Fullstack Java + React Developer (Java/Spring Boot/React + AI Tooling) - Portuga

ABOUT THE OPPORTUNITY

We are looking for two Full Stack Engineers — one Senior and one Mid-level — to help build, evolve and operate scalable digital products that deliver real value to customers and internal teams. You will work across the full stack, contributing throughout the software development lifecycle: from API design and distributed backend services to modern, accessible web interfaces. This role combines strong hands-on engineering across the Java and JavaScript ecosystems with the practical use of approved AI-assisted development tools as part of a modern engineering workflow. You will own features end to end, in a team where technical decisions are discussed rather than dictated.
PROJECT & CONTEXT

The client is a well-established player in the retail sector, operating large-scale, high-traffic digital platforms where performance, reliability and scale are daily engineering concerns. The ecosystem is built on distributed, containerised services with a modern React/Next.js frontend layer and a mature CI/CD and observability culture. AI tooling is an established part of how the team works — not an experiment — and engineers are expected to use it critically, validating and improving what it produces. You will join a product-oriented team with a stable roadmap and a platform used by a large customer base.
WHAT WE'RE LOOKING FOR (Required)

AI-assisted engineering

- Practical experience using AI tooling to support development activities: code generation and refactoring, test creation and automation, documentation generation, code analysis and review, and technical investigation

- Ability to review, validate and improve AI-generated output to ensure quality, security and maintainability

Backend

- Strong commercial experience developing software with Java (recent versions — Java 17 LTS or above) and Spring Boot 3.x

- Experience building and operating distributed systems, RESTful APIs and microservices

- MySQL 8 — schema design, query optimisation and performance tuning

- AWS — building, deploying and maintaining cloud-native applications

Frontend

- Strong commercial experience with JavaScript and TypeScript

- Experience building modern web applications with React 18

- Strong understanding of web performance, accessibility and responsive design

Engineering practices

- Strong understanding of software engineering best practices, testing, code quality and maintainable code

- Strong understanding of CI/CD practices and modern software delivery approaches

- Experience with containerisation technologies

- Understanding of infrastructure, monitoring and observability practices

- Strong problem-solving skills and the ability to contribute effectively in a collaborative, cross-functional team

- Fluent English, spoken and written (working language of the project)

NICE TO HAVE (Preferred)

- Next.js in production environments

- Kubernetes and container orchestration platforms

- Apache Kafka or other event-streaming technologies

- Modern observability and monitoring tooling

- Experience in large-scale digital, retail or eCommerce environments

- AWS certifications

- Portuguese language skills

Compensation: €2000 – €2600/month net, depending on experience and seniority level.

Why HumanIT people stay (4.4 Glassdoor, 89% recommend)

- 15th month salary

- Health insurance covering your family

- Birthday off

- Mobility program for digital nomads

- Real work-life balance

Originally posted on Himalayas