Backend Developer - Java/Kotlin & Kafka

We are looking for a Backend Developer (Java or Kotlin), to work remotely in Portugal who’s eager to embark on an exciting new opportunity!

Apply here: <endereço ocultado> 

About KWAN
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 is this challenge about: 

• Build and enhance backend services powering APIs, integrations, and internal tools.
• Shape scalable and reliable distributed systems for data-heavy workflows.
• Design and optimise schemas, indexing strategies, and database performance (PostgreSQL, ClickHouse).
• Develop high-throughput ingestion pipelines using Kafka.
• Improve observability tooling: logging, metrics, tracing, and alerting.
• Convert financial workflows into robust, production-ready backend components.
• Participate in architectural decisions for event-driven pipelines, sync/transform logic, and search layers.
• Enable AI-driven features by structuring pipelines for RAG, validation, and evaluation.
• Define guardrails and validation layers for data-writing operations.
• Explore new architectural models (graph DBs) for complex data relationships.

Does it sound exciting? Apply now!  <endereço ocultado> 

What we are looking for

• 5+ years of experience as a backend engineer working with data-intensive or large-scale systems
• Strong SQL knowledge and database design expertise, ideally using PostgreSQL
• Solid programming background in Kotlin or Java; and Kafka.
• Bonus: experience with Python or TypeScript
• Experience creating and maintaining production APIs (REST, gRPC, or similar)
• Comfortable using cloud platforms (AWS, GCP, etc.) and container technologies (Docker, Kubernetes)
• Understanding of ETL processes and pipelines for structured and semi-structured data
• Exposure to AI-related data infrastructure (vector DBs, graph DBs, model-serving frameworks, etc.)
• Familiarity with agent orchestration or AI observability tooling
• Experience designing data pipelines optimised for AI workloads (embeddings, feature stores, validation layers)
• Interest in working in a fast-paced environment where engineering decisions shape the product direction
• Fluent level of English (mandatory);
• Availability to work remotely in Portugal
• Candidates must be residing already in Portugal.

Do you meet most of the position requirements? Then grab this opportunity and apply now! <endereço ocultado> 

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.
•    A relocation package and visa sponsorship for all our international hires.

Some Words From Our Colleagues

“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

Grab this opportunity, apply now!  <endereço ocultado> 

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