Contract Software Engineering
& Architecture

Senior engineering consultancy with 28 years of experience delivering complex, long-running systems across enterprise .NET, Azure, and integration platforms.

Cornwall, UK  ·  Available for contract & consulting

28 Years' experience
11+ Years, longest engagement
5+ Long-term engagements

Engineering expertise you can rely on

Tridian Software provides senior software engineering and architecture consultancy services. Our principal engineer, Trystan Negus, brings nearly three decades of professional experience designing and delivering complex software systems - from greenfield architecture through to the careful modernisation of long-lived production platforms.

Tridian Software works best in substantive, high-trust engagements where deep understanding of a client's system compounds into lasting value. Our strongest area is enterprise .NET on Azure: messaging pipelines, identity integrations, data architectures, and full-stack web applications built to stand up to years of production use.

Available for contract and consulting engagements.

C# / .NET ASP.NET Core Minimal APIs Microservices Microsoft Azure Azure Service Bus SQL Server WPF / MVVM Entity Framework GitHub Actions Redis Okta / Entra
Full-stack engineering

Backend services, APIs, data layers, and frontend UI - spanning the full depth of an application.

Long-term partnership

Our typical engagements run for years - we invest in understanding your system and your team's goals.

Security & quality focus

Production-hardened code. SOLID principles, dependency audits, vulnerability remediation, and thorough testing.

What we deliver

Focused on the areas where deep, sustained expertise makes the most difference.

Software Architecture & Design

Enterprise application architecture, event-driven messaging, service-oriented design, distributed systems, and RESTful API design. Greenfield and brownfield.

  • System design & technical specification
  • Clean architecture & SOLID principles
  • Messaging pipeline design
  • Database schema design

.NET & Azure Development

Full-stack .NET development across modern .NET and .NET Framework, with deep Azure platform experience across the services that matter most to enterprise applications.

  • C# / ASP.NET MVC / WPF
  • Azure App Services, SQL, Service Bus
  • Azure Blob Storage, Redis
  • Entity Framework & LINQ

Enterprise Integration

Designing and building the connective tissue between enterprise systems - from SAP and ERP interfaces to identity platform migrations and third-party API integrations.

  • Azure Service Bus pipelines
  • SAP / ERP interfaces & EDI
  • Identity platform migration (Okta, Entra)
  • REST & WCF service integration

Legacy Modernisation

Careful, incremental modernisation of production platforms - .NET Framework to modern .NET, architectural refactoring, security remediation, and dependency upgrades without disruption.

  • .NET Framework → modern .NET migration
  • Progressive architectural refactoring
  • Dependency & security auditing
  • Risk-managed production upgrades

Technical Consulting

Architectural review, technology evaluation, due diligence on existing systems, and strategic technical input for teams navigating a significant design or migration decision.

  • Architectural review & recommendations
  • Technology selection & evaluation
  • Codebase due diligence
  • Team mentoring & code review

Bespoke Software Delivery

End-to-end delivery of custom software products - from requirements through architecture, development, testing, and deployment, including client-facing relationship management.

  • Full SDLC ownership
  • Desktop & web application development
  • CI/CD pipeline setup
  • Ongoing maintenance & evolution

Long-term engagements

We build lasting relationships with clients - not just systems.

Global Music & Media
11+ years

Enterprise Manufacturing Platform

Full-stack engineering on a large-scale Azure-hosted web application managing end-to-end physical media product manufacturing for a major global label group. Continuously active for over 11 years on a mature, high-stakes codebase.

Inbound enterprise message processing architecture (SAP / Azure Service Bus)
Identity platform migration to Okta
Real-time notification framework (Redis-backed)
CRM, asset registry integration, security stewardship
C#ASP.NET MVCAzureService BusAngularJSEntity FrameworkOktaRedis
Spirits Industry
12 years

Commercial Spirit Planning Suite

Principal developer and technical lead on a commercial WPF desktop application for bulk spirit planning and management, taken on from an outsourcing company and evolved continuously across a 12-year engagement. Delivered multiple major feature releases and a full .NET modernisation.

Multiple Planning Scenarios framework
Warehouse & cask movement module
BI Dashboard product (.NET 8 / DevExpress)
Progressive .NET Framework → .NET migration
C#WPF / MVVMASP.NET CoreSQL ServerDevExpress.NET 8WCFGitHub Actions
Education Technology
8 years

School Income Management Platform

Core contributor to a large software suite deployed across hundreds of schools nationwide. Designed and delivered multiple foundational components including the guaranteed-delivery sync engine, e-payment website, and the automated upgrade distribution system.

Guaranteed-delivery bidirectional sync engine
e-Payment website with WorldPay integration
Finance & banking module
VB6 → VB.NET desktop migration
JavaSpringExtJSVB.NETPostgreSQLSQL Server

What clients say

Trystan has been at the core of several of my development teams - he is consistently professional, well-informed, productive, responsive, and delivers on time to high quality repeatedly. Regardless of the software technology, Trystan can be trusted with the toughest of tasks.

Marcus Whitfield Entrepreneur & co-founder, Tucasi Ltd

An extremely skilled software engineer who is able to contribute to a project at both the highest requirements and design phases, as well as getting his hands dirty with the nitty gritty coding and testing. He also shows great flexibility in fitting in with a client's team structure and working practices.

Rajpal Dhillon Entrepreneur & co-founder, Tucasi Ltd

Trystan has designed & executed a number of projects for DataBasics, and these have always been completed on-time and to an exceptional standard. His ability to break a problem down to manageable components is outstanding. We would recommend his work whole-heartedly.

Andrew Risely CEO, DataBasics Ltd

Let's talk about your project

Tridian Software is available for contract and consulting engagements. Whether you have a specific project in mind or want to explore how we might help, we'd be glad to hear from you.

Cornwall, UK · Remote contracts welcome · Available now