Senior Software Engineer

An AI tutoring and exam-preparation platform used by more than 13 million 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.

Joined as the first developer alongside the CTO and stayed through the growth of ClassCharts from hundreds of thousands of users into a platform serving more than ten million pupils, parents and teachers 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 users - 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.

• ✓ Backend engineer on a smart-city IoT platform (2024-2025): designed and built 20+ microservices on Kubernetes with Kafka event streaming and Cassandra time-series storage.
• ✓ 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.