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Senior Blazor Developer · Bournemouth or remote, UK

Lead the Blazor front ends behind long-lived business systems

We have built with Blazor since its first release and run it in production for insurance, travel, health and the trades, alongside our own products. This role leads that work on .NET 10 and ASP.NET Core: component architecture, performance, accessibility and the release engineering that keeps a front end safe to change every week for years.

Blazor Server, WebAssembly, Hybrid Blue-green releases on Azure 5+ years .NET, 2+ Blazor AZ-204 required
Before you apply Open
Microsoft Certified associate badge
Microsoft Certified: Azure Developer AssociateHeld and current on the day you apply.Exam AZ-204 · required
  • Two paragraphs about you and your work
  • Your CV, Word or PDF
  • Proof of AZ-204: Microsoft Learn transcript or Credly badge link
  • Email careers@assemblysoft.com
LocationBournemouth or remote, UK
ContractContract, £300–£600 a day
Experience5+ years .NET, 2+ years Blazor in production
CertificationAZ-204 required on application
The work

What you will work on

Blazor on .NET 10

Server, WebAssembly and .NET MAUI Blazor Hybrid applications with ASP.NET Core APIs behind them.

Performance and accessibility

Component libraries, state management, rendering performance, virtualisation and WCAG across large line-of-business screens.

Render modes, chosen deliberately

Static server rendering, streaming and interactive modes per page, not by default.

Release engineering

Blue-green slots on Azure App Service, regression suites that gate every swap, rollback in seconds.

Modernisation

Web Forms, MVC and WPF front ends moved onto Blazor release by release, without a big-bang rewrite.

Mentoring

Reviewing code across the team and raising the bar without raising your voice.

Microsoft Certified associate badge
Microsoft Certified: Azure Developer AssociateExam AZ-204 · required for this role

Held and current on the day you apply. Every engineer applying for a role at Assemblysoft needs a current Microsoft Azure certification, and we verify it on Microsoft Learn or Credly before the first conversation. Include a link to your transcript or badge with your application.

  • Microsoft Certified: DevOps Engineer Expert (AZ-400): Preferred; funded within your first year if not yet held.
  • Microsoft Certified: Azure Solutions Architect Expert (AZ-305): Held and current on the day you apply, with its prerequisite AZ-104.

What we need from you

  • A current Microsoft Certified: Azure Developer Associate (AZ-204), with proof included in your application.
  • 5+ years of C# and ASP.NET, with at least 2 years of Blazor in production.
  • Deep ASP.NET Core knowledge: middleware, authentication, minimal and controller APIs, SignalR.
  • Azure App Service, Azure DevOps pipelines and infrastructure as code (Bicep or Terraform).
  • Automated testing across unit, component (bUnit) and end-to-end (Playwright) levels.
  • The judgement to say when a rewrite is not needed, and to explain why to a client.

Nice to have

  • Microsoft Certified: DevOps Engineer Expert (AZ-400) or Azure Solutions Architect Expert (AZ-305).
  • Oqtane or other modular Blazor frameworks; Telerik, Syncfusion or Radzen component suites.
  • Experience bringing AI-generated codebases up to a production standard.
What we offer

In return

01

Certification funding

Exams, study time and annual renewals for the Microsoft credentials your role needs, and the next tier when you are ready for it.

02

Remote-first, UK

Work from home across the UK with a Bournemouth base to meet in; contract roles, full or part time.

03

Day rate

£300–£600 a day depending on role and experience, and a non-corporate team of senior engineers who review each other's work.

04

Systems that matter

Regulated, business-critical and long-lived: healthcare, insurance, transport, trades. Not throwaway builds.

Apply

How to apply for this role

Applications without proof of the required certification are not progressed, so please include it first time.

1

Two paragraphs and a CV

Who you are, what you have built or supported, and why this role. CV as Word or PDF.

2

Proof of AZ-204

A link to your Microsoft Learn transcript or your Credly badge for Microsoft Certified: Azure Developer Associate. A PDF certificate with a verification code is also accepted.

Required
3

Email it to us

Send everything to careers@assemblysoft.com with the role in the subject line.

4

A conversation with an engineer

Once the certification is verified, a real conversation about real systems, and honest answers to your questions.

Azure certification, required for every role

Azure-certified engineers, verified before we talk

Every engineer applying for a role at Assemblysoft needs a current Microsoft Azure certification. You apply with proof of it, we verify it before the first conversation, and once you join we fund the exams, the study time and the annual renewals for the next tier.

Microsoft Certified Expert badge Expert

Azure Solutions Architect Expert

Exam AZ-305. Required for our architect role and for anyone who signs off an Azure design.

DevOps Engineer Expert

Exam AZ-400. Preferred for engineers who own pipelines, environments and releases.

Microsoft Certified Associate badge Associate

Azure Developer Associate

Exam AZ-204. The minimum for every developer role: ASP.NET Core and Blazor on Azure.

Azure Administrator Associate

Exam AZ-104. The prerequisite for the Solutions Architect Expert certification.

Microsoft Certified Fundamentals badge Fundamentals

Azure Fundamentals

Exam AZ-900. A useful start, but on its own it does not meet the requirement for any of our roles.

Badge artwork © Microsoft Corporation, shown to identify the certifications required. Verify any credential on Microsoft Learn. Proof means a link to your Microsoft Learn transcript or your Credly badge; a PDF certificate is accepted if it carries a verification code.

Start a meaningful conversation with us today.

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