Tandem Developer

Role Title: Tandem Developer

Location: London, UK - Hybrid (Days on site: 2-3/Week)

Job Type: Contract

Role Description:

We are seeking an experienced Tandem Developer to join our technology team in London, specialising in Cards domain and banking applications. The ideal candidate will have deep expertise in HP NonStop (Tandem) systems and hands-on experience in payment processing, card transaction systems, and integration with banking platforms. This role involves developing, maintaining, and optimizing mission-critical applications in a high-availability environment.

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Key Responsibilities:

• Application Development & Maintenance:

o Design, develop, and maintain applications on the HP NonStop (Tandem) platform.

o Work with TACL, COBOL, C, and Guardian for application development and support.

• Cards & Banking Domain Expertise:

o Implement solutions for card transaction processing, settlement, and authorization systems.

o Integrate with core banking systems, payment gateways, and regulatory compliance frameworks.

• System Analysis & Optimization:

o Perform system analysis, troubleshooting, and performance tuning for high-volume transaction environments.

• Compliance & Security:

o Ensure adherence to PCI DSS, security standards, and regulatory requirements.

• Collaboration & Governance:

o Work closely with business analysts and stakeholders to deliver robust, scalable solutions.

• Production Support:

o Provide L2/L3 support for critical banking and card systems, ensuring minimal downtime.

Required Skills & Experience:

• Technical Expertise:

o Strong experience with HP NonStop (Tandem) systems.

o Proficiency in TACL, COBOL, C, Guardian, and Enscribe/NonStop SQL.

o Knowledge of ISO 8583 messaging, batch and online transaction processing.

• Domain Knowledge:

o Hands-on experience in Cards domain (credit/debit card processing, EMV standards, tokenization).

o Familiarity with Base24, payment systems, and financial transaction processing.

• Other Skills:

o Strong problem-solving and analytical skills.

o Experience with fault-tolerant systems and high-availability architectures.

Preferred Qualifications:

• Experience with modernization strategies for legacy Tandem applications.

• Exposure to Visa/Mastercard schemes, fraud prevention, and settlement processes.

• Banking certifications or domain-specific training in cards/payments.