Senior Software Engineer

An AI tutoring and exam-preparation platform used by millions of secondary-school students across web, iOS and Android. I replaced message-count entitlements with cost-based usage metering across every plan tier, built the AI tutor's memory pipeline, and added credit top-ups with the usage administration interface.

• ✓ Designed and shipped cost-based usage metering across every plan tier on a TypeScript, Next.js, tRPC and PostgreSQL platform, replacing message-count entitlements at millions of requests a month.
• ✓ Built the AI tutor's memory system as an asynchronous pipeline on Inngest durable execution: an LLM extraction pass mines durable facts out of conversations and a nightly reconciliation pass dedupes and prunes them, spread across a four-hour window so overnight database load stayed flat.
• ✓ Added credit top-ups alongside subscriptions and built the usage administration interface end to end, with a purchasing-power-parity Stripe price catalogue and Stripe as the source of truth.
• ✓ Worked in agile sprints directly with the CTO and the product team, and gave an external QA team several dozen tests covering every usage path.

Took over an agency-built investment-intelligence platform covering 20+ global markets. Worked hands-on across the application, AI layer and infrastructure, alongside colleagues in frontend, backend/data APIs and design. The company wound down in March 2026.

• ✓ Built real-time market intelligence: AI watchlists monitoring stocks for earnings, analyst ratings, insider transactions and technical patterns.
• ✓ Worked on the Python/FastAPI data platform with the data team and owned its AI layer, running on Airflow and Kubernetes.
• ✓ Built an LLM-based classification system using hierarchical GPT models to categorise financial signals (M&A, guidance, products).
• ✓ Owned architecture and infrastructure, including the cloud migration from AWS to GCP.

Backend engineer on a smart-city programme where several vendor teams built five city domains at the same time. I designed and built 20+ microservices on Kubernetes and the event-driven layer from the IoT gateways inward, on Kafka and Cassandra. The C4 architecture models I made from the specifications became the reference the vendor teams built against.

• ✓ Designed and built the backend architecture: 20+ microservices on Kubernetes across five city domains, each with its own database and API, using domain-driven design with clean contracts so several vendor teams could build in parallel.
• ✓ Built the platform services the city domains ran on - user, onboarding, notification, certification and mail - in NestJS and TypeScript, with APISIX as the API gateway, Keycloak for identity and GitLab CI for delivery, run in Scrum sprints across several vendor teams.
• ✓ Translated specifications handed over by an external consultancy into C4 architecture models, which became the reference the vendor teams built against.
• ✓ Designed the event-driven layer from the IoT gateways inward: Kafka for event streaming, Cassandra for time-series smart-metering telemetry, PostgreSQL for general storage, Keycloak for identity, and Grafana, Prometheus and Loki for monitoring.

Joined as the first developer alongside the CTO and stayed through the growth of ClassCharts from hundreds of thousands to more than ten million registered pupil, parent and teacher accounts across the UK education system, and through its acquisition by TES Global. The scope moved with it: building the product, then rebuilding the web app from jQuery to React in place, then taking mobile from an Android-only native app to React Native on both platforms, then the infrastructure through Rackspace, GCP and AWS, then onboarding the teams that arrived with the acquisition.

• ✓ Scaled the platform from hundreds of thousands to more than ten million registered accounts - database and query optimisation, caching, and resilient architecture.
• ✓ Modernised the frontend, splitting a jQuery codebase into separate React micro apps.
• ✓ Replaced the Android-only native app with three React Native apps for iOS and Android, first as shells around the web app, then with the parent and pupil apps rebuilt from scratch in 2018.
• ✓ Built the CI/CD pipeline, containerised development and production, and set up the E2E and automated test infrastructure.
• ✓ Led infrastructure migrations across Rackspace, GCP and AWS with migration tooling and no loss of service.
• ✓ Mentored newly joined and junior developers, and owned technical decisions across the product line.

My own company since 2012, as Corcosoft until 2025, and how the engagements above were contracted. This entry is the rest of the client work: around 70 projects, many through partner agencies - full-stack products, internal tools, configurators, booking systems and campaign platforms.

• ✓ Around 50 projects ran through partner agencies: 33 for German clients via Cuibono Media Network, among them Philips, RWE, Innogy, Stadtwerke Krefeld and Ruhrbahn; and 19 via Organizem.
• ✓ Built 18 Facebook campaign and prize-game apps, three of them returning every December as advent-calendar campaigns for six to seven consecutive seasons - fixed launch dates, no room to slip.
• ✓ Full lifecycle responsibility: scoping and estimation, architecture, delivery, deployment and ongoing maintenance.