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