Senior Test Automation Engineer

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 our peers 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   
• Expleo Academy - 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