Senior Full Stack Engineer (TypeScript/React/Next.js/AWS)

Our client are a business in the Online Consumer space, they are on the lookout for a Senior Full Stack Engineer to come in on a contract basis. The main project is a CRM migration from Klaviyo to Braze. Key Skills/Requirements Strong experience with TypeScript, React and Next.js. Strong full-stack software engineering experience, with the ability to work across both Front End and Back End development. Experience working with AWS, ideally including Lambda, API Gateway, DynamoDB and AWS CDK. Experience building and integrating APIs and third-party services. Experience designing and building scalable, production-grade applications and architecture. Strong experience with unit, integration and end-to-end (E2E) testing. Experience working on complex system integrations, migrations or large-scale platform projects. Ability to contribute to the development of foundational architecture supporting a CRM migration, with the project involving the migration of millions of existing customers from Klaviyo to Braze. Nice to Have Previous experience with Braze or Klaviyo. Experience with CRM, CDP, customer engagement or marketing automation platforms. Previous experience working on CRM migrations or customer data migrations. Contract is running for 3 months initially, paying up to £570p/day (Inside IR35 via Umbrella) and will be 3 days per week onsite in London ..... full job details .....