Senior Software Engineer - AI-Powered Expense Platform

Navan; Greater London; On-site; GBP 110,000 - 170,000; Full time

Benefits offered by this job

In-office meals and happy hours

Equity plan participation

Flexible time off

Retirement savings program

Job summary

Navan is expanding Expense engineering in Berlin and London. You will own the expense lifecycle from employee to finance admin, shipping features in backend services and AI-enabled workflows. You will improve extraction, policy, and automation within a scalable, privacy-conscious platform.

You will work across employee experience, international spend, and admin controls, with a focus on reliability, auditability, and safe AI usage in a fast-growing global product.

Qualifications

• 5+ years building production software (8+ for Staff).
• Depth in at least one: Java/Spring Boot, modern TypeScript, or Python services.
• Experience with relational data modeling, APIs, and cloud (AWS).
• Shipped AI in a real product: LLM APIs, tool calling, retrieval-augmented generation, or document extraction.
• Comfort with financial or workflow-heavy domains: expenses, payments, ERP, tax.

Responsibilities

• Design and ship features in backend services (Java/Spring Boot) and/or web (TypeScript).
• Own APIs and event-driven flows that move money, receipts, and policy decisions at scale.
• Build or extend LLM-backed agents: tool use, grounding, streaming, retrieval, and evals.
• Improve document extraction and auto-itemization: quality, latency, cost, and provider failover.
• Instrument production: observability, dashboards, chat satisfaction, extraction accuracy.

Skills

Java/Spring Boot

TypeScript

Python services

AWS

Relational data modeling

APIs

LLM APIs / AI in prod

Code reviews & CI/CD

Financial domain knowledge

Messaging systems (Kafka)

Tools

Git

CI/CD tooling

Observability tools

Job description

Navan is expanding Expense engineering in Berlin and London. You will own the expense lifecycle from employee to finance admin, shipping features in backend services and AI-enabled workflows. You will improve extraction, policy, and automation within a scalable, privacy-conscious platform.

You will work across employee experience, international spend, and admin controls, with a focus on reliability, auditability, and safe AI usage in a fast-growing global product.