Founding Full-Stack AI Native Engineer (€60k-€80k) [React/Python]

Hirevoice; Madrid; Híbrido; EUR 60.000 - 80.000; Jornada completa

Descripción de la vacante

An innovative AI hiring startup in Madrid is seeking a Full-Stack Engineer. As the first engineering hire beyond the founders, you will own features from the first commit to production monitoring and help shape product development. The ideal candidate has over 4 years of software engineering experience, proven ability in full-stack development, and a strong passion for AI technology. Salary ranges from €60k to €80k, with a flexible hybrid work model requiring presence in the Barcelona office three days a week.

Servicios

Optional Stock Options Plan

Private penthouse office

Zero micromanagement and politics

Formación

• 4+ years of professional software engineering experience.
• Ability to ship features end-to-end with Next.js and Python/FastAPI.
• Experience with deployment automation, CI/CD, and Docker.
• Strong knowledge of API, webhook, and authentication patterns.

Responsabilidades

• Own features from first commit to production monitoring.
• Design API patterns for integration with HR tech stack.
• Set up monitoring and automation for deployments.
• Collaborate with founders on technical decisions.

Conocimientos

Software Engineering

Feature Shipping

AI Agents

API Development

Deployment Automation

Collaboration

System Thinking

Herramientas

Next.js

Python

FastAPI

Docker

GitHub Actions

Descripción del empleo

SHORT VERSION

We're building an AI-native platform with autonomous agents, smart workflows, and real-time voice interactions. Looking for a Full-Stack Engineer.

Salary: €60k-€80k

Hybrid: BCN 3 Days, Remote: 2 Days.

Don’t apply if you’re not from Barcelona.

Team: of 3 co-founders now. 6 by the end of the year.

You will be our 1st employee!

Feel free to send me a direct message and tell me whatever you’d like.

LONG VERSION

Key Information

Who are we?

We're a SaaS AI hiring startup, founded in October 2025.

What are we aiming for?

To offer a simple, unique, and differentiated solution that addresses some of the recruiter’s most painful problems.

What drives / obsesses us?

One of the founders has +20 years of recruiting experience, founded Infojobs.net and Hireflix.com, and has tested every ATS on the market — he’ll be a heavy daily user.

Product

AI Interviews / Agents + Omnichannel / All-In-One : WhatsApp + LinkedIn + Email. We’ll be the first to launch something key in the fast detection of talent.

Market

Primarily the US, but global from day one.

Customers

ICP : We are going Enterprise & Mid market (High Volume Recruiting)

Risks

Like in any startup, they exist, and we’ll explain them during the interview.

Founding team

https : // www.linkedin.com / in / alvaromonterrubio /

https : // www.linkedin.com / in / ditorodev

https : // www.linkedin.com / in / nachog /

Funding

Well-funded with 2 years of runway. Investors : +10 successful entrepreneurs with exits in their projects.

Goal 2026

full focus on acquiring customers.

Tech & Challenges

You'll own features from the first commit to production monitoring. We ship fast, identify what's imperfect, and build systems as friction emerges.

1. Ship Features Fast, Build Platform as You Go

Design and ship end-to-end features (Next.js frontend → FastAPI backend → Supabase)

Identify when manual deploys / testing / monitoring hurt, automate them.

Create reusable patterns for common integration needs (data-access, webhooks, auth, data sync)

You'll ship the feature this week, automate the deployment next week, extract patterns the month after.

2. Integration Architecture for HR Tech Stack

Design API patterns that work for ATS, HRIS,, LinkedIn, email providers, and future integrations.

Build webhook handlers, auth flows (OAuth, JWT), data sync pipelines.

Make integrations testable, observable, and resilient from day one. Monitoring and self-healing is critical.

Think about how to "eat" external providers when appropriate.

3. Safe Deployment & Monitoring

Set up monitoring / tracing for every feature you ship (know what breaks and where)

Create deployment automation as manual deployment pain increases.

Build internal tooling to make deployments safe, routine, and low-friction.

Know when to ask for help setting up observability, then automate it for next time

Our stack : Python / FastAPI, Next.js 14+, Supabase, Docker, GitHub Actions, and infrastructure as code patterns.

You Are

Must-haves

• 4+ years professional software engineering (full-stack)
• Proven ability to ship features end-to-end (Next.js + Python / FastAPI preferred)
• Experience and excitement towards AI Agents (coding agents, LLM APIs)
• Experience with monorepos, deployment automation, CI / CD, Docker.
• Strong API, webhook, and authentication pattern knowledge (OAuth, JWT)
• Balance pragmatism and perfection - ship fast, know what's imperfect, fix systematically.
• AI / LLM proficiency is required : You are a heavy user of AI coding agents (Claude, Cursor, GitHub Copilot, or similar) and LLMs in your daily workflow. AI-assisted development is not optional - it will be expected and enforced.

Ownership mindset

You own features from first commit to production monitoring.

You automate when manual work becomes painful, not before.

You ask for help setting up observability when needed, then automate it.

You identify where things need monitoring and either set it up or elevate appropriately.

We test for :

Can you ship a feature AND identify where it needs monitoring?

When you encounter friction (deploys, testing, integration), do you automate or accept it?

Can you collaborate with founders on technical decisions while still moving fast?

Do you think in systems - how does this feature connect to everything else?

Nice to Have

• Prior experience at pre-Series A startups ( HR / ATS integration experience (merge.dev, apideck.com, manatal, Greenhouse, Lever, etc.)
• AI / ML integration patterns (LLM agents, voice tech)
• Platform engineering or internal tooling experience.
• Experience building developer tools or documentation systems.

We Offer

Salary : €60k-€80k

Optional Stock Options Plan (we’ll explain them during the interview)

Impact

First engineering hire beyond founders - define how we build software, set patterns, shape culture.

Work model

Barcelona, Flexible Hybrid. 3 days in office with founders preferred. We're not remote-first - physical proximity in early stages creates better products and faster iteration.

Environment

Zero politics, zero micromanagement, near-zero meetings. Private penthouse office (not co-working), focused work environment.

The role

You’ll be the multiplier that makes our entire team faster. Ship features, build the platform as you go, and help us create a tech organization built on leverage.