Founding Full-Stack Ai Native Engineer (€60K-€80K) React/Python - €60.000 - €80.000 A Year

Ai Hiring Startup; Barcelona; Hybrid; EUR 60,000 - 80,000; Full time

Benefits offered by this job

Stock options

Flexible hybrid

Barcelona office

Job summary

Ai Hiring Startup in Barcelona is seeking a motivated Full-Stack Engineer to join as the first hire and help shape a new AI-native platform. You will own features from first commit to production, spanning Next.js frontend, FastAPI backend, and Supabase as needed.

You will work in a hybrid setup with three in-office days in Barcelona, collaborating closely with the founding team to ship fast, automate deployments, and build scalable AI-driven HR tooling.

Qualifications

• 4+ years of professional full-stack software engineering.
• Experience shipping end-to-end features with Next.js and Python/FastAPI.
• Strong knowledge of API design, webhooks, OAuth/JWT, and deployment automation.
• Experience with monorepos and CI/CD.

Responsibilities

• Ship features from first commit to production monitoring.
• Build platform patterns and ensure observability.
• Collaborate with founders on technical decisions while moving fast.
• Own features end-to-end and automate repetitive tasks.

Skills

Full-stack

Next.js

Python

FastAPI

AI agents

CI/CD

Docker

APIs

OAuth/JWT

Observability

Tools

Docker

Job description

SHORT VERSION

¿Está considerando presentar su candidatura para este trabajo? Compruebe todos los detalles en esta descripción del puesto y luego haga clic en "Solicitar".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-€80kHybrid : 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!

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 and, 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)Product : will be extremely simple : only the features that solve the recruiter’s biggest pains.Risks : Like in any startup, they exist, and we’ll explain them during the interview.Founding team : : / / : / / : 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 GoDesign 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 StackDesign 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 & MonitoringSet 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 timeOur stack : Python / FastAPI, Next.Js 14+, Supabase, Docker, GitHub Actions, and infrastructure as code patterns.

You AreMust-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,, 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-€80kOptional 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. xhfqzwm Ship features, build the platform as you go, and help us create a tech organization built on leverage.