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From the employer's careers site First seen 1 Nov 2026

Senior Software Engineer - Connex

Mastercard senior full-time

The employer hasn't listed a salary.

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Description

We are seeking a talented Senior Connex Software Development Engineer to join our dynamic, cross-functional team, working within the SAFe methodology. This is an exciting opportunity to contribute to the advancement of payment technologies.

Key Responsibilities:

  • Participate in team prioritisation discussions with Product and Business stakeholders.
  • Estimate and take ownership of delivery tasks,including design, development, testing, deployment, configuration, and documentation,to meet business requirements.
  • Automate the build, operation, and running aspects of software development and testing.
  • Drive code, design, and process trade-off discussions within the team as needed.
  • Report on status and manage risks within the primary application or service.
  • Drive integration of services with a focus on the customer journey and experience.
  • Perform demonstrations and acceptance discussions when interacting with Product Owners.
  • Understand operational and engineering experiences and actively work to improve experience and metrics within the area of ownership.
  • Develop a complete understanding of end-to-end technical architecture and dependency systems.
  • Drive the adoption of technology standards and opinionated frameworks, as well as review coding, testing, and automation work of team members.
  • Mentor and guide new and less experienced team members.
  • Identify opportunities to improve overall processes and eliminate waste.
  • Share and seek knowledge within the Guild or Programme to drive reuse of patterns, libraries, and practices, thereby enhancing productivity.
  • Contribute to the test strategy across projects, including BDD-style functional, system integration, and non-functional testing such as volume, performance, resilience, and availability.
  • Design innovative test scenarios to uncover potential issues that may not be immediately evident to others.
  • Lead online real time transaction switching and ATM acquiring testing activities across multiple platforms.
  • Set up, maintain, and execute test automation frameworks across various application platforms.
  • Identify opportunities for test automation, prioritising automation efforts based on risk assessment throughout the delivery lifecycle.
  • Ensure traceability from business requirements to acceptance criteria is established and demonstrable from the inception of the project.
  • Drive innovation in automation across all application tiers, including UI, APIs, CLIs, Connex, HP NonStop, and database layers.
  • Investigate and resolve technical issues reported by the customer support team.
  • Bring experience in building comprehensive test scenarios and acceptance tests, collaborating within an iterative deployment environment.

Ideal Candidate Profile:

  • Highly experienced in Connex on HP NonStop development background.
  • Understanding of financial industry hardware such as ATM’s, HSM’s HP Nonstop and related standards and security requirements including PCI and OWASP.
  • Excellent understanding of online transaction processing, including knowledge of ATM transaction processing.
  • Experience of TCP/IP and communication protocols.
  • Strong knowledge of TAL, COBOL, SCOBOL and TACL.
  • Understanding of EMV and chip and PIN technology.
  • Knowledge of HP Non-Stop protocols, security and utilities.
  • Strong understanding of financial industry protocols including ISO8583, ISO20022, LIS5, VISA, MasterCard or ATM message protocols.
  • Knowledge of some of GoldenGate, Electronic File Transfers, Java, UNIX, Spring, Hibernate, XML.
  • Proven development experiences a solid background as a developer across various platforms.
  • Proven technical testing experience within Agile environments, particularly with BDD methodologies.
  • Hands-on automation testing expertise using open-source technologies such as Selenium, Cucumber, Gherkin, Spring, etc.
  • Be comfortable with regular demonstrations to stakeholders and comfortable with pair programming.
  • Exceptional communication skills, with the ability to collaborate effectively within a multidisciplinary team.
  • Excellent time management and organisational abilities.
  • Strong problem-solving skills and a proactive attitude.
  • Genuine passion for testing, development, and technology design across diverse full stack platforms.
  • Demonstrated experience in both functional and non-functional automated testing.

Skills

Required

  • Connex
  • HP NonStop
  • TAL
  • COBOL
  • SCOBOL
  • TACL
  • EMV
  • chip and PIN technology
  • TCP/IP
  • communication protocols
  • ISO8583
  • ISO20022
  • LIS5
  • VISA
  • MasterCard
  • ATM message protocols
  • GoldenGate
  • Electronic File Transfers
  • Java
  • UNIX
  • Spring
  • Hibernate
  • XML
  • Selenium
  • Cucumber
  • Gherkin
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