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Senior Software Development Engineer in Test

Belfast, Northern Ireland

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 Development Engineer in Test), C9 Trader to take a lead role in ensuring the quality and reliability of our C9 Trader application supporting both mobile and desktop clients. In this role, you will design, develop, and maintain scalable test automation frameworks, collaborate closely with developers, 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, we would 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.

 

 

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Equal Opportunity Monitoring

We are an Equal Opportunities Employer. We aim to provide equality of opportunity to all persons regardless of their religious belief, political opinion, sex, gender reassignment, marital or civil partnership status, pregnancy or maternity, disability, race (including colour, nationality, ethnic or national origins, and Irish Traveller status), age, or sexual orientation. We do not discriminate against job applicants or employees and aim to select the best person for the job.

We monitor the community background and sex of our job applicants and employees in order to demonstrate our commitment to promoting equality of opportunity in employment and to comply with our duties under the Fair Employment and Treatment (NI) Order 1998.

Regardless of whether they actually practice a particular religion, most people in Northern Ireland are perceived to be members of either the Protestant or Roman Catholic communities. We are therefore asking you to indicate your community background by selecting the appropriate option within the Religion field.

You are not obliged to answer the questions on this application and you will not suffer any penalty if you choose not to do so. Nevertheless, we encourage you to answer them. Your identity will be kept anonymous and your answers will be treated with the strictest confidence, separate from the recruitment panel.

If you do not answer the question above, we are encouraged to use the residuary method of making a determination, which means that we can make a determination as to your community background on the basis of personal information supplied by you in your application form. 

Note: If you answer these questions about community background and sex, you are obliged to do so truthfully, as it is a criminal offence under Regulation 20 of the Fair Employment (Monitoring) Regulations (NI) 1999 to knowingly give false answers to these questions.

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