Hi, I'm Caleb Mantey
CTO & Founder building at the edge of Agentic AI and Spatial Computing
AI Agent Engineer
XR / Spatial Developer
Full-Stack Engineer
CTO, Relu Interactives
I'm Caleb Mantey Co-Founder & CTO of Relu Interactives and creator of Relu Spatial, our browser-native WebXR platform. I build autonomous AI agents and immersive spatial experiences, with 7+ years across the full software development life cycle.
I'm a software engineer, AI builder, and XR pioneer from Accra, Ghana turning bold ideas into intelligent, immersive products for over 7 years. As Co-Founder & CTO of Relu Interactives and the creator of Relu Spatial (our browser-native WebXR platform). I work where artificial intelligence meets spatial computing: building autonomous AI agents that reason and act, and immersive experiences people can step inside. I started out shipping games in Unity and C#, became one of the earliest pioneers of XR in Ghana and Africa since 2016, then moved deep into AI engineering, building production AI agents, multi-agent systems, RAG pipelines, and LLM-powered automation with OpenAI, Anthropic Claude, LangChain, LlamaIndex, Hugging Face, Pi Agent Sdk, you name it. My toolkit spans agentic AI, Unity3D, XR SDKs (Meta Quest, Apple Vision Pro), WebXR, and full-stack development (React, Node.js, Python) on modern cloud infrastructure. I lead teams, share insights through technical writing and workshops, and stay obsessed with one question: how do we make technology that doesn't just look futuristic, but actually solves real-world problems?
We're in the age of AI and I build the infrastructure that powers it. From autonomous, tool-using agents and multi-agent orchestration to RAG pipelines and production LLM systems, I design AI that reasons, uses tools, and takes real action. I specialize in building AI harnesses with Vercel AI SDK, Claude SDK, and Pi Agent SDK, with strategic cost optimization through intelligent model routing, knowing when to use premium models vs cost-efficient alternatives like DeepSeek or smaller specialized models. I've saved clients thousands while maintaining quality through smart model selection and caching strategies.
I build production AI harnesses using Vercel AI SDK, Claude SDK, and Pi Agent SDK that seamlessly integrate agentic capabilities into applications. From streaming responses to tool orchestration, I create robust interfaces between your app and AI providers.
I architect AI systems with intelligent model routing using Claude Sonnet for complex reasoning, Haiku for speed, DeepSeek R1 for cost-effective tasks, or smaller models where appropriate. Strategic caching, prompt optimization, and model selection that cuts costs by 60-80%.
I ground LLMs in private data with retrieval-augmented generation, vector search, embeddings, and semantic memory so answers are accurate, sourced, and trustworthy.
I connect agents to real-world tools, APIs, and the Model Context Protocol (MCP) so they can take action across systems, booking, querying, automating, and integrating end-to-end.
I build collaborative agent systems where specialized agents coordinate, delegate, and verify each other's work using orchestrator–worker patterns and graph-based workflows (LangGraph). Each agent uses the optimal model for its specific task.
My frontier: fusing LLM agents with XR and real-time 3D AI that generates, composes, and drives immersive spatial experiences. It's the direction powering our WebXR platform, Relu Spatial.
Clarify the task, success criteria, scope, and safety boundaries the agent must operate within.
Wire up the right tools, APIs, RAG retrieval and MCP servers so the agent has the context to act.
Compose planning, memory, and multi-agent workflows, single agent or coordinated swarm.
Build evals, trace every step, catch failures, and iterate on prompts, tools and routing.
Deploy to production with logging, cost controls, and observability then keep improving.
AI / Agentic Stack I Work With
I co-founded and lead engineering at Relu Interactives, Ghana's premier immersive technology company. We create immersive 3D & XR solutions that help organizations train, visualize, and solve real-world problems, pioneering the future of interactive technology in Africa.
Immersive training simulations that streamline operations, improve communication, and sharpen decision-making.
Interactive 3D replicas of real assets and environments for visualization, monitoring, and analysis.
High-performance, real-time 3D experiences that run anywhere, on the open web, mobile, and headsets.
Games and creative XR products designed to inspire, entertain, and connect audiences.
National awards and industry recognition highlighting innovation and impact in XR development
National Entrepreneurship & Innovation Programme (NEIP), Ghana
My startup (Relu Interactives) won the prestigious Presidential Pitch competition, demonstrating exceptional innovation in XR technology and spatial computing solutions. This national recognition validates our pioneering work in bringing immersive technologies to African markets.
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Animation/Gaming Startup of the Year - Relu Interactives
Recognized as the leading animation and gaming startup in Ghana for 2023. This award highlights our company's innovative approach to XR development, real-time collaboration platforms, and our contribution to advancing the XR ecosystem in Africa.
7+ years spanning AI engineering, XR, and full-stack development — from founding and leading Relu Interactives to building AI agents and immersive systems for global teams.
Contact MeBuilding autonomous agents with cost-optimized models & orchestration
Full-stack tools for building scalable AI-powered applications
A selection of XR, AI, game, and full-stack projects I've shipped — from immersive VR training to production apps.
My latest articles and insights on AI agents, XR, and building at the frontier of technology.
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Building something with AI agents or XR? Hiring? Let's talk and let's start an awesome partnership.
Email me on any projects you have in mind and let's get the discussions going.
manteycaleb@gmail.comAccra, Ghana.
