Full Stack AI Engineer

Location: London (In person)

Swap is the infrastructure behind modern agentic commerce. The only AI-native platform connecting backend operations with a forward-thinking storefront experience.

Built for brands that want to sell anything - anywhere, Swap centralizes global operations, powers intelligent workflows, and unlocks margin-protecting decisions with real-time data and capability. Our products span cross-border, tax, returns, demand planning, and our next-generation agentic storefront, giving merchants full transparency and the ability to act with confidence.

At Swap, we're building a culture that values clarity, creativity, and shared ownership as we redefine how global commerce works.

We are seeking a Full Stack AI Engineer to rapidly architect, prototype, and deploy cutting-edge conversational AI agent systems for e-commerce. You'll build scalable proof-of-concepts at speed, implement multi-modal AI pipelines, and develop production-ready systems with modern web interfaces that quickly adapt to emerging agentic technologies.

What you will do 

• E-Commerce Agent Development: Design and prototype scalable shopping agents using frameworks like PydanticAI, LangGraph, CrewAI, and OpenAI Agents SDK with advanced tool calling for inventory queries, price comparisons, order management, store control, and personalised product recommendations
• Multi-modal Shopping Experiences: Engineer responsive web applications integrating LLM and VLM models for conversational AI experiences, build intuitive frontend interfaces for product image and description analysis, develop voice-enabled conversational commerce features, and create seamless user experiences across web and mobile platforms
• E-Commerce Integration & Evaluation: Build evaluation frameworks using tools like LangSmith, Phoenix, Langfuse, or DeepEval with automated testing pipelines for shopping journeys, rapidly integrate e-commerce APIs (payment processors, inventory management, CRM systems) with secure frontend implementations whilst maintaining security and PCI compliance
• MCP Integration: Implement Model Context Protocol servers for seamless tool integration and standardised agent communication
• Fast Deployment & DevOps: Implement rapid CI/CD pipelines with containerised deployments, automated testing for e-commerce workflows, real-time monitoring dashboards for conversion rates and performance optimisation, and maintain both frontend and backend deployment pipelines

• 3+ years in AI/ML engineering with rapid prototyping experience in conversational AI systems, agent architectures, or fast-paced ML deployment environments, ideally with e-commerce exposure and full stack development experience
• Agent Framework Expertise: Proficiency with PydanticAI, LangGraph, CrewAI, AutoGen, or OpenAI Agents SDK, including agent memory, tool integration for shopping APIs, distributed systems design, and e-commerce workflow orchestration
• Full Stack Development: Python/FastAPI backend development, modern frontend frameworks (React, Vue, or similar), interactive tools like Streamlit/Gradio or modern AI tools such as & , database design for customer data and inventory, and responsive web design principles
• Multi-Modal & Infrastructure: Experience building multi-modal systems with vision-language models for product catalogues, speech processing pipelines with web integration, MLOps platforms, rapid model serving, and real-time inference systems with corresponding user interfaces
• Cloud-Native Deployment: Ideally Google Cloud Platform expertise including rapid Cloud Run deployments, Vertex AI, Vector Search for product recommendations, Pub/Sub for order processing, monitoring, frontend hosting solutions, and Infrastructure as Code

Performance & Evaluation: Experience with system profiling, latency optimisation for real-time shopping experiences, LLM evaluation pipelines for shopping conversations, automated testing frameworks for both frontend and backend, continuous validation, and web performance optimisation.

Benefits

• Competitive base salary.
• Stock options in a high-growth startup.
• Competitive PTO with public holidays additional.
• Private Health.
• Pension.
• Wellness benefits.
• Breakfast Mondays.

Diversity & Equal Opportunities

We embrace diversity and equality in a serious way. We are committed to building a team with a variety of backgrounds, skills, and views. The more inclusive we are, the better our work will be. Creating a culture of equality isn't just the right thing to do; it's also the smart thing.