Senior Fullstack Developer

K-Lagan; Barcelona; Híbrido; EUR 65.000 - 90.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Hybrid work model

Birthday day off

Private health insurance

Flexible compensation plan

Gym discounts

Volunteer day

Descripción de la vacante

K-LAGAN in Barcelona is seeking a Senior Fullstack Developer to join our Software Engineering team. You will build end-to-end applications, develop interactive React interfaces, and robust Java backend services in a cloud environment.

You should have 4+ years of experience with Java/Spring Boot, React, Docker, Kubernetes, CI/CD and Azure, plus strong English communication. We offer a permanent contract with hybrid work, flexible hours, and a culture focused on innovation and sustainability.

Formación

• 4+ years of software development experience with Java and React.
• Degree in Computer Science or equivalent.
• Strong knowledge of Java (Spring Boot), React.js, Docker, Kubernetes, CI/CD, and Azure.
• Fluent English (B2/C1) for international teamwork.
• Familiarity with Agile methodologies, Clean Code, and TDD.

Responsabilidades

• Develop end-to-end applications and robust backend services.
• Lead frontend development with React interfaces and Redux/Context API.
• Manage container lifecycles with Docker and Kubernetes in production.
• Automate deployments via CI/CD pipelines in Azure.
• Optimize performance and security for a reliable user experience.

Conocimientos

Java

React

CI/CD

Agile

TDD

Clean Code

English communication

Educación

Bachelors in CS or related field

Herramientas

Spring Boot

Docker

Kubernetes

Azure Cloud

Descripción del empleo

Senior Fullstack Developer K-LAGAN•Barcelona, barcelonés (comarca); provincia de barcelona; cataluña, Spain

Descripción del trabajo

We are an international technology services company specialized in:

• IT: Banking, Insurance, Retail & E-Commerce, Healthcare
• Transport & Supply Chain: Rail, Automotive, Logistics, and Aerospace
• Manufacturing: Renewable Energy, Oil & Gas, and Utilities
• R&D: Research, innovation, and development of technology solutions

At K-LAGAN, we focus on innovation, real impact, and tailor‑made solutions, supporting our clients in transforming their businesses and processes.

Our purpose is clear: to humanize technology and lead sustainability while acting responsibly toward our people, our clients, and society. We create impact through innovation and talent, contributing to projects that help organizations grow, evolve, and transform.

Our Solutions

We offer a comprehensive technology portfolio including:

• Technical Assistance
• Turnkey Projects
• Managed Services (SLA)
• Custom Technology Products
• Specialized Consulting
• Nearshore / Offshore Projects

We also work in key areas such as Cybersecurity, Data, QA, Agile, AI & Business Transformation, and Green IT.

The Opportunity

We are looking for a Fullstack Developer (Java + React) to join our Software Engineering team and become part of an international, dynamic, and constantly evolving environment. If you are motivated by impactful projects, professional growth, and bringing value through your expertise, this is the place for you.

Your Mission

As a Fullstack Developer, you will build end-to-end applications, leading the development of interactive React interfaces and robust Java backend services, ensuring efficient deployment in cloud environments.

• Develop modern user interfaces and reusable components using React.js and Redux/Context API
• Build scalable APIs with Java and Spring Boot to support frontend functionalities
• Manage container lifecycles using Docker and Kubernetes orchestration in production environments
• Automate deployments through CI/CD pipelines, ensuring continuous delivery in Azure
• Optimize application performance and security to deliver a smooth and secure user experience

Requirements

• Degree in Computer Science, Software Development, or equivalent technical background
• 4+ years of experience in software development with strong expertise in Java and React
• Solid knowledge of Java (Spring Boot), React.js, Docker, Kubernetes, CI/CD, and Azure Cloud services
• Fluent English (B2/C1 level) for communication with international teams
• Familiarity with Agile methodologies and development best practices (Clean Code, TDD)

Nice to Have

• Experience with TypeScript on the frontend
• Azure certifications or knowledge of monitoring tools
• Ability to propose efficient architectural solutions connecting frontend and backend systems

What We Offer

• Stable, innovative, and international projects aligned with your experience
• Permanent contract
• Hybrid work model depending on the project
• Flexible working hours
• 3 C's Recognition Program (Commitment, Communication & Customer Orientation) with financial rewards
• Career development plan and continuous learning opportunities
• Birthday day off
• Private health insurance and flexible compensation plan
• Gym discounts
• Childcare, language learning, and transportation support
• Annual volunteering day
• Events and team buildings: afterworks, tech cafés, dinners, barbecues...
• Summer and Christmas company dinners
• +1 additional vacation day after every 4 years with the company

Our Commitment

At K-LAGAN, we believe in responsible technology (Green IT) and promote social impact initiatives such as our annual volunteering day, creating an environment where people can grow and thrive.