Sign up to access all features of our service.
  • Job search
  • Favorites
  • Create a CV
    New
  • Salaries
  • Subscriptions

Senior Site Reliability Engineer - Connex

Full-time

Mastercard

Our Purpose Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential. Title and Summary

Senior Site Reliability Engineer - Connex

About Mastercard
Mastercard is a global technology company in the payments industry, dedicated to enabling an inclusive digital economy that benefits everyone, everywhere. By making transactions safe, simple, smart, and accessible, we empower individuals, financial institutions, governments, and businesses to reach their full potential.
Our culture is driven by our Decency Quotient (DQ), which shapes how we work both internally and externally. Operating across more than 210 countries and territories, we are committed to building a sustainable world that unlocks priceless possibilities for all.
About Vocalink (a Mastercard Company)
Vocalink powers the UK’s critical payment infrastructure, including real-time payments, settlement systems, direct debits, and a nationwide ATM network of nearly 60,000 machines. Our systems process:
• Over 90% of UK salaries
• More than 70% of household bills
• Almost all state benefit payments
Joining Vocalink means contributing to systems that millions rely on daily.

The Opportunity
We are seeking a Site Reliability Engineer II to support mission-critical applications within the UK’s national payment infrastructure (FPS and CTS). This role is ideal for someone who thrives in a collaborative, agile environment and is passionate about reliability, continuous improvement, and modern technology.

Key Responsibilities
• 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

Connex Domain Experience
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)

Additional Responsibilities
• 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

Skills & Experience
• 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

Personal Attributes
• 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 Corporate Security Responsibility

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.
Vacancy posted 20 days ago
Similar jobs that could be interesting for youBased on the Senior Site Reliability Engineer - Connex in United Kingdom vacancy
  •  ...products and services that help people, businesses and governments realize their greatest potential. Title and Summary Senior Software Engineer - Connex Senior Software Development Engineer Join a Leading Technology Company in Global Payments Mastercard, a... 
    Senior
    Full time
    Immediate start
    Worldwide

    Mastercard

    United Kingdom
    9 days ago
  •  ...place for you? Join us! Role Overview The Sr. Manager, Site Reliability Engineering (London) is an experienced leader responsible for overseeing...  ...Incident Response & Escalation Management: Serve as the senior escalation point for production incidents across European... 
    Senior
    Full time
    Work at office
    Local area
    Weekend work

    Cboe Digital

    United Kingdom
    a month ago
  •  ...consumer discussion boards on the modern internet. Position Overview We are seeking a highly technical, high-agency Staff Site Reliability Engineer to lead reliability engineering initiatives for our critical user-facing systems at absolute internet scale. Sitting at... 
    Suggested
    Full time
    Remote work
    Flexible hours

    Reddit

    United Kingdom
    15 days ago
  • $100k - $130k

     ...staking, and OTC services, with products built for both individual investors and institutional clients. Join our engineering team as a Senior Site Reliability Engineer focused on the edge and ingress layer that fronts our platform — the systems that stand between the... 
    Suggested
    Remote job
    Full time
    Work at office
    Local area

    Kraken

    United Kingdom
    6 days ago
  •  ...layers underpinning agentic workflows are reliable, observable, and built to scale. This...  ...AI — a space that moves fast and demands engineers who can bring production discipline to emerging...  ...You Bring ~5+ years of experience as a Site Reliability Engineer, Infrastructure... 
    Suggested
    Remote job
    Full time
    Local area

    Kraken

    United Kingdom
    a month ago
  • $15 per hour

     ...Summary The Wikimedia Foundation is seeking a Senior Software Engineer to join the team supporting the Wikidata Platform — the structured...  ...scale, production-grade services while ensuring performance, reliability, and maintainability. Working closely with the technical... 
    Senior
    Full time
    Remote work

    Wikimedia Foundation

    United Kingdom
    7 days ago
  •  ...fintechs, banks, brokerages, and payment providers. As a Senior Software Engineer in Payward Services you'll build and scale the systems...  ...trading, payments, and crypto experiences with a focus on reliability, performance, and user impact. Write reusable, testable... 
    Senior
    Remote job
    Full time
    Local area

