Manual QA Engineer - Cybersecurity Scale-up!

MCS Group; Belfast; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A fast-growing cybersecurity scale-up in Belfast is seeking a Senior QA Engineer to ensure end-to-end quality across their product stack. You will work closely with engineering and product teams to perform manual testing and design test plans. The ideal candidate has over 5 years of experience in QA, with strong expertise in testing web, APIs, and mobile platforms. This position offers a competitive salary, unlimited PTO, and flexible working options while requiring occasional commuting to the Belfast office.

Benefits

Highly Competitive base salary

Unlimited PTO

Pension contribution

Ownership of product direction

Flexible working options

Qualifications

• 5+ years' experience in QA, ideally in a senior or lead capacity.
• Strong background in manual testing across web, API, and mobile platforms.
• Experience testing RESTful APIs.
• Understanding of structured data (e.g. JSON, CSV) and backend validation.
• Working knowledge of SQL for basic data checks.
• Strong attention to detail and clear documentation skills.
• Comfortable working in a fast-paced, changing environment.
• Confident collaborating across multiple teams.

Responsibilities

• Execute manual testing across web applications, APIs, and mobile apps.
• Design and maintain test plans, test cases, and regression suites.
• Perform exploratory and edge-case testing.
• Validate data accuracy and integrity across backend systems.
• Test REST APIs using tools such as Postman.
• Log, track, and triage defects with engineering teams.
• Support release cycles and act as a quality gate.
• Promote QA best practices and continuous improvement.

Skills

Manual testing

SQL

RESTful APIs

Attention to detail

Collaboration across teams

Job description

MCS Group are delighted to be working EXCLUSIVELY with a fast-growing cybersecurity scale-up specialising in modern mobile security and device protection. Their platform helps organisations keep employee devices safe by identifying vulnerabilities, risky settings, outdated software, and potential indicators of compromise - then guiding users through simple steps to fix them.

They're addressing a major gap in the market by treating mobile devices with the same level of security and visibility as traditional enterprise endpoints. The company is well-funded, backed by strong industry partners, and has a clear long-term roadmap.

The Belfast engineering team is at the heart of the product - working on core integrations, backend systems, and complex technical challenges that have real impact on the overall platform.

The role

We're looking for a Senior QA Engineer to take ownership of end-to-end quality across the product stack. You'll work closely with engineering and product teams to ensure new features are reliable, well-tested, and ready for release.

This is a hands-on role with real influence over testing strategy, release readiness, and overall product quality.

Key Responsibilities

• Execute manual testing across web applications, APIs, mobile apps (iOS & Android), and backend services
• Design and maintain test plans, test cases, and regression suites
• Perform exploratory and edge-case testing
• Validate data accuracy and integrity across backend systems and pipelines
• Test REST APIs using tools such as Postman or similar
• Log, track, and help triage defects with engineering teams
• Support release cycles and act as a quality gate before deployment
• Promote QA best practices and continuous improvement

Requirements

• 5+ years' experience in QA, ideally in a senior or lead capacity
• Strong background in manual testing across web, API, and mobile platforms
• Experience testing RESTful APIs
• Understanding of structured data (e.g. JSON, CSV) and backend validation
• Working knowledge of SQL for basic data checks
• Strong attention to detail and clear documentation skills
• Comfortable working in a fast-paced, changing environment
• Confident collaborating across multiple teams

What's in it for you?

• Highly Competitive base salary, flexible dependant on experience.
• Unlimited PTO
• Pension contribution
• Steer the direction of a soon to be multi-award-winning product worldwide
• Ownership and freedom to put your own stamp on the work you do
• Join a team where all ideas are encouraged and welcomed
• Flexible working and remote working options - Must be able to commute to Belfast office at least once a week.

To speak in absolute confidence about this opportunity please contact Rachael Walker, IT Recruitment Manager at MCS Group02896935487or click the apply button below.

If this position is not right for you, we have others that are.

Please visit MCS Groupwww.mcsgroup.jobsto view a wide selection of our current jobs or give us a call028 9023 5456.

All conversations will be treated in the strictest of confidence.