Java Backend Developer

We are looking for a Senior Java Backend Developer to contribute to high-criticality digital platforms in the financial services and payments sector. This opportunity focuses on cloud-oriented backend development, resilient distributed systems, secure APIs and performance optimization in environments with demanding availability, latency and transaction volume requirements.

WHAT YOU WILL DO

Develop and maintain backend services, APIs and business logic using Java and Spring Boot, following modern software engineering practices.

Design and evolve microservices aligned with cloud native and cloud agnostic principles, with attention to scalability, resilience and maintainability.

Write unit, integration and contract tests, and support QA teams in test automation activities.

Participate in technical solution design with architecture teams, ensuring alignment with defined architectural principles.

Collaborate with architecture, QA, SRE, security and business stakeholders during refinement, planning and code review activities.

Build secure and observable software from the start, including structured logging, tracing, metrics and operational readiness.

Contribute to technical documentation for services, APIs and relevant design decisions.

Analyze incidents and technical issues in development, QA and certification environments, including third-line support for problem analysis and resolution.

WHAT WE ARE LOOKING FOR

Senior experience in Java backend development, with solid understanding of concurrency, memory management and enterprise application design.

Strong ability to work with distributed systems, microservices and APIs in high-criticality environments.

Quality-oriented mindset, with attention to secure development, testing, observability and technical rigor.

Collaborative approach, with openness to constructive feedback and active knowledge sharing within multidisciplinary teams.

Solution-oriented attitude and willingness to learn, adapt and contribute to modern software architectures.

TECHNICAL SKILLS

Java

Spring Boot

Spring ecosystem

Spring Cloud

Microservices architecture

REST APIs

Distributed systems

Synchronous and asynchronous communication patterns

Fault-tolerant design, including retries, circuit breakers, fallbacks and idempotency

Relational databases

NoSQL databases

Geo-distributed database concepts

Git

CI/CD

DevSecOps practices

Code review practices

Unit, integration and contract testing

JUnit

Mockito

Testcontainers

Logging, metrics and distributed tracing

NICE TO HAVE

Docker or Podman

Kubernetes

12-factor application principles

Cloud native development

High-throughput and low-latency systems

Event-driven architecture

NewSQL databases

MongoDB

CockroachDB

Legacy-to-cloud modernization projects

Centralized logging and observability platforms

SRE practices

Payments, instant payments or mission-critical financial systems experience

ISO 20022

SEPA Instant Credit Transfer

WHAT WE OFFER

Private health insurance from day one, with no waiting period and optional family extension.

Confidential mental health support through specialized partner services, including access to content and live sessions from the beginning of your journey.

Continuous development and learning opportunities, supporting structured growth and long-term capability building.

Flexibility whenever the role and delivery context allow it, supporting sustainable performance and daily balance.

Community moments, shared milestones and leadership proximity when it matters most.

Upskilling opportunities in quality management, information security, AI governance and cybersecurity best practices, supporting responsible and secure delivery.

EQUAL OPPORTUNITY

Hexa is committed to equal opportunity and inclusive hiring. We value different backgrounds, perspectives and experiences, and we align our practices with the principles of the Portuguese Diversity Charter.

HEXA LIFE

At Hexa, we are Builders. We work with honesty, mutual support and agility, contributing with responsibility, technical excellence and a continuous improvement mindset. Whether working across teams, clients or geographies, each Builder helps create stronger solutions, trusted relationships and meaningful impact.

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