Calling all innovators - find your future at Fiserv. We're Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants, and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we're involved. If you want to make an impact on a global scale, come make a difference at Fiserv. Job Title Senior Application Developer About Your Role: As an Senior Application Developer, you will provide critical application support and development expertise for our client in Milan, a strategically important client generating high revenue annually. The role is customer-facing and requires an Italy-based, Italian-speaking technical advisor who can respond promptly during local business hours and provide out-of-hours (OOH) support for high-severity incidents. You will act as a trusted technical point of contact, ensuring application stability, rapid incident resolution, and effective communication with client stakeholders. This role is essential to maintaining service continuity, meeting strict service expectations, and protecting a key revenue stream. What you'll do: Provide application development and production support for Numia-owned systems and integrations Act as first-line advisor for application incidents, analysis, and resolution during Italian business hours. Participate in out-of-hours (OOH) support for critical production issues as required Diagnose and resolve application defects, performance issues, and integration failures Perform root cause analysis (RCA) and implement corrective and preventive actions Collaborate closely with Numia stakeholders, internal development teams, and infrastructure partners Support deployments, patches, and minor enhancements to ensure platform stability Ensure incidents and changes are managed in line with agreed SLAs and governance processes. Maintain accurate technical documentation and incident records Contribute to continuous improvement of support processes and application resilience Experience you'll need to have: Strong working knowledge of credit/debit card lifecycle, transactions, authorisations, clearing, settlement, and billing Hands-on experience with mainframe technologies, including: CICS (online transaction processing), DB2 (data access and analysis) Ability to analyse and troubleshoot issues using mainframe utilities and tools, including Eazytrieve Experience supporting API-based integrations between distributed systems and mainframe applications Solid understanding of production support, incident triage, root-cause analysis, and escalation in a 24×7 environment Experience working directly with client-facing payment systems, responding to time-critical and business-impacting incidents Fluent Italian and English (spoken and written) Willingness to participate in out-of-hours (OOH) support as part of a support rota Experience that would be great to have: Strong background in cards and payments platforms, preferably within large-scale financial services environments Experience with VisionPLUS modules (e.g. issuing, authorisation, settlement, or billing components) Experience with distributed-to-mainframe integration architectures, including middleware and APIs Experience operating within ITIL-aligned incident, problem, and change management frameworks Prior responsibility for supporting strategic, high-revenue clients with strict SLA expectations \LI-SV1 Thank you for considering employment with Fiserv. Please: Apply using your legal name Complete the step-by-step profile and attach your resume (either is acceptable, both are preferable). Our commitment to Diversity and Inclusion: Fiserv is proud to be an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, gender, gender identity, sexual orientation, age, disability, protected veteran status, or any other category protected by law. Note to agencies: Fiserv does not accept resume submissions from agencies outside of existing agreements. Please do not send resumes to Fiserv associates. Fiserv is not responsible for any fees associated with unsolicited resume submissions. Warning about fake job posts: Please be aware of fraudulent job postings that are not affiliated with Fiserv. Fraudulent job postings may be used by cyber criminals to target your personally identifiable information and/or to steal money or financial information. Any communications from a Fiserv representative will come from a legitimate Fiserv email address.