Senior Dotnet Developer

Senior Application Services Developer

Brennan. Where true performance thrives.

At Brennan, we believe that how technology is delivered is every bit as important as what the technology is. We focus on creating real and relevant value for customers with solutions that fit their specific needs and always reflect their true interests. It’s a claim backed by our True Performance System – a way of working engineered to get us closer, and deliver better, for our customers and their actual experience of technology.

Why join Brennan

True performance for our customers starts with a true belief in our people.

It’s why we’ve structured our business to help our teams, and their talents, shine bright. It's why we’ve created a workplace where people of all backgrounds, beliefs and experiences are welcomed and empowered. And it’s why we’ve built an organization where real innovation makes a genuine impact and generates true rewards for our team members.

True rewards

In addition to competitive remuneration, Brennan offers extensive benefits, including :

• Training and certification bonuses
• Culture Awards that recognize excellence
• Brennan Daredevils – our annual, all-expenses paid trip awarded to our top performers and outstanding contributors
• Vibrant, fun social activities.
• An environment that embraces learning and development

The Role

The Senior Application Services Developer plays a key role in supporting and enhancing our customers’ applications as part of our Managed Application Services team. You will be responsible for maintaining strong relationships with clients through regular health checks, performance reviews, and proactive engagement to ensure their applications remain secure, reliable, and effective.

This role combines hands-on technical support, development, and problem-solving with leadership and mentoring responsibilities within the team. You will provide expert-level troubleshooting, design and implement solutions, estimate work effort, and produce technical documentation — all while sharing knowledge and guiding junior developers to drive continuous improvement.

Role Responsibilities

Key Competencies and Qualifications required

Brennan is an equal opportunity employer.