Developed gRPC microservices for on-chain analytics, calculating PnL, ROI, and price metrics from Ethereum transaction data. Built transaction graph analysis to track fund flows, identify wallet clusters, resellers, and high-interaction entities. Implemented Flashbots-based anti-MEV strategies to ensure private transaction execution and mitigate front-running and sandwich attacks.
Led the development of an event-driven Moodle data platform with MongoDB as the primary datastore and Kafka as the messaging backbone. Implemented change-data capture logic to detect academic data updates and propagate events to mobile clients in near real-time. Designed fault-tolerant Kafka consumers and notification pipelines integrating Firebase Cloud Messaging for scalable push delivery. Developed periodic synchronization and reconciliation services to ingest external API data while handling partial failures and data drift. Exposed high-performance HTTP endpoints using Actix Web, emphasizing async execution and low-latency I/O.
Built and maintained iOS applications with VPN support using Network Extension APIs and secure Keychain storage. Worked with WireGuardKit and traditional VPN protocols (IKEv2, IPSec). Integrated third-party services including Yandex Mobile Ads, Apple/Google authentication, and push notifications.