Kotlin Engineer

Sytac; Zaandam; On-site; EUR 75,000 - 110,000; Full time

Job summary

Sytac BV is seeking an experienced Backend Kotlin Engineer to strengthen the e-Finance engineering team. You will architect, build, and scale backend services supporting high-volume financial processing in an agile SCRUM environment.

Join a team handling invoicing and settlement platforms, with exposure to REST APIs, Kafka/RabbitMQ, and modern observability. 4+ years of backend experience required.

Qualifications

• 4+ years of professional backend engineering experience with Kotlin/Java, including Spring Boot and event-driven architecture.
• Strong practical knowledge of asynchronous messaging systems and event streaming platforms (Kafka, RabbitMQ, or equivalent).
• Ability to break down complex business requirements into technical designs, user stories, and actionable engineering tasks.
• In-depth understanding of RESTful API design principles and data serialization formats.
• Solid experience with relational and document databases (e.g., PostgreSQL, MongoDB), including query optimization and schema design.
• Hands-on experience with modern observability tooling (metrics, distributed tracing, structured logging, and proactive alerting).

Responsibilities

• Architect, build, and scale resilient backend services that support high-volume financial processing.
• Collaborate within an agile SCRUM team responsible for delivering end-to-end backend solutions.

Skills

Kotlin

Java

Spring Boot

Tools

Kafka

RabbitMQ

RESTful APIs

Job description

For one of our enterprise clients in the e-commerce and retail industry, Sytac is looking for an experienced Backend Kotlin Engineer to strengthen their core e-Finance engineering team. In this role, you will collaborate within an agile SCRUM team responsible for architecting, building, and scaling resilient backend services that support high-volume financial processing.

The team

The e-Finance team is responsible for the in-house end-to-end invoicing and settlement platform that processes millions of digital transactions across the business. The platform ingests completed e-commerce purchase flows, transforms them into compliant financial records, and interfaces with internal enterprise systems (including general ledger, ERP, and central bookkeeping) via high-throughput, event-driven pipelines.

Must have requirements

• 4+ years of professional backend engineering experience with Kotlin / Java, including hands-on mastery of Spring Boot and event-driven architecture patterns.
• Strong practical knowledge of asynchronous messaging systems and event streaming platforms (Kafka, RabbitMQ, or equivalent).
• Proven ability to break down complex business requirements into technical designs, user stories, and actionable engineering tasks.
• In-depth understanding of RESTful API design principles and data serialization formats.
• Solid experience with relational and document databases (e.g., PostgreSQL, MongoDB), including query optimization and schema design.
• Hands-on experience with modern observability tooling (metrics, distributed tracing, structured logging, and proactive alerting).