UK Internship Program at Perplexity | London

Perplexity is thrilled to introduce our Internship Program, designed for outstanding Master’s or PhD students specializing in Computer Science or Engineering in the UK for the 2025-2026 academic year. This immersive program offers a direct collaboration with our AI Inference team, providing a distinctive opportunity to acquire invaluable experience within a rapidly expanding AI startup. Exceptional interns may receive an offer for a full-time position upon completion of the program.Our AI Inference team is integral to the performance of Perplexity's products, overseeing the inference engine and deployments for models ranging from single-node embeddings to advanced distributed sparse Mixture-of-Experts models, all while managing extensive GPU clusters. With a focus on optimizing latency and throughput, the Inference team encompasses the entire serving stack, from GPU kernels to networking and monitoring infrastructure.

Join our innovative team at Perplexity as an AI Inference Engineer, where you'll be at the forefront of deploying machine learning models for real-time inference. Our technology stack includes Python, Rust, C++, PyTorch, Triton, CUDA, and Kubernetes. This is a fantastic opportunity to contribute to large-scale ML applications.Key ResponsibilitiesDevelop robust APIs for AI inference catering to both internal and external clients.Conduct benchmarking and resolve performance bottlenecks in our inference stack.Enhance system reliability and observability, responding effectively to outages.Investigate cutting-edge research and implement optimizations for LLM inference.

Join Perplexity, a pioneering firm serving millions of users daily by providing reliable and high-quality answers through an innovative LLM-first search engine combined with specialized data sources. Our Answer Quality team plays a crucial role in refining prompts, tools, searches, and specialized datasets, ensuring that our evaluations are fast, accurate, and actionable. In this exciting role, you will be instrumental in building the data flywheel that supports various teams across Perplexity.ResponsibilitiesDevelop and maintain systems and pipelines that empower Search, Product, and other teams to independently access reliable evaluation verdicts without delays.Take charge of the "evals-to-product" loop, autonomously transforming raw signals into robust datasets that drive decision-making throughout the organization.Construct a sophisticated simulator pipeline capable of replaying user interactions with the product in formats comprehensible to LLMs and VLMs, reflecting real-time product updates.Ensure data integrity by implementing monitoring, lineage tracking, and quality checks, providing downstream consumers with reliable results.Collaborate within a small, impactful team where your contributions will directly influence how Perplexity measures and enhances Answer Quality.

Join Perplexity, a pioneering company based in London, as we transform the way users search and engage with the internet. We are seeking seasoned Infrastructure Engineers to become integral members of our dynamic team. In this role, you will lead the design, implementation, and scaling of innovative tools, systems, and platforms that empower web, mobile, and browser engineers to develop cutting-edge products. Your contributions will be vital in enabling our product, AI, and development teams to innovate swiftly while ensuring utmost reliability, security, and performance at scale.Our Tech StackPython | Go | TypeScript | PostgreSQL | DynamoDB | Redis | FastAPI | React | Bazel | GitHub | AWSTeams HiringSenior/Staff PlatformThe Platform team is fundamental to ensuring product reliability, scalability, and performance at Perplexity. This elite team is responsible for developing and maintaining the critical infrastructure—from backend systems such as authentication, real-time data flows, and service orchestration to frontend frameworks that guarantee fast, reliable, and secure user experiences. By upholding stringent standards for code quality, uptime, and developer productivity, the Platform team enables all of Perplexity to innovate rapidly on a solid, well-designed foundation.Senior/Staff DevXThe Developer Experience (DevX) team is dedicated to empowering engineers at Perplexity to build, ship, and iterate faster than ever before. They manage internal platforms for source control, build, test, and deployment, effectively removing bottlenecks from each phase of product development. This team designs seamless onboarding, ultra-fast CI/CD pipelines, and developer tools that enhance creativity and safety at scale. Through collaborative efforts and significant autonomy, the DevX team amplifies the contributions of every engineer, facilitating rapid, dependable innovation across the organization.Senior/Staff Cloud InfraThe Cloud Infrastructure team architects and manages the essential cloud infrastructure that powers Perplexity’s global platform. This team designs and scales computing, storage, and networking systems to support high-throughput, low-latency workloads, balancing proactive project initiatives with operational support. Collaboration with product, AI research, security, and other teams ensures that our services remain consistently available, reliable, and responsive to user demands.

