Senior AI Engineer 🇦🇷

About The Mobile-First CompanyMost 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, 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 +5 million dolars from Lightspeed, EMBLEM, and 30+ top operators.Our team is based in Paris, Buenos Aires, Miami.Drive the evolution of our backend technology, infrastructure, and AI capabilities to ensure high performance, scalability, and seamless integration for our mobile applications.What will you do:Work side by side with our CTO to build the foundations, the present, and the future of our AI capabilities. Design and implement systems powered by LLMs that translate directly into user value. Integrate these AI services with our current backend infrastructure. Instrument, observe, and optimize AI systems with robust evaluation frameworks. What you’ll be working onImplementing and maintaining scalable and reliable AI systems using languages like Python, Kotlin, JS or similar. Prompt engineering, vector embeddings and evaluation tools. Data modeling and management to optimize the performance and intelligence of our apps. Working directly with Cloud services (e.g., AWS, Supabase, Cloudflare). What we’re looking forBackend AI Engineering:Proficiency in backend development with expertise in languages like Python, Kotlin, JS or similar. Proven delivery of LLM features with LangChain or similar (prompt design, RAG, caching, fine-tuning). Strong system design, performance tuning, and data-modeling skills. Systems Architecture:Expertise in designing scalable and maintainable backend architectures, understanding when to apply different architectural patterns. Ability to instrument, monitor, and troubleshoot AI workloads end-to-end Performance and dataYou know how to build scalable and maintainable codeYou care about what to measure and how it impacts business and usersYou track behavior, usage, and performance, and improve based on itHow you thinkYou 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 workYou 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 usYou’ve worked in product companies. Proven delivery and great understanding of LLM features in production. 4+ years of experience designing and building high-performance systems used by millions. You’re proactive, autonomous, and know how to fill the gaps. You can communicate in English, since that's our official language. Most of the team also speaks Spanish and French. What we offerCompetitive salary (in USD or local equivalent)Equity package10-day team retreats abroad every quarter30-day onboarding in Paris (we cover flights and housing)Laptop and work setup of your choicePrivate health insurance (for US or LATAM hires)A tight, ambitious team building something real — fastHow To ApplyClick 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.We welcome people from all backgrounds.If you’re part of an underrepresented group in tech, we especially want to hear from you.