Senior Test Automation Engineer (Kafka and API Testing)

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

Job summary

Capgemini is seeking a Senior Test Automation Engineer in London to design, build and maintain automated testing solutions for APIs and Kafka-powered event-driven platforms.

Join an Agile delivery team to drive shift-left quality, implement robust testing frameworks and integrate CI/CD with GitLab. The role emphasizes API contract validation, performance testing and end-to-end scenario validation in a hybrid work environment.

Qualifications

• Hands-on test automation across APIs and distributed systems.
• Experience with API validation and contract testing.
• Proficiency in modern testing frameworks and CI/CD integration.
• Familiarity with Kafka-based event streams and resilience testing.

Responsibilities

• Design, build and maintain automated testing frameworks for APIs and Kafka.
• Develop automated test suites using Jest, TypeScript, JUnit, Gradle and Playwright.
• Validate event contracts and payloads using JSON Schema and AJV.
• Plan and execute performance, load and resilience tests for low-latency systems.
• Integrate automation into GitLab CI/CD pipelines and report results clearly.

Skills

API testing

Kafka testing

Performance testing

CI/CD

TDD/BDD

QA automation

Tools

Kafka

Docker

GitLab CI/CD

Allure

Playwright

Jest

JUnit

Gradle

TypeScript

Java

Job description

**Job Title**: Senior Test Automation Engineer (Kafka and API Testing)**Location**: London**About the Job you are considering:**We are seeking a highly skilled Quality Automation Engineer to design build and maintain automated testing solutions that validate platform behavior across APIs event driven architecture’s identity and access management policy decision engines and end-to-end user journeys. This is a handson engineering role embedded within an Agile delivery team with responsibility for driving quality through automation shiftleft testing and continuous integration practices.**Hybrid working**:The places that you work from day to day will vary according to your role, your needs, and those of the business; it will be a blend of Company offices, client sites, and your home; noting that you will be unable to work at home 100% of the time.**Your Role:*** Design develop and maintain robust API contract integration end-to-end performance and resilience testing frameworks* Develop automated test suites using Jest TypeScript JUnit Gradle and Playwright* Build and maintain Kafka testing frameworks to validate event streams consumer behavior lag management replay scenarios and idempotent processing* Validate event contracts and payloads using JSON Schema AJV and contract testing methodologies* Design and execute performance load and scalability tests for policy evaluation services and event ingestion platforms* Automate testing for identity authentication authorization token lifecycle revocation and fail closed security scenarios* Integrate automation suites into GitLab CICD pipelines ensuring quality gates automated reporting and deployment readiness checks* Create and maintain clear test reporting using Allure or equivalent reporting frameworks* Collaborate closely with developers to promote TDD BDD specification by example and defect prevention practices* Support continuous improvement of testability observability and quality engineering standards across the platform**Your Skills:*** Strong handson experience in test automation engineering across APIs microservices distributed systems and event driven architectures* Proficiency with Jest TypeScript Playwright JUnit and Gradle* Practical experience testing Apache Kafka including topic seeding asynchronous validation lag monitoring replay testing and resilience scenarios* Expertise in contract testing API validation JSON Schema and AJV* Experience conducting performance load and resilience testing for lowlatency and high throughput systems* Strong knowledge of CICD quality gates automated test reporting test data management and release validation* Understanding of TDD BDD mocking frameworks specification by example and shiftleft quality engineering* Familiarity with Java and Spring Boot applications to support test automation and service validation* Experience with Docker Docker Compose and GitLab CICD pipelines* Handson experience using AIassisted engineering tools such as Claude Code GitHub Copilot or similar platforms to accelerate test creation and validation.**Desirable (Not Mandatory):*** Experience testing OPARego policy engines and authorization decision services* Knowledge of OAuth 20 OpenID Connect OIDC Ping Identity LDAP and IAM testing frameworks* Experience with Allure reporting quality dashboards and test trend analysis* Familiarity with service mesh architectures API gateways mTLS certificate management and securityfocused testing* Exposure to highly regulated environments such as Banking Financial Services Insurance or Public Sector organizations'.**We are a Disability Confident Employer:**Capgemini is proud to be a Disability Confident Employer (Level 2) under the UK Government’s Disability Confident scheme.As part of our commitment to inclusive recruitment, we will offer an interview to all candidates who:* Declare they have a disability, and* Meet the minimum essential criteria for the role.Please opt in during the application process. **Make It Real (what does it mean for you):*** You’d be joining an accredited Great Place to work for Wellbeing in 2024. Employee wellbeing is vitally important to us as an organisation. We see a healthy and happy workforce a critical component for us to achieve our organisational ambitions. To help support wellbeing we have trained ‘Mental Health Champions’ across each of our business areas, and we have invested in wellbeing apps such as Thrive and Peppy.* You will be empowered to explore, innovate, and progress. You will benefit from Capgemini’s ‘learning for life’ mindset, meaning you will have countless training and development opportunities from thinktanks to hackathons, and access to 250,000 courses with numerous external certifications from AWS, Microsoft, Harvard Manage Mentor, Cybersecurity qualifications and much more.* You will be joining one of the World’s Most Ethical Companies, as recognised by Ethisphere for 13 consecutive years. We live our values by making ethical business choices every day. Working ethically is at the centre of our culture at Capgemini, meaning you will be helping to create a future we can all be proud of.**Why you should consider Capgemini:**Growing clients’ businesses while building a more sustainable, more inclusive future is a tough ask. When you join Capgemini, you’ll join a thriving company and become part of a collective of free-thinkers, entrepreneurs and industry experts. We find new ways technology can help us reimagine what’s possible. It’s why, together, we seek out opportunities that will transform the world’s leading businesses, and it’s how you’ll gain the experiences and connections you need to shape your future. By learning from each other every day, sharing knowledge, and always pushing yourself to do better, you’ll build the skills you want. You’ll use your skills to help our clients leverage technology to innovate and grow their business. So, it might not always be easy, but making the world a better place rarely is.**About Capgemini:**Capgemini is an AI-powered global business and technology transformation partner, delivering tangible business value. We imagine the future of organisations and make it real with AI, technology and people. With our strong heritage of nearly 60 years, we are a responsible and diverse group of 420,000 team members in more than 50 countries. We deliver end-to-end services and solutions with our deep industry expertise and strong partner ecosystem, leveraging our capabilities across strategy, technology, design, engineering and business operations. The Group reported 2024 global revenues of €22.1 billion. Make it real | www.capgemini.com.