Principal Test Automation Engineer in Liverpool

We are looking for a passionate Principal Test Automation Engineerto help us drive our organisations approach to automated testing across all development squads. This is a hands-on technical role where you will be building the framework yourself, in our codebase where you will work along side the squads who use it.

You will be working within a cross functional team where you’ll build a containerised testing framework that creates isolated infrastructure for each test run. You’ll define CI/CD test strategies, introduce contract testing to reduce reliance on end-to-end tests, and establish enforceable standards that development squads can confidently adopt

Role:Principal Test Automation Engineer

Location:Liverpool City Centre HQ / Hybrid (3 days in office)

Salary: £70,000 - £80,000 (dependent on experience)

Working Hours:37.5 hours per week, Monday to Friday

What you will be doing:

• Design and build the shared test harness. Ephemeral infrastructure per test run, test data seeding and teardown, third-party stubbing, database and message assertion probes. Ship it as a versioned package squads consume rather than fork

• Define how we classify tests by what they touch, and settle what belongs in CI and what belongs in CD

• Establish the patterns for component, contract, API, end-to-end, UI, regression and performance testing, each with a working reference implementation in our own codebase

• Own test data. Seeding through UI automation, API calls and direct database writes, with isolation that makes parallel execution safe

• Design the quality gates in our Azure DevOps pipelines, and own how fast and how reliably tests run, including the flaky test problem

• Work inside squads, pairing and reviewing, so teams get self-sufficient rather than dependent on you

• Be the escalation point when a squad is stuck on test engineering

• Lead root cause investigation into production incidents and test flakiness, and make sure what you find is covered by regression afterwards

• Keep the conventions and agent instruction files current so AI coding tools extend the framework consistently rather than inventing their own patterns

• Represent quality engineering in architecture and design forums, as a peer to Tech Leads and Principal Developers

• Own the automation metrics that matter, and use them to drive an improvement backlog rather than to report status

Our Tech Stack:

• Backend: xUnit, WebApplicationFactory, Testcontainers for .NET, WireMock.Net, MassTransit Test Harness, Respawn, Bogus, Verify

• Web and Mobile: Playwright with TypeScript, Maestro, Vitest, React Testing Library, Mock Service Worker

• Testing (cross-cutting): Postman, Pact for contract testing, axe-core for accessibility, k6 and NBomber for load and performance, SonarCloud quality gates

• Infrastructure: Azure, Docker, Kubernetes (AKS), Nginx, RabbitMQ, Azure Service Bus

• Tooling and Practices: Azure DevOps, Git, CI/CD pipelines, Agile methodologies

What we are looking for:

• Senior or Principal-level experience in test automation or quality engineering, where you built the framework rather than worked within one somebody else built

• Strong TypeScript and Playwright. Maestro or similar for mobile

• Working proficiency in C# and .NET. You'll be writing component and integration tests against our microservices with xUnit or NUnit, and seeding test data through domain code rather than raw SQL

• Docker and containerised test environments, including standing up infrastructure per test run with Testcontainers or equivalent

• Service virtualisation and HTTP stubbing, using WireMock or similar, to test a service in isolation

• Experience testing event-driven systems. Asynchronous messaging, eventual consistency, and asserting on published messages. We run RabbitMQ and Azure Service Bus through MassTransit

• Contract testing between services with Pact or equivalent, covering message schemas as well as HTTP

• Test data management across UI, API and database, with isolation that supports parallel runs, and synthetic or anonymised data throughout

• SQL Server, including database-level assertions and a realistic view of how schema change affects a test suite over time

• CI/CD pipeline and quality gate design, ideally in Azure DevOps

• Authentication in automated tests. Token acquisition, Entra ID, and sensible handling of test credentials

• A track record of bringing other engineers on through pairing and code review

• Able to influence technical direction across squads without having authority over them

Grow with Acorn

AtAcorn Insurance,we’reproudofour Liverpool roots — and even prouder of how farwe’vecome. As part of theAcorn Group, we bring over 40 years of specialist insuranceexpertiseto the table. From humble beginnings,we’vegrown into a national leader, now employing1,700+ people across the UKandreached a milestone £750 millionin total value of insurance policies written in 2024.

We’regrowing fast, with new opportunitiesemergingevery week.That growth islargely dueto the values we share:

• We run through walls for our customers and each other

• We challenge the status quo

• We succeed when we help those around us succeed

• We decide quickly when the smart thing to do is use our judgement

Benefits:

• A maximum of35 days’ holiday(dependingon role and tenure)including bank holidays,withadditionalbuy/sell options

• 24/7 mental health support& free counsellingavailable

• Grow with us:Through career fairs, leadership programs, and learning on the go!

• Flexible benefits, includingearly accesstosalaryviaour internal platform

• Hybrid working optionsto support work-life balance and individual needs

• Recognition awards, social events & more

• Mindful Employer– championing mental health andwellbeing

• Disability Confident Level 1 & 2– creating accessible, inclusive opportunities

• Menopause Friendly accredited– supporting every stage of life

• Armed Forces Covenant signatory– honouring those who serve

• Armed Forces Defence employer recognition scheme- Supportingthose who serve

• Great Places to Work2024/25– fostering an engaging and positive workplace culture

• Best Place to Work for Development– proud to be investing in people’s future

• Best Place to Work for Women– breaking down barriers to women's career progression

Our Commitment to ourcolleague’s:

Thesearen’tjust words —they’rethe principles we live by. Andwe’reproud to back them up with real action, earning recognition and accreditation from leading organisations that share our commitment to people and growth:

• Mindful Employer– championing mental health andwellbeing

• Disability Confident Level 1 & 2– creating accessible, inclusive opportunities

• Menopause Friendly accredited– supporting every stage of life

• Armed Forces Covenant signatory– honouring those who serve

• Armed Forces Defence employer recognition scheme- Supportingthose who serve

• Great Places to Work2024/25– fostering an engaging and positive workplace culture

• Best Place to Work for Development– proud to be investing in people’s future

• Best Place to Work for Women– breaking down barriers to women's career progression

A Few Things to Know Before You Apply

We’rereally excitedthatyou’reconsidering joining Acorn! To help everything go smoothly, here are a couple of things to keep in mind:

If your application is successful, we willcommencerelevant employment checks prior to youcommencingemployment with us. These will include a standard criminal record check and an insolvency register check.

Visa Requirements
Becauseour training is quitecomprehensive,we can only consider applicants who haveat least one yearremainingon their Graduate or Post-Study Work visa.At the moment,we’renot able to offer visa sponsorship.

We’reHere to Support You
We’recommitted to creating an inclusive, supportive workplace where everyone canflourish. If you need any adjustments during the recruitment process—or onceyou’repartof the team—just let us know. Whetherit’sflexible hours, adapted equipment, or a bit of extra support,we’llwork with you to make sure you can do your best work.

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