Senior Ruby Developer (Ruby & Go)

Accountabilities

• Design, build, maintain, and own backend services using Ruby on Rails and Go, with a focus on scalability, reliability, and maintainability.
• Lead the integration of new payment service providers and payment methods, including cards, bank transfers, cryptocurrency, and local payment solutions.
• Build and maintain end-to-end deposit and withdrawal workflows, ensuring secure and consistent movement of funds across the platform.
• Design, implement, and consume PSP APIs, webhooks, callbacks, and other integration mechanisms.
• Develop transaction routing, status tracking, reconciliation, and payment lifecycle logic.
• Implement robust handling for payment states, retries, idempotency, failures, and edge cases to ensure resilient transaction processing.
• Maintain strong security controls for payment information and support compliance requirements, including PCI DSS.
• Monitor existing payment provider integrations, troubleshoot issues, and proactively improve reliability and performance.
• Develop reporting, logging, and observability capabilities that support payment operations and technical troubleshooting.
• Support the integration of anti-fraud, AML, and KYC controls into payment workflows.
• Provide technical leadership through architecture discussions, code reviews, technical decision-making, and mentorship of other engineers.

Requirements

• 5+ years of backend engineering experience, particularly in API-driven and integration-heavy environments.
• Strong professional experience with Ruby and Ruby on Rails, with production-level experience in Go strongly preferred.
• Proven experience integrating payment service providers, payment gateways, or comparable financial APIs.
• Strong understanding of payment flows, webhooks, callbacks, transaction lifecycles, and payment states.
• Knowledge of PCI DSS and secure handling of sensitive financial and payment data.
• Hands-on experience with reconciliation, idempotency, retries, error handling, and other patterns required for reliable financial transactions.
• Experience designing, developing, and scaling distributed backend systems.
• Previous experience in fintech, payments, Forex, CFD brokerage, or related financial technology environments is preferred.
• Strong understanding of backend reliability, security, observability, and performance considerations.
• Excellent attention to detail, with a strong focus on building secure and dependable financial systems.
• Ability to communicate technical decisions clearly and contribute effectively to an international, collaborative engineering team.

Benefits

• Fully remote position.
• Monday–Friday schedule, from 9:00 to 18:00.
• Visa sponsorship.
• Medical insurance starting from the first week.
• Career growth opportunities within a fast-scaling fintech environment.
• Opportunities to participate in international events, meetups, and business trips to global offices.
• Exposure to international payment technologies, financial products, and high-scale backend systems.