    Kraken

    United Kingdom
    9 days ago
  •  ...Join Checkly as a Senior Customer Solutions Engineer and empower developers and agents to own and ensure application performance and reliability - from pull request to post-mortem! Checkly is...  ...leave & up to 14 weeks of paid parental leave ~ Annual company on-site... 
    Senior
    Full time
    Remote work
    Flexible hours

    Checkly

    United Kingdom
    7 days ago
  • The exchange team develops and maintain a cutting-edge trading platform. With a global presence across APAC, EMEA and North America, the team has since grown with the goal to provide a seamless and secure trading experience for our clients. Responsibilities Responsible...
    Senior
    Full time
    Remote work
    Free visa

    Crypto Com

    United Kingdom
    a month ago
  • €100k - €130k per year

     ...stored in a strategic [Chainlink Reserve]( Learn more at [chain.link]( About the role The Senior Software Engineer will play a critical role in advancing the reliability, scalability, and operational excellence of the Chainlink Runtime Environment (CRE) platform. Working... 
    Senior
    Remote job
    Full time

    Chainlink Labs

    United Kingdom
    21 days ago
  •  ...The Role As a Senior Software Engineer in the Acquisition Squad, you will be the driving force behind the key application and web development...  ...the squad to ensure high-quality, maintainable, modular, and reliable code is shipped across our acquisition stack. Heavily... 
    Senior
    Full time

    Butternut Box

    United Kingdom
    3 days ago
  • £80k per year

     ...America, the team has since grown with the goal to provide a seamless and secure trading experience for our clients. As a Senior Devops Engineer, you will be involved a number of technically challenging problems, oversees design and coding for features. This position... 
    Senior
    Full time
    Remote work
    Free visa

    Crypto Com

    United Kingdom
    a month ago
  •  ...identity and access management. This role sits in our Platform Engineering team, which delivers features and design work that spans the...  ...to secure and govern AI agents. We are looking for a Senior Software Engineer who can turn ideas into production capabilities... 
    Senior
    Full time
    Local area
    Worldwide
    Flexible hours

    Pingidentity

    United Kingdom
    3 days ago
  •  ...ensuring the team collaborate and effectively build scalable, reliable, and secure backend systems that support our mission to create...  ...Requirements Essential: ~5+ years experience in software engineering ~ Professional understanding of agile concepts and processes... 
    Senior
    Full time
    Remote work
    Work from home
    Worldwide
    Flexible hours

    Lockwood Publishing

    United Kingdom
    7 days ago
  •  ...functionality. Responsibilities Be independently responsible for the entire lifecycle of projects or features including engineering design, development, deployment, testing and maintenance. Develop production ready software to run on our vehicles and in the... 
    Senior
    Full time
    Contract work
    Local area

    Rivian

    United Kingdom
    a month ago
  •  ...everything to do with the trading backend services such as the matching engine, market data gateways, internal and external APIs, margin...  ...trading infrastructure — built on Aeron for ultra-low-latency, reliable UDP messaging. You'll work directly on the systems that move... 
    Senior
    Remote job
    Full time
    Local area

    Kraken

    United Kingdom
    a month ago
  •  ...seeking a highly autonomous, systems-fluent, and audio-proficient Senior AI Engineer | Voice to take comprehensive technical ownership of our...  ...squads to translate intricate audio-model concepts into reliable product features. Hands-on Software Craftsmanship: Serve... 
    Senior
    Permanent employment
    Full time
    Work at office
    Local area
    Remote work
    Shift work

    JUPUS

    United Kingdom
    16 days ago
  •  ...Job Description: The Leonardo Cyber Security Division is looking to recruit Senior DevSECOps Engineers to provide a bridge between software development, testing, infrastructure, operations and system administrators to facilitate efficient, continuous and high-quality... 
    Senior
    Permanent employment
    Contract work
    Part time
    Flexible hours

    Leonardo Worldwide Corporation

    United Kingdom
    more than 2 months ago
  •  ...legal case files. By combining practical engineering with advanced language models, JUPUS...  ...systems-fluent, and development-oriented Senior Applied AI Engineer to expand our core AI...  ...Engineering, CTO, and Product teams to ship reliable, user-facing features that extract... 
    Senior
    Shorter hours
    Permanent employment
    Full time
    Contract work
    Local area
    Immediate start
    Remote work
    Shift work

