Senior Software Engineer

The role

You will design and implement core payment infrastructure, including payment processing systems, APIs, and SDKs. You will also architect scalable systems and develop fraud detection features.

What you will do

• Design and implement payment processing systems that handle high throughput and strict reliability requirements
• Build APIs and SDKs that merchants use to integrate Coinflow into their platforms
• Develop fraud detection and risk management features using real-time data analysis
• Architect systems for performance, reliability, and observability at scale
• Optimize database queries, caching strategies, and service communication patterns
• Instrument services for monitoring, alerting, and debugging production issues
• Work end-to-end on features from technical design through deployment and iteration
• Collaborate with Product and Design to translate requirements into elegant technical solutions
• Contribute to technical decisions around architecture, tooling, and best practices
• Mentor other engineers through code review, pairing, and knowledge sharing

Required qualifications

• 5+ years of professional software engineering experience
• Strong proficiency in TypeScript and Node.js
• Deep understanding of REST API design, relational and document databases (especially MongoDB), and distributed systems concepts
• Experience building systems that handle high transaction volumes or strict correctness requirements
• Comfortable with cloud infrastructure (AWS, GCP, or similar) and containerized deployments
• Track record of shipping and maintaining production systems
• Clear communicator who can discuss technical tradeoffs with engineers and non-engineers alike

Nice to have

• experience with React
• Experience in payments, fintech, or blockchain/crypto

Benefits

• health and wellness benefits
• 401(k) savings plan
• flexible time off
• equity grant

About the company

Coinflow is a payment service provider specializing in global financial infrastructure with stablecoins, AI-driven fraud prevention, and instant settlement. Headquartered in Chicago, the company serves marketplaces, fintechs, remittance providers, gaming platforms, and ecommerce merchants.