Software Engineer – Security & Infrastructure

The Mobile-First Company; Buenos Aires; Híbrido; ARS 138.487.000 - 230.812.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Competitive salary (USD/local)

Equity

Team retreats

Hubs onboarding trips

Laptop provided

Health insurance

Dynamic team

Descripción de la vacante

The Mobile-First Company is seeking a Senior Security Engineer to own our security and compliance roadmap. You will work with our CTO to define strategy and drive execution across infrastructure and code, protecting a telephony/AI product used by thousands of businesses.

You will secure cloud infrastructure (AWS, Cloudflare), implement IAM and encryption, and integrate security into CI/CD. English proficiency and startup spirit are essential for rapid delivery.

Formación

• 4+ years of experience building and operating backend systems in production with hands-on responsibility for security.
• Experience with authentication/authorization (OAuth, JWT, RBAC) and secure coding practices.
• Security work beyond day job (CTFs, bug bounties, certifications) is a plus.

Responsabilidades

• Own security and compliance roadmap from strategy to execution.
• Lead offensive security track with external partners: scope pentests, triage findings and drive fixes.
• Design, harden and scale backend and cloud infrastructure for products.

Conocimientos

Backend languages

Scalable systems

AI in prod

OAuth/JWT/RBAC

OWASP Top 10

CTFs/bug bounties

AWS

IaC/CD

Monitoring tools

English comms

Educación

CS or related degree

Herramientas

New Relic

Datadog

CI/CD tooling

Descripción del empleo

About The Mobile-First Company

Most 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, Allo, 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 +15 million dolars from Base10, Lightspeed, EMBLEM, and 30+ top operators.
Our team is based in Paris, Buenos Aires, Miami.

What will you do:

• Work side by side with our CTO to own our security and compliance roadmap, from strategy to execution.
• Lead our offensive security track with external partners: scope pentests, triage findings and drive the fixes across infrastructure and code.
• Partner with our Infra & Platform team to design, harden and scale the backend and cloud infrastructure behind our products.

What you’ll be working on

• Securing our cloud infrastructure (e.g., AWS, Supabase, Cloudflare): IAM, networking, encryption, secrets and logging.
• Authentication, authorization and data protection across our apps.
• Building security into our CI/CD: code, dependency and secret scanning that keeps pace with a team that deploys every day.
• Writing the code, automations and tooling that fix vulnerabilities and keep them from coming back.
• Owning our compliance controls (HIPAA, GDPR, SOC 2) and closing the technical gaps.
• Monitoring, alerting and incident response for a real-time telephony and AI product.

What we’re looking for

1. Backend Engineering:

   • Proficiency in backend development with expertise in languages like Kotlin, Java, Go, Python or similar.
   • 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.

2. Security:

   • Hands‑on security work in production: you’ve fixed vulnerabilities, implemented authentication and authorization (OAuth, JWT, RBAC), or worked in a security, fraud or platform team.
   • Strong knowledge of secure coding practices and the OWASP Top 10.
   • Security work beyond your day job (CTFs, bug bounties, certifications, side projects) is a strong plus.

3. Infrastructure:

   • Hands‑on experience with AWS or a similar cloud, networking and production environments.
   • Familiarity with Infrastructure as Code, CI/CD and monitoring tools like New Relic or Datadog.

4. How you think:

   • 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.

5. How you work:

   • 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.

What matters to us

• 4+ years of experience building and operating backend systems in production, with hands‑on responsibility for application or infrastructure security.
• You understand production. You consider reliability, observability and recovery alongside security, especially when changes affect live customer calls.You’re proactive, autonomous, and know how to fill the gaps
• You prioritize by real-world risk. You can explain what needs fixing today, what can wait, and why, in terms of our users, their data and our business.
• 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.
• You’ve worked in product companies

What we offer

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