Looking for a job

Guilherme Serrão

@guilhermeserro

Message

I build AI automation, data pipelines, and interactive full-stack systems for production products.

Portugal

Message

What I'm looking for

I'm looking to build practical AI automation, data, and interactive product systems where I can own technical solutions end to end and solve real operational problems.

At Witty AI, I build autonomous prospecting agents that research, qualify, and enrich B2B sales leads end to end for a production SaaS platform. I also design resilient ingestion pipelines, REST API integrations, and headless-browser scraping systems that handle inconsistent data and layout drift.

I've delivered production web products at Betshot and Playads.io, including responsive React and TypeScript sites, campaign player APIs, interactive branded games, and internal tools that replaced spreadsheet-based operations with typed interfaces.

I also build trading research tools and interactive systems, from walk-forward strategy backtesting dashboards in Python to custom engine logic, state handling, and networked gameplay systems in C#.

Experience

Work history, roles, and key accomplishments

Current

Full Stack & AI Automation Developer

Current

Witty AI

Jan 2025 - Present (1 year 8 months)

Built autonomous prospecting agents that research, qualify and enrich B2B sales leads end to end, integrating LLM features into a production SaaS platform. Designed schema-validated ingestion pipelines with retry and backoff, normalizing inconsistent scraped data for downstream tools.

Python fastAPI PostgreSQL Playwright Web Scraping Data Pipelines REST APIs Docker Linux Git Agile

Full Stack Developer

Betshot

Jan 2025 - Jan 2026 (1 year)

Developed the studio's production website end to end, from content model to responsive build, using React and TypeScript. Designed a generic per-campaign player API on self-hosted Supabase where each game gets its own table automatically, removing per-game setup.

React TypeScript Supabase REST APIs

Developer

Playads.io

Jan 2022 - Jan 2025 (3 years)

Delivered internal tools and scripts that collapsed spreadsheet-based operational flows into a single typed interface, leveraging React, Next.js, and Node.js. Integrated AI into production systems for analysis, collection and organization of data.

React Next.js Node AI Integration Data Analysis C#