Senior Software Engineer - Base24-eps

GSSTech Group

ExclusiveSeniorPublished May 21, 2026

Apply directly on GSSTech Group’s careers site — no account needed.

About the role

We are looking for an experienced Senior Software Engineer – Base24-eps Switch Developer to join a high-performing payments engineering team supporting enterprise banking and financial platforms. The ideal candidate will have strong expertise in Base24-eps payment switch development, real-time transaction processing, and HP NonStop/Tandem environments.

This role involves designing, enhancing, optimizing, and supporting mission-critical payment switch systems operating in highly available production environments.

Requirements

Key Responsibilities

  • Design, develop, and maintain Base24-eps payment switch applications and interfaces.
  • Implement and support ISO8583, EMV, POS, and ATM transaction flows.
  • Develop solutions using:
    • TACL
    • TAL
    • SCOBOL
    • COBOL
    • C/C++
  • Troubleshoot production issues and provide permanent resolutions.
  • Perform performance tuning, system optimization, and capacity planning.
  • Support platform upgrades, migrations, and modernization initiatives.
  • Collaborate with QA, DevOps, and Infrastructure teams for smooth production releases.
  • Ensure adherence to security, compliance, and audit standards.

Required Skills & Experience

  • 5–12 years of experience in Base24-eps development and support.
  • Strong expertise in HP NonStop/Tandem systems.
  • Deep understanding of:
    • ISO8583
    • EMV
    • POS/ATM transaction processing
    • Payment switching systems
  • Experience integrating with:
    • Card schemes
    • Host banking systems
    • Third-party payment processors
  • Strong debugging, troubleshooting, and production support skills.
  • Experience with performance tuning and high-availability systems.
  • Familiarity with CI/CD pipelines and deployment automation.
  • Excellent communication and stakeholder management skills.

Preferred Skills

  • Experience with Base24 Classic or other payment switch platforms.
  • Exposure to:
    • HSMs
    • Tokenization
    • Fraud detection systems
    • Risk engines
  • Knowledge of cloud-based payment architectures.
  • Prior experience working with banking or financial services clients is preferred.

Suitable candidates with strong Base24-eps and Tandem experience are highly preferred.

Skills

  • Node.js
  • JavaScript
  • TypeScript
  • REST
  • Docker
  • Kubernetes
  • GitHub Actions
  • Azure

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