Java Software Engineer

Cactus; Sevilla; Híbrido; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

A leading software development company based in Seville is seeking a Software Engineer with strong expertise in Java and an AI mindset. In this role, you'll contribute to developing innovative software solutions for IoT connectivity in cities. Ideal candidates have 5+ years of experience, solid knowledge of Spring, Docker, and good communication in English and Spanish. The company values a hybrid work environment and offers competitive salary and benefits.

Servicios

Competitive salary

Hybrid work model

Learning opportunities

Team events

Formación

• 5+ years of hands-on software development experience.
• Strong experience with Java and Spring is a MUST.
• Good communication skills in English and Spanish is a MUST.
• Experience with monitoring / metrics using Prometheus and dashboards in Grafana.

Responsabilidades

• Contribute to the continuous development of software products.
• Participate across the full development lifecycle: SCRUM ceremonies, backlog refinement.
• Identify bugs and propose effective technical solutions.
• Mentor less experienced developers through code reviews.

Conocimientos

Java

Spring

microservices

Docker

PostgreSQL

Prometheus

Grafana

English communication

Spanish communication

Herramientas

message brokers (MQTT)

JavaScript + React

IoT protocols (LoRaWAN)

Descripción del empleo

Overview

Cactus is a software development company, providing full-cycle services for the European market. More than 170 companies increased business productivity using solutions developed by Cactus’ team. The company has been regularly included in the listings of the best software development companies in Belgium, where we have our HQ, and Europe.

Cactus is ready to expand the team with a

Software Engineer with strong expertise in Java

an AI mindset

at our office in Seville. In this role, you will help to build and evolve some of the software platforms Cactus is engaged to, starting with a platform that enables

IoT connectivity in cities — from device onboarding and data ingestion to monitoring and operations at scale.

What You Will Do

• Contribute to the continuous development of software products with real impact on cities.
• Participate across the full development lifecycle: SCRUM ceremonies, backlog refinement, new features, and maintenance.
• Build solutions that interact with hardware and other subsystems.
• Identify bugs and risks, and propose effective technical solutions.
• Take part in technical discussions to solve complex challenges.
• Support the team and maintain technical documentation.
• Mentor less experienced developers through code reviews and knowledge sharing.

What We Expect

• 5+ years of hands-on software development experience.
• Strong experience with Java and Spring is a MUST.
• Experience or knowledge of message brokers (MQTT).
• Experience with microservices.
• Docker.
• Solid database experience, including PostgreSQL and time-series databases.
• Experience with monitoring / metrics using Prometheus and dashboards in Grafana.
• Good engineering practices: testing, clean code, version control, documentation.
• Interest in IoT connectivity, networking basics, and distributed systems.
• Continuous learning mindset, staying up to date with modern coding practices and actively leveraging AI-assisted tools across different phases of the software development lifecycle, while maintaining strong ownership and code quality.
• Security mindset: you build software with security in mind (secure coding practices, least privilege, safe handling of secrets), proactively identify risks and vulnerabilities, and collaborate to ensure services are robust and compliant.
• Good communication skills in English and Spanish is a MUST.

Nice to Have

• JavaScript + React.
• Familiarity with IoT protocols and ecosystems such as LoRaWAN.
• Knowledge of networking concepts (TCP / IP, routing fundamentals, gateways, firewalls).
• Streaming pipelines, or high-volume telemetry systems.

What We Offer

• We value spontaneous interaction, co-creation, and co-ideation. That’s why we believe in hybrid work, with regular time working together at the office.
• A collaborative environment focused on ownership, growth, and impact.
• An environment to keep the pace on AI assisted tools.
• An open, international team of experts.
• Competitive salary, benefits, and learning opportunities.
• Flexible working hours: you own your work and how you organize it.
• Get-together team events.