Senior Software Engineer (Full Stack - C# & Vue.js)

Senior Software Engineer (Full Stack - C# & Vue.js) Want to work somewhere that's fully committed to giving you cutting-edge AI tools and infrastructure to do your best work? Do you want to ship features at 10x the pace - not by cutting corners, but because your environment is purpose-built to make that possible? If yes, keep reading. We're looking for a Senior Software Engineer to join our Accounts Payable (AP) group and own mission-critical domains powering high-scale financial workflows. You'll work inside an AI-native feature factory, real infrastructure, real tooling, and a team that treats AI as a core part of how software gets designed, built, tested, and shipped. You'll design and evolve scalable systems for invoice processing and bill lifecycle management, applying spec-driven design, SOLID principles, proven design patterns, and strong automated-testing standards, and you'll help set the bar for what AI-augmented engineering looks like at scale. We're looking for a collaborative team player with strong ownership and a proactive, innovative mindset, someone who challenges the status quo, drives work to a complete and deterministic finish, and is genuinely excited about what AI-augmented engineering unlocks. In this role, you will: Design and build scalable, high-performance microservices in a complex, high-volume financial production environment Own critical components end-to-end and architect systems that perform under load and support future scale Lead technical design discussions and influence architectural decisions Drive spec-driven development with SOLID principles and proven design patterns Write clean, maintainable, testable code with strong emphasis on unit and integration testing Improve production quality, observability, and reliability standards Collaborate closely with Product, Architects, DevOps, and cross-functional teams Lead and mentor engineers, setting high engineering standards Push the frontier of AI-assisted development - using AI tools hands-on across design, coding, testing, and review to raise the bar on both speed and quality About you: Active, hands-on user of AI coding tools and AI-driven workflows, with genuine curiosity about pushing them further Strong ownership, finishes what they start, leaves no loose ends Critical thinker who challenges the status quo and brings innovative ideas Proactive self-starter who pursues answers and solutions independently Collaborative across disciplines, unblocking others and sharing knowledge Growth mindset, always learning and sharpening their craft Strong knowledge of OOP design and SOLID principles Good communication skills, team player BSc in computer science or equivalent Backend experience in a major server-side stack (C#, NestJS, ASP.NET, MVC, RDMS and Document DB); frontend familiarity with Vue.js 3, JavaScript, or TypeScript a plus; experience with microservices a plus Why join Lumen Dynamics? Lumen Dynamics is the AI-powered platform for finance automation, elevating how finance teams operate in the global economy. We empower our customers to scale faster and smarter by removing the complexities of doing global business and accelerating their finance operations efficiency. Our platform provides a comprehensive suite of finance automation solutions designed for mid-market businesses across accounts payable, global payouts, procurement, employee expenses, corporate cards, supplier management, tax compliance, and treasury. Lumen Dynamics partners with leading financial institutions such as Citi, Wells Fargo, J.P. Morgan, and Visa, enabling over 5,000 global companies to efficiently and securely pay millions of suppliers and payees across 200+ countries and territories, in 120 currencies. At Lumen Dynamics, we pride ourselves on our collaborative culture, the quality of our product and the capabilities of our people. Lumen Dynamicsans are passionate about the work they do, and keen to get the job done. Lumen Dynamics offers competitive benefits, a flexible workplace, career coaching, and an environment where diverse individuals can thrive and make an impact. Our culture ensures everyone checks their egos at the door and stands ready to reach for success together. Founded in Israel in 2010, Lumen Dynamics is a global business headquartered in the San Francisco Bay Area (Foster City) with offices in Tel Aviv, Plano, Toronto, Vancouver, London, Amsterdam, Tbilisi and Medellin. Our tech teams are the engine behind our business. Lumen Dynamics’s tech ecosystem is extremely rich and we continually add new features to our products, ensuring that we respond to our clients’ needs at scale. Our tech teams retain a fast-paced, start-up vibe that encourages innovation and critical thinking. At Lumen Dynamics, you’ll have the opportunity to work with a diverse, global team of engineers, developers and product leaders who are collectively building the future of our best-in-class product suite as we transform financial operations for the future. About Our Tel Aviv Offices: Hybrid Work Model - 2 days WFH, 3