At CSS, we're building the definitive operating system for restaurants. The Money team is the financial engine at the core of our platform, responsible for ensuring that every dollar is processed, moved, and accounted for with impeccable accuracy and reliability. We build the critical infrastructure that allows restaurants to process payments, get paid and grow their business.

We are looking for a seasoned Senior Software Engineer to help us design and build the next generation of our financial products. You will tackle complex challenges in payments, money movement, fraud prevention, and financial automation.

What You’ll Do

As a Senior Engineer on the Money team, you will architect, build, and scale the mission-critical systems that handle our financial operations. Your work will be pivotal in building trust with our customers and enabling new product capabilities. You’ll have opportunities to focus on:

• Engineer and maintain our core payment capabilities, focusing on high availability, security, and scalability. You'll ensure every transaction is fast, secure, and reliable.
• Develop robust, reliable APIs and services that power money movement to help restaurants manage their cash flow effectively.
• Build the backend systems for customer-facing products like billing & invoicing.
• Build and design systems to improve fraud detection and response.

Core Responsibilities

• Architect and implement highly available, fault-tolerant backend systems and APIs for payment processing, money movement, fraud, and financial reconciliation.
• Collaborate closely with product managers, business stakeholders and other engineers to design and deliver business goals.
• Drive technical excellence through rigorous code reviews, automated testing, and clear documentation.
• Mentor other engineers and lead complex technical projects, contributing to the team's long-term vision and strategy.

What We’re Looking For

We value engineers who are passionate about building resilient, trustworthy financial systems and are excited to solve complex problems in the payments domain.

Basic Qualifications:

• Proficiency in backend programming languages like Java or Go.
• Familiarity with relational and/or NoSQL databases (e.g., PostgreSQL, MongoDB, Redis).
• Experience with cloud platforms like AWS, Google Cloud, or Azure.
• Understanding of RESTful APIs, microservices, and distributed systems.
• Strong debugging and problem-solving skills.

Preferred Qualifications:

• 5+ years of professional software engineering experience, with significant time spent in payments, billing, or financial technology.
• Deep understanding of the payment processing lifecycle, including authorization, capture, settlement, and reconciliation.
• Direct experience with payment gateways (e.g., Stripe, Adyen, PayPal).
• Demonstrated experience in architecting and operating large-scale, fault-tolerant distributed systems that handle financial data.
• Knowledge of fraud detection techniques and experience building or integrating with risk management systems.

Why Join Us?

• Demand for online food delivery is growing really fast! In the last 5 years, just in the US, the overall market has expanded 10X from $10B to $100B, and could expand to $500bn- $1T by 2030.
• Changing the restaurant industry: You’ll be part of a team that helps restaurants succeed in online food delivery. 
• Collaborative environment: You will work with a talented and diverse team that values innovation and learning. You will receive support and guidance from experienced colleagues and managers, helping you to learn, grow and achieve your goals, and you’ll work closely with other teams to ensure our customer’s success.
• Career Growth: Opportunities for advancement across engineering tracks, from individual contributors to leadership roles.
• Exciting Projects: Contribute to products and systems used by millions worldwide.

What else you need to know:

This role is based in our NYC office location. As a company driven by innovation and continuous change, close collaboration is essential. We’re constantly reimagining our industry, creating new products, and refining our processes, and we do our best work together. That’s why all of our office-based teams work onsite, five days a week.