Senior Test Automation Engineer - Kafka & API Testing

Capgemini; Greater London; Hybrid; GBP 85,000 - 135,000; Full time

Job summary

Capgemini in London is seeking a Senior Test Automation Engineer specializing in Kafka and API testing. You will design and maintain automation across APIs, microservices and event-driven platforms within an Agile team, ensuring quality through shift-left practices and CI/CD.

Youll build Kafka testing frameworks, validate contracts with JSON Schema/AJV, and deliver clear test reporting with Allure. Collaboration with developers to promote TDD/BDD is essential.

Qualifications

• Strong hands-on experience in test automation across APIs, microservices, distributed systems and event-driven architectures.
• Proficiency with Jest, TypeScript, Playwright, JUnit and Gradle.
• Experience testing Apache Kafka including topic seeding, lag monitoring, replay and resilience.
• Expertise in contract testing, API validation, JSON Schema and AJV.
• Experience with CI/CD, quality gates, reporting and release validation.
• Understanding of TDD, BDD, mocking and shift-left quality engineering.
• Familiarity with Java and Spring Boot applications to support test automation.
• Experience with Docker, Docker Compose and GitLab CI/CD pipelines.
• Experience testing OPA Rego policy engines and IAM testing frameworks.
• Exposure to regulated environments (Banking/FS/Insurance/Public Sector).

Responsibilities

• 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 for event streams, consumer behavior, lag management and replay scenarios.
• Validate event contracts and payloads using JSON Schema, AJV and contract testing methodologies.
• Design and execute performance, load and scalability tests for policy evaluation and event ingestion platforms.
• Automate testing for identity, authentication, authorization token lifecycle, revocation and fail closed security scenarios.
• Integrate automation suites into GitLab CI/CD pipelines with quality gates, automated reporting and deployment readiness checks.
• Create and maintain clear test reporting using Allure or equivalent reporting frameworks.
• Collaborate with developers to promote TDD, BDD, specification by example and defect prevention practices.
• Support continual improvement of testability, observability and quality across the platform.

Skills

API testing

Test automation

CI/CD

TDD/BDD

Shift-left testing

Distributed systems

Agile delivery

Collaboration with developers

Performance testing

Tools

Jest

TypeScript

Playwright

JUnit

Gradle

Kafka

JSON Schema

AJV

Docker

GitLab CI/CD

Allure

Job description

Capgemini in London is seeking a Senior Test Automation Engineer specializing in Kafka and API testing. You will design and maintain automation across APIs, microservices and event-driven platforms within an Agile team, ensuring quality through shift-left practices and CI/CD.

Youll build Kafka testing frameworks, validate contracts with JSON Schema/AJV, and deliver clear test reporting with Allure. Collaboration with developers to promote TDD/BDD is essential.