Job Summary

Synechron is seeking a Connex Developer with 3–6 years of experience in the payments domain. The role will focus on developing, enhancing, maintaining, and supporting ACI Connex applications that enable payment transaction processing and switching. The successful candidate will work with Connex scripts, interfaces, message formats, and payment workflows.

The role will contribute to reliable transaction processing, application performance, production stability, and effective delivery of payment solutions through collaboration with business stakeholders, architects, testing teams, and technology teams.

Software Requirements

Required

- ACI Connex: 3–6 years of hands-on development, customization, enhancement, and support experience.
- Connex scripts, interfaces, and message formats: Practical experience designing, developing, maintaining, and troubleshooting payment integrations.
- Payment processing systems: Strong knowledge of payment transaction processing and transaction switching.
- ISO 8583: Understanding of message structures and transaction flows.
- Card payments: Understanding of card-based payment processing.
- ATM/POS processing: Understanding of ATM and point-of-sale transaction processing.
- Acquiring and issuing systems: Understanding of acquiring and issuing transaction flows.
- SQL: Good knowledge of SQL and database concepts.
- Testing: Experience with unit testing, integration testing, defect resolution, and deployment support.
- Production support: Experience troubleshooting application, transaction, and performance-related issues.

Preferred

- Experience supporting Banking and Financial Services projects.
- Experience working in Agile development environments.
- Familiarity with major payment network ecosystems, including Visa, Mastercard, NPCI, or similar networks.
- Experience supporting high-volume transaction processing.
- Experience with payment application monitoring, performance analysis, and operational improvement.

Overall Responsibilities

- Develop, customize, enhance, and maintain applications using ACI Connex.
- Design and implement payment transaction workflows, interfaces, scripts, and message formats.
- Analyze business requirements and translate them into technical solutions.
- Apply knowledge of payment processing, transaction switching, ISO 8583, card payments, ATM/POS processing, and acquiring/issuing systems.
- Support application enhancements, bug fixes, releases, and production issues.
- Work closely with business stakeholders, architects, testing teams, and other technology teams.
- Participate in code reviews and ensure adherence to development standards and project requirements.
- Perform unit testing, integration testing, defect analysis, deployment support, and post-release validation.
- Troubleshoot and resolve application, transaction-processing, integration, and performance-related issues.
- Use SQL and database concepts to investigate and resolve data-related issues.
- Document technical designs, transaction flows, support procedures, and implementation decisions.
- Contribute to stable, efficient, and maintainable payment-processing solutions while considering effective use of processing and infrastructure resources.

Technical Skills (By Category)

Programming Languages

Essential

- Connex scripting and development.
- Ability to analyze and modify scripts supporting payment transaction processing.
- Ability to understand message structures, transaction flows, interfaces, and integration logic.

Preferred

- Experience with additional programming or scripting languages used for automation, testing, monitoring, or support.
- Experience developing reusable utilities for payment application support and troubleshooting.

Databases/Data Management

Essential

- Good knowledge of SQL.
- Understanding of database concepts,



data access, data integrity, and transaction-related records.
- Ability to investigate database and transaction data during application troubleshooting.
- Ability to validate payment data across relevant processing stages.

Preferred

- Experience optimizing SQL queries and database access.
- Experience with reconciliation, transaction reporting, data validation, or payment-related data analysis.
- Experience supporting high-volume transaction data environments.

Cloud Technologies

Essential

- Ability to support Connex applications within the designated project infrastructure and deployment environment.

Preferred

- Experience supporting payment applications in cloud or hybrid environments.
- Familiarity with cloud-based monitoring, deployment, scalability, and resource optimization.
- Experience supporting application modernization or migration initiatives.

Frameworks and Libraries

Essential

- ACI Connex application components.
- Connex scripts, interfaces, message formats, and payment transaction workflows.
- Integration components required for payment switching and transaction processing.

Preferred

- Reusable components and utilities for payment integrations.
- Tools or libraries supporting transaction monitoring, testing, reconciliation, and performance analysis.

Development Tools and Methodologies

Essential

- ACI Connex development, customization, maintenance, and support.
- Unit testing and integration testing.
- Code reviews and development standards.
- Deployment support and production troubleshooting.
- SQL-based investigation and data analysis.
- Defect management and technical documentation.
- Cross-functional collaboration with business, architecture, testing, and technology teams.

