Senior Backend Developer

The Portfolio Group; Manchester; On-site; GBP 50,000 - 70,000; Full time

Job summary

A progressive tech company in Manchester seeks a Senior Backend Developer. You'll enhance core products and design scalable systems in a collaborative environment. Ideal candidates will have over 5 years of experience, expertise in C#, and a passion for mentorship and continuous improvement.

Qualifications

• 5+ years of backend development experience.
• Expertise in C#, .NET (especially .NET 6+), and SQL Server.
• Deep understanding of SOLID and OOP principles.
• Skilled in Git and API development.

Responsibilities

• Enhance features of core products.
• Design scalable backend systems using C#.
• Write clean and testable code.
• Maintain RESTful and GraphQL APIs.
• Mentor junior developers.
• Drive improvements in development processes.

Skills

Backend development experience

C#

SQL Server

Git

Unit Testing

API development

Job description

Overview

The Opportunity

We’re looking for a talented Senior Backend Developer to join a purpose-driven tech team that creates solutions making a real difference in people’s lives. This is more than just a job, it’s a chance to shape systems that support individuals and organisations across the UK and Ireland.

The Role

As a Senior Backend Developer, you’ll be a founding member of a newly formed cross-functional engineering team. You’ll play a key role in setting the tone for the team’s culture, practices, and success. Your technical expertise will shape our architecture and support business-critical applications.

This is a highly collaborative role suited to someone with a passion for software craftsmanship and continuous improvement.

Key Responsibilities

• Enhance features and functionality of core products
• Design and implement scalable backend systems using C# (.NET 5+ preferred)
• Write clean, maintainable, and testable code using TDD/BDD principles
• Create and maintain RESTful and GraphQL APIs
• Collaborate with POs, BAs, and stakeholders to define solutions
• Mentor junior developers and promote best practices
• Drive improvements in development processes and tools

What You Bring

• 5+ years of backend development experience
• Expertise in C#, .NET (preferably .NET 6+), and SQL Server
• Deep understanding of SOLID and OOP principles
• Skilled in Git, Unit Testing (NUnit), and API development
• Familiarity with CI/CD pipelines and agile methodologies
• Strong communication and problem-solving skills
• Desire to grow within a dynamic and evolving team

Why Join?

This is an incredible opportunity to make your mark in a company that prioritises purpose, innovation, and professional growth. You’ll be part of a team where your ideas are welcomed, your development is encouraged, and your work truly matters.

Ready to build something that helps others—and builds your career in the process? Apply today.