Senior .NET Engineer — Hybrid (Cardiff), Tech Leader

Accelero; Cardiff; Hybrid; GBP 70,000 - 90,000; Full time

Benefits offered by this job

Private healthcare

Enhanced pension

28 days holiday + bank holidays

Hybrid work model

Job summary

Accelero in Cardiff is seeking an experienced Senior Software Engineer to lead technical direction while writing high-quality code. You’ll mentor engineers, review code, and shape how we build and deliver software in a hybrid Cardiff-based role.

You will own backend design, tackle complex SQL tasks, and drive Azure cloud decisions while collaborating with product stakeholders to translate requirements into robust solutions. A clear path to principal roles awaits.

Qualifications

• Proven senior-level C# / .NET Core experience across complex production systems.
• Deep SQL expertise including design, optimisation and performance.
• Solid cloud platform experience, ideally Azure.

Responsibilities

• Designing and building robust backend services and APIs with C# / .NET Core.
• Owning complex SQL work including schema design, performance tuning and data modelling.
• Driving cloud infrastructure decisions and best practices, primarily on Azure.
• Leading code reviews and championing engineering standards across the team.
• Mentoring and supporting junior and mid-level engineers in their development.
• Taking the lead on technical design and architecture discussions.
• Collaborating with product and stakeholders to translate requirements into solid technical solutions.

Skills

C# / .NET Core

SQL

Cloud experience

Tools

Docker

Kubernetes

CI/CD pipelines

Job description

Accelero in Cardiff is seeking an experienced Senior Software Engineer to lead technical direction while writing high-quality code. You’ll mentor engineers, review code, and shape how we build and deliver software in a hybrid Cardiff-based role.

You will own backend design, tackle complex SQL tasks, and drive Azure cloud decisions while collaborating with product stakeholders to translate requirements into robust solutions. A clear path to principal roles awaits.