Senior Backend Engineer

Job Description:

Company Description

We Dream. We Do. We Deliver.
At Merkle a dentsu company we power the experience economy. Whether were building the next greatapp running CRM at scale for global brands delivering technology architectures that support millions ofusers or providing world-class data identity and insights solutions its all in the name of craftingexperiences that set brands apart from the competition. Backed by dentsus legacy of innovation andcreativity originating in Japan weve spent over 35 years helping brands build loyalty drive growth andconnect meaningfully with their audiences.
Weve been named a global Leader by top industry analyst firms in categories as wide-ranging as digitaltransformation and commerce experience design engineering and technology integration digitalmarketing data science CRM and loyalty and customer data management.

About the role

We are looking for a Senior Backend Engineer to strengthen the service layer of an e-banking platform. You will design build and operate highly reliable secure microservices written in Kotlin with Spring Boot integrated via Apache Kafka event streams and deployed on Red Hat OpenShift. Kotlin is a core requirement as you will work in close collaboration with the mobile engineering team. This is a hands-on role with broad scope: you will own services end-to-end from API contract design through to production observability influence platform-wide architectural decisions and act as a technical reference for your squad and the wider backend chapter.

Responsibilities:

• Design develop and maintain secure scalable backend services and APIs using Kotlin and Spring Boot.
• Build and operate event-driven integrations via Apache Kafka including producers consumers Kafka Streams and Avro schemas with exactly-once semantics.
• Own data models query optimisation and schema migrations across PostgreSQL and MySQL.
• Integrate services with observability CI/CD and DevOps tooling; support deployment and monitoring on OpenShift/Kubernetes.
• Apply security best practices in the realms of OAuth2/OIDC authentication authorisation and encryption.
• Conduct code reviews uphold engineering standards and mentor junior engineers.
• Produce high-quality technical documentation covering design implementation and API contracts.

Required qualifications:

• 5 years of professional backend engineering experience.
• Proficiency in Kotlin.
• Strong hands-on experience with Spring Boot (Spring MVC Security Data JPA Cloud Actuator).
• Solid Apache Kafka experience including Kafka Streams Schema Registry and exactly-once semantics.
• Proficiency with PostgreSQL and MySQL: data modelling query plans replication and working with connection pools (HikariCP).
• Practical experience with Kubernetes or OpenShift.
• Sound understanding of distributed systems microservices architecture and design patterns.
• Familiarity with OAuth2/OIDC and backend security fundamentals.
• Proficiency with Git and CI/CD practices.
• German B2 primary language for team communication documentation and stakeholder interaction.
• English business proficient used for technical standards and international tooling.

Nice to have:

• Bachelors degree in computer science information technology or equivalent experience.
• Prior experience in regulated industries such as banking or fintech.
• Familiarity with Spring Cloud and distributed tracing tools.
• Experience with database migration tooling such as Flyway or Liquibase.
• French or Italian advantageous given the multilingual nature of the Swiss platform.

Benefits:

These are some of the things we offer:

• 25 days of holidays
• 2 volunteer days for charitable activities
• Mental Health: Benefit from 3 extra wellness days on top of your vacation days and a Mental Health
• First Aider and Employee Assisstance program to support your well-being
• 40-hour week & overtime compensation
• Flexible working hours model (flextime)
• Independent home office management
• State-of-the-art creative office space with ergonomically equipped workstations
• Pet friendly offices
• Full access to Dentsu Academy on-site learning sessions online language courses
• Learning Allowance: Receive 40 additional hours per year for personal and professional developmenton top of statutory educational leave
• Corporate benefits platform
• Referral bonus program
• Workation possibility
• Team events: company parties monthly breakfasts aperos

*At dentsu Diversity Equity and Inclusion (DEI) is central to our vision: To be at the forefront ofpeople-centered transformations that shape society.
We cherish the unique talents and perspectives of all individuals welcoming applicants regardless ofgender gender identity nationality religion ethnicity cultural background sexual orientation agephysical or mental ability. By embracing diverse perspectives we create meaningful change andsustainable growth for our people clients and society. Our hiring decisions are guided by qualificationsand role-specific requirements ensuring a workplace free from discrimination and harassment

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