Building AI tools, onchain infrastructure, and games — mostly solo, mostly for African markets.
A 3D anime fighting game, onchain on Celo.
A 3D fighting game with anime-styled characters, played in the browser, with its onchain layer running on Celo.
AI workflow monitoring for SMBs, over WhatsApp and email.
Workflow monitoring for small and mid-size businesses. Rather than another dashboard to log into, it reports through the channels those teams already work in — WhatsApp and email.
Shielded stablecoin payments on Stellar — client-side ZK proofs, privacy pools, and selective disclosure.
Private stablecoin transfers on Stellar. Proofs are generated client-side rather than on a server, payments route through privacy pools, and selective disclosure lets someone reveal a specific transaction when they need to prove it.
An AI financial copilot on Celo — wallet analysis, spending advice, and health scores for G$.
A financial copilot for Celo wallets. It reads on-chain activity, turns it into plain-language spending advice, and scores financial health for G$ holders.
Multi-agent infrastructure SDK, live on Celo mainnet.
A framework for building governed multi-agent systems. An orchestrator breaks a prompt into subtasks and routes them across specialised agents, reconciling their outputs before anything is committed. Agents carry on-chain identity and per-agent spend caps, pay each other per call, and every run emits a verifiable receipt.
AI subscription manager — scans Gmail for receipts, audits SaaS and AI spend, warns before renewals.
Subscription tracking that works from evidence instead of manual entry. It scans Gmail for receipts, builds a picture of what you are actually paying for across SaaS and AI tools, and warns before a renewal lands.
A 3D arcade racer for mobile — Grand Prix, drift, and zombie Outbreak modes, with runs recorded onchain.
An arcade racer that runs in the browser on a phone. Three rulesets — Grand Prix, Drift, and the zombie Outbreak GP — across tracks from Lagos to a World Tour, with cars, driver tags and unlocks, and race results written onchain.
I'm a design engineer — I design the thing and then build it. Same person, same project, from first sketch to deployed system.
Interface and product design — the structure, the type, the motion, and how the whole thing should feel to use.
Shipping it for real: production web apps, onchain systems and smart contracts, and AI tooling that holds up outside a demo.
Taking an idea from a blank file to something live — without the handoff gap between the design and the engineering.
Currently available for design and build projects.
Caleb — a design engineer running Calbridge Digital, a solo studio in Kaduna working across AI, Web3, and games. I ship small, practical things, and I've taught design and AI along the way.
Available for design and build projects. Tell me what you're making and I'll tell you straight whether I'm the right person for it.
caleb@hoursback.xyz