About the job Lead Scala & Java Developer (Hybrid)
Client Introduction:
The company is a multinational Sweden SAAS product-based firm.
Company Strength: 100+
Job Description:
We are looking for Lead Scala & Java Developer
Job requirements:
- Develop, maintain, and optimize backend services using Scala (Cats, Cats Effect) and Java (8 & 17).
- Leverage the Cats library and other functional programming tools to build composable and effectful applications.
- Implement and maintain purely functional, type-safe, and concurrent systems.
- Work with Java 8 & 17 features like Streams, CompletableFuture, Records, Sealed Classes, and Virtual Threads.
- Design scalable, resilient, and event-driven microservices using both Scala and Java.
- Develop RESTful and gRPC-based microservices with efficient inter-service communication.
- Implement API gateways, service discovery, and circuit breakers for robust microservice architectures.
- Ensure scalability and fault tolerance using event-driven architectures (Kafka, Pulsar, RabbitMQ, etc.).
- Optimize service performance through profiling, monitoring, and observability tools (Prometheus, Grafana, ELK, etc.).
- Write clean, maintainable, and testable code with a focus on immutability and referential transparency.
- Collaborate with cross-functional teams, including frontend, DevOps, and QA, to deliver high-quality solutions.
- Continuously improve code quality and system performance through profiling, benchmarking, and testing.
- Follow best practices for functional programming, including monads, type classes, and category theory concepts where applicable.
- Participate in code reviews, mentoring, and knowledge-sharing sessions.
Required Skills & Experience:
- Excellent knowledge of microservices architecture and best practices.
- Strong proficiency in Scala and functional programming paradigms.
- Hands-on experience with Cats, Cats Effect, and functional libraries like FS2, ZIO (optional), or Doobie.
- Good understanding of monads, functors, type classes, and algebraic data types (ADTs).
- Solid experience in Java 8 & 17, including Streams, Completable Future, and new language features.
- Experience building and maintaining high-concurrency, distributed systems.
- Knowledge of asynchronous and reactive programming principles in both Scala and Java.
- Familiarity with frameworks like http4s, Akka, Akka HTTP, Play Framework (Scala) and Spring Boot, Micronaut, Quarkus (Java).
- Experience working with databases (SQL and NoSQL) and data streaming technologies (Kafka, Pulsar, etc.).
- Strong knowledge of testing strategies (ScalaTest, MUnit, JUnit, TestContainers, property-based testing).
- Understanding of cloud-based architectures and containerization (AWS, Kubernetes, Docker).
- Strong knowledge of CI/CD pipelines, DevOps, and Infrastructure as Code (Terraform, Helm, Ansible).
Nice to Have:
- Knowledge of ZIO and other FP-based libraries.
- Experience with GraphQL and gRPC.
- Open-source contributions or blogs on Scala/functional programming.
Other Details:
Work Mode: Hybrid
Location: Amsterdam, Netherlands
Nature of Employment: 6 months contract
Working Timings: 9 am-5 pm
Working Days: Monday - Friday
Experience: 5+ years
About HR Ways:
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