Job DescriptionMonto is looking for a Principal Software Engineer (Full Stack) to join our engineering team. We are building the next generation of our platform and investing heavily in scalability, reliability, automation, and AI as we grow toward processing millions of transactions per day. This is a hands-on role for experienced full-stack engineers who combine strong technical leadership with a passion for building scalable systems. While much of the work focuses on backend architecture and distributed systems, you should be comfortable contributing across the entire stack. What You’ll Do:- Design and build end-to-end systems across backend and frontend- Build and evolve scalable distributed systems that support high-volume transaction processing- Help drive the evolution of our event-driven architecture, improving reliability, performance, and operational efficiency- Improve system scalability, observability, resiliency, and fault tolerance- Work on distributed workflows, asynchronous processing, and large-scale data pipelines- Contribute to architecture discussions, technical design reviews, and engineering best practices- Collaborate closely with engineering, product, customer success, and leadership teams on strategic initiatives- Build and maintain cloud-native infrastructure and deployment workflows- Evaluate and implement AI-powered capabilities, automations, and agent-driven workflows Requirements:- 8+ years of software engineering experience- Strong full-stack capabilities (backend + frontend)- Expert-level Node.js and TypeScript experience- Strong experience with modern frontend frameworks (React preferred)- Proven experience building and scaling production systems- Strong understanding of distributed systems and event-driven architectures- Experience working with AWS and cloud-native systems- Ability to work independently and take full ownership- Strong problem-solving and execution skills Nice-to-Have:- AWS Serverless (Lambda, EventBridge, SQS, Step Functions)- Infrastructure as Code- Integrating AI agents/LLM-powered workflows into production systems- B2B SaaS experience; startup experience Why Join Monto?- Help scale a platform processing millions of transactions- Work with TypeScript, AWS Serverless, event-driven architectures, and AI- Influence key architectural decisions- High ownership and autonomy; solve challenging, real-world problems