Senior Fullstack Engineer

Navan has transformed the corporate travel, payment, and expense landscape by consistently prioritizing user needs. As a Senior Full Stack Engineer on the Enterprise Team, you will be a technical leader helping to build the "operating system" of our corporate travel platform. Our team owns the critical infrastructure that allows companies to function globally-managing everything from granular travel policies and dynamic approval workflows to user identity and enterprise-grade analytics.

This is a high-impact role where you will bridge the gap between complex backend logic and intuitive user experiences. You will collaborate closely with a talented team of engineers, product managers, and designers to build sophisticated configuration tools, real-time dashboards, and seamless integration flows that empower our customers to manage their travel programs at scale.

What You'll Do:

• Design, Build, and Evolve: Architect and develop end-to-end features across the stack. You will evolve the robust Java/Spring Boot backend services that power our platform, while building the responsive frontend interfaces for our Admin and User portals.
• Build Enterprise-Grade Workflows: Create powerful backend engines and supporting UIs for complex business domains, such as configuring travel policies, visualizing approval chains, and managing user roles/permissions.
• Build Data-Driven Services: Architect and scale APIs and data services that manage high volumes of data, ensure transactional integrity, and power reporting features and seamless integrations.
• Own Features End-to-End: Take technical ownership of a problem domain, facilitating the design, development, and launch of key microservices and features that have a direct impact on our users.
• Collaborate Across Teams: Work cross-functionally with various engineering, product, and design teams to deliver complex, cross-domain features in a collaborative environment.
• Drive the Vision: Partner with engineering and product leadership to identify, plan, and execute the long-term technical vision for your domain and be a subject matter expert.
• Champion Best Practices: Contribute to a culture of technical excellence by writing high-quality, well-tested code, mentoring other engineers, and advocating for best practices in testing, monitoring, and operational reliability.

What We're Looking For:

• 4-6 years of experience in software development, building complex systems for SaaS products or consumer-facing web applications in a fast-paced environment.
• Backend Expertise: Deep, hands-on experience in backend development using Java and Spring Boot. You should be highly skilled in data modeling, query optimization, and designing secure, scalable APIs to support enterprise-level features.
• Frontend Proficiency: Solid experience with frontend development (4+ years) using modern frameworks like React, Angular, or Vue, along with proficiency in TypeScript and managing application state.
• Systems Architecture: Extensive experience designing and implementing scalable applications across microservices, distributed systems, and cloud platforms like AWS.
• Collaborative Ownership: Demonstrates strong ownership and a collaborative mindset, with clear communication skills and a proven ability to ship production-quality code equipped with robust monitoring and documentation.
• AI-Enabled Workflow: Ability to effectively leverage AI development tools (such as GitHub Copilot, CodeGPT, Claude, and Cursor) to accelerate development and innovate on engineering workflows.
• Bachelor's or Master's degree in Computer Science, Engineering, or a related field-or equivalent hands-on experience.

Nice to Have:

• AI and LLM Integration: Hands-on experience building AI Agents or implementing Retrieval-Augmented Generation (RAG) patterns using orchestration frameworks like LangChain or LlamaIndex.
• Vector Infrastructure: Familiarity with vector databases (e.g., Pinecone, Weaviate, or pgvector) and experience fine-tuning prompts or managing LLM-powered services within a Java-based microservices architecture.