Software Tester

2 weeks ago


London Area, United Kingdom Haystack Full time £44,400 - £77,200 per year

Backend Senior Tester (Python / API Automation)


London (Hybrid – 2 days per week in office)


£370 per day (Contract)

About the Role

We're looking for an experienced
Backend Senior Tester
to join a dynamic engineering team in London. This is a hands-on individual contributor role, ideal for someone who takes full ownership of testing delivery and thrives in a fast-paced Agile environment.

You'll be responsible for designing, executing, and maintaining
API automation tests
using
Python and Pytest
, ensuring the reliability and performance of complex backend systems.

Key Responsibilities

  • Lead backend testing efforts, taking full ownership of deliverables.
  • Develop and maintain automated test scripts using
    Python
    and the
    Pytest framework
    .
  • Perform
    API automation testing
    — sending and validating API requests, responses, and data comparisons.
  • Use
    Postman
    for manual and exploratory API testing.
  • Collaborate closely with developers and product owners during
    scrum calls
    , providing clear updates and raising issues proactively.
  • Ensure high-quality standards and efficient release cycles through rigorous validation and reporting.

What You'll Bring

  • 6–8 years of testing experience, ideally focused on backend and API automation.
  • Strong hands-on proficiency with
    Python
    and
    Pytest
    .
  • Proven experience writing and executing API tests (requests, responses, comparisons).
  • Experience using
    Postman
    for functional and exploratory testing.
  • Excellent communication skills and the confidence to lead discussions, raise queries, and clarify requirements in an Agile setup.
  • Self-driven, detail-oriented, and comfortable working independently.

The Offer

  • Contract:
    £370/day (Inside IR35).
  • Location:
    Hybrid – 2 days per week in the London office.
  • Environment:
    Collaborative, Agile, and delivery-focused engineering culture.


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