Nathan de Castro

Principal developer across the company's entire product portfolio: Flutter mobile apps, web platforms, Unity installations and Windows/Linux kiosk software, owning architecture, implementation, deployment and support.

• CPPS digital suite: designed and built the full technology stack for a public earthquake training centre and museum, a reservation and payment platform for state, private and educational clients, with automated invoicing, accounting and reporting. 50,000 users/year. (REST APIs, Stripe, Firebase)
• CPPS exhibit and kiosks: built the centre's integrated exhibit framework, home to Europe's largest earthquake simulator across 3 spaces and 27 interactive stations, designed with seismology experts and university professors. 30+ touchscreen mini-games and a fleet of 30 wall-mounted tablets, each running its own kiosked webapp/APK over a secured local network with Docker, centrally configured and remotely updated. 30,000 visitors/year. (Android, Docker, kiosk and touchscreen interfaces)
• Escape With Wallis: hour-long Android escape game guiding visitors through the exhibit, with offline-tolerant progress sync and trigger-driven scripted events. 3000+ sessions completed. (Android, Firebase)
• Winston: architected and built the company's finance and accounting platform. LLM-driven document ingestion, categorisation and reconciliation on a conventional ledger core, with invoicing / VAT / payroll / Business expenses / AI automated cold calling. Replaced 4+ separate SaaS subscriptions and still expanding. (LLM API integration, agentic workflows, .NET)
• Exploreum: multi-tenant platform connecting museums with cross-institution progress tracking and rewards; currently in rollout. (Firebase, REST APIs)
• Designed and rolled out agentic AI workflows across multiple delivery pipelines (specification, scaffolding, code review, testing and documentation) (Claude Code, MCP)

• PulmoVR: developed and maintained a VR clinical application to visualise complex anatomical structures and accelerate lung segmentectomy planning through machine-learning segmentation. Clinically validated results: -30 min average operating time for 3D VATS vs. 2D VATS, >97% anatomically accurate 3D models, and a 52% surgical plan change rate after 3D model review. (C#, Unity)
• Led delivery for the development team within an Agile/Scrum framework: sprint planning, daily stand-ups, task breakdown, delegation, code reviews and change documentation, tracked via GitHub Projects.
• Drove CE marking and ISO 27001 readiness: information-security risk assessment and mitigation, controlled change management, and the technical documentation required for a regulated medical product.
• Ran requirements gathering and validation directly with surgeons and clinical staff, then fed their feedback back into the implementation.

• Eventrum: built a browser-based virtual conference platform on WebRTC, delivered in partnership with TU Delft and Accenture, with real-time audio/video, room signalling and presence for up to 1k concurrent participants. (WebRTC, Unity, JavaScript)
• TeamUp: networked multiplayer team-building game delivered to WebGL and Windows, with authoritative session state over Photon. (WebGL, Photon, Unity)
• BMO industrial simulator: built a virtual training simulator for the client's industrial sorting machine, with a scenario-authoring tool trainers used to create build, maintenance and operations exercises, cutting the cost and time of flying in a senior trainer for 2-week onboarding trips. Deployed on WebGL and Windows at the client's facility. (C#, Unity)
• Led within an Agile/Scrum team: sprint planning, daily stand-ups and code reviews, tracked via ClickUp.