Senior Kotlin Backend Engineer for AI-Driven Fintech

N-iX; Union (NJ); On-site; USD 130,000 - 190,000; Full time

Job summary

N-iX is seeking a Senior Data Backend Engineer (Kotlin) to join a new engagement with a leading European fintech company. You will design scalable backend services in Kotlin and own API layers for internal and customer-facing products.

You will work at the intersection of backend engineering and data platforms, integrating analytical data and building solutions with BigQuery and OLAP layers, in an agile team environment.

Qualifications

• Kotlin experience in production environments.
• BigQuery in production environments.
• Experience with OLAP serving layers and analytical queries.
• Strong background in backend architecture and API design.
• Strong understanding of modern software engineering best practices.
• Professional level of English.
• Currently based in the European Union.

Responsibilities

• Design and develop scalable backend services using Kotlin.
• Build and own clean API layers serving both internal and customer-facing products.
• Work at the intersection of backend engineering and data platforms, integrating analytical data into product experiences.
• Develop solutions leveraging BigQuery and OLAP serving layers.
• Collaborate closely with cross-functional engineering teams in an agile environment.
• Apply AI-assisted development practices using modern engineering tools.
• Contribute to high-quality, maintainable, and scalable software architecture.

Skills

Kotlin

Backend API design

English proficiency

EU-based

Tools

BigQuery

OLAP

REST

gRPC

Job description

N-iX is seeking a Senior Data Backend Engineer (Kotlin) to join a new engagement with a leading European fintech company. You will design scalable backend services in Kotlin and own API layers for internal and customer-facing products.

You will work at the intersection of backend engineering and data platforms, integrating analytical data and building solutions with BigQuery and OLAP layers, in an agile team environment.