Senior Software Engineer, Card Authorization

<div class="content-intro"><p>Lithic is the modern card issuing and processing platform empowering ambitious financial companies to build the future of payments.</p> <p>Our infrastructure powers card programs for 100+ innovative clients, from fintechs reimagining credit and digital banking to platforms transforming disbursements and spend management. Companies like Mercury, Flex, and Novo rely on Lithic's developer-friendly APIs, direct network connections, and flawless reconciliation to launch and scale card programs in weeks, not years.</p> <p>We're building a future where access to better financial products materially improves people's lives, free from the constraints of 30-year-old mainframes and legacy processors. We're proud to be backed by world-class investors who share that vision, including Bessemer Venture Partners, Index Ventures, Spark Capital, Stripes, and Mastercard, along with many others.&nbsp;</p> <p>We're a team of 170+ across 26 states and 7 countries, headquartered in New York City.&nbsp;</p></div><p>We are hiring a <strong>Senior Software Engineer</strong> for Lithic’s Card Authorization team, which owns the real-time systems that make every card authorization decision correct, reliable, and fast. The team also owns related fraud tooling, including Lithic’s Rules Engine and 3D Secure integration. You’ll own high-impact projects end-to-end, solve distributed-systems problems at scale, and help build the tools customers use to control fraud and payment risk.</p> <h3><strong>Job responsibilities:</strong></h3> <ul> <li>Write reliable, secure, scalable code for Lithic’s real-time authorization and fraud-prevention systems with minimal tech debt</li> <li>Build customer-facing features, such as rules improvements, velocity controls, 3DS flows, fraud tooling, and transaction monitoring. Own projects from planning to launch.</li> <li>Improve the reliability of systems in team’s scope and participate in the team on-call rotation</li> <li>Lead efforts to improve systems and processes within the team</li> </ul> <h3><strong>Qualifications:</strong></h3> <ul> <li>4+ years building production backend systems. Full stack experience is a plus.</li> <li>Experience in or desire to learn Rust; ability to understand Lithic’s system written in other programming languages (Python, Java)</li> <li>Interest and experience in leveraging AI tools to enhance productivity</li> <li>Ability to navigate ambiguity, align diverse perspectives, and drive toward practical solutions</li> <li>Experience or interest in payments, fintech, fraud prevention.</li> <li>Comfort with designing systems from scratch and owning the product development process end-to-end</li> <li>Strong written communication skills and experience working in a remote, async-first team that’s spread across time zones</li> </ul> <p>The annual US salary range for this role is $160,000 to $200,000 plus equity. This salary range may be inclusive of several career levels at Lithic and will be narrowed during the interview process based on the candidate’s experience and qualifications.&nbsp;</p> <p>This is a remote position. However, candidates must be located in the United States, Canada (Ontario or British Columbia), Netherlands, Poland, or Czech Republic. We do not offer visa sponsorship or assistance.</p> <p><strong>Crack the code</strong></p> <p>A hidden code is tucked into this application. Find it and enter it below to continue.</p> <div id="message-list_1774282931.635939"> <div> <div> <div> <div> <div> <div> <div> <div> <div> <div> <div>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</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div><div class="content-conclusion"><h3>Benefits for Full-Time US Employees:</h3> <ul> <li>Unlimited PTO</li> <li>12-weeks fully paid parental leave</li> <li>4-Week Fully Paid Sabbatical (earned at your 5-year anniversary)</li> **<li>Work From Anywhere:** work from anywhere in the world 4-weeks each year</li> <li>3% cashback on card purchases with your complimentary <a href="http://Privacy.com">Privacy.com</a> employee account</li> <li>Health, vision, and dental insurance; HSA Contribution Match</li> <li>401(k) match</li> <li>Voluntary Life Insurance and STD/LTD</li> </ul> <p data-pm-slice="0 0 []">NYC-based employees work from our SoHo office three days a week. Tuesdays and Thursdays are our core days, and you'll choose a third day that works for your schedule and team needs.</p> <p>In-office employees receive:&nbsp;</p> <ul> <li>Commuter benefit</li> <li>Catered lunch every Tuesday and Thursday</li> </ul></div>