Senior Backend Engineer: Scalable Systems & Fraud

Incode; España; On-site; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Flexible Working Hours

Open Vacation Policy

Job summary

Incode is seeking a backend engineer to design and implement scalable backend services powering millions of users. You will work across API design, data migrations, and fraud-detection‑oriented features, ensuring performance and reliability.

You'll collaborate with DevOps, ML engineers, and product teams, applying robust engineering practices, code quality, and observability to deliver high-quality, maintainable systems.

Qualifications

• 5+ years of professional software development experience.
• Proficiency in Java/Kotlin and the Spring framework ecosystem.
• Experience with observability tools (logging, monitoring, tracing).
• Solid understanding of PostgreSQL, MongoDB, and Redis.
• Hands-on experience in domain modeling and REST API design.
• Track record of delivering scalable and maintainable systems.

Responsibilities

• Architect and implement backend systems that are robust, scalable, and capable of supporting millions of active users.
• Build and maintain services from initial model design to production support across prototyping, implementation, testing, deployment, and monitoring.
• Write clean, maintainable, and well-tested code and participate in code reviews.
• Tackle complex problems such as large-scale graph-based systems and massive data migrations.
• Implement logging, monitoring, and tracing to ensure system health and performance.
• Collaborate with DevOps, ML engineers, product managers, and other engineers to ensure smooth integrations and high-quality deliverables.

Skills

Java/Kotlin

Spring framework

Observability tools

PostgreSQL

MongoDB

Redis

REST APIs

Graph databases

Kubernetes

Kafka

AWS

Tools

Kubernetes

Kafka

Neo4j

Memgraph

Amazon Neptune

ClickHouse

Apache Cassandra

Job description

Incode is seeking a backend engineer to design and implement scalable backend services powering millions of users. You will work across API design, data migrations, and fraud-detection‑oriented features, ensuring performance and reliability.

You'll collaborate with DevOps, ML engineers, and product teams, applying robust engineering practices, code quality, and observability to deliver high-quality, maintainable systems.