Senior Backend Engineer

Klar

Senior Backend Engineer developing core backend services for Klar, a fintech startup. Collaborating within a dynamic environment to support product launches with clean and maintainable code.

Posted 6/8/2026full-timeRemote • 🇵🇹 PortugalSeniorWebsite

Tech Stack

Tools & technologies

ApacheAWSDockerGrafanaJavaKafkaKubernetesPostgresPrometheusSpring BootSpringBootTerraform

About the role

Key responsibilities & impact

Write correct, efficient, clean, robust, and maintainable code (Mostly in Java 21+)
Write unit, integration, and end-to-end tests to prevent current errors or future regressions
Participate in code review to learn from others and to teach them as well
Prototype new technologies and libraries that could save time and effort
Write clear and concise documentation for users of your systems
Identify common problems between multiple systems and develop common solutions via libraries
Create designs for new systems and features of moderate complexity
Make time estimates to implement designs that can aid in future planning
Mentor junior engineers

Requirements

What you’ll need

At least 5 years of experience with several of the following development technologies: Java, SpringBoot, PostgreSQL or other relational databases, Apache Kafka, Docker
At least 5 years of experience with microservice architectures, synchronous REST communication over HTTP, and asynchronous communication over Apache Kafka
Deep understanding of database transactions and locking mechanisms.
Knowledge of algorithms and data structure for distributing loads like sharding, leadership election, and more.
2 years of experience with logging and metrics technologies: Prometheus, Grafana, Kibana (preferred)
1 year of experience with the following infrastructure technologies: AWS, Github Actions, Kubernetes, Istio, Terraform, Terragrunt (preferred)
Spanish language skills (preferred)
Experience with the Fintech domain or high paced startup (preferred)

Benefits

Comp & perks

Competitive salary based on performance and experience
Chance of earning Klar stock options
26 days of paid vacation per year
Computer device
International work environment with amazing and highly skilled people
A world class team that helps you evolve your skills in areas you're interested in
Wellhub subscription to offer mental and physical health

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

Java 21+SpringBootPostgreSQLApache KafkaDockermicroservice architecturesREST communicationdatabase transactionsalgorithmsdata structures

Soft Skills

mentoringcode reviewdocumentationproblem solvingtime estimation