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I'm Daniel Chen, a Python developer focusing on web scraping, API reverse-engineering, and real-time data processing across major e-commerce and second-hand marketplaces. I build reliable scrapers that handle dynamic JavaScript-rendered content, CAPTCHA challenges, and anti-bot protections, using rotating proxies and API bypass services to keep data flowing at scale. I deliver reliable, near real-time alerts by integrating Telegram bots, webhooks, and email notifications, with data stored in MySQL, PostgreSQL, and MongoDB. I'm ready to start with a free demonstration on one of the target marketplaces to show a working, real-time alert before you commit.…I'm Daniel Chen, a Python developer focusing on web scraping, API reverse-engineering, and real-time data processing across major e-commerce and second-hand marketplaces. I build reliable scrapers that handle dynamic JavaScript-rendered content, CAPTCHA challenges, and anti-bot protections, using rotating proxies and API bypass services to keep data flowing at scale. I deliver reliable, near real-time alerts by integrating Telegram bots, webhooks, and email notifications, with data stored in MySQL, PostgreSQL, and MongoDB. I'm ready to start with a free demonstration on one of the target marketplaces to show a working, real-time alert before you commit.

Daniel Chen

Web Developer, Programmer, Data Scraping Specialist, +3

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I'm Daniel Chen, a Python developer focusing on web scraping, API reverse-engineering, and real-time data processing across major e-commerce and second-hand marketplaces. I build reliable scrapers that handle dynamic JavaScript-rendered content, CAPTCHA challenges, and anti-bot protections, using rotating proxies and API bypass services to keep data flowing at scale. I deliver reliable, near real-time alerts by integrating Telegram bots, webhooks, and email notifications, with data stored in MySQL, PostgreSQL, and MongoDB. I'm ready to start with a free demonstration on one of the target marketplaces to show a working, real-time alert before you commit.…I'm Daniel Chen, a Python developer focusing on web scraping, API reverse-engineering, and real-time data processing across major e-commerce and second-hand marketplaces. I build reliable scrapers that handle dynamic JavaScript-rendered content, CAPTCHA challenges, and anti-bot protections, using rotating proxies and API bypass services to keep data flowing at scale. I deliver reliable, near real-time alerts by integrating Telegram bots, webhooks, and email notifications, with data stored in MySQL, PostgreSQL, and MongoDB. I'm ready to start with a free demonstration on one of the target marketplaces to show a working, real-time alert before you commit.

Available to hire

I’m Daniel Chen, a Python developer focusing on web scraping, API reverse-engineering, and real-time data processing across major e-commerce and second-hand marketplaces. I build reliable scrapers that handle dynamic JavaScript-rendered content, CAPTCHA challenges, and anti-bot protections, using rotating proxies and API bypass services to keep data flowing at scale.

I deliver reliable, near real-time alerts by integrating Telegram bots, webhooks, and email notifications, with data stored in MySQL, PostgreSQL, and MongoDB. I’m ready to start with a free demonstration on one of the target marketplaces to show a working, real-time alert before you commit.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Language

Javanese

Advanced

English

Fluent

Work Experience

Freelance Python Scraping & Data Engineer at Independent

January 1, 2021 - Present

Designed and delivered Python-based scrapers for 10+ e-commerce and marketplace clients, covering platforms with public APIs, private APIs, and fully JavaScript-rendered content. Reverse-engineered website structures and undocumented API endpoints on platforms with no public API, extracting real-time listing data reliably and at scale. Used rotating residential and datacenter proxy pools across all scraping projects to prevent IP blocks, bypass geo-restrictions, and sustain uninterrupted data collection. Implemented CAPTCHA bypass workflows using automation scripts and third-party API services (2Captcha, CapSolver), maintaining uninterrupted scraping across protected platforms. Built iFrame-aware scrapers using Selenium and Playwright to handle embedded content, shadow DOM elements, and multi-frame page structures. Engineered real-time alert pipelines delivering new listing notifications via Telegram bots, webhooks, and email within seconds of data capture. Stored and managed aggregate

Backend Developer (Python /Java) at TechNova Solutions

January 1, 2019 - January 1, 2021

Developed backend data ingestion and processing pipelines in Python and Java, integrating third-party APIs and internal data sources. Built HTTP request handling layers with retry logic, session management, header spoofing, and proxy integration to interact reliably with external services. Designed database schemas and optimized queries across MySQL and PostgreSQL for high-volume data storage and retrieval. Collaborated on real-time data monitoring features, contributing to notification systems with low-latency alert delivery.