Staff Software Engineer

Who we are At Fluxon, we believe that how you build matters as much as what you build. We help businesses navigate their most important technology decisions with confidence, and take responsibility for seeing them through. Founded by ex-Googlers and startup veterans, we’re proud to partner with teams behind some of the most ambitious products, including Google, OpenAI, Anthropic, Walmart and Stripe. Our work spans strategy, design, and engineering — often in complex, AI-driven environments — where clarity, speed and quality are the standard. We use AI intentionally, applying it only where it adds real value and expands what’s possible. Care shapes everything we do. Inside Fluxon, you’ll find a global, remote-first team of experienced builders, who are curious, kind and serious about their craft. We’re building a place where people can take ownership, solve problems that matter and do work they’re proud to stand behind. If you want to do your best work alongside people who care as much as you do, you’ll feel at home here. This role is fully remote, with candidates based in Buenos Aires, Argentina. About the role As a Staff Software Engineer at Fluxon, you’ll play a key role in shaping the technical direction of our engineering organization. This is a highly senior, hands-on leadership position where you’ll partner closely with company and engineering leadership to influence strategy, guide architectural decisions, and elevate our overall engineering practice. All Staff Engineers write production code, and everyone joins Fluxon as an individual contributor before stepping into project leadership or management. You'll be responsible for: Guiding product delivery all the way to the user, leading projects, providing technical guidance, and building and iterating in a dynamic environment Partnering directly with clients to understand their needs and achieve business goals Defining product requirements, identifying appropriate system designs and planning development in partnership with our Product and Design teams Helping drive a healthy and effective engineering culture within customer teams and inside Fluxon Mentoring engineers across multiple teams, supporting their ongoing growth and strengthening team capabilities You'll work with a diversity of technologies, including: Core Languages & Runtimes Primary Languages: TypeScript/JavaScript, Python, Golang (Go), Java, C# (.NET), Kotlin, Swift, Rust Additional: Ruby on Rails, Java, C# (.NET), Kotlin, Swift, Rust Frameworks & Ecosystems Front-End & UI: React, Next.js (Full-Stack), Angular, SwiftUI Back-End & Server-Side: Spring Boot (Java/Kotlin), FastAPI (Python), Django (Python) Mobile Development: Expo (React Native) Cloud & Infrastructure Platforms: Google Cloud Platform (GCP), Amazon Web Services (AWS), Microsoft Azure Compute: GCP Compute Engine (VMs), AWS Fargate (Container Orchestration), Google Cloud Run (Serverless Containers), AWS Amplify …