Lead Full Stack Engineer - Users & Auth (Ingeniero/a Lead Full Stack - Usuarios y Autenticación) - Hybrid

Ready to accelerate your career?

Clara is the fastest-growing company in Latin America. We've built the leading solution for companies to make and manage all their payments. We already help over 20,000 large and growing businesses operate with agility and financial clarity through locally issued corporate cards, bill pay, financing, and a powerful B2B platform built for scale.

Clara is backed by some of the most successful investors in the world, including top regional VCs like monashees, Kaszek, and Canary, and leading global funds like Notable Capital, Coatue, DST Global Partners, ICONIQ Growth, General Catalyst, Citi Ventures, SV Angel, Citius, Endeavor Catalyst, and Goldman Sachs - in addition to dozens of angel investors and local family offices.

We’re building the financial infrastructure that powers high-performing organizations across the region. We invite you to join us if you want to be part of a fast-paced environment that will accelerate your career and support you to do some of the best work of your life alongside a passionate and committed team distributed across the Americas.

Lead Full Stack Engineer — Users & Auth

We're looking for a Lead Full Stack Engineer to own 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 end-to-end: 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. 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

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


• Leading a multidisciplinary team — sprint planning, standups, retros


• Elevating the team through pairing, mentorship, and sharing what you know


• Setting and holding the quality bar — through code reviews, design reviews, and your own work


• Reviewing product specs from the technical lens — flagging feasibility gaps and spotting where AI tooling can close work that would otherwise take months

Who you are

• 5+ years of software engineering experience with solid execution in production environments


• 2+ years of hands-on experience implementing authentication and authorization with Auth0 or comparable identity platforms


• Strong in Java and Spring on the backend, with solid frontend experience — React preferred


• Solid understanding of security best practices for web applications and secure software design in distributed architectures


• A technical product mindset grounded in security — you know how to balance velocity with the constraints of owning critical systems


• 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, with the ability to lead technical discussions 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 join Clara

At Clara, you’ll have the autonomy, speed, and support to make meaningful impact — not just on your team, but on how organizations are run across Latin America.

Who we are

• We’re the leading B2B fintech for spend management in Latin America.


• Certified as one of the world's fastest-growing companies, a Great Place to Work , and a LinkedIn Top Startup .


• Passionate about making Latin America more prosperous and competitive.


• Constantly innovating to build financial infrastructure that enables each of our customers to thrive.


• Product-led, high-talent-density culture — designed for builders who raise the bar.


• Proud of our open, inclusive, and values-driven environment.

What we believe in

• #Clarity. We say things clearly, directly, and proactively.


• #Simplicity. We reduce noise to focus on what really matters.


• #Ownership. We take responsibility and never wait to be told.


• #Pride. We build products and experiences we’re proud of.


• #Always Be Changing (ABC). We grow through feedback, risk-taking, and action.


• #Inclusivity. Every voice counts. Everyone contributes to our mission.

What we offer

• Competitive salary and stock options (ESOP ) from day one


• Multicultural team with daily exposure to Portuguese, Spanish, and English (our corporate language)


• Annual learning budget and internal accelerated development paths


• High-ownership environment: we move fast, learn fast, and raise the bar — together


• Smart, ambitious teammates — low ego, high impact


• Flexible vacation and hybrid work model focused on results

Clara’s Hybrid Policy

Claridians in a hybrid mode split their time between working from the office, talking to or visiting customers, or working from home. This hits a balance between bringing people together for in-person collaboration and learning from each other, while supporting flexibility about how to do this in a way that makes sense for each individual and team.

We don't enforce a minimum number of days for most roles, but you're expected to spend time at the office organically, and be at the office most days during your ramp-up or when required by your leader.