20 publicaciones de empleo destacadas de frontend developer en ct (¡Están contratando!)

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Senior Full Stack AI Native Developer

Leadtech -
Barcelona, Barcelona provincia

Solicitud rápida

Detalles del empleo

Contrato indefinido | Jornada completa

Beneficios

Flexibilidad horaria
Sala de juegos

Cualificaciones

Node.js
React
Google Cloud Platform
Machine learning
JavaScript
PostgreSQL
REST
APIs
Cloud
UI
Inteligencia artificial
Python

Descripción completa del empleo

Leadtech Group builds and scales digital products used by millions of people worldwide. With over 18 years of experience, we bring together multidisciplinary teams to turn ideas into meaningful, high-impact solutions.

Within the group, MAU by Leadtech focuses on subscription-based apps and digital products. It builds on the expertise, technology and product mindset developed at Leadtech, combining proven experience with a strong focus on user value and long-term growth.

Across both brands, we share the same approach: a deep commitment to understanding people and creating experiences that make a difference — for our users and for our teams.

We work as a remote-first, international team, where flexibility and collaboration shape how we build, learn and move forward together. Our environment brings together experienced professionals across product, tech, data and design, all driven by curiosity, ownership and continuous improvement.

If you’re looking to contribute to products with real impact and grow alongside a team that values how things are built as much as what is built, we’d love to meet you.

The role

As part of the Development team as a Full-Stack Developer, you will be instrumental in building and scaling our platforms and products. You will work across our entire A.I technology stack to deliver a seamless and powerful user experience. You will be joining projects with a shipping fast approach and a modern tech stack.

Extensive knowledge of Javascript/Typescript.
Design, implement, and maintain RESTful APIs with NextJS/Express to manage user authentication, data processing, and orchestrate analysis workflows
Model Context Protocol (MCP) Knowledge Agents with Claude SDK: to Build AI agents access to real-time data, APIs, and tools Create AI Agents that can actually take actions, Combine the reasoning power of LLMs with real-world integration
Build AI Agents with LangGraph + LangFuse that can handle multi-step reasoning, Create workflows where AI agents collaborate or hand off tasks to other agents. Maintain conversation state and context across interactions and Handle complex decision trees and conditional logic
Develop and maintain features on both our React frontend and Node.js (NextJS) backend.
Build intuitive user interfaces using TypeScript, Vite, React and our UI component library, enabling users to upload media, manage their analyses, and interact with our web delivered product.
Integrate our platform with various external services like Payment Service Providers and APIs, and handle incoming webhooks for processing asynchronous tasks
Collaborate closely with AI product managers and AI specialists to translate complex requirements into robust, scalable features expressed in AI design prompts.
Contribute to database schema design and write migrations for our PostgreSQL & BigQuery databases.
Knowledge of GCP to Collaborate with the team on application deployment and help maintain our cloud infrastructure on Google Cloud Platform.

Requirements

We are seeking a proactive and skilled developer who is passionate about building modern, data-driven applications.

Extensive experience with the Python framework
Deep API Integration experience with 3rd Party vendors. Being able to work with multiple types of SDK to integrate into our products quickly.
A serious self-learner and someone that adapts to new tools and platforms very quickly and adapts it into their day to day workflow in days.
TypeScript Proficiency: You are highly proficient in TypeScript and its application in both frontend (React) and backend (Node.js) environments.
Frontend Expertise: Strong experience with React and modern state management, including Hooks and the Context API.
Backend Expertise: Solid experience building and consuming REST APIs with Node.js and NextJS or Express.
Database Skills: Experience with like PostgreSQL, and working with an ORM or query builder.
Knowledge of LangGraph, LangChain, LangFuse,
Problem-Solving Mindset: You are a collaborative problem-solver, eager to take on new challenges and contribute to a fast-paced development cycle.
Passion for AI: A genuine passion and awareness for artificial intelligence and a strong desire to build products that leverage its capabilities to solve real-world problems. and bring those new discoveries to our product Portfolio.
Very High Agency: in consultation with a Product Owner and the Engineering Manager, you must work with autonomy with a large degree of freedom to implement the business vision.
Creativity and Proactivity: You have a passion for building great products, are eager to propose new features, and enjoy finding creative solutions to improve the user experience.

Nice to Have:

AI Project Experience: Previous experience working on projects involving AI, machine learning, or interacting with large language models (LLMs).
Familiarity with UI component libraries.
Knowledge of cloud platforms like Google Cloud Platform (GCP).

Benefits

Why You'll Love Working With Us

High-Impact Role: Be a key player in a small, agile team building a greenfield project with the potential to transform an industry.
Modern Technology: Work with a cutting-edge, carefully selected tech stack with a focus on best practices.
Growth & Learning: Gain deep experience in AI-driven applications, cloud-native architecture, and real-time systems.
Stability & Vision: Enjoy the energy of a startup environment backed by the resources and stability of a large, successful company.
Collaborative Culture: We value open communication, teamwork, and a shared passion for building exceptional products.

Growth and career development
- At Leadtech, we prioritize your growth. Enjoy a flexible career path with personalized internal training and an annual budget for external learning opportunities.
Work-Life balance
- Benefit from a flexible schedule with flextime and the option of working full remote or from our Barcelona office. Enjoy free Friday afternoons with a 7-hour workday, plus a 35-hour workweek in July and August so you can savor summer!
Comprehensive benefits
- Competitive salary, full-time permanent contract, and top-tier private health insurance (including dental and psychological services).
- 25 days of vacation plus your birthday off, with flexible vacation options—no blackout days!
Unique Perks
- If you wish to come, in our office in Barcelona you’ll find it complete with free coffee, fresh fruit, snacks, a game room, and a rooftop terrace with stunning Mediterranean views.
- Additional benefits include ticket restaurant and nursery vouchers, paid directly from your gross salary.

Join us in an environment where you’re free to innovate, learn, and grow alongside passionate professionals. At Leadtech, you’ll tackle exciting challenges and be part of a vibrant team dedicated to delivering exceptional user experiences

Sounds good? Apply now! We’re looking forward to getting to know you.

Equal Employment Opportunity Employer:

Leadtech is an Equal Employment Opportunity (EEO) Employer, which means we encourage applications from people with different backgrounds, interests, and personal circumstances. Our team welcomes applicants regardless of their race, gender, age, religion, nationality, sexual orientation, gender identity, gender expressión and/or disabilities. All we need is your high energy, skills, and willingness to be a part of a great project!

Location

You'll have the flexibility to choose whether you'd like to come to the office every day, from time to time, or work fully remote. We want you to find the best combination for you.

If you prefer to be surrounded with amazing people, our exceptional office is in Barcelona’s Blue Building, located right on the city's seafront. Besides our stunning views, you’ll enjoy our office perks such as free fruit, snacks, and coffee and you’ll also be able to take part in our Mario Kart and table tennis competitions.

The personal data you provide will be processed in order to manage your candidacy for the corporate selection processes that fit your profile. If you wish, you can exercise your rights of access, rectification or cancellation by writing to our address (Avenida Litoral, 12-14, 5ta planta. Barcelona. 08005) or to the email address [email protected].

#LeadtechOpportunity #MAU

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