Job Description

As a Senior Software Engineer on our newly formed Supplier Portal team, you’ll play a critical role in building Navan’s first Supplier Portal from 0 to 1. Your mission is to architect and develop a robust, secure, and intuitive self-service platform that empowers our travel suppliers to manage and grow their partnerships with Navan.

This is a unique opportunity to build a foundational, high-impact product from the ground up. You will tackle complex technical challenges involving data models, permissions, integrations, and API design, building a durable supply-side platform that improves partner outcomes and strengthens our two-sided marketplace. You’ll collaborate closely with our product managers, designers, and commercial teams across the globe to deliver a platform that works seamlessly across diverse supplier segments.

What You'll Do

• Build from 0 to 1: Drive the development and contribute to the technical design and architecture of the new Supplier Portal, building foundational core services and scalable features from scratch.
• Solve Complex Problems: Apply deep technical expertise to address large-scale engineering challenges, specifically focusing on complex data models, secure permissioning systems, and seamless partner API integrations.
• Deliver Partner-Facing Solutions: Take end-to-end ownership of features - from initial technical design and development to deployment and post-launch operational support - ensuring an exceptional, frictionless experience for our suppliers.
• Collaborate Across Teams: Work closely as part of a global, cross-functional team, partnering with fellow engineers, product managers, designers, and commercial stakeholders to translate supplier needs into scalable technical solutions.
• Contribute to Engineering Culture: Champion best practices in code quality, system architecture, documentation, monitoring, and testing to establish a strong technical foundation for this new team.
• Learn and Grow: Stay engaged with new technologies and industry trends, bringing a growth mindset and a passion for navigating ambiguity to deliver elegant solutions.

What We're Looking For

• 4+ years of experience building and scaling complex backend systems in fast-paced, high-growth, or large-scale environments (open to exceptional candidates with less experience).
• 0-to-1 & B2B Experience: Hands-on experience developing and maintaining core business platforms, partner-facing tools, or B2B products. Experience building supply-side tooling for a two-sided marketplace is highly valued.
• Technical Proficiency: Strong proficiency in Java and Spring Boot, with a solid understanding of JVM performance and optimization.
• Architecture & Cloud: Deep experience with distributed systems, microservices, and robust API design, including practical expertise with AWS or other cloud platforms.
• Security & Data Modeling: Ability to reason about and design secure integrations, complex permission models, and scalable data architectures.
• Ownership Mentality: A strong track record of delivering production-quality, maintainable code, and supporting features post-release through active monitoring and troubleshooting.
• Collaboration: A collaborative team player with excellent communication skills, able to explain complex technical concepts to both engineering peers and non-technical stakeholders.
• Domain Knowledge: Experience in travel technology (flights, hotels, inventory management, or partner APIs) is a strong plus.
• Education: Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field, or equivalent hands-on experience.