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Senior Software Engineer, Card Authorization at Lithic. . Location: Remote. Lithic is the modern card issuing and processing platform empowering ambitious financial companies to build the future of payments.. . 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.. . 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. . . We're a team of 170+ across 26 states and 7 countries, headquartered in New York City. . We are hiring a . Senior Software Engineer. 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.. . Job responsibilities:. . . Write reliable, secure, scalable code for Lithic’s real-time authorization and fraud-prevention systems with minimal tech debt. . Build customer-facing features, such as rules improvements, velocity controls, 3DS flows, fraud tooling, and transaction monitoring. Own projects from planning to launch.. . Improve the reliability of systems in team’s scope and participate in the team on-call rotation. . Lead efforts to improve systems and processes within the team. . . Qualifications:. . . 4+ years building production backend systems. Full stack experience is a plus.. . Experience in or desire to learn Rust; ability to understand Lithic’s system written in other programming languages (Python, Java). . Interest and experience in leveraging AI tools to enhance productivity. . Ability to navigate ambiguity, align diverse perspectives, and drive toward practical solutions. . Experience or interest in payments, fintech, fraud prevention.. . Comfort with designing systems from scratch and owning the product development process end-to-end. . Strong written communication skills and experience working in a remote, async-first team that’s spread across time zones. . . 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. . . 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.. . Crack the code. . A hidden code is tucked into this application. Find it and enter it below to continue.. . . . . . . . . . . . . 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. . . . . . . . . . . . Benefits for Full-Time US Employees:. . . Unlimited PTO. . 12-weeks fully paid parental leave. . 4-Week Fully Paid Sabbatical (earned at your 5-year anniversary). . Work From Anywhere: work from anywhere in the world 4-weeks each year. . 3% cashback on card purchases with your complimentary . Privacy.com. employee account. . Health, vision, and dental insurance; HSA Contribution Match. . 401(k) match. . Voluntary Life Insurance and STD/LTD. . . 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.. . In-office employees receive: . . . Commuter benefit. . Catered lunch every Tuesday and Thursday.