Senior Ruby Software Engineer

Ciklum is looking for a Sr. Ruby Software Engineer to join our team full-time in the Canada.

We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live.

About the role:

As a Senior Ruby Software Engineer, become a part of a cross-functional development team, engineering experiences of tomorrow. This role requires strong backend engineering skills, combined with practical knowledge of payment systems, banking integrations, and financial data security.

Responsibilities:

• Develop and maintain highly reliable payment processing services using modern backend frameworks (Ruby on Rails or PHP/Laravel)
• Build and integrate EFT, ACH, and credit card workflows, including NACHA file generation, batch processing, card vaulting, and settlement reporting
• Create secure, scalable, and well-documented APIs for financial transactions
• Implement real-time and batch payment systems that meet financial industry compliance standards
• Apply Test-Driven Development (TDD) practices to ensure high-quality, maintainable code
• Collaborate with product and operations teams to define technical solutions for new payment features
• Write clean, efficient, and testable code
• Participate in code reviews and mentor junior developers
• Troubleshoot and resolve complex production payment issues in a timely manner
• Ensure data integrity, security, and compliance (PCI DSS, SOC 2, etc.) in all software components

Requirements:

• 8+ years of experience in backend software development, with deep expertise in Ruby on Rails
• Experience in financial technology (FinTech), banking, or payment processing
• Hands-on experience with EFT, ACH, credit card payment gateways, and NACHA file formats
• Deep understanding of Test-Driven Development (TDD) and automated testing frameworks (e.g., RSpec, MiniTest, PHPUnit)
• Strong knowledge of RESTful API development and secure data handling
• Experience with SQL (MySQL, PostgreSQL, or other relational databases)
• Understanding of event-driven architectures, microservices, and message queues (e.g., RabbitMQ, Kafka)
• Solid grasp of data security, encryption, and compliance regulations
• Familiarity with CI/CD pipelines, Docker, and cloud services (AWS, Azure, or GCP)
• Knowledge of financial messaging standards and APIs (e.g., ISO 20022, SWIFT, FedWire, etc.) is a plus
• Strong problem-solving and debugging skills
• Excellent communication and teamwork abilities

Desirable:

• Experience with both Ruby on Rails and Laravel
• Experience with real-time payments (RTP, FedNow)
• Prior work with card issuing, card acquiring, or merchant services
• Experience in high-availability, high-throughput financial transaction systems
• Experience working in an Agile SCRUM environment

About us:

At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. In the US, Ciklum is growing fast—inviting experienced professionals to lead digital transformation alongside Fortune 500 clients. Be part of a company where innovation and impact go hand in hand.

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Explore, empower, engineer with Ciklum!

Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum.