Freelance Full Stack Engineer (Java, Spring Boot, React) | 6-Month Contract | Amsterdam Hybrid

NTT DATA Europe & Latam; Amsterdam; Hybrid; EUR 83,000 - 124,000; Full time

Job summary

NTT DATA is seeking a freelance Full Stack Engineer (Java + React) for an international client project based in Amsterdam. This is a 6-month contract with a possible extension and a hybrid work setup. Start date ASAP.

Share responsibility for backend services with Java and Spring Boot, develop frontend with React.js, design APIs and microservices, and help deploy and monitor solutions. Collaborate with Product, Engineering and Architecture teams in an Agile environment.

Qualifications

• Proficient in Java and Spring Boot.
• Experience with microservices and distributed systems.
• Experience building customer-facing applications.
• Familiar with SQL and NoSQL databases.
• Understanding of scalable architectures.
• Experience working in Agile environments.

Responsibilities

• Build and maintain scalable backend services using Java and Spring Boot.
• Develop modern frontend applications using React.js.
• Design and build APIs and microservices.
• Contribute to customer-facing features and platform improvements.
• Collaborate with Product, Engineering, and Architecture teams.
• Write clean, tested code and participate in design discussions.
• Support deployments, monitoring, and production operations.

Skills

Java

Spring Boot

React.js

Microservices

SQL/NoSQL

Agile

Cloud (AWS)

Docker

Tools

Docker

AWS

Kafka

Job description

NTT DATA is looking for a freelance Full Stack Engineer (Java + React) for an international client in Amsterdam.

• Amsterdam, Netherlands (Hybrid)
• 6-Month Contract (Extension Possible)
• Start Date: ASAP

About the Opportunity

We're looking for experienced Full Stack Engineers to join a large-scale technology program for a leading digital business. This is a freelance contract opportunity where you'll contribute to customer-facing products used by a large international user base.

You'll work in modern engineering teams building scalable applications using Java, Spring Boot, microservices, cloud technologies, and React on the frontend. While this is a Full Stack role, strong backend engineering capabilities are essential.

Your role:

• Build and maintain scalable backend services using Java and Spring Boot
• Develop modern frontend applications using React.js
• Design and build APIs and microservices
• Contribute to customer-facing features and platform improvements
• Collaborate with Product, Engineering, and Architecture teams
• Write clean, maintainable, and well-tested code
• Participate in design discussions and technical decision-making
• Support deployments, monitoring, and production operations
• Contribute to continuous delivery and engineering best practices

Required Skills

• Strong experience with Java and Spring Boot
• Experience building microservices and distributed systems
• Experience building customer-facing applications
• Experience with SQL and/or NoSQL databases
• Understanding of scalable architectures
• Experience working in Agile environments
• Ability to demonstrate measurable project impact

Nice to Have

• Kafka or event-driven architectures
• AWS
• Docker
• Experience supporting high-traffic applications
• FinTech, Payments, Banking, or regulated industry experience

What We're Looking For

We value engineers who can clearly demonstrate:

Ownership of features from design through production

Experience building scalable customer-facing platforms