> Markdown version of [/jobs/ext/2023895-software-engineer](https://www.wearedevelopers.com/jobs/ext/2023895-software-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Software Engineer

- **Company:** Supersonik Supersonik
- **Location:** Barcelona, Spain
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, Software as a Service, Continuous Integration, Distributed Systems, Github, Python (Programming Language), PostgreSQL, Performance Tuning, Redis, Datadog, Real Time Systems, ReactJS, Large Language Models, Prompt Engineering, Fastapi, Event Driven Architecture, Front End Software Development, Virtual Agents, Terraform
- **Published:** August 11, 2026
- **Apply:** https://es.trabajo.org/oferta-4021-4f9e671c120ce8f0c3b79a6510339054

## About the Role

Full ownership, real impact, and fast learning cycles - A tight-knit team that values clarity, speed, and smart execution

## Description

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


## Related Videos

- [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook)
- [Intro to FastAPI](https://www.wearedevelopers.com/videos/462-intro-to-fastapi)
- [Innovating Developer Tools with AI: Insights from GitHub Next](https://www.wearedevelopers.com/videos/1268-innovating-developer-tools-with-ai-insights-from-github-next)
- [Reducing LLM Calls with Vector Search Patterns - Raphael De Lio (Redis)](https://www.wearedevelopers.com/videos/1714-reducing-llm-calls-with-vector-search-patterns-raphael-de-lio-redis)
- [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling)
- [Building and Deploying Multi-Agent Systems with ADK and Vertex AI](https://www.wearedevelopers.com/videos/1918-building-and-deploying-multi-agent-systems-with-adk-and-vertex-ai)

## Related Articles

- [Dev Digest 120 - Apple and peers](https://www.wearedevelopers.com/magazine/455-dev-digest-120-apple-and-peers)
- [Dev Digest 131 - AI'm not sure about OSS](https://www.wearedevelopers.com/magazine/472-dev-digest-131-ai-m-not-sure-about-oss)
- [Navigating the AI Shift](https://www.wearedevelopers.com/magazine/629-navigating-the-ai-shift)
- [Dev Digest 121 - AI goes offline](https://www.wearedevelopers.com/magazine/456-dev-digest-121-ai-goes-offline)
- [Dev Digest 137 - AI'm not sure about this](https://www.wearedevelopers.com/magazine/485-dev-digest-137-ai-m-not-sure-about-this)
- [The Best X (Twitter) Accounts for Developers](https://www.wearedevelopers.com/magazine/294-the-best-x-twitter-accounts-for-developers)