Software Engineer

Barcelona, Spain·Full-time·Added over a year ago

Supersonik AI

5 open roles

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What they offer

Full-time hours
Per the ad.

What they ask for

Have the right to work in Spain
Supersonik AI doesn't mention sponsorship in the ad.
Work in English
English is required, per the ad.
Work on-site in Barcelona
No relocation package mentioned.

This job was published a year ago

The role

🚀 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 Senior Engineers 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

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

About Supersonik AI

Supersonik is an AI software company operating as an applied research lab. It develops AI agents that can understand, operate, and explain real software live, serving use cases across sales, customer success, and enablement. The company reports that its platform has enabled over 250 SDRs, reached more than 80,000 customers, and is live across three regions, with integrations to 500+ systems and 42 workflows.

Supersonik has a presence in Barcelona, Spain, where it is hiring for roles. The company emphasizes applied research and production systems, with a focus on governance, security, and enterprise readiness. For international professionals, Supersonik offers an opportunity to work on cutting-edge AI agent technology in a research-driven environment, with a Spain-based team contributing to a globally deployed product.

Industry: AI Software
In Spain: Barcelona
Website: supersonik.ai

Good to know if you are moving

Supersonik has a validated office location in Barcelona, Spain, and is hiring for roles there.
The company is an applied research lab focused on AI agents that operate and explain software in real time.
Supersonik reports backing from investors associated with Google DeepMind.
The platform claims over 80,000 customers reached and 500+ system integrations.
The company emphasizes enterprise governance, security, and production readiness in its AI deployments.

All open roles at Supersonik AI