Beautifulsoup : href link is undefined

I want to scrap a website, when I reach any <a> tag the link is "job/undefined", I used post request to fetch data from the page.

Post request with postdata in this code :

from bs4 import BeautifulSoup
import requests

headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36"}

postData = {
  'search': 'search',
  'facets[camp_type]':'day_camp',
  'open[choices-made-content]': 'true'}

url = 'https://www.trustme.work/en'
html_1 = requests.post(url, headers=headers, data=postData)

soup1 = BeautifulSoup(html_1.text, 'lxml')
a = soup1.select('div.MuiGrid-root MuiGrid-grid-xs-12 ')
b = soup1.select('span[class="MuiTypography-root MuiTypography-h2"]')
print('soup:',b)

Sample from the output :

<span class="MuiTypography-root MuiTypography-h2" style="cursor:pointer">
    <a href="job/undefined" style="color:#413E52;text-decoration:none">
    Network and Security engineer
    </a>
</span>

EDIT

Part of content is served dynamically so, you have to fetch the jobs hashid via api and then create the link yourself or use the data from JSON response:

import requests

headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36"}
url = 'https://api.trustme.work/api/job_offers?include=technologies%2Cjob%2Ccompany%2Ccontract_type%2Clevel'
jobs = requests.get(url, headers=headers).json()['included']['jobs']

['https://www.trustme.work/job/' + v['hashid'] for k,v in jobs.items()]

To get the links from each job post change your css selector to select your elements more specific, also try to use static identifiers or HTML structure over classes:

.select('h2 a')

To get a list of all links use a list comprehension:

['https://www.trustme.work' + a.get('href') for a in soup1.select('h2 a')]

Example

from bs4 import BeautifulSoup
import requests

headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36"}

postData = {
 'search': 'search',
 'facets[camp_type]':'day_camp',
 'open[choices-made-content]': 'true'}

url = 'https://www.trustme.work/en'
html_1 = requests.post(url, headers=headers, data=postData)

soup1 = BeautifulSoup(html_1.text, 'lxml')
['https://www.trustme.work' + a.get('href') for a in soup1.select('h2 a')]