Senior Software Engineer, Full Stack (C# (.NET)

Greenhouse Software, Inc.; Belfast City District; On-site; GBP 80,000 - 120,000; Full time

Job summary

TRG Screen is seeking a Senior Software Engineer, Full Stack (C# .NET) based in Belfast, Northern Ireland. You will design, develop, and evolve backend services and frontend applications across our enterprise product suite, blending new feature work with modernization of legacy systems.

The role emphasises hands-on work and the use of AI tooling throughout the development lifecycle. You will contribute to architecture discussions, implement clean code, champion automated testing, and mentor

Qualifications

• 5+ years of experience as a Full Stack Developer on the Microsoft stack.
• Strong C# and .NET experience building enterprise backend systems.
• Relational DB experience (SQL Server or PostgreSQL).
• Familiarity with Git, Docker, and cloud platforms (AWS or Azure).

Responsibilities

• Design, develop, and maintain backend services and frontend applications across TRG Screen products.
• Participate in the full SDLC – requirements analysis, design, implementation, testing, deployment, and post-release support.
• Own features end-to-end across the full stack.
• Mentor junior engineers and contribute to team knowledge sharing.
• Produce technical documentation such as design specifications and runbooks.

Skills

C#

.NET

SQL

Git

Docker

AWS

Azure

Communication

Job description

Senior Software Engineer, Full Stack (C# (.NET))

Belfast, Northern Ireland, United Kingdom

Join TRG Screen: Building World-Class Teams. One Expert at a Time.

Are you ready to be part of a dynamic team at the forefront of subscription spend management innovation?

At TRG Screen, we're not just redefining how organizations manage their subscription expenses - we're shaping the future of the industry. With cutting-edge solutions and a commitment to excellence, we empower businesses around the globe to optimize their subscription investments and drive sustainable growth.

Join us in our mission to revolutionize subscription management and make a meaningful impact on the way businesses access and utilize critical information. At TRG Screen, your talent and ambition will find a home, where opportunities for growth and advancement abound.

About TRG Screen

TRG Screen is the leading provider of market data and subscription management technology and automation solutions, tailored to the unique needs of financial institutions and legal firms. Our integrated suite of solutions includes market data and subscription spend management, usage management, compliance reporting, and comprehensive managed services, which hundreds of clients worldwide use to remove cumbersome and inaccurate manual processes and gain control over market data and subscription costs at scale. For more than 25 years, TRG Screen has enabled businesses who rely on market data to monitor and strategically manage spending and usage of data and information services, including market data, research, software licenses, consulting and other necessary corporate expenses. TRG Screen solutions give decisionmakers full transparency into subscription spend and usage, enabling them to proactively manage subscription costs at scale, conduct more informed vendor negotiations, improve governance, and avoid unnecessary spending on these mission-critical business services. TRG Screen is headquartered in New York City, with offices in Europe and Asia, as well as a 24x7 client support center in Bangalore, India.

TRG Screen is a portfolio company of Vista Equity Partners, one of the world’s largest and most respected private equity firms.

Position: Senior Software Engineer, Full Stack (C# (.NET))

Location: Belfast

Team: Activity Monitor

The Role

We are seeking a Senior Full Stack Software Engineer (.NET) to join TRG Screen’s engineering team. You will design, develop, and evolve backend services and frontend applications across our enterprise product suite - a hands-on role that blends new feature development with improving and modernising complex, established systems. TRG Screen is an AI-driven engineering organisation; this role is expected to use AI tooling by default across the full development lifecycle.

Responsibilities

Development & Delivery

• Design, develop, and maintain backend services and frontend applications for TRG Screen products, including modernisation and maintenance of legacy code.
• Participate in the full SDLC - requirements analysis, design, implementation, testing, deployment, and post-release support.
• Operate independently on complex tasks, owning features end-to-end across the full stack.
• Participate in code reviews, providing constructive feedback and ensuring adherence to clean code principles.
• Troubleshoot and resolve complex software issues across backend and frontend.
• Use AI tooling as standard practice across design, implementation, code review, and testing to improve quality and delivery speed.

Technical Leadership

• Contribute to architecture discussions and technical decision-making.
• Apply clean code principles and design patterns to deliver maintainable, scalable systems.
• Champion automated testing practices and contribute to system reliability, performance, and security.
• Actively adopt AI-driven development practices and contribute to their adoption within the team.
• Produce technical documentation such as design specifications and runbooks.
• Collaborate effectively with product managers, QA, UX designers, and other stakeholders.
• Mentor junior engineers and contribute to team knowledge sharing.
• Contribute to team knowledge through pairing and documentation.
• Communicate clearly on technical topics with both technical and non-technical stakeholders.
• Participate in sprint planning, estimation, and continuous process improvement.

Required Skills and Qualifications

• 5+ years of professional experience as a Full Stack Developer using the Microsoft stack.
• Strong experience with C# and .NET, building enterprise-grade backend systems.
• Strong database skills with relational databases (SQL Server or PostgreSQL preferred).
• Solid understanding of clean code principles, design patterns, and testing practices.
• Familiarity with Git, Docker, and cloud platforms (AWS or Azure).
• Excellent communication and collaboration skills.

Preferred

• Exposure to microservices architecture and API design.
• Experience with messaging systems (e.g., Kafka, RabbitMQ, NATS).
• Experience with CI/CD pipelines and DevOps practices.
• Experience using AI-driven development tools (e.g., Claude Code, Cursor, GitHub Copilot) to enhance productivity and code quality.
• Familiarity with spec-driven development - using structured specifications to guide AI coding agents and validate generated output (e.g., BMAD, GitHub Spec-Kit).
• Familiarity with financial services or research technology domains.

Join TRG Screen and unlock your potential in an environment where innovation thrives, opportunities abound, and your contributions make a difference. We are an equal opportunities employer. We recognise and value the power of diversity in our workplace and are committed to being an employer of choice for everyone. We welcome and encourage applicants from all backgrounds. All applications for employment are considered strictly on the basis of merit.

At TRG Screen, we understand that diverse and inclusive teams are not just beneficial, they are essential to our success. We recognize that embracing diverse perspectives, backgrounds, and experiences foster innovation, enhances problem-solving capabilities, and drives better business outcomes. By cultivating a culture of inclusion where every voice is heard and valued, we empower our world class teams to thrive, excel, and drive positive change.

We are proud of our diverse workforce and are dedicated to creating a safe and welcoming environment for all employees. People from various ethnicities, ages, genders, and abilities are encouraged to apply.

Privacy Notice for Applicants

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We encourage all applicants to review our Privacy Policy to understand how we collect, use, and protect your personal data throughout the recruitment process. Our Privacy Policy is available at: www.trgscreen.com/privacy-policy .

By submitting an application, you acknowledge that you have read and understood our Privacy Policy.