Senior Test Automation Engineer

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), 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

• 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.

• 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