Principal Systems Engineer jobs in Newtownabbey

You will work closely with Senior, Staff and Principal Engineers across Belfast and the wider global engineering organisation, contributing to large scale distributed systems while acting as a technical authority within the team. This role offers a strong mix of hands-on development, architectural decision making and mentorship.

You will be responsible for advanced troubleshooting, resolving complex L3 technical issues, and developing automation scripts (e.g., Python, PowerShell) to streamline operational workflows. A critical element is active monitoring using industry-standard tools to anticipate and mitigate potential failures, maintaining strict adherence to service level agreements (SLAs).

You will be instrumental in bridging the gap between research and production, ensuring models are robust and performant in enterprise environments. Essential requirements include expert proficiency in Python, experience with major deep learning frameworks like TensorFlow or PyTorch, and familiarity with cloud infrastructure for large-scale data processing.

You will be a vital part of this evolution, contributing your expertise to our strategy and helping us redefine what services we offer our clients.

You will ensure buildings are designed to minimise fire risks, through contributing to the development of fire strategy reports, calculations and fire risk assessments.

You should also expect to work across the full stack and every stage of the product lifecycle, from system design through to build, test, deployment and supporting systems in production, so you should be skilled in practices like TDD, CI/CD, IaC and Observability.

Principal Software Engineer Fully Remote | Permanent | Competitive Salary + Benefits Harrington Starr has partnered with a leading Global Payments Technology company who are seeking to hire a Principal Software Engineer to join their senior engineering leadership team. This is a rare opportunity to combine hands-on development with strategic influence, guiding architecture decisions and shaping...

You will define technical strategy, design scalable data systems, mentor senior engineers, and partner closely with product, engineering, analytics, and business leaders to transform strategic goals into robust, data-driven solutions.

You will have responsibility for design and management of mechanical building services projects in complex buildings, including refurbishing existing buildings. In some cases, you will be part of a larger team on major projects, as well as managing your own projects.

You will work closely with Senior, Staff and Principal Engineers across Belfast and the wider global engineering organisation, contributing to large scale distributed systems while acting as a technical authority within the team. This role offers a strong mix of hands-on development, architectural decision making and mentorship.

You will work closely with Senior, Staff and Principal Engineers across Belfast and the wider global engineering organisation, contributing to large scale distributed systems while acting as a technical authority within the team. This role offers a strong mix of hands-on development, architectural decision making and mentorship.

You will play a key role in defining and executing QA strategy, building robust automated testing frameworks, and ensuring high-quality delivery across back-end services, APIs and data pipelines.

Principal Software Engineer - (Fully Remote) The Opportunity Ocho is partnering with a fast-growing, product-led client to hire a Principal Software Engineer to help shape and deliver the next generation of their platform. This is a hands-on role focused on designing, building, and scaling modern backend systems in a fully remote environment. Key Responsibilities Own and deliver high-quality,...

You will influence architecture and delivery end-to-end, working closely with architects, senior engineers and business stakeholders across regions. The role combines hands-on technical leadership with ownership of delivery, mentoring engineers and championing modern engineering practices across distributed, cloud-native systems.

You will play a key role in shaping platform architecture, improving engineering standards, and supporting teams delivering critical systems across multiple regions.

You will work closely with product, design, and engineering leadership to deliver scalable features, drive engineering best practice, and support the development of junior engineers.

You will design and build scalable backend services, APIs, and integrations, while working closely with Product and UX to scope features, refine requirements, and contribute to roadmap direction.

Principal Front-End Engineer (React) Experience level: 10+ years Have you spent years building front-end systems that scale - and now want a role where your decisions genuinely shape how products and teams operate? My client is looking for a Principal React Engineer to take ownership of front-end architecture, set engineering standards, and act as a technical authority across multiple product...

You will set technical direction, influence architecture, and lead engineering standards across complex Rates and FX platforms. This role suits someone who wants real impact, scale, and accountability, not just delivery. Working in an Agile environment, you will partner closely with architects, engineers, and stakeholders across regions to drive resilient, high-quality systems.

Principal QA Engineer - Python Automation - Hybrid (Belfast) Role Overview As Principal QA Engineer, you will be the technical authority for automation strategy within a complex, distributed, low latency environment. You'll take ownership of evolving Liquidnet's automated testing ecosystem, shaping best practice, and introducing high impact Python driven automation across the SDLC. This role sits...

Principal & Staff Software Engineers At a glance Principal or Staff Software Engineer role on a mission-critical payments platform Lead engineers and influence architecture, design, and delivery Remote-first with a Belfast city centre office Strong salary, excellent benefits, and genuine technical ownership About the Company Our client is a global payment technology business operating at...

You will work on large scale platforms used daily across physical and digital environments, partnering closely with product, backend, and design leaders to shape long term frontend strategy.

You will remain hands on while providing architectural leadership, mentoring senior engineers, and ensuring high quality, scalable UI solutions are delivered consistently.