Design, build, and harden Android VPN functionality: implement VpnService/TUN-based tunnels, integrate VPN protocols (WireGuard/OpenVPN/IKEv2), optimize native libraries via NDK/JNI, ensure security/privacy, prevent leaks, and support release and Play Console workflows. Deliver stable, low-battery-impact connections and production-grade deployments.

Convert data‑science prototypes into production ML services; build and operate Databricks/Spark pipelines reading/writing Snowflake; manage full model lifecycle (MLflow, CI/CD, retraining, drift monitoring); deliver/version audience segments to ad‑tech partners; ensure scalability, cost efficiency, privacy, and mentor engineers.

Administer and maintain RHEL and OpenShift clusters on bare-metal, manage node lifecycle and hardware (Dell), apply patches/upgrades, monitor cluster and hardware health, support IBM Watson/Cloud Pak deployments, manage storage and backups, implement security hardening, coordinate vendor and colocation support, document runbooks and perform incident response.