Leoncio Jr Coronado

I design and build production-grade data automation systems that collect, monitor, and transform web data into clean, reliable outputs for reporting, analytics, and operations.

My work includes:
• Web scraping & monitoring systems (change detection, scheduled crawlers)
• Data pipelines & ETL workflows (cleaning, validation, normalization)
• Reporting and document automation (PDF generation, struc

I build production-grade data automation systems that monitor, extract, and transform web data into clean, structured, business-ready outputs.

My work focuses on:
• Web data extraction & monitoring (change detection, scheduled crawlers)
• Data pipelines & ETL workflows (cleaning, normalization, validation)
• CRM-ready and analytics-ready datasets
• Distributed crawlers for JavaScript-heavy websit

Designed, built, and published 12 public Apify Actors for web extraction, monitoring, lead generation, and data-cleaning workflows. Built and ran Dockerized automation workloads as part of Actor deployments. Implemented output schemas, structured error handling, and deterministic CSV/JSON outputs. Achieved over 99% successful runs through reliable, retry-safe logic and controlled request behavior.

Freelance Data Automation & Web Scraping Specialist
Mar 2023 – Present | Remote

• Built and maintained production-grade web scraping and data automation systems using Python, Playwright, Scrapy, and Selenium
• Designed scalable scraping pipelines with retries, monitoring, and error recovery for long-running workflows
• Developed ETL pipelines for data cleaning, validation, normalization, and CRM-

Designed and maintained automation systems that run unattended with retries, logging, and monitoring. Built resilient pipelines for dynamic websites using stable selectors, DOM rendering, and API inspection. Implemented data validation and duplicate prevention to ensure clean, reliable outputs. Diagnosed and resolved production issues including data drops, blocking signals, and partial failures. D

I specialize in building automated data and e-commerce pipelines using Python (Scrapy, Playwright, Selenium, Pandas), transforming raw online data into CRM-ready and Shopify-ready datasets for business teams.

• Lead Generation (PromoProfits) – Developed an Apollo.io → GoHighLevel (GHL) cleaning pipeline with B2C-only compliance, deduplication, E.164 phone formatting, and email syntax checks to en

Web Scraping & Data Infrastructure Specialist
Sep 2024 – Dec 2025 | Remote

• Designed and operated distributed crawlers for JavaScript-heavy websites using Python, Playwright, Selenium, and Scrapy
• Built monitoring-first scraping architectures with fallback reporting when access was partially blocked
• Deployed and maintained multiple public Apify Actors with 97%+ run success and real users
• Im

Jun 2026