Form3 seeks Senior Software Engineer contractors to design, implement and test US payments gateway functionality (Zelle and Fedwire) using Go on a cloud-native platform. Work includes building payment flows, scheme-specific behaviour, automated integration tests, resilience/performance and operational readiness. Role is contract-based, 100% remote for contractors located in Ontario, Canada (first day in-office to collect equipment).

Work as a Senior Software Engineer developing, operating and owning cloud-native Go microservices that power real-time payment flows. The role focuses on reliability, high availability, low-latency performance, and operational excellence using technologies such as Go, Kubernetes, CockroachDB and NATS JetStream. The position is remote (UK/EU) with hiring explicitly listed for Germany, Netherlands, Portugal, Spain and the United Kingdom.

100% remote (Europe) contract role delivering hands-on platform and security engineering for Form3's cloud-native payments systems. Responsibilities include designing and building distributed, production-ready capabilities across API security, cryptographic controls, AI governance, software supply chain security and automated security tooling using Go and cloud/container technologies (AWS/GCP/Azure, Kubernetes). Contractors must be based in one of the listed European countries and will start their first day in a local office to collect equipment.