Software Engineer, AI, Full-stack

flyboard; Barcelona; Presencial; EUR 70.000 - 110.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Ownership from day one

Budget for AI tools

On-site with occasional WFH

Permanent contract in Spain

Descripción de la vacante

Flyboard.ai in Spain is seeking a Software Engineer for the Core Platform to design, build, and scale the foundation powering our AI voice agents. You will work closely with the founders and a small team to own performance, reliability, and the overall quality of the core platform.

The role emphasizes hands-on engineering and architectural influence. The position offers direct exposure to the technical Cofounder, real ownership from day one, and a path to impact growth in a dynamic, mostly

Formación

• 2–5 years of relevant experience, ownership and technical ability valued over tenure.
• Strong Python and backend engineering skills.
• Experience building, deploying, and operating production software.
• Familiarity with APIs, distributed systems, cloud infrastructure, and observability.
• Ability to investigate technical problems methodically and take ownership in production.
• Comfort working in a fast-moving environment with changing requirements and direct customer impact.
• Practical experience with AI coding tools (Codex, Cursor, Claude Code) is a plus.

Responsabilidades

• Platform Development: design and implement scalable platform features for core voice agent infrastructure.
• API & Integration Ownership: build, maintain, and optimize high-throughput APIs with model providers (OpenAI, Google, ElevenLabs, Anthropic, Amazon).
• System Reliability: optimize performance, latency, and observability under heavy load.
• Developer Tooling: build internal tooling to streamline Operations and Delivery.
• Deployment and Infrastructure: improve CI/CD pipelines and manage cloud infrastructure (AWS, with Azure/GCP exposure).

Conocimientos

Python backend

APIs

Distributed systems

Cloud infrastructure

Observability

CI/CD

Production software

Herramientas

AWS

Azure

GCP

Descripción del empleo

We Make Voice AI Work. We ship production-ready agents that automate real sales and operations.

Flyboard.ai builds and operates custom AI voice agents that automate high-volume, repeatable workflows across commercial and operational processes. Our customers include fast-moving SMEs, corporates, and mid-market leaders across Europe and LatAm. We are execution-obsessed, customer-ROI-driven, and deeply committed to operational excellence.

As a Software Engineer for the Core Platform, you will work closely with the founders and a small engineering team to design, build, and scale the foundational technology that powers our AI voice agents. Your mission is to own the performance, reliability, and technical excellence of our core platform, ensuring seamless integration with the world's leading AI model providers. This role is highly hands‑on, critical to our platform’s scalability, and central to Flyboard’s ability to deliver value at high volume. You will report directly to the Technical Cofounder.

What You Will Do

• Platform Development: Design and implement robust, scalable platform features for our core voice agent infrastructure.


• API & Integration Ownership: Build, maintain, and optimize high-throughput APIs, ensuring reliable integration with core model providers (OpenAI, Google, ElevenLabs, Anthropic, Amazon, etc.).


• System Reliability: Optimize system performance, latency, and observability to ensure the core platform is stable and efficient under heavy load.


• Developer Tooling: Develop and implement internal tooling and automation to streamline the work of our Operations and Delivery teams.


• Deployment and Infrastructure: Improve our continuous integration/continuous deployment (CI/CD) pipelines and contribute to maintaining our cloud infrastructure (primarily AWS, with exposure to Azure and GCP).

We are looking for someone driven, analytical, structured, and hungry to grow.

What you need:

• Typically 2–5 years of relevant experience, although we care more about demonstrated ownership and technical ability than time in role.


• Strong Python and backend engineering skills.


• Experience building, deploying, and operating production software.


• Familiarity with APIs, distributed systems, cloud infrastructure, and observability.


• The ability to investigate technical problems methodically and take ownership through production.


• Comfort working in a fast-moving environment with changing requirements and direct customer impact.


• Practical experience using AI coding tools such as Codex, Cursor, or Claude Code.

Nice to have:

• Experience with voice AI, conversational agents, real-time audio, or telephony systems.


• Experience integrating LLM, speech-to-text, or text-to-speech providers.


• AWS and CI/CD experience.


• Familiarity with model evaluation, prompting, tool use, or fine-tuning.


• Strong product judgment and attention to user experience.

Why This Role Matters

This role sits at the technical core of Flyboard’s product. Your work directly impacts the speed, quality, and scalability of every AI agent we put into production. You will learn how to operate and scale cutting‑edge AI systems, work closely with engineers and founders, and become a key contributor to our rapid growth.

What We Offer

• A steep learning curve with direct exposure to founders and the initial team of a startup


• Real ownership from day one, with impact visible immediately in customer outcomes


• Generous budget for AI coding tools


• Technical ownership with architectural influence


• Exposure to problems that are challenging, not just operationally busy


• A dynamic, execution-driven environment with rapid iteration cycles


• Mostly on‑site, with flexibility to WFH sporadically when needed


• Permanent, full‑time employment contract in Spain

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