Java Developer - 2026-NRE-0240

Lisbon, Portugal

Senior (4-6 Years)

Hybrid

English Required Portuguese Required Not Accepting Candidates Living Abroad

Java Developer (Spring Boot)

About the role

Payments and financial technology company operating across Portugal. The project involves building and evolving microservices and APIs for a large-scale, mission-critical platform, with a strong focus on cloud-native design, resilience, and performance. The team works closely with architecture, QA, SRE, security, and business stakeholders in an environment demanding high reliability and low latency.

What you will do

Develop and maintain microservices, APIs and business logic in Java with Spring Boot, following modern development best practices.
Design and implement solutions oriented towards cloud-native and cloud-agnostic technologies, with continuous focus on performance and resilience.
Write unit, integration and contract tests, and support the QA team in test automation.
Participate in technical solution design together with architects, aligned with the defined architecture.
Collaborate with cross-functional teams (architecture, QA, SRE, security, business) in refinements, planning sessions and code reviews, ensuring secure and observable code (logs, tracing, metrics).
Contribute to technical documentation, including services, APIs and key technical decisions.
Analyze incidents and problems in development and QA/certification environments, acting as third-line support for issue resolution.

Location and work model

Hybrid (3 days/week in the office, Lisboa)
No relocation package available

What are we looking for?

Java
Spring Boot
Understanding of distributed architecture and communication patterns (synchronous vs asynchronous), REST APIs, and failure handling (retries, circuit breakers, fallbacks, idempotency)
Knowledge of relational and/or NoSQL and/or geo-distributed databases
Experience with modern development practices (Git, CI/CD, DevSecOps, code review practices, testing with tools such as JUnit, Mockito, Testcontainers)
English A2
Portuguese

Nice to have

Experience with cloud-native environments (containers, Docker/Podman, Kubernetes, 12-factor apps) and high-throughput, low-latency systems
Knowledge of distributed and event-driven architectures
Knowledge of geo-distributed, NoSQL and NewSQL databases (MongoDB, CockroachDB, etc.)
Experience with legacy-to-cloud-native migration projects
Experience with observability practices (centralized logging, metrics, distributed tracing)
Previous experience in payments, instant payments, or mission-critical financial systems

About Kwan

At KWAN, your career is bigger than one project. You join a real team, on a long-term project, at a company where technology is the business. And when you are ready for something new — a new stack, a new industry, a bigger role — we find that next step with you, without you having to start over somewhere else.

From day one you have a dedicated People Experience Partner: one person accountable for your growth, not your allocation. They know where you want to go, and they help you get there.

You keep learning as technology moves (AI included). Your impact is seen and recognised. Pay and expectations are talked about openly. And you work remote-first, with hubs in Lisbon and Porto for when you want people around.

Grow with clarity. Be treated with respect. Build things that matter.

Apply — if your profile is a match for this role, you will hear from our Talent team within 48 hours. If it is not the right match this time, we will reach out as soon as we find a role that fits you better.

We connect IT professionals with projects that match their skills, professional experience, and goals, then we offer a career progression program, delivered by in-house specialists - our People Experience Partners - to guide them through our journey with us.

What we offer:

A project that matches your skills and ambitions, as well as your preferences for working policies and culture.
A competitive salary with awesome benefits and opportunities to leverage your knowledge and network to earn additional income.
An empowering and respectful work culture enriched with social and learning events.
A People Experience Partner specially assigned to you - your go-to career guide, responsible for supporting your growth, facilitating training, and ensuring your work-life balance at KWAN.

At KWAN, they make sure that I feel comfortable with the client I’m working for and that what I’m doing aligns with my career aspirations.

Luis Caldeira, DevOps @ KWAN

At KWAN, I’m given the space to be myself and do what I love. I have control over the projects I work on, as well as the direction of my career.

Pedro Fonseca, Front End Developer @ KWAN

I see my People Experience Partner as someone who is always available to provide me with motivation and constant feedback, which helps me be sure that I am in the right place.

Josimar dos Reis, Software Developer @ KWAN

I know that I’ve contributed to the growth of a company that truly values a “people first culture”, because my ideas, experiences, and individuality were always appreciated.

João Nascimento, Software Developer (KWAN Alumni)

My two years at KWAN were an incredible experience! From the start, I was welcomed into a warm and collaborative environment where I felt truly supported.

Laís Ortiz, Software Developer @ (KWAN Alumni)

Grab this opportunity, apply now!