Senior Software Development Engineer in Test

Symphony; Belfast City District; On-site; GBP 52,000 - 62,000; Full time

Benefits offered by this job

Competitive benefits

BYOB perk

Team events & development

Job summary

Symphony in Belfast is seeking a Senior SDET to lead quality for the C9 Trader application across mobile and desktop clients. You will design, implement, and maintain scalable test automation and drive shift-left testing with developers.

Bring frontend/backend testing expertise, white box strategies, and cloud experience (GCP/AWS, Kubernetes). The role requires 5+ years in software testing with strong C# and TypeScript skills; base salary range 52,000–62,000 GBP yearly.

Qualifications

• 5+ years of experience in software testing or SDET roles, with a strong focus on backend systems.
• At least 2+ years in a senior or lead capacity, driving quality initiatives at scale.
• Strong programming skills in C# and TypeScript (as nice to have).
• Hands-on experience in white box testing of APIs, services, WebSocket connections, and backend systems.

Responsibilities

• Take ownership of quality initiatives for C9 Trader components supporting mobile and desktop clients.
• Design, implement, and maintain test automation frameworks in frontend/backend and white box testing to validate APIs, services, and integrations.
• Work closely with developers to enable shift-left testing practices and embed quality earlier in the development lifecycle.
• Ensure reliable test execution across Cloud (GCP/AWS), Kubernetes, and Windows 10/11 environments, including physical Hardware lab PCs.
• Collaborate across teams and product lines to drive quality alignment and consistency.
• Mentor other SDETs and contribute to continuous improvement of test strategies, processes, and tools.

Skills

C#

TypeScript

SDET

Automation testing

Lead & mentoring

Education

Bachelor’s or Master’s in Computer Science/Software Engineering

Tools

GCP

AWS

Kubernetes

CI/CD

Git

Job description

About us @Symphony

Secure. Connected. Intelligent.

Symphony is an AI-powered communication and technology company fueled by interconnected platforms: messaging, voice, directory and analytics.

Our end-to-end encrypted technologies enable over 1,400 institutions to accelerate AI impact, prioritize data security, navigate complex regulatory compliance and optimize business interactions.

Role Description:

We are looking for a highly skilled and motivated Senior SDET (Software DevelopmentEngineer in Test), C9 Trader to take a lead role in ensuring the quality and reliability of our C9Trader application supporting both mobile and desktop clients. In this role, you will design,develop, and maintain scalable test automation frameworks, collaborate closely withdevelopers, and drive a shift-left testing mindset within the engineering teams.

As a technical quality leader, you will bring strong expertise in frontend/backend testing, white box testing, and development practices. You will play a key role in supporting the execution of the C9 Trader Test Strategy, coordinating across teams and products, and ensuring the delivery of robust, secure, and performant backend solutions.

If you are passionate about e2e quality, test automation, and engineering excellence, wewould love to hear from you!

Responsibilities:

• Take ownership of quality initiatives for C9 Trader components supporting mobile and desktop clients.
• Design, implement, and maintain test automation frameworks in frontend/backend and white box testing to validate APIs, services, and integrations.
• Work closely with developers to enable shift-left testing practices and embed quality earlier in the development lifecycle.
• Ensure reliable test execution across Cloud (GCP/AWS), Kubernetes, and Windows 10/11 environments, including physical Hardware lab PCs.
• Collaborate across teams and product lines to drive quality alignment and consistency.
• Mentor other SDETs and contribute to continuous improvement of test strategies, processes, and tools.

Required Qualifications

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or related field (or equivalent practical experience).
• 5+ years of experience in software testing or SDET roles, with a strong focus on backend systems.
• At least 2+ years in a senior or lead capacity, driving quality initiatives at scale.
• Strong programming skills in C# and TypeScript (as nice to have).
• Proven experience with frontend/backend testing and automation frameworks.
• Hands-on experience in white box testing of APIs, services, WebSocket connections, and backend systems.
• Familiarity with Windows 10/11 environments.
• Experience with cloud environments (GCP/AWS), Kubernetes, CI/CD pipelines, Git, and backend testing tools.

Compensation:

• Salary Range: 52,000 - 62,000 base salary per year
• Bonus Plan

Benefits and Perks:

• Regional specific competitive benefits
• Build your own Benefits (BYOB) perk
• Local events, team building, and development opportunities

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment.