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Tom Biddulph
Backend-focused C# engineer building reliable, accessible web and fintech systems.
At NewDay, I build and maintain accessible financial products used by millions of customers. My background spans several leading fintech teams.
Leeds, United Kingdom
Experience
Senior Software Engineer
NewDay / 2023 -present
Builds accessible features for financial products that serve millions of NewDay customers. Senior Software Engineer
Codat / 2022
Software Engineer II
Checkout.com / 2021 - 2022
Software Engineer
NewDay / 2019 - 2020
Associate
AND Digital / 2018 - 2019
Education University of Hull
Bachelor's Degree, Computer Science / First-class honours (1:1)
Technology stack
Languages
C#, TypeScript, SQL Platform
.NET, ASP.NET Core, Azure Functions Cloud
Azure, Service Bus, Application Insights Infrastructure
Proxmox, Kubernetes, self-hosting Observability
OpenTelemetry, distributed tracing, OTLP Delivery
Docker, GitHub Actions, CI/CD Testing
TUnit, integration testing, test hosts Selected projects
A JetBrains Rider plugin for switching NuGet package references to local .NET projects and restoring them exactly.
Stack: Kotlin, JetBrains Rider SDK, .NET, MSBuild
The Rider plugin discovers local SDK-style .NET projects, replaces a selected PackageReference with a relative ProjectReference, and preserves the original XML for a safe restore.
Architecture
Configurable local source roots Background project discovery and package matching PackageReference switch tracking and exact restoration Highlights
Published on JetBrains Marketplace for Rider 2025.1+ Preserves project formatting and the complete original package reference Refuses unsafe restores when the managed reference has changed Get it on JetBrains Marketplace
View source on GitHub
A web UI for exploring and managing the Azure Service Bus Emulator.
Stack: React 19, .NET 10, Azure Service Bus, SQL Server, OpenTelemetry
The application combines a React and Vite interface with an ASP.NET Core API and the Azure Service Bus Emulator.
Architecture
React + Vite UI ASP.NET Core API Azure Service Bus Emulator + SQL Server Highlights
Queue, topic, subscription and DLQ management Docker delivery and OpenTelemetry observability Monaco message editor and real-time statistics View source on GitHub
Generates type-safe property resolvers at compile time, avoiding runtime reflection.
Stack: C#, Roslyn, Source Generators
Annotated C# models drive a Roslyn source generator that emits switch-based property resolvers and a type-safe registry.
Architecture
Annotated C# models Roslyn source generator Generated switch-based resolvers Highlights
Compile-time generation instead of runtime reflection Nullable property support Type-safe resolver registry View source on GitHub
A focused test host for isolated-worker Azure Functions applications.
Stack: C#, .NET, Azure Functions
The reusable test host runs isolated-worker Azure Functions from a test project without requiring a deployed Functions host.
Architecture
Test project Isolated worker test host Azure Function under test Highlights
Designed for isolated-worker Functions Small reusable testing utility Open source under the MIT license View source on GitHub
A practical tracing and collector integration demonstration.
Stack: C#, .NET, OpenTelemetry, Azure Service Bus
An HTTP API publishes messages to the Azure Service Bus Emulator, where four consumers demonstrate distributed trace propagation.
Architecture
HTTP API Azure Service Bus Emulator Four message consumers + Aspire dashboard Highlights
Distributed traces across asynchronous messaging Activity links versus parent context Docker Compose development environment View source on GitHub
Career timeline
2018
AND Digital Associate
2019
NewDay Software Engineer
2021
Checkout.com Software Engineer II
2022
Codat Senior Software Engineer
2023
NewDay Senior Software Engineer