Senior Platform Engineer (C#/.NET) - Lead Architecture

Symmetric Headhunting; Lincoln; On-site; GBP 70,000 - 110,000; Full time

Job summary

Symmetric Headhunting seeks a Senior Software Engineer to own major platform components and drive delivery on a multi-INT data fusion platform. You will stay hands-on in C#/.NET while guiding architectural decisions, mentoring engineers, and maintaining technical quality across your domain.

The role emphasizes secure, scalable software, RESTful APIs, and distributed services, with a focus on architectural alignment and hands-on leadership across teams.

Qualifications

• 3 to 5+ years' professional software development experience.
• Strong C#/.NET and ASP.NET Core expertise.
• Experience building RESTful APIs, distributed systems, or service-based architectures.

Responsibilities

• Own and evolve significant platform components, hands-on in C#/.NET.
• Lead technical direction, design decisions, and cross-team architectural alignment.
• Build and support RESTful APIs and distributed services with ASP.NET Core.
• Design and optimise PostgreSQL relational database solutions for performance and reliability.
• Lead technical investigations, prototypes, and R&D spikes to de-risk delivery.
• Mentor engineers and champion secure development and engineering standards.

Skills

C# / .NET

ASP.NET Core

RESTful APIs

React

Relational databases (PostgreSQL)

Agile delivery

Tools

Git

Docker

SQL (PostgreSQL)

Job description

Symmetric Headhunting seeks a Senior Software Engineer to own major platform components and drive delivery on a multi-INT data fusion platform. You will stay hands-on in C#/.NET while guiding architectural decisions, mentoring engineers, and maintaining technical quality across your domain.

The role emphasizes secure, scalable software, RESTful APIs, and distributed services, with a focus on architectural alignment and hands-on leadership across teams.