Java Back End Engineer

99X Technology; Portugal; Presencial; EUR 40 000 - 55 000; Tempo integral

Resumo da oferta

99X Technology in Lisbon is seeking a Software Engineer to contribute to a data-driven payment optimisation platform. You will work closely with teams across various regions to develop a microservices-based architecture that processes transactions in real-time.

Ideal candidates have strong experience in Java and Spring Boot, as well as skills in cloud platforms and CI/CD practices. Join us to drive engineering excellence and innovation.

Qualificações

• Strong experience with Java and Spring Boot.
• Experience building microservices architectures.
• Experience with RESTful APIs and/or gRPC.
• Familiarity with event-driven systems.
• Experience with cloud platforms and CI/CD pipelines.
• Strong communication skills in English.

Responsabilidades

• Participate in backlog refinement, sprint planning, and technical design discussions.
• Write clean, maintainable, and efficient code following best practices.
• Ensure code quality through testing, code reviews, and continuous integration.
• Build and evolve backend services.
• Design and develop microservices using Java and Spring Boot.

Conhecimentos

Java

Spring Boot

Microservices architectures

RESTful APIs

gRPC

CI/CD pipelines

Event-driven systems

Cloud platforms

Agile environments

English communication

Ferramentas

Apache Kafka

Prometheus

Grafana

Descrição da oferta de emprego

We are looking for a Software Engineer to join our team and help build and scale a high-performance, data-driven payment optimisation platform.

In this role, you will work closely with distributed teams across multiple regions, contributing to the development of a modern microservices-based platform that processes transactions in near real time. You will play a key role in designing, developing, and maintaining robust backend services, while helping to drive engineering excellence and continuous improvement.

Responsibilities

• Participate in backlog refinement, sprint planning, and technical design discussions
• Write clean, maintainable, and efficient code following best practices
• Ensure code quality through testing, code reviews, and continuous integration
• Build and evolve backend services
• Design and develop microservices using Java and Spring Boot
• Develop and maintain REST and gRPC APIs
• Contribute to event-driven architectures using messaging systems
• Collaborate across teams:
  • Work closely with engineers, product owners, and stakeholders across distributed teams
  • Contribute to the delivery of end-to-end features in an agile environment
  • Promote knowledge sharing and engineering best practices
• Ensure scalability and reliability:
  • Build resilient and scalable systems deployed in cloud environments
  • Monitor system performance and troubleshoot production issues
  • Contribute to observability using logs, metrics, and monitoring tools
  • Improve CI/CD pipelines and automation practices
  • Participate in system design discussions and architectural decisions
  • Continuously learn and apply modern engineering practices

Requirements

• Strong experience with Java and Spring Boot
• Experience building microservices architectures
• Experience with RESTful APIs and/or gRPC
• Familiarity with event-driven systems (e.g. messaging platforms)
• Experience with cloud platforms and CI/CD pipelines
• Knowledge of monitoring and observability tools
• Experience working in Agile environments (Scrum/Kanban)
• Strong problem-solving and analytical skills
• Ability to work effectively in distributed teams
• Strong communication skills in English (written and spoken)

Nice-to-Have

• Experience with Apache Kafka or similar messaging systems
• Familiarity with cloud platforms such as PCF or Kubernetes
• Experience with monitoring tools (e.g. Prometheus, Grafana)
• Understanding of payment systems or high-volume transaction platforms
• Experience with automated testing frameworks
• Strong interest in performance optimisation and scalability
• Experience contributing to platform-level or data-driven systems

If this sounds like you, share your CV with us and let’s talk!