Senior Software Engineer

About the Company

Most tools for small businesses were not built for real operators. They were designed for employees working in offices, not for people running a business from their phone.

They are changing that.

They build mobile-first business software that feels like a consumer app, runs on AI, and spreads with the simplicity of modern digital products.

Their first product gives businesses a second number on their phone, answers missed calls with AI, transcribes conversations, and syncs them to their CRM. Over 20,000 businesses use it every day, with new financial and operational tools planned next.

They have raised over $15M and operate with a distributed team across Paris, Buenos Aires, and Miami.

Role Overview

Drive the evolution of their backend technology, infrastructure, and AI capabilities to ensure high performance, scalability, and seamless integration for their mobile applications.

What will you do:

Work side by side with the CTO to build the foundations, the present, and the future of their backend and AI systems.

Develop and enhance backend systems for both existing and new applications in collaboration with mobile engineers.

Contribute to system design, infrastructure planning, CI/CD processes, and data workflows.

What you’ll be working on

Implementing and maintaining scalable and reliable backend systems using languages such as Kotlin, Java, Go, Python, or similar.

Designing backend tools, databases, and application architecture.

Working directly with cloud services such as AWS, Supabase, or Cloudflare.

Building tools, libraries, or components that improve backend development efficiency.

What we’re looking for

Backend Engineering:

Strong backend development experience with languages such as Kotlin, Java, Go, Python, or similar.

Solid understanding of database design, management, and optimization.

Proven experience building and maintaining scalable and reliable backend systems.

Experience with AI is a strong plus, particularly applying models to real product use cases and optimizing them in production environments.

Systems Architecture:

Experience designing scalable and maintainable backend architectures and selecting the right architectural patterns when needed.

Ability to monitor systems and architecture using tools such as 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 both business and users.

You track behavior, usage, and performance, and improve systems based on those insights.

How you think

You care about why things are built, not only how.

You ask thoughtful questions, challenge ideas when needed, and contribute to shaping what comes next.

You think in terms of user value and business impact.

How you work

You communicate clearly, give feedback without ego, and help others grow.

You move quickly, take ownership, and operate comfortably in ambiguous environments.

You are comfortable working in English and collaborating within a small team with ambitious goals.

What matters to us

Experience working in product companies.

4+ years designing and building high-performance systems used at scale.

You are proactive, autonomous, and able to fill gaps when needed.

You can communicate in English, which is the company’s official language. Many team members also speak Spanish and French.

What we offer

Competitive salary (in USD or local equivalent).

Equity package.

10-day team retreats abroad every quarter.

Trips to company hubs for onboarding and collaboration.

Laptop and work setup of your choice.

Coverage for private health insurance (for US or LATAM hires).

A focused, ambitious team building real products quickly.

The role is based in Buenos Aires, with a hybrid schedule of 2–3 days per week in the office. If you're based outside the city, the team covers one monthly trip so you can connect in person.

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