Senior Software Engineer

RSM; Crawley; On-site; GBP 50,000 - 70,000; Full time

Job summary

A leading professional services firm in Crawley is seeking an experienced Senior Software Engineer to join their agile development team. You will design scalable, cloud-native applications using .NET and React / Angular. This role requires taking ownership of development processes, collaborating with cross-functional teammates, and ensuring high-quality user experiences. Strong expertise in .NET, front-end technologies, and Agile methodologies is essential. The position offers an opportunity to lead innovative projects and shape business solutions.

Qualifications

• Strong experience building RESTful APIs and distributed microservices.
• Proficiency in React / Angular, TypeScript, RxJS.
• Experience with user experience (UX) design principles.

Responsibilities

• Design, develop, and maintain .NET microservices and React / Angular frontends.
• Collaborate with product owners and developers in an Agile environment.
• Write clean, maintainable, and testable code.

Skills

Strong experience with .NET

Proficiency in React / Angular

Solid understanding of SQL Server

Strong problem-solving skills

Experience working in Agile teams

Knowledge of SOLID principles

Education

Degree in Computer Science or related field

Tools

Git

Docker

Azure DevOps

Job description

Senior Software EngineerWe are searching for an experienced Senior Software Engineer

Purpose

Join our agile development team at RSM, where you'll help build scalable, cloud-native applications using React / Angular v20 and .NET 8 microservices. You'll work across the full software lifecycle—from architecture and development to deployment and support—delivering high-impact solutions for our clients.

As a full stack developer with a front-end focus, you will spearhead the design and development of transformative solutions that power RSM’s business operations. Your leadership will shape the user-centric experience of our platforms, ensuring that each application delivers intuitive, seamless and consistent interfaces finely tuned to the needs of our clients and stakeholders.

Key Responsibilities

• Design, develop, and maintain .NET microservices and React / Angular frontends.
• Collaborate with product owners, QA engineers, and fellow developers in an Agile environment.
• Take ownership of agile ceremonies and stakeholder engagements with multiple teams across the business.
• Troubleshoot and resolve issues across distributed systems and UI layers.
• Write clean, maintainable, and testable code aligned with modern engineering practices.
• Lead architectural discussions which advocate for scalable, secure, user-centric solutions.
• Work closely with back-end developers for complex AI solutions.
• Support CI / CD pipelines and monitor production systems.
• Ensure consistency in the design of AI solutions.
• Rapid development of POCs for stakeholder feedback.
• Manage the ongoing development, maintenance and scale of the RSM Intellisort application.

Core Skills & Experience

• Strong experience with .NET, building RESTful APIs and distributed microservices.
• Proficiency in React / Angular, TypeScript, RxJS, and modern frontend tooling.
• Solid understanding of SQL Server, Entity Framework Core, and data modelling.
• Familiarity with Git, CI / CD pipelines, and automated testing.
• Knowledge of SOLID principles, Clean Architecture, and design patterns.
• Experience working in Agile teams using Scrum or Kanban.
• Strong problem-solving skills and ability to work independently.
• Experience with user experience (UX) design principles.
• Skilled in the architectural design, development and deployment of enterprise-level, data-driven applications.

Desirable Skills

• Experience with Azure services (App Services, Functions, Key Vault, etc.).
• Exposure to containerisation (Docker, Kubernetes).
• Familiarity with message queues (, RabbitMQ, Azure Service Bus).
• Understanding of security best practices and OWASP Top 10.
• Experience with TDD, BDD, and testing frameworks (, xUnit, Jasmine / Karma).
• Knowledge of DevOps tools like Azure DevOps, GitHub Actions, or Terraform.
• Awareness of AI / ML concepts and their application in enterprise software.
• Degree in Computer Science or related field (or equivalent experience).