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Lucas Flaquer

@lucasflaquer

Senior Full Stack Engineer at 99x building an AI-assisted print-ordering product, with a registration flow that increased companies by 30%.

Brazil

Message

At 99x, I built the NestJS and PostgreSQL backend for Printly, an AI-assisted print-ordering product now in beta. It connects customer chat, a print-shop admin panel, and a RAG assistant, with real-time messaging and hand-off to a human operator.

For SteepRock, I refactored a life sciences SaaS platform’s UI, extracted a reusable Storybook component library, and owned an internal administrative project end to end. I also led the migration from ESLint to Biome.

At Catho, I rebuilt the company registration flow and ran a 15-day A/B test that increased registered companies by 30%. I also implemented server-side rendering in Next.js and set up a CI pipeline for unit and end-to-end tests, coverage, typechecking, and linting.

Across my work, I’ve shipped web products in banking, SaaS, life sciences, and AI-powered products. I use Claude Code in a spec-driven development workflow, and I’m available for remote contractor work with a preference for São Paulo time.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Engineer

Current

99x

Jan 2026 - Present (9 months)

Built the NestJS/PostgreSQL backend orchestrating three applications for an AI-assisted print ordering product, implemented multi-tenant authentication, real-time messaging with SSE, and a dynamic form generated by the RAG.

NestJS PostgreSQL BetterAuth SSE Next.js Tailwind Tanstack Query Biome Testing

Frontend Engineer

99x

Sep 2025 - Jan 2026 (4 months)

Refactored UI with composition pattern, owned an internal admin project end to end, led migration from ESLint to Biome, and coordinated releases with QA teams overseas.

React Material UI Biome Storybook Composition Pattern ESLint

Full-Stack Developer

FCamara

May 2025 - Aug 2025 (3 months)

Contributed to a greenfield forestry funds platform from concept to MVP, built Next.js features and C#/.NET endpoints, integrated Pipefy via GraphQL and WebSockets, and raised test coverage to near 100%.

Next.js C#.NET Python GraphQL WebSockets SonarQube Testing CI CD

Full-Stack Developer

Catho

Aug 2022 - Apr 2025 (2 years 8 months)

Rebuilt company registration flow and ran A/B test resulting in +30% registered companies, implemented SSR in Next.js, built Node.js Lambda functions, and cut frontend test suite time from 3 to 1.5 minutes.