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Description

Software Engineer

Location: Barcelona

Department: Engineering

Location Type: IN_OFFICE

Employment Type: FULL_TIME

🚀 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

Supersonik

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Frequently Asked Questions

We prioritize job seekers as our customers, unlike bigger job sites, by charging a small fee to provide them with curated access to the best companies and up-to-date jobs. This focus allows us to deliver a more personalized and effective job search experience.
We've got over 200,000 jobs from 15,000+ vetted companies. No fake or sleazy jobs here!
We aggregate jobs from 15,000+ companies' career pages, so you can be sure that you're getting the most up-to-date and relevant jobs.
We're the only job board *for* software engineers, *by* software engineers… in case you needed a reminder! We add thousands of new jobs daily and offer powerful search filters just for you. 🛠️
Every single hour! We add 2,000-3,000 new jobs daily, so you'll always have fresh opportunities. 🚀
Typically, job searches take 3-6 months. EchoJobs helps you spend more time applying and less time hunting. 🎯
Check daily! We're always updating with new jobs. Set up job alerts for even quicker access. 📅

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