Senior Backend Engineer (Java / Spring Boot)

📍 Hybrid – Porto (3 days office / 2 remote)

💼 Freelance contract – 6 months (3+3) with potential long-term integration

⚡ Start: ASAP

We’re looking for a Senior Backend Engineer to join a fast-growing company in the EV charging industry, helping design and scale the backend systems powering next-generation charging infrastructure.

You will work closely with product and engineering teams to build high-performance and reliable backend services in a modern microservices architecture.

What you’ll be doing

• Design and develop scalable backend microservices using Java and Spring Boot
• Deploy and maintain services in AWS cloud environments
• Work with event-driven systems using Kafka or RabbitMQ
• Contribute to architecture discussions and system improvements
• Ensure reliability, security, and performance of backend systems
• Participate in code reviews and technical decision-making
• Collaborate with cross-functional teams to deliver new features

Tech Stack

Java

Spring Boot

AWS (EC2, S3, Lambda, RDS)

Docker

Kubernetes

Kafka / RabbitMQ

Microservices architecture

Relational & NoSQL databases

React

Requirements

• 4-6+ years of backend development experience
• Strong experience with Java and Spring Boot
• Knowledge of React
• Experience building microservices architectures
• Hands-on experience with AWS
• Experience with Docker and Kubernetes
• Familiarity with messaging systems (Kafka or RabbitMQ)
• Strong problem-solving and communication skills
• Fluent English