Senior Backend Engineer

Overview Senior Backend Engineer role at The Mobile-First Company. We build mobile-first business software that feels like a consumer app, runs on AI, and spreads like a creator brand. Our team is based in Paris, Buenos Aires, Miami. We are looking to drive the evolution of our backend technology, infrastructure, and AI capabilities to ensure high performance, scalability, and seamless integration for our mobile applications. What you will do Drive the evolution of our backend technology, infrastructure, and AI capabilities to ensure high performance, scalability, and seamless integration for our mobile applications. Work side by side with the CTO to build the foundations, the present, and the future of our backend, and AI systems. Develop and enhance backend systems for both existing and new applications in conjunction with mobile engineers. Contribute to systems design, infrastructure planning, CI/CD processes, and data workflows. Implementing and maintaining scalable and reliable backend systems using languages like Kotlin, Java, Go, Python or similar. Designing and defining backend tools, databases, and the architecture of our apps. Working directly with Cloud services (e.g., AWS, Supabase, Cloudflare). Creating tools, libraries, or components to enhance the efficiency of backend development processes. Qualifications Backend Engineering: Proficiency in backend development with expertise in languages like Kotlin, Java, Go, Python or similar. Familiarity with database design, management, and optimization. Track record of building and maintaining scalable and reliable backend systems. Experience with AI is a strong plus, especially in applying models to real-world product use cases and optimizing performance in production environments. Systems Architecture: Expertise in designing scalable and maintainable backend architectures, understanding when to apply different architectural patterns. Capable of monitoring the whole architecture using tools like New Relic or Datadog. Performance and data: You know how to build scalable and maintainable code. You care about what to measure and how it impacts business and users. You track behavior, usage, and performance, and improve based on it. How you think and how you work: You care about why we build things, not just how. You think in terms of user value and business impact. You communicate clearly, give feedback with no ego, and help others grow. You move fast, take ownership, and thrive in ambiguity. You are comfortable working in English — and in a small team with big goals. Experience: 4+ years of experience designing and building high-performance systems used by millions. Proactive, autonomous, and able to fill gaps. Strong English communication skills; team languages include Spanish and French. What matters to us You’ve worked in product companies. Salary and equity expectations align with a high-growth environment. We value initiative, autonomy, and the ability to operate in ambiguity. What we offer Competitive salary (in USD or local equivalent) Equity package 10-day team retreats abroad every quarter 30-day onboarding in Paris (we cover flights and housing) Laptop and work setup of your choice 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. EEO and inclusivity If you’re part of an underrepresented group in tech, we especially want to hear from you. Referrals increase your chances of interviewing. Get notified about new Backend Engineer jobs in Pilar, Buenos Aires Province, Argentina. #J-18808-Ljbffr