A Complete Guide to Web Scraping Job PostingsMonday, August 9, 2021
The online job market has undoubtedly overridden in-person hiring activities. This is especially true when most cities around the globe face rounds of lock-down and more jobs shift to a remote mode since the 2020 covid outbreak. In this sense, web scraping job postings serve not only institutions and organizations but also individual job seekers.
Contents of the Guide on Job Scraping
What's Job Scraping?
Where to fetch job data? Company's career pages, giant big boards like Monster, Glassdoor, or Indeed, personal job aggregator websites, and job portals serving all sorts of niche markets are the important sources for people who are applying job scraping. From all these sources, job scraping can easily get you information such as job title, job description, location and compensation.
How Job Scraping Data Is Used?
According to the report made by Gallup far back in 2017, 51% of employees keep an eye on new opportunities online and 58% of job seekers look for jobs online. In recent years, social media recruiting has become an essential way to seek quality hires as well.
Challenges for scraping job postings
Although job scraping can be extremely helpful in these respects, challenges that lie in the journey may frustrate many.
Gathering Job Data from Multiple Sources
First and foremost, you'll need to decide where to extract this information. There are two main types of sources for job data:
- Major job aggregator sites like Indeed, Monster, Naukri, ZipRecruiter, Glassdoor, Craiglist, LinkedIn, SimplyHired, reed.co.uk, Jobster, Dice, Facebook jobs, and etc.
- Every company, big or small, has a career section on their websites. Scraping those pages on a regular basis can give you the most updated list of job openings.
- Niche recruiting platforms if you are looking for jobs in a certain niche, like jobs for the disabled, jobs in the green industry, etc.
Anti-scraping Techniques That Block Job Scraping
Next, you'll need a web scraper for any of the websites mentioned above.
Large job portals can be extremely tricky to scrape because they will almost always implement anti-scraping techniques to prevent scraping bots from collecting information off of them. Some of the more common blocks include IP blocks, tracking for suspicious browsing activities, honeypot traps, or using Captcha to prevent excessive page visits.
Well, there are still ways to bypass anti-scraping techniques and straighten the thing out.
High Cost for Job Crawlers Building and Maintenance
On the contrary, the company's career sections are usually easier to scrape. Yet, as each company has its own web interface/website, it requires setting up a crawler for each company separately. Such that, not only the upfront cost is high but it is also challenging to maintain the crawlers as websites undergo changes quite often.
For job board builders, difficulties in the data scraping would be even more.
What are the options for job scraping?
There are a few options for how you can scrape job listings from the web.
1. Hiring a web scraping service (Daas)
These companies provide what is generally known as "managed service". Some well-known web scraping vendors are Scrapinghub, Datahen, Data Hero and etc. They will take your requests in and set up whatever is needed to get the job done, such as the scripts, the servers, the IP proxies, etc.
Data will be provided to you in the format and at the frequency required. The charge is based on the number of websites, the amount of data, and the frequency of the crawl. Some companies charge additional for the number of data fields and data storage.
Website complexity is, of course, a major factor that could have affected the final price. For every website setup, there's usually a once-off setup fee and monthly maintenance fee.
2. In-house web scraping setup
Doing web scraping in-house with your own tech team and resources comes with its perks and downfalls.
Web scraping is a niche process that requires a high level of technical skills, especially if you need to scrape from some of the more popular websites or if you need to extract a large amount of data on a regular basis. Starting from scratch is tough even if you hire professionals, these development guys are expected to be well experienced with tackling the unanticipated obstacles.
Owning the crawling process also means you'll have to get the servers for running the scripts, data storage, and transfer. There's also a good chance you'll need a proxy service provider and a third-party Captcha solver. The process of getting all of these in place and maintaining them on a daily basis can be extremely tiring and inefficient.
What's more, the issue of legality shall be considered. Generally speaking, public information is safe to scrape and if you want to be more cautious about it, check and avoid infringing the TOS (terms of service) of the website. Hiring a professional service provider will surely reduce the level of risk associated with it.
3. Using a web scraping tool
Technologies's been advancing and just like anything else, web scraping can now be automated.
There are many helpful web scraping software that is designed for non-technical people to fetch data from the web. These so-called web scrapers or web extractors transverse the website and capture the designated data by deciphering the HTML structure of the webpage. Most web scraping tools support monthly payments ($60 ~ $200 per month) and some even offer free plans that are quite robust.
You'll get to "tell" the scraper what you need through "drags" and "clicks". The program learns about what you need through its built-in algorithm and performs the scraping automatically. Most scraping tools can be scheduled for regular extraction and can be integrated to your own system.
Artículo en español: Una guía completa para las publicaciones de trabajos de web scraping
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