Software Engineer - B2B Lending & Payments

Job Title: Software Engineer - B2B Lending & Payments Type: Full-time Location: Paris What about us? Launched in 2023, INFINIT is a fast-growing fintech scale-up operating in multiple countries across Europe and Americas. At INFINIT we are on a mission to reshape the future of SMEs with AI at the forefront. Our all-in-one operating system has banking at its core, and empowers small business owners and their teams to seamlessly manage and optimize every aspect of their business with AI agents. By focussing on specific industries, INFINIT delivers tailored, high-value solutions, while building innovative AI products to further unlock significant growth opportunities for our customers. INFINIT operates globally, with ambitions to further expand its footprint to redefine the fintech landscape for SMEs worldwide. Join us on the INFINIT journey as we revolutionise the SME economy and drive meaningful impact through innovation 🚀 The Role We are hiring a Software Engineer (B2B Lending & Payments) to take ownership of the financial infrastructure that powers how our clients finance their assets through INFINIT. We believe the most resilient lending and payment systems are built by engineers who operate at the intersection of deep technical mastery, genuine product judgment, and direct proximity to the client’s financing workflow. This is not a ticket-execution role. You will work with business stakeholders and clients to understand why a problem matters before deciding what to build then use agentic coding to ship the how fast and well. Partnering with other engineers owning this domain, you will own two deeply connected responsibilities. First, crafting the best possible experience for a client going through a loan application, from the moment they submit a request to the moment financing is confirmed, every step should feel clear, fast, and trustworthy. Second, ensuring that every payment executed throughout the loan lifecycle (interest accruals, supplier disbursements, reimbursement) is processed correctly, securely, and without exception. Third, supporting the physical audit and due diligence workflows that allow us to maintain control over the collateral throughout the life of the loan. You will be the person the rest of the team pings when something in this domain breaks. What do you need to be successful in this role? • Expert C# & .NET Engineering, mastery of the .NET ecosystem with a focus on building high-performance, distributed backend systems. You have a proven track record of shipping scalable, production-grade architectures where technical clarity and long-term maintainability are the default. • Core banking & ledger logic , a strong professional background in regulated financial environments. You understand the mechanics of ledgers, loan origination, and payment execution and the cost of getting any of it wrong. • Mission-critical ownership: Demonstrated ability to own features end-to-end. You don't just "write code"; you analyze customer financing workflows, define rigorous technical requirements, and take full accountability for the reliability of every transaction you process. • Highly effective stakeholder communication , capable of seamlessly translating deep technical concepts for non-technical stakeholders (customers, product managers) and clearly translating business objectives into prioritized engineering tasks. • Practical experience leveraging modern developer tools (such as agentic coding or advanced automation techniques) to achieve significantly accelerated development velocity while rigorously upholding code quality standards. What will you find working at INFINIT? • Competitive Salary and Equity : We offer highly competitive salaries and a stake in our success with share options because