Senior Test Automation Engineer

Expleo; Greater London; On-site; GBP 70,000 - 100,000; Full time

Benefits offered by this job

ExpleoAcademy

Competitive benefits

Collaborative culture

Job summary

Expleo's Digital Assurance team is seeking a Senior Test Automation Engineer to define and implement robust automation solutions for a key energy trading client. You will design strategies, build automated frameworks in C#/.NET, and ensure quality, reliability and performance of complex data platforms and event-driven systems.

You will work in an Agile environment, integrate tests into CI/CD pipelines, create Gherkin scenarios with SpecFlow, and leverage AI-assisted tooling for test design,

Qualifications

• Proven experience in test automation within Agile environments.
• Strong C# test automation development experience.
• Experience building and maintaining BDD frameworks and behaviour-driven test suites.
• Experience integrating automated regression test packs into CI/CD pipelines.

Responsibilities

• Define test strategies, coverage models and acceptance criteria from functional and non-functional requirements.
• Design, develop and maintain automated test frameworks and regression test suites.
• Develop test automation solutions using C# and BDD methodologies.
• Create and maintain robust Gherkin scenarios and step definitions.
• Determine the balance between manual and automated testing (approx. 70:30 automation-to-manual).
• Integrate automated tests into CI/CD pipelines and development workflows.
• Perform testing of large datasets, data flows and data mappings.
• Execute test cases, analyse results and clearly communicate defects, issues and risks.
• Utilise approved AI-assisted tools to support test design and reporting.
• Collaborate with developers, analysts and stakeholders within Agile teams.
• Drive continuous improvement initiatives while aligning with client standards.

Skills

C#

.NET

ASP.NET Core

SQL

JSON

XML

Tools

Reqnroll / SpecFlow

Microsoft Playwright

WireMock

Postman

Newman

Bruno CLI

Visual Studio

Git

Azure DevOps Repositories

Azure DevOps YAML Pipelines

Apache Kafka (Aiven)

Schema Registry

Avro

JSON Messaging

RabbitMQ

Microsoft SQL Server

OpenTelemetry

ClickStack / HyperDX

ClickHouse

ELK Stack

Job description

Overview

Expleo is seeking an experienced Senior Test Automation Engineer to join our Digital Assurance practice, supporting a key client within the energy trading sector. This role will be responsible for defining and implementing robust test automation solutions, ensuring the quality, reliability and performance of business-critical applications and data platforms.

The successful candidate will combine strong automation engineering capabilities with excellent analytical skills to deliver high-quality testing solutions across complex systems, data integrations and event-driven architectures.

Responsibilities

• Define test strategies, coverage models and acceptance criteria from functional and non-functional requirements.
• Design, develop and maintain automated test frameworks and regression test suites.
• Develop test automation solutions using C# and BDD methodologies.
• Create and maintain robust Gherkin scenarios and step definitions.
• Determine the optimal balance between manual and automated testing, typically operating within a 70:30 automation-to-manual testing approach.
• Integrate automated tests into CI/CD pipelines and development workflows.
• Perform testing of large datasets, data flows and data mappings.
• Execute test cases, analyse results and clearly communicate defects, issues and risks.
• Utilise approved AI-assisted tools to support test design, exploratory testing, automation development, analysis and reporting.
• Critically review and validate AI-generated outputs to ensure adherence to quality, security and development standards.
• Collaborate closely with developers, analysts and business stakeholders within Agile delivery teams.
• Drive continuous improvement initiatives while adhering to the client's development lifecycle and quality standards.

Essential skills

Programming & Platforms

• C#
• .NET
• ASP.NET Core
• SQL
• JSON
• XML

Testing & Automation

• Reqnroll / SpecFlow
• Microsoft Playwright
• WireMock
• Postman
• Newman
• Bruno CLI

Development & Delivery

• Visual Studio
• Git
• Azure DevOps Repositories
• Azure DevOps YAML Pipelines

Event Streaming & Messaging

• Apache Kafka (Aiven)
• Schema Registry
• Avro
• JSON Messaging
• RabbitMQ

Data & Observability

• Microsoft SQL Server
• OpenTelemetry
• ClickStack / HyperDX
• ClickHouse
• ELK Stack (Elasticsearch, Logstash, Kibana)

• Excellent analytical and problem-solving capabilities.
• Strong stakeholder communication and collaboration skills.
• Familiarity with Azure DevOps, TFS, Jira or similar Application Lifecycle Management tools.
• Exposure to observability and monitoring platforms.
• Knowledge of event-driven and microservices architectures.

Experience

• Proven experience in test automation engineering within Agile environments.
• Strong experience in C# test automation development.
• Experience creating and maintaining BDD frameworks and behaviour-driven test suites.
• Demonstrable experience building automated regression test packs and integrating them into CI/CD pipelines.
• Strong SQL skills with experience validating complex data structures and integrations.
• Experience testing APIs, event-driven systems and distributed architectures.
• Experience using AI-assisted engineering and testing tools.
• Experience within energy, utilities or trading environments.
• Experience working within regulated enterprise environments.

Benefits

• Collaborative working environment – we stand shoulder to shoulder with our clients and ourpeers through good times and challenges
• We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects
• ExpleoAcademy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses
• Competitive company benefits
• Always working as one team, our people are not afraid to think big and challenge the status quo

• As a Disability Confident Committed Employer we have committed to:
  • Ensure our recruitment process is inclusive and accessible
  • Communicating and promoting vacancies
  • Offering an interview to disabled people who meet the minimum criteria for the job
  • Anticipating and providing reasonable adjustments as required
  • Supporting any existing employee who acquires a disability or long term health condition, enabling them to stay in work at least one activity that will make a difference for disabled people

“We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”.

We treat everyone fairly and equitably across the organisation, including providing any additional support and adjustments needed for everyone to thrive