Ing. Kristi Fidani

• Developed a cross-platform, open-source SDK in Rust with FFI bindings for Swift (iOS), Java (Android), and TypeScript (Web). • Designed backend services in a distributed payment architecture, delivering secure APIs using OAuth and OIDC. • Implemented a customer UI dashboard with Dioxus, enabling real-time access and interaction with ETOPay backend services. • Integrated digital wallet infrastructure with DLT networks, including EVM, ERC-20 smart contracts, and IOTA Rebased.

• Developed an HTTP Kafka ingestion service handling 40k req/s at ~26 ms latency, 20x Digazu’s peak load. • Designed Avro serialization of nested JSON with Confluent Schema Registry and acknowledged delivery. • Cut latency ~10x, scaling from 250 to 1,000 concurrent clients via channel-based caching and client reuse. • Developed a REST admin API, Docker Compose setup, and GitLab CI integration tests against real brokers.

• Learned Rust and Tokio to design Digazu’s new push ingestion service as an alternative to polling connectors. • Built and benchmarked proofs of concept in several web frameworks, selecting Actix Web for its maturity. • Scaffolded the production codebase with environment-based configuration and an initial server setup.