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# Senior Site Reliability Engineer - Connex

- **Company:** MasterCard
- **Location:** Harrogate, UK
- **Experience:** Expert
- **Salary:** £35,533.0
- **Contract:** Permanent contract
- **Skills:** Agile Methodology, COBOL (Programming Language), Cyber Security, Computer Programming, Disaster Recovery, File Transfer, Scrum Methodology, Systems Development Life Cycle, Release Management, Reliability Engineering, Software Engineering, SQL Databases, Transaction Processing (Computing), Web Technologies, ISO 8583, Software Version Control
- **Published:** July 3, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5785799709

## About the Role

Experience with Connex and related technologies in a live production environment is highly desirable, including:

 * 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 such as ISO8583, VISA, Mastercard, LIS5
 * HSMs, cryptology and TLS
 * Source code management and controlled deployments
 * Full SDLC lifecycle experience (design, development, testing, implementation, support), * Strong communication, organisation, and time management skills
 * Proven ability to troubleshoot complex systems under pressure
 * Experience in financial services or payments environments
 * Understanding of ITIL practices, change, and release management
 * Familiarity with Agile methodologies and team-based delivery
 * Experience with functional and non-functional deployments
 * Knowledge of programming or web technologies is an advantage
 * Strong analytical mindset with a focus on continuous improvement and tooling, * Passion for production support, diagnostics, and reliability engineering
 * Proactive, self-driven, and committed to continuous learning
 * Collaborative team player with a flexible, adaptable mindset
 * Motivated to improve processes and embrace emerging technologies
 * Strong ownership mindset with a desire to make a meaningful impact

## Description

* Provide second-line support for mission-critical applications, ensuring adherence to service priorities and operational standards
 * Support live production environments, including participation in a 24/7 on-call rota
 * Deliver hotfixes, tooling improvements, and system housekeeping
 * Work within a cross-functional Scrum team, contributing to application design, delivery, and technical consultancy
 * Manage and implement changes, releases, and fixes in line with governance processes
 * Support and maintain Disaster Recovery (DR) capabilities, including testing, risk management, and alignment with corporate strategy
 * Collaborate with third-party suppliers for issue resolution and escalation to third-line support
 * Ensure traceability from business requirements through to acceptance criteria
 * Work closely with Service Management to resolve incidents, define enhancements, and improve system performance
 * Maintain accurate and up-to-date technical documentation and artefacts, * Drive innovation in production support, identifying opportunities to improve efficiency through automation and tooling
 * Contribute to the production support strategy and roadmap, including technology selection
 * Collaborate with stakeholders to design and implement effective solutions
 * Participate in iterative, agile deployments as part of a Scrum team using Safe Agile
 * Investigate production issues and perform root cause analysis, All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:
 * Abide by Mastercard's security policies and practices;
 * Ensure the confidentiality and integrity of the information being accessed;
 * Report any suspected information security violation or breach, and
 * Complete all periodic mandatory security trainings in accordance with Mastercard's guidelines.


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