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Urgent! Senior Backend Engineer Position in Rincón de los Sauces - The Mobile-First Company

Senior Backend Engineer



Job description

Overview

The Mobile-First Company is hiring a Senior Backend Engineer .

This role focuses on driving the evolution of our backend technology, infrastructure, and AI capabilities to ensure high performance, scalability, and seamless integration for our mobile applications.

What you'll do

  • Work side by side with our 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.

  • Design backend tools, databases, and the architecture of our apps.

  • Work directly with Cloud services (e.g., AWS, Supabase, Cloudflare).

  • Creating tools, libraries, or components to enhance the efficiency of backend development processes.

What we're looking for

  • Backend Engineering: Proficiency 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; able to monitor 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: You care about why we build things, ask smart questions, 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, help others grow; you move fast, take ownership, and thrive in ambiguity.

  • Language: You're comfortable working in English — and in a small team with big goals.

What matters to us

  • You have 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 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.

If you’re not the perfect match but want to join us, send a spontaneous application to the address provided.

We welcome people from all backgrounds, and especially want to hear from underrepresented groups in tech.

Seniority level: Mid-Senior level | Employment type: Full-time | Job function: Engineering and Information Technology | Industries: Mobile Computing Software Products

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