Senior Fullstack Engineer

Barcelona - Spain

Monthly Salary: Not Disclosed

Posted on: 13 hours ago

Vacancies: 1 Vacancy

Job Summary

How youll have impact

Architect a New Suite: You will be pivotal in building a brand-new product suite that spans multiple internal products and companies tackling challenges in scalability reusability (Monorepo) and multi-tenancy.

Own the Full Vertical: You wont just hand off APIs. Youll design resilient backend services ( and consume them in rich AI-native UIs ( Build AI-Native Experiences: From backend agents using LangChain to streaming generative UIs with the Vercel AI SDK you will bring AI into the core of the user experience.

Drive Engineering Excellence: Your input on architecture is expected. Youll champion Domain-Driven Design (DDD) clean code and performance optimization across the entire stack.

What youll do

Ship end-to-end features using TypeScript ( while maintaining or integrating with services in Kotlin/Java. Craft modern frontends with React Tailwind and Vercel AI SDK managing complex state with TanStack Query and Zustand.

Engineer AI agents and workflows (LangChain MCP) that integrate retrieval memory and tool use.

Own your infrastructure: manage deployments using Terraform (IaC) on AWS/Kubernetes and handle Vercel configurations for the frontend.

Obsess over quality: Maintain high confidence with Playwright (E2E) and Kotest/Jest/Vitest (Unit) and continuously tune performance (latency Core Web Vitals).

Leverage AI tooling (Copilot Cursor Claude) to accelerate development and share workflows with the team.

Qualifications :

6 years building production software.

True Fullstack Fluency: Deep expertise in TypeScript (React/) is a must. Familiarity with Kotlin or Java is highly valued.

Cloud Native: Proven experience running containerized workloads in AWS Kubernetes or serverless environments.

Data Polyglot: Comfortable with both relational and NoSQL databases (MySQL DynamoDB Redis).

Architectural Eye: You understand DDD and distributed systems patterns not just syntax.

Communication: You communicate clearly in Spanish / English and thrive on feedback loops.

Nice-to-have superpowers

Experience scaling Monorepos (Turborepo Nx).

Hands-on with AI coding assistants or agent frameworks (LangChain Autogen).

Experience with GitOps or MLOps pipelines.

Información adicional :

Remote-first culture with flexible schedules and core hours.

Goal-oriented work with an amazing agile cross-functional team.

Learning budget and career plan.

An international and diverse environment where you matter.

Remote Work :

Yes

Employment Type :

Full-time

How youll have impact Architect a New Suite: You will be pivotal in building a brand-new product suite that spans multiple internal products and companies tackling challenges in scalability reusability (Monorepo) and multi-tenancy. Own the Full Vertical: You wont just hand off APIs. Youll design r...