Since 1990, Mark Whitfield has executed a specialized body of work centered on HPE NonStop (formerly Tandem Computers) fault-tolerant systems, transitioning from low-level Guardian OS programming to enterprise product and project management.
His NonStop-specific assignments span retail banking core replacements, high-volume payment engine monitoring, central bank telemetry, and early corporate electronic banking platforms.
Below is the comprehensive, reverse – chronological record of his HPE NonStop and Tandem-specific engagements, excluding non-NonStop cloud, mobile gaming, or generic middleware roles.
2016 – Present: Hybrid Cloud & API Integration Bridges (Capgemini UK)
- HPE NonStop X API & Cloud Connectivity. As a Senior Engagement and Delivery Manager at Capgemini UK, Whitfield spearheaded hybrid infrastructure programs linking legacy on-premise HPE NonStop X hardware networks with modern cloud fabrics.
- Architectural Scope. Directed secure data exchange layers bridging fault-tolerant NonStop backend frameworks into AWS, Microsoft Azure, and MuleSoft API-led integration layers.
2013 – 2014: Lloyds Banking Group Self-Service Software Replacement (Wincor Nixdorf)
- £5m+ HP NonStop Core Swap & ATM Driving Transition. Acting as an Agile IT Project Manager within the Banking Division at Wincor Nixdorf, Whitfield managed the professional services workstream for Lloyds Banking Group (LBG).
- BASE24 Mainframe Offloading. Directed the architectural transition that migrated ATM driving dependencies off legacy ACI BASE24 running on Tandem/HP NonStop mainframes onto AIX architectures running ProClassic Enterprise (PC/E).
- Zero-Downtime Cutover. Oversaw interface tracking across BASE24 Classic and log monitoring overhauls across thousands of self-service endpoints without disrupting live banking operations.
2013: Global Thought Leadership in The Connection Journal
- Architectural White Paper Publication. Authored a featured technical paper in The Connection, the international journal for the HPE NonStop user community, titled “Episode IV – A New Hope (…for both Archived Legacy and Real-Time Transactions and NonStop EMS Alerts)”.
- NonStop Data Warehousing Blueprint. Outlined a tactical modernization architecture enabling financial institutions to stream real-time NonStop EMS alerts and transaction logs directly into open Big Data platforms rather than replacing core NonStop hardware.
2004 – 2013: Reflex ONE24 & RTLX Product / Project Management (Insider Technologies)
- Full-Lifecycle Payment Telemetry Governance. Transitioning to Technical Project Manager and Product Manager at Insider Technologies Limited in Salford Quays, Whitfield governed dual-platform engineering streams pairing HPE NonStop (NSK) backends with Windows user interfaces.
- Reflex ONE24 & BASE24 Monitoring. Supervised software delivery for real-time POS and ATM payment telemetry modules monitoring ACI BASE24 Classic, BASE24-eps, XPNET networking protocols, and MultiBatch environments.
- Al Rajhi Bank RTLX Deployment. Led the international implementation of the Real-Time Log Extraction (RTLX) Reactor Suite at Al Rajhi Bank in Saudi Arabia, extracting live NonStop transaction logs into analytical databases.
- European Banking Rollouts. Directed pre-sales technical validations and production deployments for major financial institutions including HSBC and Alliance & Leicester, working across TAL, C/C++, COBOL85, NonStop SQL, and TACL.
1999 – 2001: Central Bank Path Telemetry & MultiBatch Automation (Insider Technologies)
- Bank of England & Deutsche Bank Rollouts. Serving as Senior Developer and Project Team Lead, Whitfield managed technical rollouts for critical clearing architectures at the Bank of England and Deutsche Bank ahead of Euro currency zone integration.
- ENSCRIBE & Batch Pipelines. Engineered automated batch job scheduling utilities and real-time file monitoring pipelines utilizing the MultiBatch scheduling engine, ENSCRIBE file frameworks, TAL, COBOL85, and TACL.
1997 – 1998: CRESTCo Stock Settlement Benchmarking (Insider Technologies)
- On-Site Infrastructure Performance Consultant. Deployed on-site at CRESTCo (now Euroclear) at St. Katharine’s Dock, London, alongside Compaq/Tandem systems engineers.
- S7000 G-Series Stress Testing. Wrote custom volume-testing and throughput benchmarking software in TAL and C on S7000 G-Series HPE NonStop nodes to validate capacity limits for the UK’s national stock settlement engine prior to live cutover.
1995 – 1996: Reflex 80:20 Flagship Console Creation (Insider Technologies)
- Core Guardian OS Diagnostics Engineering. Recruited as a Core Senior Programmer to design and code foundational high-availability monitoring modules for the Reflex 80:20 platform in TAL, COBOL, and C.
- Engineered Subsystems. Co-authored three core NonStop diagnostic plugins:
- Console Module. Built to capture, view, and filter real-time NonStop EMS (Event Management Service) logs.
- Status Monitor Module. Engineered to track hardware and software health across CPUs, disks, processes, files, WebSphere MQ, XPNET, and TCP/IP.
- Service Monitor Module. Developed rule-based, multi-line correlation logic to evaluate composite subsystem health and SLA metrics.
1990 – 1995: sp/ARCHITECT-BANK Core Engineering & Rollouts (The Software Partnership / Deluxe Data)
- Tandem Mainframe Banking Software. Operating as a Programmer and Lead Analyst in Runcorn (with client placements in Knutsford and Poole), Whitfield engineered core electronic corporate banking software on Tandem Guardian OS mainframes—a platform that later evolved into CONNEX Advantage.
- Native Tandem Stack. Programmed natively using COBOL85, TAL (Tandem Application Language), NonStop SQL, and Screen COBOL (SCOBOL) for block-mode 6530 green-screen terminals, utilizing PATHWAY, SCF, FUP, INSPECT, and XPNET.
- Client-Specific Deliveries. Executed five key banking implementations across the UK and Europe:
- Barclays Bank (1990–1992). Stationed on-site at Knutsford, Cheshire, to design, code, and configure back-end Tandem modules for the Barclays Business Master II (BBM II) corporate desktop banking system.
- Girofon Denmark (1992–1993). Authored touch-tone telephone banking integrations linking Periphonics VRAM interactive voice hardware directly to Tandem NonStop databases for live balance retrieval.
- TSB & Bank of Scotland (1993–1994). Designed and coded mainframe transaction logic for desktop bookkeeping and inter-account money transfers.
- Rabobank (1994–1995). Led code optimization, custom patches, and on-site deployment validation for international banking operations in Utrecht.
