Senior QA Automation Engineer

Client Server Limited; Greater London; Hybrid; GBP 81,000 - 99,000; Full time

Benefits offered by this job

Remote working

Career growth opportunities

Hybrid work model

Job summary

Client Server Limited is seeking a Senior QA Automation Engineer (Playwright) in London with hybrid working. You will own automated testing for a complex real-time trading platform that processes data across multiple systems and APIs.

You will build automated coverage from scratch, work with stakeholders to define acceptance criteria, and review Claude AI outputs to ensure testing accuracy and reliability.

Qualifications

• Experienced QA engineer with strong Playwright test automation skills.
• Comfortable working with APIs, complex data flows and multiple systems.
• Degree in a STEM discipline from a top-tier university.

Responsibilities

• Own automated testing across system integrations and data journeys.
• Establish automated coverage from ground up and define testing strategy.
• Collaborate with stakeholders to capture requirements and acceptance criteria.

Skills

API testing

Playwright

Test automation

Stakeholder management

Education

STEM degree (e.g., Computer Science, Maths, Economics or Physics)

Tools

Claude AI

Job description

Senior QA Automation Engineer (Playwright) London /WFH to £90k

Do you have expertise in test automation within a trading environment?

You could be progressing your career in a hands-on Senior QA Automation Engineer role at a scaling Fintech who have built a highly complex, real-time energy trading platform to revolutionise energy buying for large industrial and commercial users.

This is a senior, highly autonomous QA role with a strong focus on test automation, end-to-end integration and data flows. The core platform uses AI to process unstructured data from multiple document types, extract information and move it through a complex network of internal systems. You'll be responsible for ensuring these integrations and data journeys work accurately, reliably and at scale.

As a Senior QA Automation Engineer rather than focusing purely on testing individual applications, you'll take ownership of testing the connections between systems, with internal integrations predominantly API led and built on a modern data platform. You'll also work with third-party integrations, including fund administrators, where less standardised interfaces can require more sophisticated approaches to data ingestion and testing.

A key part of the role will be establishing automated test coverage from the ground up, bringing structure and best practice to an environment where existing documentation and automation are limited. You'll have significant autonomy to determine the right testing strategy, tooling and approach.

The role is also highly business facing, you'll work closely with stakeholders to understand requirements, define acceptance criteria, support user acceptance testing and ensure the platform meets real operational needs.

Location / WFH:

You'll join the team in the London office three days a week with flexibility to work from home the other two days.

About you:

• You're an experienced QA Engineer with strong Playwright Test Automation skills
• You're comfortable working with APIs, complex data flows and multiple systems
• You use Claude in your day to day activities and can review its output
• You're happy to work autonomously and make the tech decisions
• You have experience of working in a trading / finance environment, with an understanding of financial data and good numeracy skills
• You're collaborative and pragmatic with strong communication and stakeholder management skills
• You are degree educated in a STEM discipline (e.g. Computer Science, Maths, Economics or Physics) from a top tier university e.g. Russel Group / Oxbridge

What's in it for you:

• Salary to £90k
• Remote working
• Impactful role with complex challenges
• Great career growth opportunities as the company scales