Hi, I'm Caleb Mantey
CTO & co-founder building agentic AI and spatial computing products
AI Agent Engineer
XR / Spatial Developer
Full-Stack Engineer
CTO, Relu Interactives
The full portfolio is here. These two focused views pair relevant projects with a tailored CV.
VR training, WebXR platforms, digital twins, real-time 3D, and games built with Unity and web technologies.
View XR portfolio XR CVBackend architecture, web and mobile products, LLM workflows, integrations, and engineering leadership.
View software portfolio Software / AI CVI'm Caleb Mantey, Co-Founder & CTO of Relu Interactives and lead engineer of Relu Spatial. I built the platform across its backend and XR engine, bringing together immersive creation, AI, and publishing for web, mobile, and headsets.
I'm a software engineer, AI builder, and XR developer from Accra, Ghana, with 7+ years of shipping products. I co-founded Relu Interactives, where I'm CTO, and I created Relu Spatial, leading its engineering and building its backend and XR engine. I build in two areas: autonomous AI agents that reason and act, and immersive experiences people can step inside. I started out shipping games in Unity and C#, and in 2016 I began building XR, among the first developers in Ghana and Africa to do it. From there I moved into AI engineering, building production agents, multi-agent systems, RAG pipelines, and LLM automation with OpenAI, Anthropic Claude, LangChain, LlamaIndex, Hugging Face, and the Pi Agent SDK. For XR I work in Unity3D, the Meta Quest and Apple Vision Pro SDKs, and WebXR; on the web, in React, Node.js, and Python on cloud infrastructure. I lead teams and teach through technical writing and workshops.
I build the infrastructure behind production AI. From autonomous, tool-using agents and multi-agent orchestration to RAG pipelines and production LLM systems, I design AI that reasons, calls tools, and acts. I build these harnesses with Vercel AI SDK, Claude SDK, and Pi Agent SDK, and route each request to the right model: premium models where they earn their cost, cheaper options like DeepSeek or smaller specialized models everywhere else. That routing and caching has saved clients thousands without trading away quality.
I build production AI harnesses using Vercel AI SDK, Claude SDK, and Pi Agent SDK to wire agentic capabilities into applications. From streaming responses to tool orchestration, I build the interface between your app and AI providers.
I route each task to the model that fits it: Claude Sonnet for complex reasoning, Haiku for speed, DeepSeek R1 for cheap bulk work, and smaller models where they're enough. With caching and prompt optimization on top, that routing cuts costs by 60–80%.
I ground LLMs in private data with retrieval-augmented generation, vector search, embeddings, and semantic memory, so each answer comes with the sources it drew on.
I connect agents to tools, APIs, and the Model Context Protocol (MCP) so they can book, query, and automate work across the systems a business already runs.
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 runs on the model that suits its task.
My current focus: pairing LLM agents with XR and real-time 3D so AI can generate, arrange, and run spatial scenes. That's where I'm taking 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 with logging, cost controls, and observability, then keep improving.
AI / Agentic Stack I Work With
I co-founded Relu Interactives, an immersive technology company in Accra, and I lead its engineering. Our team builds 3D & XR software that organizations use to train operators, visualize plants and offshore assets, and teach engineering students.
Training simulations where your staff rehearse procedures and decisions before doing them on site.
Interactive 3D replicas of real assets and environments for visualization, monitoring, and analysis.
Real-time 3D experiences that run in the browser, on phones, and on headsets.
Games and XR experiences for players and live audiences, like SortJam and Africa's Legends.
Two national awards Relu Interactives won in 2023 for its XR work.
National Entrepreneurship & Innovation Programme (NEIP), Ghana
Relu Interactives took the overall prize at Ghana's 2023 Presidential Pitch with PetSim, our petroleum drilling-rig training simulation for engineering students.
 Award Small small.jpg)
Animation/Gaming Startup Innovation of the Year · Relu Interactives
The Association of Ghana Startups gave Relu Interactives this award at the 2023 Ghana Innovation & Startup Awards.
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.
Articles on AI agents, XR, and what I learn building both.
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If you're hiring, or building with AI agents or XR, send me a note.
Accra, Ghana.
