Senior Kotlin Engineer

Visa Hunt; España; On-site; PHP 6,536,000 - 9,441,000; Full time

Job summary

N-iX is seeking a Senior Back-End Engineer to design, build and operate Kotlin microservices on AWS for a European fintech client. You will work hands-on with distributed systems, PostgreSQL and observability tools to ensure scalable, reliable delivery.

The role emphasizes AI-native delivery practices, sharing patterns beyond the squad and embedding directly into client squads as an IC. Excellent English is required.

Qualifications

• 5+ years of commercial backend engineering.
• Kotlin; scalable microservices on AWS.
• AI-native delivery practices across the CDLC.
• Production experience with distributed systems.
• Relational databases (PostgreSQL).
• Observability tooling (Grafana).
• Excellent English communication skills.

Responsibilities

• Design, build and operate scalable Kotlin microservices on AWS.
• Apply AI-native delivery practices to improve throughput while preserving quality.
• Work with distributed systems, relational databases like PostgreSQL, and observability tooling (Grafana) in production.
• Multiply output and quality within the squad and share patterns across the organisation.
• Embed directly into a client squad as a hands-on Individual Contributor.

Skills

Kotlin

AWS

Backend engineering

Distributed systems

PostgreSQL

Grafana

Observability

English communication

Tools

Grafana

Job description

N-iX is looking for Senior Kotlin Engineer - to join the team

Our client is a fast-growing European fintech company in the business spend management space. Products include smart corporate cards, software for business analytics optimisation, and automated invoice management. Operates primarily in Europe, serving SME and mid-sized business customers in a regulated environment (GDPR). We're looking for a Senior Back-End Engineer to design, build and operate scalable Kotlin microservices on AWS, increasing delivery throughput without compromising quality

Responsibilities:

• Design, build and operate scalable Kotlin microservices on AWS.
• Apply AI-native delivery practices across the CDLC to increase delivery throughput without compromising quality.
• Work with distributed systems, relational databases (e.g. PostgreSQL), and observability tooling (e.g. Grafana) in production.
• Multiply the output and quality of the squad you join, and share patterns/practice beyond your immediate team so adoption compounds across the organisation.
• Embed directly into a client squad as a hands-on Individual Contributor (not a coaching/managerial role).

Requirements:

• 5+ years of commercial backend engineering
• Kotlin; scalable microservices on AWS.
• AI-native delivery practices applied across the CDLC
• Production experience with distributed systems
• Relational databases, e.g. PostgreSQL
• Observability tooling, e.g. Grafana
• Excellent English communication skills