Software Engineer – ATM Middleware

About the role

As a Software Engineer you will build the middleware that connects Salmon’s ATM fleet to backend systems, scaling from a pilot network to thousands of machines across the Philippines. You will work on real‑time transaction flows, PIN translation, and integration with processing switches and card schemes.

Key responsibilities

• Design, develop and maintain backend services for the ATM middleware platform.
• Own ISO 8583 message flows, including authorization, reversals and reconciliation.
• Integrate with a Hardware Security Module for PIN translation, key management and cryptographic operations.
• Build and maintain integrations with card schemes, the ATM vendor, and anti‑fraud and core banking systems.
• Support production monitoring, incident investigation and resolution for ATM transaction services.

Required profile

• 3+ years of experience as a Backend Engineer, preferably in fintech, banking or payment processing.
• Strong knowledge of ISO 8583 or similar financial messaging protocols.
• Experience with cloud infrastructure (AWS/EKS), containerised deployments and GitLab/GitOps CI/CD pipelines.
• Proficient SQL skills for data analysis and validation.
• English level B2 or higher with solid written and verbal communication.

Required skills

• Kotlin
• Microservice architecture
• API design
• ISO 8583 messaging
• AWS / EKS
• Containerisation (Docker, Kubernetes)
• GitLab / GitOps CI/CD
• SQL
• HSM integration for PIN translation

What we offer

• Ownership and flexibility with a stock option plan.
• Fully remote work with core collaboration hours 12:00–18:00 PM Manila time.
• Company‑provided tools, equipment and health benefits.
• 22 vacation days, Philippine public holidays and 15 sick days.
• Opportunities for learning, conferences and internal expert meet‑ups.
• Company‑sponsored trips to Manila and a dedicated beach‑house week for high‑performing teams.