Senior SDET

Brief Description

Company Description:

Resillion helps organisations build technology they can trust. Our work matters because today's digital world is connected and increasingly complex. From software and platforms to devices, media, AI and critical business systems, our teams help clients make sure their products and services work as they should.

We're the only company who combine quality engineering, cyber security, conformance and interoperability, and media content quality control into something we call Total Quality. We combine human insight with advanced AI to deliver solutions that support performance from concept to launch.

Resillion is also a place to grow. We're a team of curious, collaborative experts who care about doing things well. You'll be trusted to bring your ideas, take ownership and keep learning, with support from colleagues across our global business. We value expertise and the different perspectives people bring - creating an environment where you can build a career with confidence.

About The Role

We are looking for a Senior Software Development Engineer in Test (SDET) who approaches quality as an engineering discipline.

This role goes beyond writing automated tests; you will design and build systems that enable scalable, reliable testing, including tools, frameworks, and supporting services that improve how teams validate software.

You will work across multiple layers of the engineering ecosystem, helping teams validate APIs, services, data flows, and user journeys, while building the supporting tooling that makes testing faster, more reliable, and more insightful.

This role is well suited to engineers who enjoy building internal platforms, automation utilities, test harnesses, data tooling, and diagnostic systems, and who are building/leveraging approaches such as AI-assisted testing and intelligent quality tooling.

Key Responsibilities

Engineering for Quality

Design and build engineering solutions that support quality at scale, including:

• Test harnesses for validating services and distributed systems
• Stubs and mocks for isolating dependencies
• Simulation frameworks for testing complex workflows
• Internal tooling that enables developers to validate their systems earlier
  
  

Develop reusable components that allow teams to test services and integrations without relying on full environments.

Test Infrastructure & Tooling

Build and maintain the technical infrastructure that enables effective testing, including:

• Automation frameworks for UI, API, and integration testing
• Test data generation and environment validation tools
• Diagnostics and debugging utilities
• Execution orchestration tools for CI/CD environments
  
  

Develop internal libraries, utilities, and services that improve the reliability and speed of automated validation.

AI-Driven Quality Engineering

Deisng and implement AI-assisted approaches to improving quality engineering, such as:

• AI-assisted test generation
• automated defect analysis
• intelligent test maintenance
• anomaly detection in test results
  
  

Contribute to the development of internal AI-enabled tooling that improves testing efficiency and insight

Observability & Quality Insights

Design and build reporting and analytics capabilities that provide insight into system quality, including:

• Test execution reporting dashboards
• Quality metrics and trend analysis
• Integration with observability platforms
• Defect and reliability analysis tooling
  
  

Leverage data to provide actionable insights into product stability, coverage, and risk.

System-Level Validation

Work across the full system stack to validate behaviour including:

• APIs and service interactions
• Distributed systems and microservices
• Data pipelines and persistence layers
• Integration points between internal and external services
  
  

Investigate failures by analysing logs, metrics, traces, and system behaviour, identifying root causes rather than simply reporting defects.

CI/CD & Engineering Integration

Embed automated validation into development workflows by integrating testing into:

• CI/CD pipelines
• Pull request validation
• environment readiness checks
• deployment verification processes
  
  

Collaborate with platform and DevOps teams to ensure quality checks are automated, scalable, and reliable.

Required Skills & Experience

Software Engineering

Strong development experience in one or more programming languages, such as:

• Java
• Python
• JavaScript / TypeScript
• C#
  
  

Experience designing maintainable, production-quality code used for automation, tooling, or internal engineering platforms.

Test Engineering

Experience Building Automated Validation Across

• APIs and service layers
• integration workflows
• user interfaces (where appropriate)
  
  

Experience With Modern Automation Frameworks Such As

• Playwright
• Selenium / WebDriverIO
• Cypress
• Pytest / JUnit / NUnit
  
  

Engineering Tooling & Test Infrastructure

Experience Building Or Maintaining Engineering Tools Such As

• test harnesses
• mock or stub services
• simulation tools
• test data generators
• environment validation utilities
  
  

Ability to design solutions that enable developers to test systems more effectively.

CI/CD & Platform Integration

Experience Integrating Automated Testing Into Pipelines Such As

• Azure DevOps
• GitHub Actions
• Jenkins
  
  

Familiarity With Modern Engineering Environments Including

• Git-based development workflows
• containerised environments (Docker)
• cloud platforms and distributed systems
  
  

Data & Diagnostics

Experience Working With Databases Such As

• PostgreSQL
• MySQL
• MongoDB
  
  

Ability to investigate issues using logs, queries, and system diagnostics.

Nice to Have

Experience With

• Performance testing tools (k6, JMeter, Locust)
• Observability platforms (Grafana, Prometheus, ELK)
• Container orchestration platforms such as Kubernetes
• Distributed system testing
• AI-assisted development or AI-enabled testing approaches
  
  

What We Value

We are looking for engineers who:

• Enjoy building tools and systems, not just writing tests
• Think about quality at a system and architecture level
• Are comfortable debugging across services, infrastructure, and data
• Take ownership of improving engineering practices
• Continuously look for ways to increase reliability and developer productivity