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Staff Software Engineer en Barcelona

Supersonik

Categoría
Programador Backend
Industria
Industria AI
Lugar de trabajo
En sede
Horas
Full-Time
Prácticas
false
Habilidades
Terraform Redis Python PostgreSQL FastAPI Asyncio Amazon Web Services (AWS)
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Descripción de la oferta

🚀 About Supersonik

Supersonik helps B2B SaaS companies sell faster with AI-powered product demos. On a live video call, our AI Agent shares the screen to walk buyers through a personalized, interactive demo in any language. This lets teams skip long sales calls and focus on closing deals.
We’re backed by Andreessen Horowitz (a16z) and work with leading SaaS companies worldwide.


🧩 About the Role

We’re hiring Staff Engineers (10+ years of experience) to join our core team in Barcelona.

You’ll be solving complex, technical problems and shaping the product and architecture from day one. You should thrive in high-growth startup environments, be fluent in modern Python and async programming and know how to build scalable, event-driven systems. You care about fast, real-time systems and enjoy working at the intersection of performance, AI and great user experience.
If you love solving first-principles problems, navigating ambiguity and want to build a product people love you’ll fit right in.


What You’ll Work On

  • Scale a real-time, event-driven backend architecture where milliseconds matter
  • Design and implement low-latency APIs using FastAPI and Asyncio
  • Solve engineering challenges in performance optimization, observability, and resilience
  • End to end contributions from frontend to infrastructure.
  • Collaborate on prompt engineering, LLM behaviors, LLM fine-tuning and UX
  • Build and maintain infrastructure-as-code with Terraform and AWS
  • Contribute to 0→1 product development with a small, fast-moving team

Our Stack

  • Backend: Python, FastAPI, Asyncio, Redis, PostgreSQL
  • Infra: AWS, Terraform, CI/CD
  • Frontend: React
  • Tooling: GitHub, Datadog, Linear


Bonus Points

  • Experience with LLMs (prompting, training, alignment)
  • Experience with TTS, STT and real-time voice
  • Experience with browser automations
  • Deep knowledge of AWS, Terraform, and distributed systems
  • Experience shipping 0→1 products in a startup


What You’ll Get

  • Above-average salary
  • Significant equity in a company backed by A16z
  • Full ownership, real impact, and fast learning cycles
  • A tight-knit team that values clarity, speed, and smart execution
 

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Acerca de Supersonik

  • Ai

  • Barcelona, Spain

  • 2-10

  • 2024

Supersonik is reshaping how B2B SaaS companies sell their software.

Our AI Agents deliver instant, personalized, interactive, and multi-language product demos at scale, combining the discovery, qualification, and demonstration steps for a faster sales cycle and increased revenue. We’re replacing outdated sales cycles with smart, dynamic AI-driven experiences, and we’re just getting started.

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