scratch using recursive CTEs, window functions, and partial materializations. Still powers Slite's permissions ~5 years later.
  • 🛠 Backend platform & DX: built internal libraries, helpers, and abstractions that let any engineer ship features A-to-Z on the backend.
  • 👥 Mentoring: architecture and design reviews across PRs, calls, and long-form internal docs.

Languages

• English Native or bilingual proficiency
• French Native or bilingual proficiency
• Portuguese Native or bilingual proficiency
• Spanish Elementary proficiency