This role offers a competitive package, hybrid working (1 day a week in the London office, typically Thursday), 28 days holiday a year plus Bank Holidays and 11% pension from the second year!
Salary £75,000 - £83,000 per annum
Location: London/Hybrid (1 day a week in the London office, typically Thursday)
***We're keen to find individuals with an outcome-driven mindset: Your CV should showcase the outcomes you've achieved, not just the technologies you've worked with. Tell us how you've improved customer experiences, solved business problems, simplified complex challenges showcasing with metrics where possible.***
About the role
We are hiring a Senior Product Engineer for our AI Squad at Which?. You will play a key role in building and maintaining Ask Which?, while developing reusable AI platform capabilities, services, and tooling that enable AI-powered experiences across Which?. We are seeking experienced Full Stack AI Engineers with a proven track record of designing, building, and operating production AI applications and services. Ideal candidates will have experience developing AI-powered applications and reusable AI platform capabilities. They should be proficient in integrating LLMs, AI services, and third-party APIs, with experience building scalable, event-driven, and asynchronous cloud-native solutions.
Our Engineering Manager and Lead Product Manager have put together this short video to give you more detail
What kind of work might I do?
- Software Development and Technical Direction: Write high-quality software and automated tests, contribute to software design, and ensure solutions meet high standards for performance, security, reliability, and fault tolerance. This role focuses on building and enhancing Ask Which, alongside developing reusable AI platform capabilities, services, and APIs. You will own the delivery of AI solutions, champion the use of cloud-native AWS AI technologies, and contribute to technical decisions that shape the evolution of Which? 's AI platform.
- Collaboration: Working with your squad and stakeholders to set up and plan quarterly OKRs that drive the success of AI Squad offering. You will ensure your Squad's work on the AI Platform is aligned with the wider strategy and commitments.
- Operational Excellence: Setting high standards and driving engineering best practice across the AI platform stack. This includes focusing on observability (monitoring, logging, tracing) for the cloud-native solution, participating in peer reviews, and facilitating the maintenance of engineering standards, reliability, and performance.
- Squad Empowerment: Contributing to a culture of creativity, curiosity, collaboration, inclusion and innovation within your Squads as you adopt new technologies and practices for AI Platform.
- Champion Platform Ownership: Take ownership of both Ask Which and the reusable AI platform capabilities you build, ensuring they are secure, reliable, scalable, observable, and easy for product teams to adopt.
What do we expect?
You will provide a high level of technical expertise and leadership within your squad. We are specifically looking for people who have the following characteristics:
- Technical Expertise: You are an experienced Full Stack AI Engineer with expertise in designing and building production-grade, cloud-native applications. You have strong knowledge of TypeScript (Node.js and React/React Native), AWS, Terraform, and building robust RESTful APIs and scalable distributed systems. You are experienced in integrating LLMs, AI services, and third-party APIs, and designing event-driven and asynchronous architectures. You will apply this expertise to build and enhance Ask Which and develop reusable AI platform capabilities.
- AI-Native Engineering: You will champion the use of agentic workflows to accelerate delivery across the AI platform. As an AI-fluent leader, you will leverage GitHub Copilot as a primary partner to automate testing, streamline implementation, and minimize cognitive overhead, ensuring your focus remains on solving our most complex architectural and product puzzles.
- End-to-End Use Case Ownership: You will take full ownership of the end-to-end use cases for the AI platform. This includes designing, implementing, and taking responsibility for the AWS infrastructure, deployment, and observability across the new stack.
- External Integrations Expertise: You will be instrumental in integrating with external partners and 3rd party APIs at scale, leveraging your strong knowledge of event-driven and asynchronous flows.
- Strategic Problem Solver: You will be taking on the most challenging engineering problems facing your squad, and in some cases this will involve driving a team of engineers towards delivering a successful outcome. You focus on solving problems pragmatically while adding value to the product.
- Data-driven and impact-focussed: You will always have our customers/users in mind, ensuring any features or changes you build can be proven to have a positive impact (quantitatively or qualitatively). You will regularly review data to identify and suggest potential improvements.
- Collaborative: You will be working within a multi-disciplinary squad focused on specific outcomes. You are responsible for collaborating on discovery work and ideation and working with other squads to drive better overall products.
- Curious and Proactive: You will never be happy with the status-quo, constantly looking for ways to improve the product, whether through technology or by changing internal processes and practices.
- Technical Mentorship & Stewardship: You support the Tech Lead Manager in mentoring and growing the other engineers in your squad, considering the bigger picture of your development work, including testing, code quality, performance, security, production environment, user experience, and Product vision.
- For a full list of essential requirements, please refer to the role profile, which can be downloaded as a PDF at the bottom of this advert.
How might I progress my career?
At this level you will initially start on the technical leadership track, where you can take on increasingly hard problems with increasing span of ownership and influence and working towards a Staff Engineer role, but there will also be opportunities to shift onto the engineering management track, taking on line management responsibilities and working towards becoming an Engineering Manager with a progression route to Head/Director level roles.
Interview Process
- Meet one of our Engineering Managers via MS Teams (approximately 30 minutes) - Opportunity for you to learn more about the role, answer any questions you have, and provide some examples of providing technical direction across multiple teams and driving product outcomes through technology.
- Technical Take home Test (To be completed in TypeScript)
- System Design & Technical Interview via MS Teams (90 Mins)
We also have these benefits for you to consider:
- 35 hour working week
- Generous 28 days holiday a year plus bank holidays and the option to buy additional holiday days
- Excellent pension scheme – when you pay in 3%, Which? pays in 6% (rising to 11% after one year of service)
- Annual Award (depending on employee and company performance)
- Healthcare insurance & Private medical insurance and opportunity to participate in Vitality rewards programme (at 6 months)
- A discretionary death in service benefit provision equivalent to six times your annual salary
- Free access to Which? member content and free access to Which? money & legal helplines
- Free wills for all Which? employees, plus, partners of employees can make their will at cost price.
- Discount site Pluxee which offers large %% off every day shopping and holidays
- Work from (almost) anywhere” for 4 weeks of the year policy
About Which?
Which? is the UK's consumer champion, here to make life simpler, fairer and safer for everyone. You can find out more about what we do, our people and culture as well as hints and tips on how to complete your application on our Careers site.
We're proud to be ranked 3rd in the ‘Top 25 Inclusive Employers' List 2024. We welcome applications from everyone, because we value diversity, and are committed to maintaining an inclusive culture where all can thrive and reach their full potential—because diverse perspectives help us better understand and positively impact consumers.
As a Disability Confident Leader, we ensure that everyone can apply and be part of our recruitment processes and so we'll make reasonable adjustments if you need them. For this or any other assistance you need with applying (i.e., would like to apply by phone or post), email [email protected]. Find out more about the Disability Confident Interview Scheme here.
Please note:
- You must meet the essential criteria listed within the Role Profile, to have your application reviewed.
- Applications should be submitted via our online careers site, we are unable to accept applications by email. However, if you require an alternative application method as a reasonable adjustment, please contact us using the details above.
- We reserve the right to withdraw this advert at any given time due to the number of applications received.
- Senior Engineer- FullStack -AI Squad - July 2026.pdf
