Senior .NET Backend Architect

Optix Software Ltd; York and North Yorkshire; Hybrid; GBP 75,000 - 110,000; Full time

Benefits offered by this job

Hybrid working

Influence over backend architecture,工程

Modern engineering tools

25 days holiday

Vitality Health, Life Assurance

Pension

Cycle to Work Scheme

On-site parking

Regular socials

Job summary

Optix Software Ltd in York is seeking a senior .NET backend developer to help transform a large Windows desktop platform into a modern web product. You will design .NET services and APIs, turn complex legacy behaviour into maintainable solutions, and raise engineering practices across the team.

This hands-on role demands architectural judgement, leadership of engineers through changes, and a disciplined approach to AI-assisted development.

Qualifications

• Experience designing and operating production APIs and services with C#, modern .NET and ASP.NET Core.
• Strong architectural judgement across service boundaries, data ownership, integrations, scalability and maintainability.
• Experience with SQL, relational databases and evolving data-intensive backend systems.
• Good software design, dependency injection, automated testing and maintainable code.
• Ability to understand large codebases and translate complexity into clear technical approaches.
• Disciplined AI-assisted development including context management, security and testing.
• Experience leading engineers through architectural or tooling change with clear decisions and coaching.
• Strong communication and stakeholder-management skills.

Responsibilities

• Design and implement complex backend functionality using C# and modern .NET / ASP.NET Core.
• Communicate pragmatic architectural decisions across services, data and integrations.
• Modernise WinForms functionality into a service-based web architecture.
• Collaborate with engineers, product and stakeholders to shape solutions.
• Lead by example with AI tools across the software lifecycle while owning outcomes.
• Set high standards for maintainability, testing, security and observability.
• Investigate and resolve complex production issues.

Skills

C#

ASP.NET Core

API design

Architectural judgement

SQL

Automated testing

Dependency injection

AI-assisted development

Leadership

Tools

Kubernetes

Docker

PostgreSQL

Redis

Elasticsearch

GraphQL

Grafana

OpenTelemetry

Prometheus

CI/CD

RabbitMQ

Job description

Optix Software Ltd in York is seeking a senior .NET backend developer to help transform a large Windows desktop platform into a modern web product. You will design .NET services and APIs, turn complex legacy behaviour into maintainable solutions, and raise engineering practices across the team.

This hands-on role demands architectural judgement, leadership of engineers through changes, and a disciplined approach to AI-assisted development.