Senior Backend Engineer, Revenue Engine (Pricing)

CookUnity is a food delivery platform that connects consumers with chefs, delivering 50 million meals annually. They are seeking a Senior Backend Engineer to join the Revenue Engine Squad, responsible for developing scalable backend systems for payment processing and enhancing the financial infrastructure of their eCommerce marketplace.

Responsibilities:

• Design, develop, and maintain scalable backend services for payment processing, pricing, refunds and promotions
• Optimize payment success rates by improving retry mechanisms, fraud detection, and error handling
• Develop and implement features to support promotions, subscriptions, and order finalization workflows
• Work on multi-currency support and international payment processing
• Define and uphold engineering best practices in security, scalability, performance, and code quality
• Improve the maturity of our technical stack through engineering best practices and process automation
• Monitor and enhance system performance
• Participate in code reviews, mentorship, and technical decision-making
• Collaborate with cross-functional teams including finance, legal, and security to ensure compliance and fraud prevention

Requirements:

• 5+ years of experience in backend development, with expertise in Kotlin, Java, and SQL databases (PostgreSQL or MySQL)
• Strong knowledge of payment processing systems and experience integrating with third-party payment providers like Stripe, PayPal
• Experience designing and building scalable cloud-based architectures and distributed systems
• Expertise in service-oriented architectures, API design, and microservices development
• Strong knowledge of database design, implementation, and query optimization
• Experience with system performance monitoring, logging, and observability
• Ability to write clean, maintainable, and testable code
• Advanced level of English with strong communication skills, both verbal and written
• Strong AI-first mindset with a track record of proactively identifying workflows or product areas that can be enhanced through AI-driven solutions
• Experience working in high-transaction volume eCommerce or fintech environments
• Knowledge of PCI compliance, fraud detection, and payment security best practices
• Experience with Saga pattern and orchestration frameworks such as Temporal to manage distributed transactions and workflows
• Experience with event-driven architectures and message queues (e.g., Kafka, RabbitMQ)
• Experience in subscription billing models and recurring payments
• Prior experience working in a fast-paced startup environment