Have you been a founding/lead Full Stack Engineer in an exciting start-up / scale up? Does working for a heavily backed, forward thinking AI company in London excite you? Are you looking to help scale and deliver new features that delight users? This is a full-time, on-site role , requiring five days per week in our London office. Leveraging next-generation artificial intelligence, they deliver transformative insights and seamless user experiences, setting a new benchmark for the industry. As they experience rapid growth, this client is looking for a Senior Fullstack Engineer to help scale and deliver new features that delight users. The team is comprised of experienced leaders and engineers from top-tier companies and research institutions, bringing deep expertise in AI, machine learning, and software development. Backed by leading venture capital firms, we are a revenue-generating start-up with strong financial backing and years of runway. Joining this team means tackling exciting technical challenges at the intersection of user experience , machine learning , and infrastructure , all within a fast-paced, collaborative environment that values learning and excellence. As a Senior Fullstack Engineer , you’ll play a pivotal role in building and optimizing systems to meet growing user demand. Creating user-facing front-end interfaces in partnership with the product team. Delivering high-quality features with thorough testing and debugging. 3+ years of industry experience , building scalable systems. ~ Strong knowledge of backend technologies, particularly Python or Go . ~ Experience working with databases such as Postgres and Redis . ~ Proficiency in front-end technologies, including Typescript , react-query , React , and modern build tools. Bonus Skills (helpful but not essential): Pulumi on AWS). React Native). Exposure to platform engineering, C++, or video streaming technologies. Competitive salary: £100% employer-paid private dental and vision insurance . Join in redefining what’s possible with AI-powered systems.