Senior Base24 Developer

Job Title : Senior Base24 / Base24 Classic Developer

Location : Brazil

Client : Fiserv

Budget : $4,500 USD as CONTRACTOR (No benefits)

Duration : Long-term

Employment Type : Full-Time

About the Role

We are seeking an experienced Base24 / Base24 Classic Developer to support payment switch development, enhancement, and operational stability within a high-volume card transaction environment. The ideal candidate has hands-on experience working with Tandem / HP NonStop systems , Base24 modules, issuer / acquirer interfaces, and ATM / POS transaction processing flows.

This role requires strong technical depth in transaction message processing (ISO 8583) , ATM / POS terminal driving , and tuning systems for high availability and performance. The developer will work closely with cross-functional teams including Product, Application Support, Network Security, and Environment Infrastructure.

Key Responsibilities

• Develop, configure, enhance, and support Base24 / Base24 Classic applications on HP NonStop (Tandem) platform .
• Maintain and modify ATM / POS transaction switch modules , authorization, settlement, and device handler components.
• Monitor and troubleshoot end-to-end transaction flows including issuer / acquirer interfaces.
• Analyze and resolve production issues with strong ownership of incident / problem resolution .
• Implement code enhancements, patches, and release changes in alignment with governance and compliance standards.
• Design and execute system integration testing, regression testing, and certification testing with network partners (Visa / Mastercard).
• Work with cross-functional teams to support performance tuning, batch processing, and environment stability.
• Ensure secure, compliant, and resilient handling of financial transaction data.
• Prepare and maintain detailed technical documentation, release notes, and operational runbooks .

Required Skills & Experience

Good to Have

Education