Nikiforos Krikelas
Software Engineer @Visa
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WORK HISTORY
Software Engineer @Visa
Own end-to-end delivery of 8 cross-border payment microservices (Java 17 / Spring Boot) within a distributed, fault-tolerant architecture handling millions of daily transactions; led design, implementation, and production rollout of banking integration features with zero P1 incidents post-launch.• Designed and shipped an internal RAG prototype (embeddings + vector DB + LLM orchestration) adopted by engineers and product reducing bank integration documentation lookup by an estimated 60%; presented at hackathon to senior management panel of judges.• Overhauled Splunk observability layer and runbooks for cross-border payment services; named primary escalation point for P1/P2 triage, consistently restoring service within SLA and maintaining high availability targets for cross-border payment flows.• Utilise automated CI/CD pipelines and integration tests (GitHub/Jenkins), reducing manual deployment steps and improving release consistency, enabling reliable same-day deployments across 8 services.
EDUCATION
Doukas School
IB Diploma
University of Surrey
BSc (Hons) , Computer Science
Ionios School
High School Diploma
ABOUT NIKIFOROS KRIKELAS
Java backend engineer with 6 years building high-throughput payment infrastructure at Visa and Daiwa Capital Markets. Owns production microservices within distributed systems processing millions of daily transactions in Java 17 / Spring Boot, with a track record of reducing incident MTTR and improving release velocity. One of the early practitioners in the team to ship an LLM/RAG prototype for internal tooling — bringing rare depth across both payments engineering and quantitative risk systems.
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