Software Engineer (ATM)

Responsibilities

• You'll work on real-time transaction flows between ATM hardware and Salmon's backend, handling authorization, reversals, and reconciliation as the fleet scales from pilot to thousands of machines.
• You'll integrate directly with an HSM for PIN translation, key management, and cryptographic operations — core to how every transaction stays secure.
• You'll work closely with hardware, infrastructure, security, compliance, and vendor teams (SmartDico, the processing switch) to keep the ATM stack running end to end.
• Design, build, and maintain backend services for the ATM middleware platform
• Own ISO 8583 message flows between the ATM fleet and the processing switch, including authorization, reversals, and reconciliation
• Integrate with the HSM for PIN translation, key management, and cryptographic operations
• Build and maintain integrations with card schemes and the ATM middleware vendor
• Improve APIs and system integrations across the ATM stack, including anti-fraud and core banking connections
• Support production monitoring, incident investigation, and resolution for ATM transaction services

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