Ascii Group, LLC · 7 hours ago
Base24 Developer
Chicago, IL
Contract
Onsite
Senior Level
5+ years expAscii Group, LLC is seeking an experienced payment systems developer to lead the migration of transaction processing infrastructure from BASE24 Classic to BASE24-eps. The role requires deep technical expertise in both platforms and involves collaborating with multiple teams to ensure a successful transition with minimal business disruption.
Human ResourcesInformation TechnologyStaffing Agency
No H1B
Hiring Manager
Ajay K.
Responsibilities
Analyze existing BASE24 Classic configurations, customizations, and transaction flows to create comprehensive migration specifications
Convert custom transaction processing logic, authorization rules, and routing configurations from Classic to eps framework
Develop and maintain migration scripts, data transformation utilities, and automation tools
Design and implement interface adaptations for upstream systems including card management, fraud detection, and downstream systems such as settlement and reporting platforms
Ensure data integrity throughout the migration process including configuration files, transaction logs, and historical data
Build and configure BASE24-eps transaction processing modules aligned with business requirements
Develop custom exits, user exits, and API integrations within the eps environment
Create comprehensive test scenarios covering functional, integration, performance, and security testing
Troubleshoot complex technical issues across both Classic and eps platforms during parallel operations
Optimize transaction processing performance and system resource utilization in the eps environment
Design and execute detailed test plans including unit, integration, system, and user acceptance testing
Conduct performance benchmarking and load testing to validate throughput and response time requirements
Perform parallel testing comparing Classic and eps transaction outputs to ensure consistency
Document test results, defects, and resolutions comprehensively
Support business teams during UAT and address identified issues promptly
Create detailed technical documentation including system architecture, interface specifications, and operational procedures
Develop runbooks for common operational tasks and troubleshooting procedures
Conduct knowledge transfer sessions for operations, support, and development teams
Maintain configuration management documentation and version control
Work closely with business analysts, architects, QA teams, and operations staff throughout the migration lifecycle
Participate in regular project status meetings and provide accurate progress updates
Coordinate with vendors and third-party system providers for interface testing and validation
Provide post-migration hypercare support and resolve production issues
Mentor junior team members on BASE24 technologies and best practices
Qualification
Required
Minimum 5 years of hands-on experience with BASE24 Classic including system configuration, customization, and operations
Strong experience with BASE24-eps architecture, transaction processing, and configuration (minimum 2 years preferred)
Proficiency in programming languages used in BASE24 environments including C, COBOL, and scripting languages (shell, Perl, Python)
Deep understanding of ISO 8583 message formats, EMV transaction processing, and payment card industry standards
Experience with database technologies including Oracle, DB2, or SQL Server
Knowledge of mainframe and distributed systems environments
Familiarity with version control systems such as Git or SVN
Strong understanding of card payment processing flows including authorization, clearing, and settlement
Knowledge of payment industry regulations and PCI-DSS compliance requirements
Experience with fraud detection systems and security protocols in payment environments
Understanding of high-availability architectures and disaster recovery concepts
Preferred
ACI Worldwide certification in BASE24 Classic and BASE24-eps
Experience with additional payment platforms such as Postilion, Vision PLUS, or similar
Knowledge of cloud technologies and containerization (Docker, Kubernetes)
Experience with CI/CD pipelines and DevOps practices
Familiarity with monitoring tools such as Splunk, Nagios, or similar
Previous experience leading or participating in large-scale platform migration projects
Company
Ascii Group, LLC
ASCII Group, LLC is a full service provider of comprehensive IT staffing services designed to fulfill the needs of local, regional and global companies.
501-1000 employees
Funding
Current Stage
Late StageLeadership Team
Hima Kolanagireddy
President & CEO
Recent News
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