    JUPUS

    United Kingdom
    16 days ago
  •  ...via Claude, return accurate, contextually aware results. You are the steward of how well our BI tool thinks. Partner with data engineering to optimise performance, and build what's missing Own and maintain the semantic data layer and transformation logic so that... 
    Senior
    Full time

    Primer

    United Kingdom
    10 hours ago
  •  ...We are looking for a Senior Developer Advocate (Education focus) to: Teach a community of automation, no-code and open source builders, meeting them where they already are with practical how-tos, helping them get unstuck, and building relationships with our most active... 
    Senior
    Full time

    N8n

    United Kingdom
    10 hours ago
  •  ...scalability, advanced automation, and cloud engineering excellence. Position Overview We...  ...-fluent, and development-oriented Senior Cloud Operations Engineer to join our global...  ...eliminate operational toil by applying site reliability engineering (SRE) principles directly... 
    Senior
    Permanent employment
    Full time
    Work at office
    Remote work
    Worldwide
    Flexible hours
    Shift work
    Night shift

    Nice

    United Kingdom
    15 days ago
  •  ...As a Senior Backend Engineer in GitLab’s Platform Enablement organization, you will help make GitLab easier to deploy, validate, and operate across environments. You’ll help shape GitLab’s next generation of self-managed deployment guidance as Reference Architectures... 
    Senior
    Full time

    GitLab

    United Kingdom
    2 days ago
  •  ...Job Description: Job Description Are you a Real Time Embedded Software Engineer ready to take the next step on your career journey. If you are looking at opportunities for progression, to learn and grow within a supportive environment, Leonardo has multiple roles... 
    Contract work
    Flexible hours

    Leonardo Worldwide Corporation

    United Kingdom
    more than 2 months ago
  •  ...something profound and transformative. Your Mission As a Senior Full Stack Engineer at Improbable, you will work with Ventures to help them...  ...steady-state mode to harden what's worth keeping—tests, edge cases, reliability. [Improbable Candidate Privacy Policy](... 
    Senior
    Full time
    Shift work

    Improbable

    United Kingdom
    a month ago
  •  ...and institutional clients. The Agent Systems team is a 0→1 engineering group building internal AI-powered agents that interact...  ...moving — prototypes are expected, but the bar for production reliability remains high. Engineers on this team move fluidly between experimentation... 
    Senior
    Remote job
    Full time
    Local area

    Kraken

    United Kingdom
    29 days ago
  •  ...you: ~ Location: US or UK ~3+ years in developer relations, developer community at a developer tools company or 2+ years in AI Engineering role. ~ You build things. You can write code, ship demos, and speak credibly with developers about what they're actually... 
    Senior
    Full time
    Flexible hours

    Sanity

    United Kingdom
    13 days ago
  •  ...About This Role We are looking for a Senior Shopify Full Stack Developer with deep expertise in the Shopify ecosystem, a strong grasp...  ...and async collaboration. Comfortable mentoring other engineers and leading by example. Passionate about eCommerce innovation... 
    Senior
    Full time

    Remote Talent LATAM

    United Kingdom
    2 days ago
  •  ...data governance and validation workflows that maximize model reliability for top AI organizations at scale. Operating as an impact-...  ...We are seeking a highly analytical, systems-minded Senior Backend Engineer (Go) to join an elite group of core technologists building... 
    Senior
    Hourly pay
    Daily paid
    Full time
    Contract work
    For contractors
    Freelance
    Remote work
    Work from home

    CloudFactory

    United Kingdom
    15 days ago
  •  ...and Computer Associates (CA) Working closely with the other Engineering teams to ensure the systems that are built are stable, available...  ...conferences. Work setup Hybrid working: remote + on client site (Sheffield) Benefits Our people are the most critical... 
    Work at office
    Remote work
    Flexible hours

    NTT DATA, Inc.

    United Kingdom
    5 days ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Senior Site Reliability Engineer - Connex. Be the first to apply!