Dan Train

Led development of a new sustainable fashion initiative allowing customers to trade in their pre-loved luxury goods for store credit. The goods are refurbished and sold online under the "Reselfridges" brand.

Oversaw four engineers plus QA within a cross-functional team following a Kanban agile delivery process.

The team worked with product managers, business analysts, third-parties and technical stakeholders to establish and enable this new business process.

System includes separate UIs for customers and internal admin users built with Next.js app router, consuming a central "Supergraph" aggregating many GraphQL services into a single interface with Apollo Federation.

Back end includes a GraphQL "Subgraph" built with Pothos and implementing the Event Sourcing pattern with XState, backed by DynamoDB.

System utilises an AWS EventBridge message bus with Lambda function handlers to coordinate integrations to warehousing, couriering, CRM, gift card, product catalogue and stock services.

Led development of a digital platform for Levi's global and regional merchandising teams, transforming their go-to-market process.

Collaborated closely with product managers and stakeholders in San Francisco.

Oversaw six engineers plus QA within a cross-functional team including two dedicated user experience designers.

Provided line management, mentorship and guidance to engineers on the team, two of whom achieved promotion to Tech Lead.

The platform allows merchants to curate and collaborate on product "assortments", viewed with different lenses including a grid view (built with TanStack Virtual), table view (built with AG Grid) and a Miro-like infinite canvas (built with dnd kit and D3).

Assortments may be copied, searched, filtered and aggregated across product seasons and regions.

React app utilises Relay to query a Node.js GraphQL server, built code-first with Apollo Server and Prisma.

The server is packaged as a Docker container image and deployed to AWS ECS with Fargate, querying an Aurora Serverless PostgreSQL database.

Integrated SSO with Okta using the OAuth 2.0 authorization code flow, verifying access tokens with a Lambda function at the API Gateway.

The platform provides role-based authorization using verified JWT claims.

Assortify has been adopted by 95% of merchants globally, replacing 4 legacy products and encompassing 70% of the merchant workflow in a single unified tool.

Led development of a bespoke interface enabling Trading Operations to monitor and control the world's largest market in forwards, futures and options on base metals.

Directed the parallel development of a Design System and React component library tailored to financial Data Visualisation, including trade tickers and dashboards.

Oversaw a team of six engineers plus QA, providing line management, mentorship and support throughout the COVID-19 lockdowns.

The application displays high volume real-time trading data from a Kafka source via a GraphQL subscription over a WebSocket transport.

React app utilises Relay to query a Node.js Apollo Server BFF, lazily rendering tabular data with TanStack Virtual.

Collaborated with internal teams to establish OpenAPI specs for shared interfaces, tested against on Bitbucket Pipelines CI with Cypress and WireMock.

Worked with Delivery Leads to introduce Agile ways of working resulting in "the most successful execution of agile within the organisation".

Supported the recruitment of a successor internal team and managed a comprehensive handover process.

Led development of a journey enabling HSBC UK customers to apply online for a US bank account.

The application integrates with existing services to streamline a complex process that previously required multiple customer service centre calls.

Oversaw a team of four senior engineers comprising a mix of front-end and back-end expertise.

Collaborated with HSBC architects on cloud infrastructure design in AWS.

Instituted a robust testing strategy with JUnit and Jest unit tests, Cypress integration tests and manual exploration testing with a dedicated QA engineer.

Dogfooded the Piggybank design system which dramatically sped up development.

Led development of a Design System for consumer banking product onboarding journeys.

Published a library of atomic components that when composed provided standardised behaviour for multi-page form validation and state management via React context.

The system was externally audited for WCAG Level AA Accessibility standard compliance.

The system provides common interfaces for navigation, analytics tracking, and theming supporting multiple brands.

Worked closely with Design and UX to provide clear standards and guidance to adopters through extensive documentation and examples, including a Storybook and reference app.

Promoted an Inner Source model encouraging community contributions while providing centralised governance. System has been adopted by sixteen engineering teams worldwide.

Jointly led development of the loan application journey for HSBC UK customers.

The application integrates with myriad core banking services within a Mulesoft API-Led Connectivity architecture.

React app is server-side rendered by a Node.js BFF.

Worked within a large multi-team monorepo hosted internally on GitHub Enterprise with Jenkins CI.