Senior Qa Automation Engineer

Client Server Limited; Greater London; Hybrid; GBP 54,000 - 90,000; Full time

Job summary

Client Server Limited is seeking a Senior QA Automation Engineer (Playwright) to join our London team, mixing office presence with hybrid work from home. The role focuses on test automation across a real-time energy trading platform.

You will own API-led integrations, end-to-end data flows and testing across multiple systems, with significant autonomy to define the testing strategy and tooling while collaborating with stakeholders.

Qualifications

• Experience with Playwright or similar automation frameworks.
• Experience testing APIs and data flows in complex environments.
• Familiarity with trading/finance data is a plus.
• Degree in a STEM discipline from a top university.

Responsibilities

• Lead automated testing across the platform and integrations.
• Own API-led testing and end-to-end data journeys.
• Collaborate with stakeholders to define acceptance criteria and testing strategy.

Skills

Playwright

API testing

QA Automation

Stakeholder communication

Education

STEM degree

Tools

Playwright

Claude

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
• Impactful role with complex challenges
• Great career growth opportunities as the company scales