Senior Auth Engineer — Users & Auth

Description

Clara is the leading spend management platform in Latin America. More than 40,000 businesses run on our corporate cards, bill pay, financing and B2B payments, and in 2025 the Financial Times named Clara the fastest-growing company in Latin America. We're ~400 people, backed by Kaszek, monashees, Coatue, DST Global, ICONIQ, General Catalyst and Goldman Sachs, among others.

Auth Engineer — Users & Auth

We're looking for an Auth Engineer to own, architect, and build the systems that define how users exist and move within Clara's platform — authentication, authorization, identity, and access control. This is one of those roles where the work is invisible when it's done right and critical when it's not. The scope is deep and end-to-end: architecting the identity layer, designing auth flows, managing the user lifecycle, integrating Auth0 with Clara's platform, and making sure the frontend and backend sides of identity speak the same language. You'll be the person the rest of engineering turns to when there's an auth question no one else can answer. Security isn't a checklist here — it's a first-class concern baked into how we build.

We move fast and trust our engineers to own outcomes end-to-end. That means autonomy to make decisions, proactivity to surface problems before they become blockers, and the attitude to push initiatives across the finish line without waiting to be told what to do.

Your responsibilities will include:

Designing and building the identity and access layer that Clara's apps rely on across products — making it work end-to-end and hold up as the platform grows, in close partnership with the team's tech lead

Owning auth end-to-end: architecture, implementation, and Auth0 integration across frontend and backend

Designing and hardening auth flows and the full user lifecycle

Being a strong reference on identity and access for the rest of engineering — a go-to for the hard auth problems that block other teams

Setting and holding the security and quality bar on identity-critical paths through code reviews and design reviews

Partnering with the team's tech lead and with product on the feasibility of auth-heavy initiatives, and spotting where AI tooling can close work that would otherwise take months

Requirements

• 4+ years of software engineering experience with solid execution in production environments
• 2+ years of hands-on experience implementing authentication and authorization on a modern identity platform — experience with Auth0 specifically is preferred, comparable platforms is also welcome; IAM depth is a strong plus
• Full-stack engineering with your strength on the backend. We work primarily in Java and Spring on the backend and React on the frontend — depth in those is a plus, but we care more about strong fundamentals and how fast you ramp than about years in any one stack
• Deep understanding of security best practices for web applications and secure software design in distributed architectures
• High autonomy, proactivity, and ownership mindset. You don't wait for direction — you spot what needs to happen and drive it
• A genuine pull toward AI. You don't need to be an expert, but you're actively experimenting with AI tools in your day-to-day work, keep up with where the space is going, and are eager to apply it to how we build. At Clara, AI is part of how we work, not a side topic
• English proficiency, comfortable communicating and collaborating on technical topics across geographies
• We've kept this list short on purpose — these are the things that actually matter. If you check most of these and the rest you'd close with curiosity and the right tools, we want to hear from you.
• Why Clara
• A high talent-density team driven to make an impact in Latin America — low ego, high ownership.
• Competitive salary and stock options (ESOP) from day one.
• An annual learning budget and accelerated development paths.
• English is our working language, with Spanish and Portuguese every day.

Conditions

Clarity — Open and direct communication: we say what we mean and give context where it matters.

Simplicity — If it can be simpler, it should be.

Ownership — We own everything we do, end to end. When something needs to happen, we don't wait.

Pride — We hold ourselves to a high standard, and it shows in what we deliver.

ABC (Always Be Changing) — We adapt fast, embrace change, and keep learning.

Inclusivity — Diverse ideas, stories and perspectives build a better Clara.

Hybrid at Clara

Claridians split their time between the office, customers and home. We don't set a minimum number of office days for most roles, but we expect you to spend time there naturally, and most days during your ramp-up or when your leader asks.

If you meet the must-haves, apply — the nice-to-haves are a bonus, not a requirement.