.NET Technical Lead

Tryzens Limited is a fast growing IT solutions consultancy based in the City of London with offices in Bulgaria, India, Australia and United States. Our areas of expertise include delivery of eCommerce solutions, multi-channel retail solutions and project management amongst others. We provide best of breed solutions and services to several blue chip clients primarily within retail, financial services and other industries. We have built our delivery focused reputation upon technical innovation, in-depth business knowledge, and creative vision, all of which supports our objective of helping clients to gain true value from eCommerce. We love what we do and our clients love our work.

We are seeking a .NET Technical Lead with a strong background in building scalable, high-performance .NET systems and leading development teams. The ideal candidate will combine deep technical expertise in Azure cloud services, microservices architecture, and complex transactional systems with proven leadership skills in mentoring developers, driving architectural decisions, and owning delivery quality. Experience with wine, alcohol, or collectibles trading platforms is highly desirable, along with a strong understanding of integration with external data providers and event-driven messaging systems.

Key Responsibilities

• Lead the design, development, and maintenance of high-performance microservices using .NET 8.0+ and Azure Functions v4 (isolated worker model), spanning Cellar Services, Market Valuation, and Exchange domains
• Own architectural decisions for the platform, including service decomposition, API design, data modelling, and handler-based vertical slice architecture patterns
• Architect and oversee integrations with external APIs and data providers (Wine-Searcher, Liv-ex, Adobe Commerce, Algolia) using Refit-based typed HTTP clients with delegating handlers for authentication
• Design and optimise event-driven workflows using Azure Service Bus topics and subscriptions for notifications, auto-matching, and asynchronous processing
• Collaborate with product managers, UI/UX designers, QA teams, and cloud engineering to deliver high-quality solutions across multiple environments (dev, QA, UAT, production)
• Drive platform scalability, maintainability, and performance through clean architecture, resilience patterns (Polly retry/circuit breaker policies), and Redis caching strategies
• Lead and mentor a team of .NET developers, establishing engineering standards, conducting code reviews, and fostering a culture of technical excellence through Architecture Decision Records (ADRs) and comprehensive documentation
• Champion testing strategy and code quality, including unit, integration, and API tests using Postman, xUnit,  and NSubstitute
• Define and enforce CI/CD pipeline standards using Azure DevOps YAML pipelines, including multi-stage build, test, and deployment workflows across dev, QA, UAT, and production environments
• Collaborate on infrastructure-as-code practices using Azure Bicep templates for environment provisioning, including Function Apps, SQL Database, Redis Cache, Service Bus, and Key Vault
• Own the observability strategy including Application Insights, OpenTelemetry, Serilog structured logging, and health check endpoints
• Design and maintain Blazor Server applications (Admin UI / Support Hub) for internal administration and support tooling
  

• 8–10+ years of professional development experience with C# and the .NET platform (.NET 8.0 or later), with at least 3 years in a technical lead or senior architectural role
• Strong experience with Azure Functions (isolated worker model), including timer triggers, Service Bus triggers, and HTTP triggers
• Deep understanding of RESTful APIs, asynchronous programming, microservices architecture, and clean architecture patterns (repository pattern, dependency injection, middleware)
• Hands-on experience with Azure cloud services: SQL Database, Redis Cache, Service Bus, Key Vault, Application Insights, and App Service Plans
• Proven experience with Entity Framework Core including migrations, complex queries, and database seeding strategies
• Understanding of authentication and authorisation patterns: Azure AD B2C, OAuth 2.0, and OpenID Connect
• Solid knowledge of SQL Server, relational database design, and ORMs (Entity Framework Core)
• Experience designing and managing Azure DevOps CI/CD pipelines (YAML-based, multi-stage, multi-environment) with Git version control and agile leadership including sprint ceremonies and backlog refinement
• Experience with infrastructure-as-code (Azure Bicep or ARM templates) for multi-environment provisioning
• Experience with resilience frameworks such as Polly for retry, circuit breaker, and timeout policies

Nice to Have

• Domain knowledge or personal interest in wine/alcohol trading or collectibles
• Experience with Blazor Server (or Blazor WebAssembly), Fluent UI components, React, or Vue.js
• Experience with .NET Aspire for local orchestration and service discovery
• Experience with Serilog structured logging, OpenTelemetry, and performance benchmarking (BenchmarkDotNet)
• Familiarity with FluentValidation, AutoMapper, and Scrutor for dependency injection assembly scanning
• Knowledge of Central Package Management (Directory.Packages.props) and NuGet feed management

• Competitive salary and performance-based bonuses
• Remote-friendly culture with flexible working hours
• Opportunity to shape engineering culture and influence technical direction on a well-architected platform with comprehensive documentation, ADRs, and mature DevOps practices
• Collaborative, fast-paced team focused on quality and user experience
• Professional development support and learning opportunities