Staff Engineer - Backend & Platform 🇦🇷

ABOUT THE MOBILE-FIRST COMPANY Most tools for small businesses weren’t built for real operators. They were built for employees in offices, not people running a business from their phone. We’re changing that. We build mobile-first business software that feels like a consumer app, runs on AI, and spreads like a creator brand. Our first product, Allô https://www.withallo.com/, gives you a second number on your phone, answers missed calls with AI, transcribes everything, and syncs it to your CRM. Over 20,000 businesses use it every day. Next up: expenses, invoicing, and more. We’ve raised +15 million dolars from Base10, Lightspeed, EMBLEM, and 30+ top operators. Our team is based in Paris, Buenos Aires, Miami. MISSION Drive the evolution of our backend technology, infrastructure, and AI capabilities to ensure high performance, scalability, and seamless integration for our platform. WHAT WILL YOU DO - Work closely with our CTO and engineering team to design and evolve the core backend and platform architecture that powers all our applications. - Mentor and support other engineers. - Lead complex technical initiatives across backend systems, data infrastructure, CI/CD pipelines, and developer tooling. - Define and implement scalable foundations that allow the team to ship faster and operate reliably as we grow. WHAT YOU’LL BE WORKING ON - Designing and evolving the backend architecture that powers our products and internal platform. - Building scalable and reliable services. - Improving infrastructure, observability, reliability, and deployment workflows across the engineering stack. - Working directly with cloud services (e.g., AWS, Supabase, Cloudflare). - Leading technical decisions and helping the team scale operationally. WHAT WE’RE LOOKING FOR BACKEND ENGINEERING - Strong expertise in backend development with languages like Kotlin, Java, Go, Python, or similar. - Proven experience building and operating scalable backend systems in production. - Deep understanding of distributed systems, reliability, and performance optimization. - Experience integrating AI models or AI-powered workflows into real product systems is a strong plus. SYSTEMS ARCHITECTURE - Strong experience designing scalable architectures and making high-impact technical decisions. - Ability to design systems that remain reliable, observable, and maintainable as the company scales. PLATFORM & INFRASTRUCTURE - Experience designing and improving developer platforms, CI/CD pipelines, or internal engineering tooling. - Strong understanding of cloud infrastructure and production environments. - Experience with monitoring and observability tools such as New Relic, Datadog or similar. HOW YOU THINK - You care about why we build things, not just how. - You ask smart questions, challenge ideas when needed, and help shape what’s next. - You think in terms of user value and business impact. HOW YOU WORK - You communicate clearly, give feedback with no ego, and help others grow. - You move fast, take ownership, and thrive in ambiguity. - You're comfortable working in English and in a small team with big goals. WHAT MATTERS TO US - You’ve worked in product companies. - 7+ years of experience building and operating large-scale backend systems. - Experience owning or influencing architecture decisions across teams. - You’re proactive, autonomous, and comfortable operating in early-stage startup environments. - You can communicate in English, since that’s our official language. Most of the team also speaks Spanish and French. WHAT WE OFFER - Competitive salary (in USD or local equivalent) - Equity package - 10-day team retreats abroad every quarter - Trips to our Hubs (Pairs/Miami/BA) for onboarding and more - Laptop and work setup of your choice - Coverage for private health insurance (for US or LATAM hires) - A tight, ambitious team building something real — fast HOW TO APPLY Click the Apply button on this page to send your application. No cover letter needed just tell us who you are and why this role fits you. Not the perfect match, but want to join us? Send a spontaneous application to talent@themobilefirst.co jeremy@themobilefirst.co. We welcome people from all backgrounds. If you’re part of an underrepresented group in tech, we especially want to hear from you.