Senior Umbraco .NET Lead - Hybrid Web Apps

Onyx-Conseil; Spalding; Hybrid; GBP 45,000 - 55,000; Full time

Benefits offered by this job

Holiday

Pension

Job summary

Onyx-Conseil in Spalding, UK, is seeking a Senior Umbraco .NET Developer to own full‑stack projects, influence technical decisions, and deliver modern web applications using C#, .NET Core and Umbraco CMS.

The role includes work on greenfield and existing systems, designing REST APIs, integrating third‑party services, mentoring peers, and helping define development standards for enterprise CMS solutions in a hybrid setup (three days on-site).

Qualifications

• Strong commercial experience with Umbraco CMS development.
• Proven background with C#, .NET / .NET Core and ASP.NET Core.
• Full-stack development experience including HTML, CSS/SCSS and JavaScript.
• Experience with SQL Server, Entity Framework and API integrations.
• Ability to troubleshoot complex technical issues and deliver scalable solutions.
• Desirable experience with Azure, Azure DevOps, CI/CD or modern JavaScript frameworks.

Responsibilities

• Develop and maintain web applications using C#, .NET Core and ASP.NET Core.
• Build and enhance websites and platforms using Umbraco CMS.
• Design and integrate REST APIs and third-party systems.
• Contribute to architecture, technical design and development standards.
• Support, modernise and optimise existing applications and platforms.
• Mentor and provide technical guidance to other developers.

Skills

Umbraco CMS

C#

ASP.NET Core

Full-stack

HTML CSS JS

SQL Server

Azure DevOps

Tools

Azure DevOps

Git

Job description

Onyx-Conseil in Spalding, UK, is seeking a Senior Umbraco .NET Developer to own full‑stack projects, influence technical decisions, and deliver modern web applications using C#, .NET Core and Umbraco CMS.

The role includes work on greenfield and existing systems, designing REST APIs, integrating third‑party services, mentoring peers, and helping define development standards for enterprise CMS solutions in a hybrid setup (three days on-site).