Senior Backend Engineer

The Mobile-First Company

Senior Backend Engineer driving backend technology evolution for mobile-first software company. Collaborating with CTO to build scalable AI-integrated backend systems for diverse applications.

Posted 5/22/2026full-timeBuenos Aires • 🇦🇷 ArgentinaSeniorWebsite

Tech Stack

Tools & technologies

AWSCloudGoJavaKotlinPython

About the role

Key responsibilities & impact

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 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.
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.

Requirements

What you’ll need

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.
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.
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
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.
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.
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.

Benefits

Comp & perks

Competitive salary (in USD or local equivalent)
Equity package
10-day team retreats abroad every semester
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

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

backend developmentKotlinJavaGoPythondatabase designscalable systemsAI optimizationarchitectural patternsCI/CD processes

Soft Skills

communicationfeedbackownershipproactivityautonomyuser value focusbusiness impact awarenessquestioningteam collaborationadaptability