Senior Software Engineer, Chicago

About our client

Our client is the next-generation payment service provider revolutionizing global financial infrastructure with stablecoins, AI-driven fraud prevention, and instant settlement. They enable businesses to grow faster with instant settlement, fraud & chargeback indemnity, global pay-ins, multi-currency FX, and unified payouts. Founded in 2023, the company serves marketplaces, fintechs, remittance providers, gaming platforms, and ecommerce merchants worldwide.

Since their seed round in 2024, they have achieved 23x revenue growth and scaled to multi-billion-dollar annual transaction volume. In response to this growth, the company announced a $25M Series A in October 2025, led by Pantera Capital, CMT Digital, Coinbase Ventures, Jump Crypto, and Reciprocal Ventures, accelerating their mission to power the world’s fastest-moving businesses with innovative, reliable global payments. Our client is proudly headquartered in Chicago, IL.

About The Role

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 the 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. You’ll collaborate closely with Product to shape what we build, with fellow engineers on how we build it, and have significant ownership over the systems you create.

What You’ll Do

Build Core Payment Infrastructure

• Design and implement payment processing systems that handle high throughput and strict reliability requirements
• Build APIs and SDKs that merchants use to integrate the platform into their own
• Develop fraud detection and risk management features using real-time data analysis

Scale Our Platform

• 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

Ship Product Features

• 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

Improve How We Work

• 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

What We’re Looking For

• 5+ years of professional software engineering experience
• Strong proficiency in TypeScript and Node.js; experience with React is a plus
• 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
• Bonus: Experience in payments, fintech, or blockchain/crypto

What’s on offer

Competitive base salary plus an equity grant, allowing you to share in the long-term success of the company. You will also have access to a wide array of benefits, including health and wellness benefits, 401(k) savings plan, and flexible time off.

Join the team rewriting how money moves worldwide, and become a driving force in the $194 trillion cross-border payments market.