Back-end Engineer (Trading Infrastructure)

Experience and Skills

• Senior backend engineer with 5+ years of experience building production systems
• C1 English level or higher
• Proven production experience integrating trading platform APIs (Rithmic/R|API+, Tradovate, Ignite, cTrader, MetaTrader, CQG, or similar)
• Strong C# for backend service development
• Expert-level REST API consumption: pagination, retry logic with exponential backoff, rate limiting, token management
• Production webhook implementation with signature verification (Ed25519 or HMAC) and idempotent event processing
• Robust error handling, monitoring, and failover system design for high-stakes financial environments
• Advanced SQL skills (PostgreSQL preferred) including cross-table data integrity debugging

Skills

• C#
• .NET
• REST API
• PostgreSQL
• Webhook security
• Ed25519
• HMAC
• Trading platform APIs
• Rithmic
• R|API+
• cTrader

Projects

You will own the entire trading account integration and reporting infrastructure for a high-volume prop firm. This role centers on managing account lifecycles across multiple trading platforms (Tradovate, Rithmic, cTrader, MetaTrader, CQG), building failsafe end-of-day processing workflows, and ensuring subscription-to-account integrity. Your systems will handle significant financial flows, requiring resilient error handling, automatic recovery mechanisms, and proactive monitoring to prevent trader impact. You will work independently while coordinating with WooCommerce and frontend teams to maintain seamless subscription flows.

Key Responsibilities

• Own all trading platform integrations: account creation, suspension, reactivation, and balance adjustments across current (Ignite/Tickblaze) and future platforms
• Ensure reliable end-of-day reporting workflows that process correctly and update trader dashboards without disruption
• Build monitoring and alerting around EOD failures, sync issues, and webhook delivery failures to catch problems before trader impact
• Develop automatic recovery systems with retry logic, token refresh, and idempotent operations to minimize downtime and manual intervention
• Reconcile WooCommerce subscription statuses with trading accounts to ensure only paid users retain active access
• Create audit tools to detect and resolve ghost accounts, orphan statistics, and balance chain inconsistencies

Nice to Have

• Java
• Spring Boot
• Docker
• AWS
• DigitalOcean
• fintech compliance