Principal Software Engineer

Reed Technology; Newcastle upon Tyne; Hybrid; GBP 65,000 - 85,000; Full time

Job summary

A leading technology firm in Newcastle upon Tyne seeks a Principal Software Engineer to lead the migration and modernisation of a complex legacy application into a scalable architecture. In this hybrid role, you'll guide a team, influence design decisions, and work with modern technologies including C#, .NET, SQL, Web APIs, and React. The position offers an attractive benefits package and opportunities to influence architecture. If you're passionate about driving change, apply now.

Benefits

Attractive benefits package

Flexible hybrid working

Pension scheme

Qualifications

• Proven experience in application modernisation and migration projects.
• Hands-on expertise in C#, .NET, SQL, and Web APIs.
• Strong background in microservice architecture and design patterns.

Responsibilities

• Drive migration of legacy systems to modern, cloud-based solutions.
• Define and implement microservice architecture using a code-first approach.
• Collaborate with a cross-functional team for integration.

Skills

C#

.NET

SQL

Web APIs

Microservice architecture

React

Cloud experience (Azure/AWS)

Leadership skills

Job description

About the Role

We're looking for a Principal Software Engineer to lead the migration and modernisation of a complex legacy application into a modern, scalable architecture. This is a hands‑on technical role where you'll shape the design, guide the team, and ensure successful delivery of a critical transformation project.

Key Responsibilities

• Drive the migration of legacy systems to modern, cloud‑based solutions.
• Define and implement microservice architecture using a code‑first approach.
• Apply strong architectural principles and design patterns to deliver robust solutions.
• Collaborate with a cross‑functional team (including React developers) to ensure seamless integration of front‑end and back‑end.
• Get hands‑on with C#, .NET, SQL, Web APIs, and React for complex feature development.
• Build credibility through technical expertise and lead the team in pushing designs forward.
• Work on features that require deep integration with multiple third‑party applications.

What We're Looking For

• Proven experience in application modernisation and migration projects.
• Strong background in microservice architecture and design patterns.
• Hands‑on expertise in C#, .NET, SQL, and Web APIs.
• Cloud experience (Azure preferred, AWS considered).
• Knowledge of front‑end technologies (ideally React but not essential).
• Ability to understand and guide front‑end work within the overall architecture.
• Evidence of delivering complex technical solutions and influencing design decisions.
• Excellent communication and leadership skills to inspire and guide a team.

Interview Process

• Introductory Call with the Hiring Manager: review CV, discuss role, answer questions.
• Take‑home Technical Task.
• Face‑to‑Face Interview at the Newcastle office.

Why Join Us?

• Excellent benefits package including an attractive pension scheme.
• Be at the forefront of a major transformation project.
• Work with modern technologies and cloud platforms.
• Hybrid working with flexibility.
• Opportunity to influence architecture and technical direction.

Interested? Apply now