At Perplexity, we empower millions of users every day with accurate, high-quality answers through our innovative LLM-first search engine and specialized data sources. Join our Answer Quality team, where we focus on enhancing user experience by ensuring our prompts, tools, search capabilities, and specialized datasets, combined with both cutting-edge and in-house models, provide the best results. As a Data Scientist/Engineer, you will analyze online signals derived from user interactions to connect shifts in answer quality with actual user behavior.Key ResponsibilitiesIdentify and validate online signals from user interactions that act as dependable indicators of true answer quality.Develop and implement innovative online metrics for tracking in A/B testing and product health dashboards, ensuring alignment with ground-truth evaluations.Evaluate experimental results to validate these metrics, ensuring they accurately reflect user satisfaction and guide product decisions.Construct and sustain data pipelines that compute these metrics at scale, providing actionable quality signals to Search, Product, and model training teams.Share insights and foster collaboration with Product and Search teams to enhance clarity and understanding.Contribute to a small, high-impact team where your work is instrumental in shaping how Perplexity measures and enhances Answer Quality.QualificationsMaster's degree in a technical field or equivalent professional experience.4+ years of experience in roles such as Data Scientist, Analytics Engineer, or similar positions.Proven experience with search, recommendation, or LLM-based products, particularly in designing online metrics and analyzing A/B tests.Strong coding skills in Python and SQL, with the ability to produce production-grade code.In-depth knowledge of statistical analysis methodologies.Experience using Business Intelligence (BI) tools for data visualization and reporting.Comfortable with coding workflows and using AI-assisted development tools for rapid iteration.Preferred QualificationsFamiliarity with Apache Spark and Databricks.Experience in developing or validating LLM-as-a-judge systems.Previous experience supporting large-scale customer-facing products.

Join Perplexity AI as a Search Machine Learning Engineer Intern, where you will have the opportunity to work alongside industry experts in the field of machine learning and artificial intelligence. This internship is designed to provide hands-on experience with cutting-edge technologies and methodologies in search algorithms and data analysis.

Role Overview Perplexity is seeking a People Operations Manager for a maternity cover based in London. This role centers on supporting the team through a range of HR responsibilities while contributing to a positive workplace culture. What You Will Do Oversee daily HR operations, including employee relations and performance management Collaborate with leadership to develop and implement workplace policies Manage talent acquisition and onboarding processes Support initiatives that help employees feel engaged and valued What Matters Here Experience with HR functions such as employee relations, recruitment, and onboarding Ability to work closely with leaders to shape workplace culture Strong organizational skills and a people-first approach This is a fixed-term position covering maternity leave.

Role overview Three UK is seeking a Regulatory Manager to join the team in London. The position centers on ensuring the company meets all relevant regulatory obligations and helps the business stay aligned with current compliance standards. Key responsibilities Oversee compliance activities throughout the organization Maintain communication with regulatory authorities when required Create and apply policies that support regulatory compliance Promote sound business practices by implementing effective compliance measures Location This role is based in London.

Join Three UK as a Regulatory Lead and play a pivotal role in shaping our regulatory strategies. You will be at the forefront of navigating complex regulatory landscapes, ensuring compliance, and advocating for our interests in the telecommunications sector.

Join Three UK as a Regulatory Manager, where you will play a vital role in shaping our regulatory strategies and ensuring compliance with industry standards. You will collaborate with various stakeholders to develop and implement policies that support our business objectives while adhering to regulatory requirements.

Three UK seeks a Partnerships Executive in London to help develop and maintain key relationships with partners. The position supports the company’s goal of providing reliable connectivity and a positive customer experience. Role overview This role centers on building and nurturing strategic partnerships. The Partnerships Executive will work with internal teams and external organizations to strengthen collaboration and ensure shared objectives are met. Key responsibilities Establish and manage partnerships that align with Three UK’s business goals Maintain ongoing communication with partners to support mutual success Contribute to initiatives that enhance customer connectivity and satisfaction Location This position is based in London.

Role overview The Regulatory Lead at Three UK plays a key part in guiding compliance and shaping company policy to meet telecommunications regulations. Based in London, this position works closely with teams across the business, providing regulatory expertise and ensuring that company practices align with industry requirements. What you will do Advise on regulatory issues that impact the telecommunications sector Collaborate with internal teams to maintain compliance with laws and standards Assist in developing and updating internal policies to match current regulations Support the business in understanding and applying regulatory changes Location This role is based in London.

Three UK is looking for a GTM Planning & Governance Specialist based in London. This position plays a key role in shaping go-to-market strategies and upholding governance standards across multiple projects. Collaboration with various teams is central, as the role aims to refine business processes and drive operational improvements. Main responsibilities Assist in planning and carrying out go-to-market activities for different initiatives Work alongside cross-functional teams to make workflows more efficient Help ensure that projects meet governance requirements and follow established best practices Support efforts to boost efficiency throughout operations

Join Three UK as a Senior Counsel specializing in Regulatory Implementation, where you will play a pivotal role in navigating the complexities of telecommunications regulations. Your expertise will ensure compliance and drive strategic initiatives in regulatory matters.

Role overview The Head of UK Development at HTB is responsible for increasing annual financial support from UK donors to advance Alpha’s global mission. This position develops and implements a sustainable fundraising strategy that covers major, mid-level, and base giving, ensuring a steady flow of income for the organization. Key responsibilities Develop and lead Alpha International’s fundraising strategy and annual plans for the UK. Expand the UK major donor program, focusing on securing multi-year commitments. Manage a portfolio of major donors, each giving £10,000 or more per year. Identify and engage new major donors through networking, referrals, and introductions from peers. Support and guide team members working on mid-level and base giving initiatives. Collaborate with senior leadership to build relationships with high-net-worth individuals, trusts, and organizations. Organize and deliver donor events in the UK, including the donor experience at the Leadership Conference. Coordinate donor engagement with the HTB Group Fundraising Committee. Encourage collaboration on fundraising efforts across the UK with the Alpha UK regional team. Location This role is based in London, England, United Kingdom.