Preferred

- Agile development methodologies.
- Experience with source control, build, release, monitoring, and incident-management tools.
- Experience supporting continuous improvement in payment application delivery and production support.

Security Protocols

Essential

- Apply secure development and support practices when handling payment applications, transaction data, interfaces, and production environments.
- Protect payment information, credentials, configuration details, and sensitive transaction records.
- Follow access-control, data-protection, secure configuration, and change-management practices.
- Consider security and compliance requirements when developing and troubleshooting payment-processing solutions.

Preferred

- Experience supporting security requirements for card payments, ATM/POS processing, acquiring, issuing, and transaction-switching systems.
- Experience addressing security findings through testing, code reviews, production support, or remediation activities.

Experience Requirements

- 3–6 years of experience in ACI Connex development.
- Experience in the payments domain, including payment transaction processing and transaction switching.
- Hands-on experience with Connex scripts, interfaces, message formats, and payment workflows.
- Understanding of ISO 8583, card payments, ATM/POS transaction processing, and acquiring/issuing systems.
- Experience with development, application support, production troubleshooting, testing, deployment, and performance issue resolution.
- Good knowledge of SQL and database concepts.
- Experience supporting Banking and Financial Services projects.




- Experience working in Agile development environments and with major payment network ecosystems or similar payment networks.
- Candidates may also qualify through an equivalent combination of relevant payment-technology experience, technical training, demonstrated Connex capability, and successful delivery of comparable transaction-processing solutions.

Day-to-Day Activities

- Develop, enhance, test, and maintain ACI Connex applications, scripts, interfaces, message formats, and payment transaction workflows.
- Collaborate with business stakeholders, architects, testing teams, and technology teams to clarify requirements and support solution delivery.
- Investigate defects, production incidents, transaction failures, and performance issues using application logs, SQL, transaction data, and support procedures.
- Deliver code changes, test results, deployment support, technical documentation, and issue resolutions while making implementation decisions within established standards.

Qualifications

- A bachelor’s degree in Computer Science, Information Technology, Engineering, or a related field is required; equivalent relevant education and experience may be considered.
- 3–6 years of experience in ACI Connex development, payment processing, transaction switching, application support, or a related technical discipline.
- Demonstrated experience with Connex scripts, interfaces, message formats, ISO 8583, card payments, ATM/POS processing, acquiring/issuing systems, and SQL.
- Relevant certifications or training in payment technologies, transaction processing, ACI Connex, application support, or Agile delivery are preferred but not mandatory.
- Maintain continuous professional development in payment processing, transaction switching, Connex capabilities, SQL, testing, production support, security, and modern delivery practices.

Professional Competencies

- Apply structured analytical thinking and problem-solving to investigate transaction failures, application defects, data issues, and performance concerns.
- Collaborate effectively with business stakeholders, architects, testing teams, developers, and production-support teams.
- Communicate technical concepts, transaction flows, risks, issues, and resolutions clearly to technical and non-technical stakeholders.
- Adapt to changing payment requirements, transaction-processing environments, support priorities, and technology practices.
- Identify opportunities to improve payment workflows, application stability, testing, troubleshooting, maintainability, and processing efficiency.
- Manage development tasks, defects, testing activities, incidents, deployment support, documentation, and delivery commitments effectively.

S​YNECHRON’S DIVERSITY & INCLUSION STATEMENT

Diversity & Inclusion are fundamental to our culture, and Synechron is proud to be an equal opportunity workplace and is an affirmative action employer. Our Diversity, Equity, and Inclusion (DEI) initiative ‘Same Difference’ is committed to fostering an inclusive culture – promoting equality, diversity and an setting that is respectful to all. We strongly believe that a diverse workforce helps build stronger, successful businesses as a global company.

We encourage applicants from across diverse backgrounds, race, ethnicities, religion, age, marital status, gender, sexual orientations, or disabilities to apply. We empower our global workforce by offering flexible workplace arrangements, mentoring, internal mobility, learning and development programs, and more.

All employment decisions at Synechron are based on business needs, job requirements and individual qualifications, without regard to the applicant’s gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law.

Candidate Application Notice

📌 ACI Connex Developer – Payment Switching, ISO 8583, ATM/POS & SQL (Chennai)
🏢 Synechron
📍 Chennai