Senior Java + React Full-Stack Developer – Hybrid/Remote

KCS IT; Porto; Hybrid; EUR 48,000 - 65,000; Full time

Job summary

KCS IT in Porto, Portugal, seeks a Senior Full Stack Developer with Java + React to join our hybrid team. You will design and build scalable backend services with Java/Spring and craft rich frontend interfaces using React, JavaScript/TypeScript, HTML and CSS.

Strong REST API experience and MongoDB/Redis knowledge are valued, as well as English proficiency for daily collaboration. We value dedication, transparency and proactivity.

Qualifications

• Minimum of 4 to 5 years of experience in a Full Stack role.
• Strong experience with Java (8+) and Spring / Spring Boot for backend development.
• Hands-on experience with React.js, including components, hooks, state management, and routing.
• Good knowledge of JavaScript / TypeScript, HTML, and CSS.
• Experience with relational (e.g., PostgreSQL, MySQL) and non-relational (e.g., MongoDB, Redis) databases.
• Proven experience building REST APIs and using Git version control.
• Fluent English (spoken and written) – essential for daily collaboration.

Skills

Java

Spring / Spring Boot

React.js

JavaScript/TypeScript

HTML

CSS

REST APIs

Git

Manual testing

English (spoken and written)

French language skills

Tools

Git

Job description

KCS IT in Porto, Portugal, seeks a Senior Full Stack Developer with Java + React to join our hybrid team. You will design and build scalable backend services with Java/Spring and craft rich frontend interfaces using React, JavaScript/TypeScript, HTML and CSS.

Strong REST API experience and MongoDB/Redis knowledge are valued, as well as English proficiency for daily collaboration. We value dedication, transparency and proactivity.