Senior Agentic Software Engineer | Poolday

Senior Agentic Software Engineer | Poolday Early engineer at a funded AI startup building a live 22+ agent system inside a real video editor. Design multi-agent orchestration, memory, and production-grade reliability in TypeScript. Europe based candidates | Remote A-Players is helping Poolday hire a Senior Agentic Software Engineer to build the core agent systems behind a next-generation AI-powered video editor. Poolday is creating a new category of creative tooling that combines a traditional timeline-based editor with autonomous AI agents that can understand intent, generate visuals, and manipulate projects end-to-end. This role will work closely with the founders and early engineering team to design and implement the agentic architecture that powers the product. This is a high-ownership position with significant influence over system design, product direction, and engineering culture. About Poolday Poolday is building a modern video editor where users describe what they want, and intelligent agents assemble compositions, generate pixels, and perform edits autonomously. The product blends familiar creative workflows with cutting-edge agentic AI systems. The founding team consists of experienced operators and builders with a strong track record of shipping complex products. Poolday is early-stage, product-driven, and focused on building category-defining creative tools. What You’ll Be Doing Designing and building multi-agent systems in TypeScript , including a primary orchestration agent and specialized sub-agents Architecting agent workflows that interpret user intent, plan multi-step edits, and execute them across a video timeline Building the interface layer between agents and the video editor , enabling agents to read project state, issue commands, and observe results in real time Developing agent capabilities for scene composition, visual generation, timing adjustments, effects, and compositing Implementing plan-and-execute loops , recovery strategies, and feedback mechanisms for reliable autonomous editing Creating memory and context systems that allow agents to reason about project state, user preferences, and editing history Working closely with founders to shape both the product vision and the technical foundations of the platform What Poolday Is Looking For Must-Have 5+ years of professional software engineering experience with strong system design skills Deep expertise in TypeScript , including building large, maintainable codebases Experience building complex front-end or editor-like applications using React Hands-on experience with agentic systems (e.g. LangChain.js, LangGraph.js, Vercel AI SDK, or custom agent frameworks) Strong understanding of agent orchestration patterns such as hierarchical delegation, multi-agent collaboration, and plan-and-execute loops Experience designing APIs or command layers to programmatically control complex applications Strong prompt engineering skills, including function calling and structured outputs Ability to work independently in ambiguous, fast-moving environments Nice to Have Experience with video editing software, motion graphics, or creative tooling Familiarity with generative Al for images or video Experience building plugin systems or extensible application architectures Why Join Poolday This is a chance to help define how AI agents will power creative tools. You’ll work on a product where users describe an idea and watch agents build it - composing scenes, generating visuals, and assembling edits autonomously. Poolday offers real ownership, deep technical challenges, and the opportunity to shape a product from early traction to scale. Department Tech Location London, UK Remote status Fully Remote Employment type Full-time Applicant tracking system by Teamtailor