At Perplexity, we are transforming the way individuals discover and engage with information through cutting-edge AI-powered search and knowledge tools. As we broaden our global reach, we are excited to establish a significant presence in London, a key hub for innovation and growth across Europe.The Role:We are in search of an outstanding Site Lead to launch and expand our London office. This is a remarkable opportunity to define Perplexity's footprint in one of the world's foremost technology centers, where you will cultivate teams and a vibrant culture from the ground up, all while propelling technical brilliance in infrastructure and AI systems.As the Site Lead, you will be the representative of Perplexity in London, tasked with constructing our technical organization, nurturing a premier engineering culture, and directly overseeing one or more infrastructure teams. Your role will involve reporting to senior leadership and collaborating across various teams within our global network.

About the MBA Internship Eucalyptus is seeking an MBA Intern to join the team in London. This internship offers direct involvement in business strategy and operations, with exposure to real projects that support the company’s mission. What You’ll Do Work alongside the leadership team on key business initiatives Contribute to projects that shape company direction Gain practical experience in strategy and operations within a growing organization Location London, UK (Headquarters)

Three UK is hiring a part-time Retail Customer Advisor for its London location. This position places you on the shop floor, where you interact directly with customers and represent the Three UK brand. Role overview In this role, the focus is on supporting visitors throughout their in-store experience. You will answer questions, guide people to the right products or services, and ensure everyone leaves with what they need. Providing friendly, clear advice on technology and mobile plans is a key part of the job. Keeping the store tidy and welcoming is also important. What you will do Greet customers and listen carefully to their needs Assist shoppers in selecting suitable products and services Offer straightforward, approachable advice about technology and plans Help maintain an organized, inviting store environment Requirements Comfortable talking with people and finding solutions Interest in technology and mobile devices Positive, helpful attitude on every shift This part-time role suits those who enjoy helping others and want to learn more about the latest tech in a retail setting.

Why Faculty?Founded in 2014, Faculty believes that artificial intelligence (AI) is the defining technology of our era. We have successfully partnered with over 350 global clients to enhance their operational performance through human-centric AI solutions. You can explore our impactful projects here.At Faculty, we prioritize innovation over trends. Our mission is to create and implement responsible AI that drives tangible results. With our extensive technical, product, and delivery expertise, we serve clients across various sectors including government, finance, retail, energy, life sciences, and defence.Our rapidly growing business and esteemed reputation attract individuals who share our passion for intellectual exploration and aim to create a positive technological legacy.Join us in leveraging AI, an epoch-defining technology, to envision its most impactful applications and bring them to fruition.About the Opportunity:This program is exclusively for individuals in the final year of their military service.Are you a veteran preparing to transition from military service? Do you want to gain insight into the operations of a leading tech company or explore a career path in AI or data science? Faculty is excited to offer opportunities for service veterans to participate in an unpaid "Civilian Work Attachment" throughout the year.AI is a crucial tool for the UK military, aiding in intelligence analysis, operational coordination, insight extraction, and decision-making—elements vital for the protection of British citizens.At Faculty, our custom machine learning software supports defence organizations in addressing contemporary challenges, ranging from surveillance and reconnaissance to autonomous systems and combat service support.We invite you to spend one week at our London office in Old Street, where we will provide a structured and educational experience, engaging with various roles, processes, and personnel within our Defence Business Unit.

Role overview Xero Limited is seeking a Senior Engineer to join its UK Regional Team, based in London at 7 Devonshire Square. This position focuses on shaping features for the UK market, connecting technical work directly to customer needs and business outcomes. Senior Engineers at Xero handle complex challenges that span multiple products, balancing regional requirements alongside global strategy. Team structure and collaboration The team includes an Engineering Manager, Lead Engineers, and Engineers, all reporting to the General Manager of Engineering for the UK. Collaboration is a core part of the role. Senior Engineers work closely with product owners and peers across Xero, designing, building, and delivering solutions that have real impact. Projects and technical scope Current projects span the full Xero platform, including Payments, Accounting, and Payroll. This role provides exposure to a broad range of products and technical domains within Xero’s suite. Work environment Xero holds a Great Place to Work UK accreditation. Flexible work arrangements are available: choose remote, hybrid, or office-based work in London, Milton Keynes, or Manchester. Offices are designed to support collaboration and connection. Some travel may be needed to coordinate with global teams and support international partnerships. Requirements Curiosity and drive to solve customer problems, delivering clear business value across technical areas Adaptability in learning new domains and navigating unfamiliar codebases Ability to work with stakeholders and build consensus across distributed teams Commitment to high-quality engineering practices, producing scalable and maintainable code Comfort in high-visibility situations, using strong communication to engage stakeholders and broaden influence Experience with modern programming languages and frameworks, along with a solid understanding of software engineering fundamentals