Senior Fullstack Engineer – Applied AI

Ersilia; Barcelona; Híbrido; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A forward-thinking recruitment tech firm in Barcelona is looking for a Senior Fullstack Engineer to build and enhance features that leverage AI in recruiting. Responsibilities include collaborating with product teams and maintaining code quality. The ideal candidate thrives in fast-paced environments and has a strong fluency in TypeScript and modern stacks. The company offers a hybrid working model, with two office days per week.

Servicios

Autonomy in decision-making

Hybrid work model

Collaborative team environment

Formación

• Experience with modern TypeScript-based stacks.
• Proficiency in frontend and backend technologies.
• Curiosity about applied AI and teamwork focus.

Responsabilidades

• Deliver features end-to-end across frontend and backend.
• Collaborate with product and design during discovery and planning.
• Integrate AI components where valuable.

Conocimientos

React

TypeScript

NestJS

AI Components

Collaboration

Herramientas

PostgreSQL

MariaDB

Docker

AWS

Descripción del empleo

About Workfully

At Workfully, we’re building the first global recruitment marketplace where independent recruiters can grow, engage, and monetize their talent networks — connecting them to meaningful opportunities at innovative companies worldwide.

Our technology is designed to make recruiting more transparent, fair, and scalable. We’re a profitable early-stage company with clients like TravelPerk, OLX, Accenture, Inditex, and FreeNow, and we’re now expanding our engineering team to build the next generation of the Workfully platform.

The Role

We’re looking for a Senior Fullstack Engineer who’s passionate about product, user experience, and applied AI.

You’ll work end-to-end across the stack — from concept and design discussions to production-ready delivery — building features that make our platform smarter and more intuitive. You’ll collaborate with product and design early in the process, experiment with LLMs, embeddings, and semantic search, and help us bring real AI value into recruiting.

What You’ll Do

• Deliver features end-to-end across frontend and backend
• Collaborate with product and design during discovery and planning
• Integrate AI components (LLMs, embeddings, semantic search) where they add value
• Contribute to architectural discussions and ensure technical scalability
• Maintain high standards of code quality, performance, and testing

Our Stack

We work with a modern TypeScript-based stack:

• Frontend: React, Next.js, TailwindCSS
• Backend: NestJS, Sequelize, MariaDB / PostgreSQL
• Infrastructure: AWS (ECS, EC2, S3, CloudWatch), Docker, Auth0
• Testing & CI/CD: Jest, Testing Library, GitHub Actions
• Principles: SOLID, Domain-Driven Design, Clean / Hexagonal Architecture

Who You Are

• You thrive in fast-moving environments and enjoy building real products
• You’re curious about applied AI and eager to use it beyond experiments
• You’re pragmatic about trade-offs and focused on impact
• You value clean, maintainable code and collaborative teamwork

Why Workfully

We’re a small, product-driven team building technology that changes how recruiting works. You’ll have the autonomy to make decisions, see your impact fast, and work alongside a group of people who care deeply about what they build.

We work hybrid —two days a week from our sea-view office in Barceloneta, the rest wherever you work best.