Senior Platform Engineer

Powering the world’s payments ecosystem

ACI powers the payments ecosystem - globally, and you power ACI. You’ll innovate, collaborate, and grow - in an energetic technology culture with decades of proven success. ACIers - in all roles and levels - are truly your colleagues and many are your friends. Our size and reach allow you to see the global impact of your work. You are visible, your talents are valued, and you are empowered to shape the future of payments.

As a Senior Platform Engineer in Limerick, you will join a diverse, passionate team, dedicated to powering the world’s payments ecosystem!

This purpose of this Senior Platform Engineer is:

ACI's Internal Developer Platform is the foundation every product and delivery team builds on - cloud-native infrastructure spanning Kubernetes/OpenShift and multiple cloud providers, CI/CD, observability, and the golden paths that let engineers ship payment software quickly and safely. As Sr Platform Engineer, you'll own a platform domain end-to-end - architecture, reliability, and roadmap - and be the technical authority other engineers turn to within that domain.

A typical day at ACI for a Senior Platform Engineer is:

• Own a platform domain end to end (e.g., CI/CD, observability, or cloud infrastructure) - architecture, reliability, and roadmap for that domain
• Architect resilient, multi-tenant platform services within your domain, balancing portability against deep cloud-provider leverage
• Lead the design and implementation of golden-path tooling in your domain, and measure its real impact on developer productivity, not just its existence
• Set reliability targets and error budgets for the services in your domain, and lead incident response and blameless postmortems when things break
• Architect AI-ready infrastructure within your domain - GPU/inference capacity, model-serving, or vector infrastructure - as a first-class capability
• Champion AI-assisted engineering practices within your domain, building AI-assisted tooling into the golden paths you own
• Design and enforce security and compliance controls (policy-as-code, tenant isolation) within your domain for a regulated payments environment
• Mentor platform engineers and associates, and lead design reviews for your domain
• Represent your domain's technical perspective to other platform teams and stakeholders, and resolve conflicts through technical reasoning
• Drive systematic reduction of toil and defects in your domain through automation
• Perform other duties as assigned

• Understand and adhere to all corporate policies to include but not limited to the ACI Code of Business Conduct and Ethics.

As a Senior Platform Engineer at ACI, you will work with the below Tech Stack:

• Gen AI infrastructure - hands-on experience with model-serving infrastructure and vector databases within your domain
• Container orchestration - strong, hands-on expertise with Kubernetes/OpenShift, including autoscaling and operator patterns
• Infrastructure as code - strong Terraform (or equivalent) expertise, including module design and policy-as-code enforcement
• Cloud platforms - strong expertise in [primary provider]; growing fluency across [secondary providers]
• CI/CD & delivery - hands-on ownership of pipeline architecture and golden-path tooling design within your domain
• Observability - strong instrumentation and observability design within your domain
• Service mesh & networking - solid experience with service mesh and platform-level network/security architecture

• Gen AI infrastructure - hands-on experience with model-serving infrastructure and vector databases within your domain

Knowledge, Skills and Experience needed to succeed in this role:

• Bachelor’s Degree in Computer Systems, Software Engineering or a similar subject.
• 8+ years experience in software engineering, DevOps, cloud engineering, or platform engineering roles, including experience owning a platform domain or major technical capability independently
• Strong critical thinking, with the ability to frame decisions clearly and evaluate technical trade-offs under pressure or ambiguity
• Strong systems thinking, with the ability to understand how a platform domain interacts with the wider platform and product ecosystem
• Solid, applied knowledge of SaaS, cloud-native architecture, Linux, networking, and distributed systems fundamentals
• Hands-on experience designing and operating resilient, multi-tenant, cloud-native platform services
• Strong hands-on experience with Kubernetes or OpenShift, including production operations, scaling, and workload management
• Strong experience with Infrastructure as Code, such as Terraform or equivalent, including reusable module design and automation
• Strong experience with modern CI/CD practices, pipeline architecture, and developer enablement or golden-path tooling
• Experience designing observability capabilities using logs, metrics, dashboards, alerting, and service-health indicators
• Experience implementing security, governance, or compliance controls within an enterprise or regulated environment
• Demonstrated ability to lead technical design reviews, mentor engineers, and provide technical direction without relying on formal authority
• Strong written and verbal communication skills, with the ability to explain technical decisions to engineers and stakeholders
• Experience leading incident response, problem investigation, or post-incident reviews for production platform services

Preferred Knowledge, Skills and Experience needed for this role:

• Experience owning the architecture, reliability, and technical roadmap for a platform domain such as CI/CD, observability, cloud infrastructure, or container platforms
• Experience designing internal developer platforms, self-service capabilities, or reusable golden paths that improve developer productivity
• Advanced experience with Kubernetes or OpenShift features such as autoscaling, operators, admission controls, or multi-tenancy patterns
• Experience with policy-as-code, tenant isolation, DevSecOps tooling, or automated governance controls
• Experience with service mesh technologies and platform-level network or security architecture
• Experience with multiple cloud providers or designing portable cloud-platform capabilities
• Experience with FinOps practices, cloud-cost optimization, or automated consumption governance
• Hands-on experience with AI-assisted engineering tools or AI-ready infrastructure such as model serving, GPU or inference capacity, or vector databases
• Experience operating platforms in payments, financial services, or another regulated industry

• Experience mentoring engineers and supporting their development into platform engineering careers

Core Capabilities:

We seek colleagues who embody our core capabilities - these shape our culture and enable us to make a meaningful impact together:

• Ensure Accountability: holding self and others accountable to meet commitments.

• Drives Results: consistently achieving results, even under tough circumstances.

• Customer Focus: building strong customer relationships and delivering customer-centric solutions.

• Cultivate Innovation: creating new and better ways for the organization to be successful.

• Collaborates: building partnerships and working collaboratively with others.

• Courage: stepping up to address difficult issues, saying what needs to be said.

Applicants must be currently authorized to work in Ireland on a full-time basis. This position does not offer sponsorship for employment visa status or work permit now or in the future.

In return for your expertise, we offer opportunities for growth, career development, and a competitive compensation and benefits package-all within an innovative and collaborative work environment.

Are you ready to help us transform the payments ecosystem? To learn more about ACI Worldwide, visit our web site at www.aciworldwide.com Job ID (Requisition #19966)

ACI Worldwide is an AA/EEO employer in the United States, which includes providing equal opportunity for protected veterans and individuals with disabilities, and an EEO employer globally.

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Job seekers should be aware of ongoing recruitment scams where individuals or organizations impersonate legitimate companies to offer fake job opportunities. These scams often involve requests for personal information, payments, or interviews through unofficial channels. Please be cautious and verify any communications claiming to be from our company (www.aciworldwide.com / @aciworldwide.com). The ACI Worldwide recruitment team will always follow official channels and will never request payment.