Sr. Software Engineer

Join the team rewriting how money moves globally as a Senior Software Engineer at Coinflow
.

Coinflow is a next‑generation payments company headquartered in Chicago, pioneering the way money moves globally. We enable merchants and marketplaces to accept payment methods across 170+ countries with instant settlement, AI‑driven fraud prevention, and blockchain‑based proof‑of‑delivery.

Backed by leading investors—including Pantera Capital, CMT Digital, Coinbase Ventures, Jump Capital, and Reciprocal Ventures—Coinflow recently raised a $25M Series A to accelerate our mission to modernize cross‑border payments. Since our seed round in 2024, we’ve achieved 23x revenue growth and scaled to a multi‑billion‑dollar annual transaction volume run rate.

We're looking for a Senior Software Engineer to help build the core infrastructure powering global payments. You'll design and implement systems that process billions of dollars in transactions, working across our payment orchestration layer, merchant APIs, and real‑time settlement engine. This is a high‑impact role where your code ships to production quickly and handles real money from day one.

• 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
• Balance speed of delivery with code quality and long‑term maintainability

• Contribute to technical decisions around architecture, tooling, and best practices
• Mentor other engineers through code review, pairing, and knowledge sharing
• Help shape engineering culture as the team grows

• 5+ years of professional software engineering experience
• Strong proficiency in Type Script and Node.js; experience with React is a plus
• Deep understanding of REST API design, relational and document databases (especially Mongo
  
  DB), 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
• Bonus:
  Experience in payments, fintech, or blockchain/crypto

Location:

Chicago, IL

Salary: $ – $

Employment type:

Full‑time

Seniority level:
Mid‑Senior level