QA SDET (Javascript)

King William Street, London, EC4N 7, United Kingdom Posted on April 10, 2026

Job Description

Job description
The team you';ll be working with:

As a Lead Software Development Engineer in Test (SDET) you will have the opportunity of joining an award winning Quality Engineering team that is working on some of the most cutting edge technologies that is embracing new innovations, such as in built quality checks that embraces AI/GenAI for test automation and predictive analytics. What is key to this role is the ability to lead and inspire a team, fostering a collaborative and productive work environment.This is a hands on role whereby you will lead SDETs and in parallel play a key role in expanding our existing portfolio of Quality Engineering assets and services. Having strong verbal and written communication skills to effectively convey technical information to non-technical stakeholders is a must.

What you';ll be doing:

You will join a highly focused quality engineering team that are experts in driving an engineering led approach to driving value for our clients.
Responsible to ensure Shift-Left Testing emphasising early testing in the development lifecycle. You will have experience of multiple Automation Frameworks that support various types of testing (unit, integration, UI, end-to-end), such as WebdriverIO, Cypress and Playwright. 
Play a key role to mentor and train your team on the latest testing tools and methodologies.
Always look for ways to improve your quality engineering approach and capture the value created through defining and tracking quality metrics such as defect density, test pass rate, and mean time to detect/resolve issues.

What experience you';ll bring:

Extensive experience as a QA Automation Engineer  
Experience of building advanced and feature rich test automation frameworks from scratch using Object-oriented and scripted languages  
Has breadth of experience across different tech-stacks. At least two of the following: JavaScript/TypeScript, Java, C#, or Python, amongst others  
Strong programming foundation in JavaScript/TypeScript, with ability to configure and test React components locally.
Expertise in Playwright and Jest (or close equivalents like React Testing Library / Cypress)
Working knowledge of version control systems (Git, GitLab, etc.)
Has a depth of knowledge in the Object-oriented Programming paradigm (OOP) and has practically applied the principles  
Working in an Agile team, you will be responsible for inputting to the design and build of automated tests to ensure adequate and effective test coverage  
Provide test assurance of the user stories according to the defined acceptance test criteria; whilst working in a test-first environment.  
Work closely with Software Engineers to deliver the test activities to meet the requirements, whilst contributing to effective agile delivery.  
Participate in estimation activities and identify opportunities for improvement within the team.  
Provide assurance at team retrospectives and planning sessions to ensure test best practice, continual improvements and appropriate standards are adhered to  
Comfortable working with Git repositories and workflows on multiple tasks concurrently   
Ability to manage and lead code review processes, mitigate conflicts within the team and get quality work merged in the main branch 
Proactively collaborate with the Front-end development team, understand the design of the Front-end and discussing issues with the developers to better understand requirements and expectations  
Understanding of CI/CD pipelines and their importance in Automation Testing process  
Understanding of non-functional requirements and testing, with a focus on performance (but also accessibility, compatibility and aspects of security)
Exposure to the Operating System Command line (Windows or Linux)  
Strong problem-solving skills , exhibits logical/critical thinking    
Good coding skills (SOLID, DI, Design Patterns, etc.)   
Able to unit test the framework built   
Experienced working with Cucumber and/or SpecFlow, BDD, ATDD  
Web UI testing experience (different browsers)   
API / Microservice Testing experience   
Has worked across different application domains including Cloud, and Web Applications.  
Mobile Automation, and Contract Testing is a plus  
Ability to work as part of a team and on their own initiative. Consultancy background would be beneficial  
Integrate automation tests into CI/CD pipelines   

Nice to have  

GitHub Actions,  GitLab pipelines, Azure DevOps pipelines, Jenkins (any experience on these will be beneficial)
AWS experience  
Experience with any of these tools: Cypress, Playwright, Webdriver.io (but with strong experience in Selenium)
Understanding (better experience) with Contract Testing frameworks (preferably PACT)
Experience setting up E2E testing frameworks with automation in mind, covering all the aspects of the SDLC

Who we are:

At NTT DATA, you have endless opportunities to think big, act bold and take ownership. As a $30+ billion business and technology services, AI and digital infrastructure leader, we co-innovate solutions with clients and partners globally for business and societal impact. Serving 75% of the Fortune Global 100, with experts in over 70 countries, we encourage experimentation and recognize great work. Proudly a Global Top Employer, NTT DATA is part of NTT Group, which invests over $3 billion annually in R&D. Make this the place where you belong, learn, and build your network. Make this the place where you grow.

what we';ll offer you:

We offer a range of tailored benefits that support your physical, emotional, and financial wellbeing. Our Learning and Development team ensure that there are continuous growth and development opportunities for our people. We also offer the opportunity to have flexible work options.

You can find more information about NTT DATA UK & Ireland here: https://uk.nttdata.com/

We are an equal opportunities employer. We believe in the fair treatment of all our employees and commit to promoting equity and diversity in our employment practices. We are also a proud Disability Confident Committed Employer - we are committed to creating a diverse and inclusive workforce. We actively collaborate with individuals who have disabilities and long-term health conditions which have an effect on their ability to do normal daily activities, ensuring that barriers are eliminated when it comes to employment opportunities. In line with our commitment, we guarantee an interview to applicants who declare to us, during the application process, that they have a disability and meet the minimum requirements for the role. If you require any reasonable adjustments during the recruitment process, please let us know. Join us in building a truly diverse and empowered team.

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About NTT DATA

NTT DATA – a part of NTT Group – is a trusted global innovator of IT and business services headquartered in Tokyo. We help clients transform through consulting, industry solutions, business process services, digital & IT modernization and managed services. NTT DATA enables them, as well as society, to move confidently into the digital future. We are committed to our clients’ long-term success and combine global reach with local client attention to serve them in over 50 countries around the globe.

Industry: IT Services and IT Consulting