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Freelance Kotlin Developer Spain
Job Location:
Salary:
Experience Required:
Posted:
24 May 2026 (30+ days ago)
Posted:
Application Deadline:
21 August 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Job Summary
This is a remote position.
Blue Code Alicante is looking for a Freelance Kotlin Developer (remote from Spain is a must) to join a high-ownership engineering team building and evolving a distributed microservices backend on AWS. Youll work across a complex domain that includes route optimization schedule ingestion geo-routing and carrier data all at real scale. Youll take full ownership of services from design to production drive architectural decisions and proactively identify and fix problems before they become incidents.
Responsibilities:
- Design build and maintain JVM-based microservices (Java / Kotlin) running on AWS ECS App Runner and Lambda
- Work with a rich data layer: PostgreSQL DynamoDB RedShift Redis and S3
- Build event-driven integrations via RabbitMQ and SNS
- Collaborate on API design across REST (API Gateway) and BFF patterns
- Instrument services with OpenTelemetry Tempo Prometheus and Grafana
- Ship via GitHub Actions CI/CD pipelines with Docker and ECR
- Work with external integrations including Auth0 GraphHopper PostHog and Sentry
- Participate in architecture decisions and technical direction
Requirements
- Minimum 6 years of professional backend development in Kotlin / Java
- Solid understanding of distributed systems design microservice patterns and event-driven architecture
- Hands-on production experience with AWS (ECS Lambda S3 RDS or DynamoDB)
- Experience with relational databases (PostgreSQL) and NoSQL (DynamoDB or similar)
- Strong command of Docker and containerized deployments
- Experience with CI/CD pipelines (we use GitHub Actions)
- Clean code as a practice
- Registered as a freelance in Spain is a must
Nice to have (but not required):
- Experience with message brokers (RabbitMQ SQS/SNS)
- Familiarity with observability tooling (OpenTelemetry Prometheus/Grafana stacks)
- Background in logistics routing geospatial or supply chain domains
- Experience integrating third-party APIs (auth providers mapping/routing engines analytics)
Benefits
- Competitive daily or hourly rate negotiable based on experience / skills
- International and dynamic work setting
- Remote work model from Spain
- Freelance / Contract B2B basis
Required Skills:
- Minimum 6 years of professional backend development in Kotlin / Java - Solid understanding of distributed systems design microservice patterns and event-driven architecture - Hands-on production experience with AWS (ECS Lambda S3 RDS or DynamoDB) - Experience with relational databases (PostgreSQL) and NoSQL (DynamoDB or similar) - Strong command of Docker and containerized deployments - Experience with CI/CD pipelines (we use GitHub Actions) - Clean code as a practice - Registered as a freelance in Spain is a must
Required Education:
Bachelors Degree or Master
