Mastercard
Senior Site Reliability Engineer - Connex
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Senior Site Reliability Engineer - Connex
Our Purpose
Mastercard powers economies and empowers people globally across 200+ countries and territories. Together with our customers, we help build a sustainable economy where everyone can thrive. We support a wide range of digital payments, ensuring transactions are secure, simple, smart, and accessible. Our technology, innovation, partnerships, and networks deliver unique products and services to help individuals, businesses, and governments achieve their full potential.
Title And Summary
Senior Site Reliability Engineer – Connex
About Mastercard
Mastercard is a global technology company in the payments industry, dedicated to fostering an inclusive digital economy that benefits everyone, everywhere. Through safe, simple, smart, and accessible transactions, we enable individuals, financial institutions, governments, and businesses to reach their fullest potential.
Our culture is centred around our Decency Quotient (DQ), shaping how we operate both internally and externally. Operating across over 210 countries and territories, we are committed to building a sustainable future that unlocks opportunities for all.
About Vocalink (a Mastercard Company)
Vocalink sits at the heart of the UK’s critical payment infrastructure, delivering:
- Real-time payments
- Settlement systems
- Direct debits
- A nationwide ATM network of almost 60,000 machines
Our systems enable: ✔ Over 90% of UK salaries ✔ More than 70% of household bills ✔ Almost all state benefit payments
Every day, our systems power payments relied upon by millions of people.
The Opportunity
We are looking for a Senior Site Reliability Engineer II to support mission-critical applications in the UK’s national payment infrastructure (FPS and CTS). This role is perfect for an individual thriving in a collaborative, agile environment, with a passion for reliability, continuous improvement, and modern technology.
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Key Responsibilities
- Provide second-line support for mission-critical applications, upholding service priorities and operational standards
- Support live production environments, including a 24/7 on-call duty rotation
- Deliver hotfixes, tooling improvements, and system housekeeping
- Collaborate in a cross-functional Scrum team, contributing to application design, delivery, and technical consultancy
- Manage and implement changes, releases, and fixes while adhering to governance processes
- Support and maintain Disaster Recovery (DR) capabilities, including testing, risk management, and alignment with corporate strategy
- Work with third-party suppliers to resolve issues and escalate to third-line support when required
- Ensure traceability from business requirements to acceptance criteria
- Partner with Service Management to resolve incidents, define enhancements, and optimise system performance
- Maintain accurate, up-to-date technical documentation and artefacts
Connex Domain Experience (Preference Desired)
Candidates possess experience in the following production environments:
- HP NonStop systems
- Pathway, GoldenGate, and electronic file transfer tools
- TACL, TAL, COBOL, SQL (Enscribe), Enform
- TACL scripting
- ATM switching, transaction processing, and financial networks
- Card authentication, authorization, and EMV standards
- Protocols and standards (ISO8583, VISA, Mastercard, LIS5)
- HSMs, cryptology, and TLS
- Source code management and controlled deployments
- Full SDLC lifecycle experience (design, development, testing, implementation, support)
Additional Responsibilities
- Drive innovation in production support, spotting opportunities for automation and tooling improvements
- Contribute to production support strategy and roadmaps, including technology selection
- Collaborate with stakeholders to design and implement solutions
- Act in Agile deployments as part of a Scrum team using Safe Agile
- Independently investigate production issues and conduct root cause analysis
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Skills & Experience
- Strong communication, organisational, and time management skills
- Proven ability to troubleshoot complex systems under pressure
- Experience in financial services or payments
- Familiarity with ITIL practices, change management, and release planning
- Knowledge of Agile methodologies and team-based delivery
- Extensive experience with functional and non-functional deployments
- A programming or web technologies background is beneficial
- Analytical, innovative mindset with an emphasis on continuous improvement and tooling development
Personal Attributes
- Passionate about production support, diagnostics, and reliability engineering
- Proactive, self-motivated, and committed to continuous learning
- Collaborative team player with a flexible, adaptable approach
- Driven to improve systems and embrace new technologies
- Strong ownership mindset with a desire to make a meaningful impact
Corporate Security Responsibility
All interactions involving Mastercard assets, information, or networks require diligence due to inherent security risks. Every individual is responsible for:
✅ Adhering to Mastercard’s security policies and practices ✅ Safeguarding confidentiality and data integrity ✅ Reporting any suspected security violations or breaches ✅ Completing mandatory annual security training as required
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