Martin Tomaszczyk

Since starting I led a number of high profile initiatives concerned with the modernisation of a number of Dunnhumby's flagship products that visualise customer data in various ways. As is now becoming a pattern I engaged with stakeholders to introduce a monorepo in order to increase velocity and reduce CI churn. My efforts to date have been greeted warmly with a request to present at architectural forums and at project milestone updates.

• Architected and developed three key applications using Next.js 15 (RSC, server actions, caching, app router) for a fashion procurement platform supporting costing, real-time factory communication, order tracking, and browsing collections.
• Utilised Supabase as the backend-as-a-service (BaaS) and Next.js for the brochure website, admin dashboard, and buyer platform.
• Built and deployed a Python API using FastAPI for generating vector embeddings from images for the purpose of image to image search.
• Structured the project using Turborepo, enabling a shared shadcn/ui component library while still allowing distinct designs for the three Next.js apps.
• Implemented Playwright with GitHub Actions for comprehensive E2E test coverage in the CI pipeline and introduced Storybook for future visual regression testing.

• Developed onboarding and signposting components for users migrating to the new version of the Flagstone investing platform.
• Transitioned discrete frontend applications into a single monorepo using PNPM and NX, improving developer experience, efficiency, and CI pipeline performance.
• Increased E2E test coverage with Cypress, upgraded applications from Node 16 to 20, and stabilised flaky unit tests caused by React anti-patterns and memory leaks.

• Delivered a Next.js 13 (app router) MVP for a YC funded AI-powered energy-saving platform within two weeks, meeting tight deadlines to secure investor funding.
• Built key features, including data visualisation components, authentication, data capture forms, and rich interactive UI.
• Introduced tools like React Query for data fetching, React Hook Form for forms, and shadcn/ui for the component library, ensuring optimal performance and maintainability.

• Contributed to the redevelopment of Selfridges’ e-commerce platform, converting the project to TypeScript and introducing Mock Service Worker and React Testing Library to improve test coverage.
• Delivered e-commerce solutions using Next.js 13 (app router) for clients such as New Look, Calvin Klein, and Tommy Hilfiger, achieving 85%+ test coverage as per contractual requirements.
• Implemented TDD practices using Jest and React Testing Library to ensure code quality and reliability.

• Designed and developed a prototype for a smart home device, including a touchscreen interface, backend infrastructure, and an iPhone app.
• Mastered new skills, such as Flutter/Dart for iOS development and Raspberry Pi hardware integration, to successfully deliver the project.

• Led key features for the Selfridges e-commerce application, including internationalisation, form validation, theming, and checkout.
• Worked on projects for clients such as Colruyt, Sigma Healthcare, and Nespresso’s augmented reality application.