Antonio Fernandez

Managed FinTech projects including credit checkout, onboarding, and fraud systems used by 2 million users. Built a merchant checkout platform handling €60 million per month with 99.99% uptime and 150 ms average response times. Engineered real-time fraud scoring microservices that reduced manual review workload by 28%. Developed and maintained loans scoring and risk APIs with historical audit trails across three markets. Created a GraphQL API gateway improving API observability by 40%. Implemented compliance administration panels in Sweden, Finland, and Norway. Contributed to legacy platform modernization using .NET Core, Node.js, PHP, and NestJS achieving 85% test coverage with 40ms faster response times. Delivered features in agile squads improving stakeholder sign-off predictability. Integrated Strapi CMS to dynamically manage marketing pages and legal content enabling non-technical teams to update 50 customer-facing assets without developer support.

Worked on a mobile-first platform for consumer loans, account servicing, and credit scoring. Developed core loan origination logic submission flows used by 150,000 users. Built backend services for SEPA transfers and balance tracking with automated reconciliation. Created an account management dashboard and managed support requests. Integrated real-time alert system notifications with error monitoring. Implemented secure authentication flows following audit standards. Led backlog grooming and sprint planning to improve release quality.

Developed core modules for shop management and shipping settings for DIY online shop platforms supporting 1,000 stores. Built and optimized checkout engine peak campaigns. Created responsive storefront templates and improved payment gateway reliability with fallback logic. Collaborated in 2-week sprint cycles with QA and product teams delivering over 40 stable production releases.