Senior Software Engineer, Core Identity (Auth0)

The Product

Auth0 is a developer-friendly identity platform that simplifies authentication and authorization for applications.Designed by developers for developers, we make access to applications safe, secure, and seamless for the more than 100 million daily logins around the world. Our modern approach to identity enables this Tier-Ø global service to deliver convenience, privacy, and security so customers can focus on innovation. Know more about our product at https://auth0.com/.

The Core Identity organization

We are hiring for multiple teams within Core Identity, the Engineering organization entrusted with the very heart of the Auth0 application. Our teams own the authentication pipeline, identity protocols, user sessions, and all the fundamental concepts and foundational elements that underpin our entire product. We are also the stewards of the platform's technical health, performance, and efficiency.

Our teams are comprised of engineers with deep expertise in digital identity who are dedicated to designing and operating robust, large-scale systems. The work we do directly impacts millions of users daily and enables other product teams to build innovative features securely and efficiently. We own and operate these mission-critical services at scale while also serving as key partners to other engineering teams across Auth0.

The Role

This is an opportunity to solve complex distributed systems challenges at a global scale. As a Senior Software Engineer in Core Identity, you will design, build, and operate the critical services that form the backbone of our identity platform. You will primarily work with our NodeJS backend (TypeScript/JavaScript), with data stored in MongoDB, PostgreSQL, and Redis, all running on a multi-cloud infrastructure (AWS and Azure). If you have a passion for simplifying complex problems and building resilient, secure software, we encourage you to apply. Experience with or an interest in Identity and Access Management is highly valued.

What you will do:

• Join a fast paced and agile team spread remotely across Central Europe and US or Canada EST.


• Build innovative features and standards that extend the capabilities of Auth0’s platform to help organizations securely innovate around the world.


• Take ownership of the technical quality, security, reliability, and scalability of our systems. You'll drive architectural improvements and advocate for engineering best practices.


• Work in a highly collaborative and cross-functional environment, working with talented engineers and partners across Product, Security, Design, Architecture and QA to deliver features that delight our customers.


• Deepen or gain expertise in identity, security, and modern cloud technologies (AWS, Azure) while working on distributed systems at scale.


• Mentor other engineers and contribute to our culture of technical excellence and continuous improvement.


• Participate in an on-call rotation to ensure our critical services remain healthy and reliable.

What you will bring:

• 4+ years of professional software development experience, or equivalent.


• Proficiency in building backend services with Node.js (JavaScript or TypeScript).


• Experience designing, building, and operating distributed systems in a cloud environment (e.g., AWS, Azure).


• A strong commitment to quality, with experience in various testing strategies (e.g., unit, integration, end-to-end).


• A product-oriented mindset, with the ability to understand customer needs and work collaboratively to find effective solutions.

Nice to have:

• Fluent at using AI tools as part of the Product Development Life Cycle (PDLC)


• Experience in the identity and access management (IAM) domain.


• Knowledge of security engineering principles and application security best practices.


• Experience working effectively in a distributed, remote-first team.

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