Full Stack Software Developer 197637

Harnham; Greater London; On-site; GBP 65,000 - 90,000; Full time

Benefits offered by this job

Performance-related bonus

Private healthcare

Pension

Complex engineering challenges

Collaborative environment

Career growth opportunities

Central London office

Job summary

Harnham is seeking a C# Full Stack Engineer to join a highly technical engineering team in London. You will own substantial projects, influence technical direction, and collaborate with experienced engineers who value high-quality software.

The role covers design, greenfield work, system architecture, and high-performance solutions. You will write clean C#/.NET, work with SQL, and own delivery from design to deployment in a fast-paced environment with clear opportunities for progression.

Qualifications

• Strong commercial experience with C# and .NET.
• Experience with SQL databases and data-driven apps.
• Ability to write clean, maintainable code.
• Knowledge of multi-threading and performance-focused development.
• CS or STEM education.
• Strong problem-solving and communication skills.
• Experience with distributed systems or network programming.
• Experience with Git.
• Interest in continuous learning.

Responsibilities

• Design, build, and maintain applications using C# and .NET.
• Work on greenfield development and existing systems.
• Contribute to system architecture and technical decision-making.
• Develop scalable, high-performance software solutions.
• Collaborate closely with engineers and stakeholders across the business.
• Support performance optimisation and continuous improvement initiatives.
• Take ownership of projects from design through to deployment.

Skills

C# & .NET

Software fundamentals

SQL databases

Clean code

Problem-solving

Continuous learning

Multithreading

Git

Distributed systems

CS degree

Education

CS or STEM degree

Job description

This is an opportunity to join a highly technical engineering team working on complex, performance-driven software in a fast-paced environment. You'll have the chance to take ownership of impactful projects, influence technical direction, and collaborate with experienced engineers who value high-quality software development.

The Company

They are a growing technology-focused business that develops proprietary platforms and automated systems to support data-driven decision making. With a flat structure and collaborative culture, they provide engineers with significant autonomy and direct involvement in key projects.

The business has grown steadily while maintaining strong employee retention and a supportive working environment. Technology plays a central role in their success, creating excellent opportunities for engineers who enjoy solving challenging technical problems.

The Role

As a C# Full Stack Engineer, you will:

• Design, build, and maintain applications using C# and .NET
• Work on a combination of greenfield development and existing systems
• Contribute to system architecture and technical decision-making
• Develop scalable, high-performance software solutions
• Collaborate closely with engineers and stakeholders across the business
• Support performance optimisation and continuous improvement initiatives
• Take ownership of projects from design through to deployment

Your Skills & Experience

• Strong commercial experience with C# and .NET development
• Solid understanding of software engineering fundamentals and best practices
• Experience working with SQL databases and data-driven applications
• Ability to write clean, maintainable, and efficient code
• Strong problem-solving and communication skills
• Demonstrable interest in continuous learning and technical development
• Multi-threaded and performance-focused application development
• Version control tools such as Git
• Distributed systems or network programming experience
• Computer Science or related STEM education

What They Offer

• Performance-related bonus with strong earning potential
• Private healthcare and pension
• Exposure to complex engineering challenges and large-scale projects
• A collaborative, low-hierarchy environment with genuine ownership
• Clear opportunities for career growth and progression
• Office-based role in Central London with flexibility available after onboarding