Lead SRE — Real-Time Payments on HP NonStop

Mastercard Inc.; Dublin; On-site; EUR 140,000 - 190,000; Full time

Job summary

Mastercard Inc. in Ireland is seeking a Lead Site Reliability Engineer with deep HP NonStop expertise to own the reliability of real-time payment platforms.

You will set reliability standards, mentor engineers, and partner with security, infra, and product teams to reduce operational risk and scale mission-critical systems. You will drive automated monitoring, incident response, and resilience engineering, ensuring PCI and security requirements while guiding platform modernization and rollout

Qualifications

• Strong, hands-on experience with HP NonStop (Tandem) platforms.
• Deep knowledge of NonStop OS, Pathway, TMF, EMS, OSS, TACL, and diagnostic tooling.
• Experience supporting high-throughput, low-latency, real-time transaction systems.
• Proven ownership of production reliability in 24x7 environments.
• Solid experience in payments networks or financial transaction processing.
• Understanding of transaction switching, routing, authorisation, and settlement flows.
• Familiarity with PCI-regulated, high-availability production systems.
• Strong incident management and problem-solving skills.
• Experience defining and operating against SLO-based reliability models.
• Ability to lead cross-functional teams under pressure.
• Excellent communication skills for executive, technical, and partner audiences.

Responsibilities

• Own availability, performance, latency, and resilience of payment platforms on HP NonStop (Tandem) infrastructure.
• Define and enforce SLOs, SLIs, and error budgets for mission-critical payment services.
• Proactively identify reliability risks and drive corrective and preventive actions.
• Act as a lead incident commander for high-severity production incidents.
• Drive rapid triage, mitigation, and resolution across application, platform, and infrastructure layers.
• Lead blameless post-incident reviews, ensuring strong root-cause analysis and measurable follow-ups.
• Reduce toil by driving automation across monitoring, diagnostics, deployment, and recovery workflows on HP NonStop platforms.
• Partner with engineering teams to improve operability, observability, and failure handling.
• Support modernisation initiatives while ensuring PCI, security, and compliance requirements are met.
• Lead release readiness and production validation for changes impacting payment switching platforms.
• Define rollback, failover, and recovery strategies to minimise customer impact.
• Own participation in DR testing, BCP exercises, and site‑resilience planning for Payment Networks.
• Ensure deep operational understanding of payments transaction flows, including real-time switching, routing, and settlement.
• Collaborate with product and engineering teams to embed reliability early in design.
• Provide technical leadership and mentoring to SREs and operations engineers.
• Set standards for runbooks, monitoring quality, alert hygiene, and operational excellence.
• Influence reliability strategy and priorities at a programme and domain level.

Skills

HP NonStop

NonStop OS

Pathway

TMF

EMS

OSS

TACL

Diagnostic tooling

Payments networks

Transaction switching

PCI compliance

Incident management

SLO/SLI

Cross-functional leadership

Executive communication

Job description

Mastercard Inc. in Ireland is seeking a Lead Site Reliability Engineer with deep HP NonStop expertise to own the reliability of real-time payment platforms.

You will set reliability standards, mentor engineers, and partner with security, infra, and product teams to reduce operational risk and scale mission-critical systems. You will drive automated monitoring, incident response, and resilience engineering, ensuring PCI and security requirements while guiding platform modernization and rollout