Golang Engineer - Payment Gateway

We are building a high-performance, PCI-DSS compliant payment gateway that processes millions of transactions daily across cards, open banking, alternative payment methods, and crypto on-ramps. You will design, implement, and own critical components of the payment orchestration, authorization, settlement, and reconciliation layers written primarily in Go.

Key Responsibilities

• Design and develop highly concurrent, low-latency microservices in Go for payment authorization, routing, risk checks, and settlement
• Implement and maintain payment scheme integrations (Visa, Mastercard, local schemes, APM providers, open banking)
• Build resilient transaction processing pipelines with idempotency, retries, circuit breakers, and distributed tracing
• Work on ledger systems, balance management, and real-time reconciliation
• Optimize for throughput, latency, and cost under high load
• Collaborate with compliance, security, and product teams to meet regulatory requirements (PCI-DSS, PSD2, GDPR, etc.)
• Participate in architecture decisions, code reviews, and on-call rotation for payment-critical services
• Contribute to observability (metrics, structured logging, distributed tracing) and operational excellence

Required Skills & Experience

• Strong production experience with Go (concurrency patterns, channels, context, error handling, testing)
• Hands-on experience building or working on payment gateways, payment processors, or high-volume transaction systems
• Solid understanding of payment flows: authorization, capture, void, refund, chargeback, 3DS, tokenization
• Experience with relational databases (PostgreSQL preferred) and at least one message broker / event system (Kafka, NATS, RabbitMQ, etc.)
• Knowledge of distributed systems concepts: eventual consistency, idempotency, exactly-once semantics, saga patterns
• Familiarity with containerization (Docker) and orchestration (Kubernetes)
• Experience with observability tools (Prometheus, Grafana, OpenTelemetry, Jaeger)

Nice to Have

• Experience with PCI-DSS environments and secure coding practices for payment data
• Knowledge of ISO 8583, card schemes, or open banking APIs (TrueLayer, Plaid, etc.)
• Experience with Go frameworks/libraries commonly used in fintech (e.g., gRPC, chi/fiber/echo, sqlc/pgx, go-kit)
• Background in ledger or double-entry accounting systems
• Experience with multi-currency, FX, or cross-border payments
• Contributions to open-source Go projects or payment-related libraries

What We Offer

• Competitive salary + equity 
• Fully remote-friendly culture with flexible hours
• Modern tech stack and high ownership over critical payment infrastructure
• Opportunity to work on systems that move real money at scale
• Strong engineering culture focused on reliability, security, and clean code