Senior Backend Engineer - AI-Driven Fintech Platform

01A; Greater London; On-site; GBP 90,000 - 140,000; Full time

Job summary

Navan is seeking a Senior Software Engineer (Backend) to shape the architecture of a next-generation corporate expense management platform. You will scale backend systems powering global commerce, payments, issuing platforms, and accounting integrations.

Ideal candidates bring 4–6 years of building and scaling complex systems in fast-growing environments, strong Java and Spring Boot skills, and a track record of production-ready code.

Qualifications

• 4-6 years of experience building and scaling complex systems in fast-paced, high-growth, or large-scale environments (open to exceptional candidates with less experience).
• Java & Spring Mastery: Proficiency in Java and Spring Boot, with a solid understanding of JVM performance and optimization.
• AI Integration: Proven experience leveraging AI models and AI-driven development to build intelligent, automated features and enhance engineering productivity.
• Systems Architecture: Strong experience with distributed systems, microservices, and API design, including practical expertise with AWS or other cloud platforms.
• Product Experience: Hands-on experience developing and maintaining consumer-facing or core business products at scale.
• Ownership Mentality: A record of delivering production-quality, maintainable code, and supporting features post-release through monitoring and troubleshooting.
• Cross-Functional Collaboration: Collaborative team player able to work effectively with global, cross-functional partners.
• Technical Excellence: Commitment to engineering best practices in testing, documentation, scalability, and code quality, coupled with a passion for tackling technically demanding and customer-impacting challenges.
• Education: Bachelor's or Master's degree in Computer Science, Engineering, or a related field.

Responsibilities

• Build at Scale: Design and develop robust, high-performance features and core services that support the company's flagship product and serve a global customer base.
• Solve Complex Problems: Apply deep technical expertise and creativity to address large-scale engineering challenges, driving improvements in reliability, performance, and user experience.
• Deliver Customer-Facing Solutions: Take end-to-end ownership of features—from design and development to deployment and operational support—ensuring exceptional quality and value for users.
• Collaborate Across Teams: Work effectively as part of a global, cross-functional team, partnering with fellow engineers, product managers, designers, and business leaders to deliver impactful solutions and elevate team performance.
• Contribute to Engineering Culture: Champion best practices in code quality, scalability, documentation, monitoring, and testing, fostering a culture of technical excellence, collaboration, and continuous improvement.
• Learn and Grow: Stay engaged with new technologies and industry trends, bringing a growth mindset and a passion for delivering elegant solutions to complex problems.

Skills

Java & Spring Mastery

AI Integration

Distributed systems

API design

Cloud platforms (AWS)

Cross-functional collaboration

Ownership mindset

Testing & documentation

Education

Bachelor's or Master's in Computer Science, Engineering, or related field

Tools

AWS

Job description

Navan is seeking a Senior Software Engineer (Backend) to shape the architecture of a next-generation corporate expense management platform. You will scale backend systems powering global commerce, payments, issuing platforms, and accounting integrations.

Ideal candidates bring 4–6 years of building and scaling complex systems in fast-growing environments, strong Java and Spring Boot skills, and a track record of production-ready code.