Back End Engineer

WPP is the trusted growth partner for the world’s leading brands. We unite cutting-edge media intelligence and data solutions, world-class creativity, next-generation production, transformative enterprise solutions and expert strategic counsel in a single company – powered by exceptional talent and our agentic marketing platform, WPP Open, to help our clients navigate change, capture opportunity and deliver transformational growth. We work with the world's most valuable brands and have global reach across 100+ markets, with deep local expertise. Our people are the key to our success. We're committed to fostering a culture of creativity, belonging and continuous learning, attracting and developing the brightest talent, and providing exciting career opportunities that help our people grow. For more information, visit WPP.com. Senior FullStack Engineer WPP Open · Engineering · Gurugram About the job: WPP Open is WPP's AI-enabled marketing operating system, used by brands and agencies around the world. Our engineering teams in India build and run it alongside colleagues in the UK and Europe. As a Senior Engineer you own a component or service, from its design and API to its tests and production health, and you mentor other engineers. The role is backend-heavy, and you also build the React interfaces for the features you deliver. Our interviews are practical and hands-on. Responsibilities: • Design, build, test and ship production code every sprint, test-first. • Own a component or service end to end: its design, OpenAPI contract, data model, Playwright test suite, monitoring and runbook. • Write design documents and architecture decision records for your component, and review other engineers' code with rigour and care. • Choose between AWS Lambda and Kubernetes for your workloads, and build and maintain the CI/CD pipeline that ships them. • Lead triage when your component fails, write post-incident reviews and fix the underlying causes. • Build production AI features on the Anthropic and OpenAI APIs, and maintain your component's Claude Code configuration and MCP server. • Explain technical trade-offs to product and delivery colleagues, including colleagues in other regions. • Mentor less experienced engineers and help new joiners become productive quickly. Minimum qualifications: • Bachelor's degree or equivalent practical experience. • 5 years of professional software development in TypeScript and Node.js or Python. • 3 years of experience testing, maintaining or launching production software, and 1 year of experience with software design and architecture. • Experience working in globally distributed teams across time zones, with stakeholders in other regions. • Backend language and craft. You write idiomatic, strictly typed backend code in TypeScript with Node.js or in Python, with runtime validation at service boundaries using Zod or Pydantic. You understand concurrency in your language well enough to recognise blocking work and profile a misbehaving service, and you know NestJS, Fastify or FastAPI in depth. • React and frontend. You choose and justify state-management approaches in React, keep rendering fast through memoisation, lazy loading and code splitting, and meet WCAG AA accessibility on the features you build. You contribute components to the design system and can build interfaces that stream responses from AI services. • APIs and data formats. You design REST APIs with OpenAPI and own the contract for your service, including versioning, backwards compatibility, idempotency keys, rate limiting and webhooks. You know when to use JSON and when to use Protocol Buffers, and you check schema compatibility automatically in your pipeline. • Data. You design PostgreSQL schemas and change them without downtime, tu