Senior Engineer in Test in Belfast

HALOS is an advanced body camera and cloud software scaleup, working with some of the biggest names in security, services, and law enforcement. At HALO, we're passionate about safety and innovation, constantly staying ahead of threats and reducing risk. What sets HALOS apart is not just the cutting-edge technology we develop but the culture we've nurtured. Our team embodies openness, transparency, and a "one team" spirit. We're a group of passionate individuals, all working on exciting and impactful projects. Here, you'll find an environment that fosters collaboration, creativity, and a shared sense of purpose.

We are seeking a Senior Engineer in Test to join HALOS and take ownership of our testing strategy and execution across the organisation. This is a senior, hands-on role with broad influence over how quality is built into our systems, not just verified at the end. You will be responsible for improving, scaling, and promoting our automated testing approach end-to-end, working closely with backend engineers, DevOps, and product teams. This role is ideal for an experienced test engineer with a strong engineering background who is comfortable designing frameworks, writing production-quality test code, and driving a shift-left quality culture.

What you’ll work on

• Test Strategy & Ownership
  • Own and evolve HALOS’ automated testing strategy across unit, integration, system, and end-to-end testing.
  • Take responsibility for the quality bar of the platform, ensuring testing is comprehensive, reliable, and scalable.
  • Identify gaps in the current test suite and prioritise improvements that deliver the greatest risk reduction.
  • Champion testing best practices and help embed quality thinking across engineering teams.
• Automated Testing & Frameworks
  • Design, build, and maintain robust automated testing frameworks with minimal supervision.
  • Extend and improve our existing Typescript Playwright-based end-to-end test suite.
  • Build and maintain integration and API-level tests for Java Spring microservices.
  • Ensure test suites are reliable, fast, and optimised for CI, using metrics and data insights to continuously assess, improve, and scale testing infrastructure.
• Shift-Left & Security Testing
  • Drive a shift-left approach to quality by working with engineers to introduce testing earlier in the development lifecycle.
  • Partner with developers to improve unit and component-level test coverage where appropriate.
  • Introduce and evolve security testing practices, such as dependency scanning, basic penetration testing, and security-focused test scenarios.
  • Help teams think proactively about failure modes, edge cases, and abuse scenarios.
• CI/CD & Release Automation
  • Work closely with our DevOps engineer to design and implement a fully automated release pipeline.
  • Ensure test suites are well-integrated into CI/CD pipelines, providing fast and trustworthy feedback.
  • Define quality gates and release criteria that balance speed with confidence.
  • Improve observability and diagnostics for test failures in automated environments.
• Microservices & Cloud Environments
  • Test distributed, microservice-based systems running in AWS.
  • Validate service-to-service interactions, asynchronous workflows, and event-driven behaviour.
  • Ensure testing approaches scale as the platform evolves toward a more globally distributed architecture.

Your Experience

Essential

• 5+ years’ experience in test engineering or quality-focused engineering roles.
• Strong engineering background, with hands-on experience writing production-quality test code.
• Experience testing Java Spring applications and microservice-based architectures.
• Hands-on experience with end-to-end testing frameworks, ideally Playwright.
• Experience testing APIs, integrations, and distributed systems.
• Familiarity with AWS-based environments and cloud-native architectures.
• Experience working with CI/CD pipelines and automated test execution.

Highly Valued

• Experience designing and building automated test frameworks from scratch or significantly evolving existing ones.
• Experience implementing or influencing shift-left testing practices.
• Exposure to security testing concepts and tools.
• Experience collaborating closely with DevOps or platform engineering teams.
• Ability to operate autonomously and set testing direction in ambiguous environments.

Nice to Have

• Experience with performance or load testing.
• Knowledge of Infrastructure as Code (Terraform or CloudFormation).
• Experience working in a high-growth startup or scale-up environment.

Benefits

• Generous Annual Leave Allowance
• Competitive salary and commission/bonus package
• Learning and Development opportunities
• Private Health Insurance
• Cycle to work scheme
• Home & Tech scheme
• Regular company events and social initiatives

The HALOS Hiring Process

Here’s what we expect the hiring process for this role to be, should all go well with your candidacy. This entire process is expected to take 1-3 weeks to complete and you’d be expected to start on a specific date.

• Application
• 30 minute introductory meeting with the recruiting team
• 45 minute Interview with department hiring manager
• 30 minute meeting with wider department
• Offer!

Diversity & Inclusion

We’re an Equal Opportunity Employer and embrace a diversity of backgrounds, cultures, and perspectives. We do not discriminate on the basis of race, colour, gender, sexual orientation, gender identity or expression, religion, disability, national origin, protected veteran status, age, or any other status protected by applicable national, federal, state, or local law.