Job Overview

Remote Principal Engineer of On-Device Privacy-Preserving Payments, Offline Transaction Arbitration & Cryptographic State Recovery — Oman

Location: Remote (Device-centric payment modernization within Oman)

Employment Type: Full-Time

Seniority: Principal Payment Systems Engineer

Role Mandate

This role architects the technology required for secure, privacy-preserving device-native payments, enabling offline settlement arbitration, encrypted credential anchoring, and cryptographic state recovery when network access is inconsistent.

You will construct a mobile-grade payment framework hardened against device compromise, replay attacks, and offline double-spending.

Core Functional Responsibilities

On-Device Settlement Logic

• Deploy trusted execution enclave (TEE) payment modules isolating payment logic from the OS.

• Implement state journals anchoring:

  • transaction limits,

  • incremental spend caps,

  • time-boxed token validity.

Offline Transaction Arbitration

• Establish arbitration rules ensuring:

  • no double settlement,

  • sequential transaction integrity,

  • merchant confidence without network confirmation.

• Apply delayed reconciliation algorithms to restore ledger consistency post-connectivity.

Cryptographic State Recovery

• Construct recovery layers using:

  • Merkle root state snapshots,

  • rotating ephemeral key hierarchies,

  • spend proofs anchored to prior transaction lineage.

Privacy-Preserving Analytics

• Generate statistical insights without revealing granular consumer behavior.

• Apply differential privacy with elastic budget allocation.

Resilience Against Device Compromise

• Deploy dynamic revocation lists halting compromised device spend capabilities.

• Introduce device risk scoring incorporating:

  • OS integrity drift,

  • root/jailbreak detection,

  • telemetry entropy anomalies.

Performance Optimization

• Compress cryptographic proofs to mobile-safe footprints.

• Utilize GPU-assisted hashing for latency minimization.

Preferred Experience

• 9+ years in device security, offline payment rails, or distributed cryptographic protocols.

• Deep familiarity with zero-knowledge spend attestations and key custody models.

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