SeniorSoftwareEngineer

Our customer is developing next-generation infrastructure for institutional digital asset trading and payments, connecting clients, liquidity providers, exchanges, banks, and payment networks through a low-latency, event-driven platform. As part of this transformation, the legacy systems are evolving into a modern distributed architecture powered by Go, NATS, Redis, and Postgres, while maintaining interoperability with existing Java/Spring and RabbitMQ services throughout the migration. The customer's platform enables real-time value movement across trading, treasury, settlement, and payment operations. We are seeking a Senior Software Engineer to architect and develop payment integrations and financial infrastructure services – the core layer that enables seamless connectivity between the customer's platform and external payment providers, banking networks, custodians, and fintech ecosystems. This role combines expertise in payment systems, treasury and settlement operations, asynchronous transaction processing, API integrations, and distributed systems engineering. You’ll contribute to both modern Go-based services and existing Java systems, supporting the development of robust, scalable payment features while driving upgrades to legacy infrastructure **Requirements** * Strong experience in Go and/or Java (you’ll use both); C++ can be considered as well; * Strong API integration experience, including REST APIs, webhooks, idempotency handling, error recovery, authentication and authorization, retries and backoff strategies * Experience with Kafka, NATS, RabbitMQ, Redis, and PostgreSQL * Excellent production debugging and troubleshooting skills * Strong expertise in concurrency, distributed architectures, and system performance optimization * Familiarity with Kubernetes and AWS deployments * Payments / financial systems experience (reconciliation workflows, transaction lifecycle management, stablecoin or digital asset payment rails, ledgering systems, banking or fin